CN103466640B - A kind of method reducing the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system - Google Patents
A kind of method reducing the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system Download PDFInfo
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Abstract
The invention discloses a kind of method reducing the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system, comprising: the mass concentration improving reaction water glass; And/or improve the pH value of ageing.Particularly, can by the mass concentration of water glass to be brought up to 20% ~ 35%, the pH value of ageing brings up to 4 ~ 10 to reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system.The method of the invention, not only can significantly reduce white carbon black specific surface area BET, and can realize the accurate control of white carbon black specific surface area BET, meets the demand of association area to the white carbon black compared with low specific surface area.Method of the present invention is simple to operate, is easy to realize, and is applicable to large-scale industrial and produces.
Description
Technical field
The present invention relates to white carbon black preparing technical field, be specifically related to a kind of method reducing the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system.
Background technology
White carbon black is the general name of white powder X-ray amorphous silicic acid and silicate product, mainly refers to precipitated silica, aerosil, superfine silicon dioxide gel and aerogel, also comprises Powdered synthetic aluminium silicate and Calucium Silicate powder etc.White carbon black is porous material, and it forms available SiO
2nH
2o represents, wherein nH
2o exists with the form of surface hydroxyl.White carbon black can be dissolved in caustic alkali and hydrofluoric acid, the acid beyond water insoluble, solvent and hydrofluoric acid, have high temperature resistant, do not fire, tasteless, odorless, good electrical insulating property.White carbon black, as the auxiliary agent of a kind of environmental protection, excellent performance, is mainly used in rubber item (comprising high-temperature silicon disulfide rubber), weaving, papermaking, agricultural chemicals, foodstuff additive field.
White carbon black is divided into precipitated silica and thermal silica substantially by production method.Be the cotton-shaped translucent solid colloidal nanoparticle (particle diameter is less than 100nm) of white-amorphous under thermal silica normality, nontoxic, there is huge specific surface area.Thermal silica is all nano silicon, and product purity can reach 99%, and particle diameter can reach 10 ~ 20nm, but complicated process of preparation, expensive.Precipitated silica is divided into again traditional precipitated silica and special precipitation white carbon black, and the former refers to sulfuric acid, hydrochloric acid, CO
2be the silicon-dioxide that basic raw material is produced with water glass, the latter refers to the silicon-dioxide that special methods such as adopting high-gravity technology, sol-gel method, chemical crystal method, second-crystallized method or reverse micelle microemulsion liquid method is produced.Precipitated silica is mainly used as natural rubber and elastomeric strengthening agent, toothpaste abrasives etc.Thermal silica is mainly used as the strengthening agent of silicon rubber, coating and unsaturated polyester thickening material, and superfine silicon dioxide gel and aerogel are mainly used as Coating Matting agent, thickening material, plastic film open agent etc.
(1) vapor phase process
Be mainly chemical vapour deposition (CAV) method, also known as pyrolysis method, dry method or combustion method.Its raw material is generally silicon tetrachloride, oxygen (or air) and hydrogen, and under high temperature, reaction forms.Reaction formula is:
SiCl
4+2H
2+O
2→SiO
2+4HCl。
(2) precipitator method
The precipitator method are again water glass acidization, adopt water glass solution and acid-respons, obtain white carbon black through precipitation, filtration, washing, drying and calcining.Reaction formula is:
Na
2siO
3+ 2H
+→ white carbon black+2Na
++ H
2o.
The common precipitator method are sulfuric acid precipitation methods, namely use water glass solution and sulphuric acid soln to react and generate white carbon black.Such as Chinese patent CN102092721A discloses a kind of method of preparing nanoscale white carbon black through sulfuric acid precipitation method, take water glass as raw material, utilize sulfuric acid for precipitation agent, by tensio-active agent and dispersion aids regulation and control the hydrolysis rate of silicate and the polymerization degree of silicic acid molecule prepare high-quality nano-scale white carbon black.Chinese patent CN102897773A discloses a kind of preparation method and white carbon black of white carbon black, is also to utilize sulfuric acid for precipitation agent, utilizes water glass for raw material production white carbon black.Chinese patent CN102951649A discloses a kind of preparation method of modified white carbon black, utilizes the reaction of water glass and sulfuric acid to generate white carbon black.
At present, although there are many sulfuric acid precipitation legal systems open for the method for white carbon black, but each important parameter research not in dialogue manufacturing technologies of carbon black, with clear and definite its to product performance, especially the impact of the key property such as specific surface area BET and oil-absorption(number) DBP, these performances directly determine the effect of white carbon black product in different field, therefore furtheing investigate sulfuric acid precipitation legal system significant for the impact of each important parameter on product performance in the production technique of white carbon black, is also the problem that this area needs solution badly.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of method reducing the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system, the method is by realizing the reduction of white carbon black specific surface area BET to the regulation and control of the mass concentration of reaction water glass and/or the pH value of ageing.
For realizing object of the present invention, the present invention by the following technical solutions:
Reduce a method of the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system, comprising: the mass concentration improving reaction water glass; And/or improve the pH value of ageing.
The applicant finds no matter be that the mass concentration of raising reaction water glass or the pH value of raising ageing all can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system through further investigation, therefore the present invention can adopt any one in these two kinds of means, or two kinds of means is combined.
In method provided by the invention, the mass concentration of described water glass is brought up to 20% ~ 35%, such as 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, preferably 22% ~ 32%, more preferably 25% ~ 30%, most preferably 25% ~ 28%.
In method provided by the invention, the pH value of described ageing is brought up to 4 ~ 10, such as 4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10, preferably 5 ~ 9, more preferably 6 ~ 8, most preferably 6 ~ 7.
Method provided by the invention can comprise the following steps:
(1) preparing mass concentration is the water glass solution of 20% ~ 35%;
(2) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8 ~ 11, temperature 80 ~ 98 DEG C of conditions, reaction 60 ~ 150min;
(3) pH of reaction solution is adjusted to 4 ~ 10, under temperature 80 ~ 98 DEG C of conditions, ageing 30 ~ 120min, obtains slip;
(4) pH of described slurry is adjusted to 2 ~ 5, obtains white carbon black finished product through press filtration, pulp and drying.
Preferably, the modulus of water glass is 3.0 ~ 4.0 in described step (1), such as 3.1,3.2,3.3,3.4,3.5,3.6,3.7,3.8,3.9,4.0, preferably 3.2 ~ 3.8, more preferably 3.2 ~ 3.5.
Preferably, described step (1) is specially:
(1a) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(1b) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20 ~ 35%, for subsequent use.
Preferably, the concentration of sulphuric acid soln is 40% ~ 98% in described step (2), such as 40%, 42%, 48%, 50%, 55%, 60%, 70%, 75%, 78%, 80%, 85%, 90%, 95%, 98%, preferably 98%.
Preferably, pH is 9 ~ 11 in described step (2), such as 9.2,9.5,9.8,10,10.2,10.5,10.8,11, preferably 10 ~ 11, more preferably 10.
Preferably, in described step (2), temperature is 85 ~ 96 DEG C, such as 85 DEG C, 86 DEG C, 87 DEG C, 88 DEG C, 89 DEG C, 90 DEG C, 91 DEG C, 92 DEG C, 93 DEG C, 94 DEG C, 95 DEG C, 96 DEG C, preferably 88 ~ 95 DEG C, more preferably 94 DEG C.
Preferably, in described step (2), the time of reaction is 80 ~ 120min, such as 80min, 85min, 90min, 95min, 100min, 105min, 110min, 115min, 120min, preferably 90 ~ 110min, more preferably 95 ~ 105min.
Preferably, in described step (3), the temperature of ageing is 85 ~ 96 DEG C, such as 85 DEG C, 86 DEG C, 87 DEG C, 88 DEG C, 89 DEG C, 90 DEG C, 91 DEG C, 92 DEG C, 93 DEG C, 94 DEG C, 95 DEG C, 96 DEG C, preferably 88 ~ 95 DEG C, more preferably 94 DEG C.
Preferably, in described step (3), the time of ageing is 45 ~ 100min, such as 45min, 50min, 60min, 70min, 75min, 80min, 85min, 90min, 95min, 100min, preferably 60 ~ 90min, more preferably 70 ~ 80min.
Preferably, the pH in described step (4) is 2.2,2.5,2.8,3.2,3.5,3.8,4.2,4.5,4.8,4.9.
Preferably, press filtration is specially in described step (4): carry out press filtration by pressure filter, then wash, and washes away sodium sulfate impurity, obtained filter cake with filtering part water.
Preferably, in described step (4), pulp is specially: in pulp tank, and being stirred by agitator by obtained filter cake becomes flowable slip.
Preferably, in described step (4), drying is specially: in drying tower, carries out drying removing moisture, make white carbon black finished product by the slip of warm air to atomization.
Preferably, described step (1) also comprises: in described water glass solution, add sodium-chlor, fully dissolve.
Further preferably, the content of described sodium-chlor is 0 ~ 300g/L, such as 10g/L, 20g/L, 50g/L, 80g/L, 100g/L, 120g/L, 150g/L, 180g/L, 210g/L, 230g/L, 250g/L, 280g/L, 290g/L, 300g/L, preferably 10 ~ 250g/L, more preferably 50 ~ 200g/L, most preferably 100 ~ 150g/L.
Add electrolyte sodium chloride and nonproductive in necessary key element, whether reality is selected to add as required, and ionogen is not limited to sodium-chlor, can also be Repone K, sodium sulfate etc.
In an optimal technical scheme of the present invention, described method comprises:
A () adds solid water glass and water in dissolution kettle, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
B the described liquid soluble glass dissolved adds water by () in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20 ~ 35%;
C described water glass solution and sulphuric acid soln are mixed in reactor by (), under pH8 ~ 11, temperature 80 ~ 98 DEG C of conditions, and reaction 60 ~ 150min;
D the pH of reaction solution is adjusted to 4 ~ 10 by (), under temperature 80 ~ 98 DEG C of conditions, ageing 30 ~ 120min, obtains slip;
E the pH of described slurry is adjusted to 2 ~ 5 by (); Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product.
In another optimal technical scheme of the present invention, described method comprises:
(a ') adds solid water glass and water in dissolution kettle, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(b ') the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20 ~ 35%, add sodium-chlor simultaneously and fully dissolve, the content to sodium-chlor is 0 ~ 300g/L;
(c ') described water glass solution and sulphuric acid soln are mixed in reactor, under pH8 ~ 11, temperature 80 ~ 98 DEG C of conditions, reaction 60 ~ 150min;
(d ') pH of reaction solution is adjusted to 4 ~ 10, under temperature 80 ~ 98 DEG C of conditions, ageing 30 ~ 120min, obtains slip;
(e ') pH of described slurry is adjusted to 2 ~ 5; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product.
" water glass " and " water glass " reality mentioned herein is the different names of same substance, and can refer to simple such as solid kind material (containing hydrate) according to concrete use scenes, also can refer to the aqueous solution.
Advantageous Effects of the present invention:
The applicant finds through further investigation: the mass concentration improving reaction water glass and/or the pH value improving ageing can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system, clearly illustrates the impact of sulfuric acid precipitation legal system for the mass concentration of water glass in white carbon black technique and these two factor dialogue carbon black specific surface BET of pH value of ageing.Apply method of the present invention, can significantly reduce white carbon black specific surface area BET, and realize the accurate control of white carbon black specific surface area BET, meet the demand of association area to the white carbon black of low specific surface area.Method of the present invention is simple to operate, is easy to realize, and is applicable to large-scale industrial and produces.
Accompanying drawing explanation
Fig. 1 is the technical route figure of sulfuric acid precipitation legal system for white carbon black.
Fig. 2 is the data plot of sodium silicate silicate relative to specific surface area BET and oil-absorption(number) DBP.
Fig. 3 is the data plot of reaction pH relative to specific surface area BET and oil-absorption(number) DBP.
Fig. 4 is the data plot of temperature of reaction relative to specific surface area BET and oil-absorption(number) DBP.
Fig. 5 is that NaCl relative concentration is in the data plot of specific surface area BET and oil-absorption(number) DBP.
Fig. 6 is the data plot of ageing pH relative to specific surface area BET and oil-absorption(number) DBP.
Embodiment
Below in conjunction with embodiment, embodiment of the present invention are described in detail.It will be understood to those of skill in the art that the following examples only for illustration of the present invention, and should not be considered as limiting scope of the present invention.Unreceipted concrete technology or condition person in embodiment, according to the technology described by the document in this area or condition, or carry out according to product description.Agents useful for same or the unreceipted production firm person of instrument, being can by the conventional products of commercial acquisition.The present invention adopts the technical route shown in Fig. 1 to prepare white carbon black.
Embodiment 1 studies the impact of processing parameter on the specific surface area BET of white carbon black and oil-absorption(number) DBP
This experiment adopts L
16(4
5) orthogonal water glass (water glass) concentration, reaction pH, temperature of reaction, sodium chloride concentration and ageing pH five factors of have studied on the impact of the specific surface area BET of white carbon black and oil-absorption(number) DBP, draw detailed conclusion by data analysis.
Specific experiment process is substantially as follows:
(1) configure the sodium silicate solution of 200mL finite concentration (table 1 mesosilicic acid na concn), pour in 500mL there-necked flask, add a certain amount of (in table 1 NaCl concentration) NaCl solid; Diluting concentrated sulfuric acid is become the concentration of 40%.
(2) liquid at the bottom of reaction solution is warming up to certain temperature (in table 1 temperature of reaction), drips sulfuric acid while stirring, regulate reaction solution pH, until there is complete white flock precipitate, control and record in reaction end pH(table 1 to react pH); Again regulate material liquid pH to acid (in table 1 ageing pH), at the temperature disclosed above ageing 60min.
(3) feed liquid is carried out suction filtration, gained wet cake water repetitive scrubbing is to can't check Cl-, and wet cake is directly dried, and then pulverizes and obtains white carbon black product.
(4) adopt the method measurement the specific area BET in HG/T3073-2008, adopt the method in HG/T3072-2008 to measure oil-absorption(number) DBP.
Table 1 orthogonal experiment factor and level
Note:
awater glass (Na
2siO
39H
2o, 0.14 ~ 0.35M).
Orthogonal and result as shown in table 2, carry out the experiment of 16 groups of (numbering 1 ~ 16) Different factor combination altogether, often organize parallel laboratory test three times, the specific surface area BET of the white carbon black that test is obtained and oil-absorption(number) DBP, gets the mean value of three times, is summarized as follows table 2.
Table 2 orthogonal and result
Note:
b1 represents factor A(sodium silicate silicate herein) level (corresponding to table 1) be 1(40g/L), all the other are by that analogy.
The result obtained when result (BET and DBP) shown in table 2 is in each specified level according to each specific factor is averaged, and is summarized in table 3.
Table 3 orthogonal experiment data processing
Note:
cbET herein
1when representing that certain factor is in level 1, the mean value of the experimental result specific surface area BET obtained, 80.25 of the such as most upper left corner represents factor A(sodium silicate silicates) be horizontal 1(40g/L) time, the mean value of four groups of experiment (in table 2 numbering 1 ~ 4) specific surface area BET, all the other are by that analogy.
dbET herein
extreme differencewhen representing that certain factor is in 4 different levelss respectively, the extreme difference of the experimental result specific surface area BET obtained, the extreme difference namely between level, all the other by that analogy.
eoptimum represents the situation that the mean value of the specific surface area BET that certain factor obtains when being in certain level is maximum herein, such as A2 represents factor A(sodium silicate silicate) be in horizontal 2(60g/L) time, the mean value of the specific surface area BET obtained is maximum, and all the other by that analogy.
Map respectively according to the data shown in table 3: factor A(sodium silicate silicate) relative to the data plot (as Fig. 2) of specific surface area BET and oil-absorption(number) DBP; Factor B(reacts pH) relative to the data plot (as Fig. 3) of specific surface area BET and oil-absorption(number) DBP; Factor C(temperature of reaction) relative to the data plot (as Fig. 4) of specific surface area BET and oil-absorption(number) DBP; Factor D(NaCl concentration) relative to the data plot (as Fig. 5) of specific surface area BET and oil-absorption(number) DBP; Factor E(ageing pH) relative to the data plot (as Fig. 6) of specific surface area BET and oil-absorption(number) DBP.
As shown in Figure 2: sodium silicate silicate is when below 60g/L, and BET increases with the increase of sodium silicate silicate, sodium silicate silicate is when more than 60g/L, and BET reduces with the increase of sodium silicate silicate.In actual production, sodium silicate silicate, generally all at more than 60g/L, therefore can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system by the mode improving sodium silicate silicate.
As shown in Figure 3: when reaction pH is more than 7.0, BET reduces with the increase of reaction pH, and in actual production, reaction pH is general more than 7.0, therefore can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system by the mode improving reaction pH.
As shown in Figure 4: when temperature of reaction is more than 70 DEG C, BET reduces with the increase of temperature of reaction, in actual production, temperature of reaction, generally all more than 70 DEG C, therefore can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system by the mode improving temperature of reaction.
As shown in Figure 5: NaCl concentration and BET are certain dependency, NaCl concentration is when below 80g/L, and BET has reduction to a certain degree with the increase of NaCl concentration; When NaCl concentration is between 80g/L to 120g/L, BET has increase to a certain degree with the increase of NaCl concentration; NaCl concentration is when more than 120g/L, and BET has reduction to a certain degree with the increase of NaCl concentration; Therefore the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system can be reduced by the mode of adding NaCl in right amount.
As shown in Figure 6: when ageing pH is more than 3.0, BET reduces with the increase of ageing pH, and in actual production, ageing pH is general more than 3.0, therefore can reduce the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system by the mode improving ageing pH.
Embodiment 2BET is 117m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 22%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 94 DEG C of conditions, reaction 60min;
(4) pH of reaction solution is adjusted to 6, under temperature 94 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 3; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 117m
2/ g.
Embodiment 3BET is 110m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 94 DEG C of conditions, reaction 60min;
(4) pH of reaction solution is adjusted to 7, under temperature 94 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 3; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 110m
2/ g.
Embodiment 4BET is 100m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 30%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 94 DEG C of conditions, reaction 60min;
(4) pH of reaction solution is adjusted to 7, under temperature 94 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 3; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 100m
2/ g.
Embodiment 5BET is 94m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 35%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 94 DEG C of conditions, reaction 60min;
(4) pH of reaction solution is adjusted to 10, under temperature 94 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 3; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 94m
2/ g.
Embodiment 6BET is 180m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 25%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8, temperature 84 DEG C of conditions, reaction 150min;
(4) pH of reaction solution is adjusted to 4, under temperature 84 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 2; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 180m
2/ g.
Embodiment 7BET is 165m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8, temperature 84 DEG C of conditions, reaction 150min;
(4) pH of reaction solution is adjusted to 5, under temperature 84 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 2; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 165m
2/ g.
Embodiment 8BET is 150m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 35%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8, temperature 84 DEG C of conditions, reaction 150min;
(4) pH of reaction solution is adjusted to 5, under temperature 84 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 2; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 150m
2/ g.
Embodiment 9BET is 142m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 30%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 84 DEG C of conditions, reaction 150min;
(4) pH of reaction solution is adjusted to 5, under temperature 84 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 2; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 142m
2/ g.
Comparative example 1BET is 120m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH10, temperature 94 DEG C of conditions, reaction 60min;
(4) pH of reaction solution is adjusted to 6, under temperature 94 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 3; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 120m
2/ g.
Comparative example 2BET is 200m
2the production of the white carbon black of/g
(1) in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(2) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20%;
(3) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8, temperature 84 DEG C of conditions, reaction 150min;
(4) pH of reaction solution is adjusted to 4, under temperature 84 DEG C of conditions, ageing 60min, obtains slip;
(5) pH of described slurry is adjusted to 2; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product;
(6) the method measurement the specific area BET in HG/T3073-2008 is adopted to be 200m
2/ g.
Compared with comparative example 1 by embodiment 2 ~ 5, embodiment 6 ~ 9 compares can find out with comparative example 2: improve the mass concentration of reaction water glass or improve the pH value of ageing, all can reduce the white carbon black specific surface area BET that sulfuric acid precipitation legal system is standby.
Applicant states, the present invention illustrates method detailed of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned method detailed, does not namely mean that the present invention must rely on above-mentioned method detailed and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (14)
1. reduce a method of the standby white carbon black specific surface area BET of sulfuric acid precipitation legal system, it is characterized in that, said method comprising the steps of:
(1) preparing mass concentration is the water glass solution of 20% ~ 35%;
(2) described water glass solution and sulphuric acid soln are mixed in reactor, under pH8 ~ 11, temperature 80 ~ 98 DEG C of conditions, reaction 60 ~ 150min;
(3) pH of reaction solution is adjusted to 6 ~ 10, under temperature 80 ~ 98 DEG C of conditions, ageing 30 ~ 120min, obtains slip;
(4) pH of described slip is adjusted to 2 ~ 5, obtains white carbon black finished product through press filtration, pulp and drying;
Described step (1) also comprises: in described water glass solution, add sodium-chlor, fully dissolve; The content of described sodium-chlor is 120 ~ 300g/L.
2. method according to claim 1, is characterized in that, in described step (1), the modulus of water glass is 3.0 ~ 4.0.
3. method according to claim 1, is characterized in that, described step (1) is specially:
(1a) in dissolution kettle, solid water glass and water is added, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(1b) the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20 ~ 35%, for subsequent use.
4. method according to claim 1 and 2, is characterized in that, in described step (2), the concentration of sulphuric acid soln is 40% ~ 98%.
5. method according to claim 1 and 2, is characterized in that, in described step (2), pH is 9 ~ 11.
6. method according to claim 1 and 2, is characterized in that, in described step (2), temperature is 85 ~ 96 DEG C.
7. method according to claim 1 and 2, is characterized in that, in described step (2), the time of reaction is 80 ~ 120min.
8. method according to claim 1 and 2, is characterized in that, in described step (3), the temperature of ageing is 85 ~ 96 DEG C.
9. method according to claim 1 and 2, is characterized in that, in described step (3), the time of ageing is 45 ~ 100min.
10. method according to claim 1 and 2, is characterized in that, press filtration is specially in described step (4): carry out press filtration by pressure filter, then wash, and washes away sodium sulfate impurity, obtained filter cake with filtering part water.
11. methods according to claim 1 and 2, is characterized in that, in described step (4), pulp is specially: in pulp tank, and being stirred by agitator by obtained filter cake becomes flowable slip.
12. methods according to claim 1 and 2, is characterized in that, in described step (4), drying is specially: in drying tower, carry out drying removing moisture, make white carbon black finished product by the slip of warm air to atomization.
13. methods according to claim 1, is characterized in that, the content of described sodium-chlor is 120 ~ 250g/L.
14. methods according to claim 1 and 2, is characterized in that, described method comprises:
(a ') in dissolution kettle, add solid water glass and water, pass into steam that pressure is greater than 0.7Mpa in dissolution kettle, be 0.5 ~ 0.6Mpa to dissolution kettle internal pressure after steam off, be incubated 2 ~ 3 hours, be dissolved into the liquid soluble glass that mass concentration is more than 35%;
(b ') the described liquid soluble glass dissolved is added water in water glass adjustment tank, be diluted to the water glass solution that mass concentration is 20 ~ 35%, add sodium-chlor simultaneously and fully dissolve, the content to sodium-chlor is 120 ~ 300g/L;
(c ') described water glass solution and sulphuric acid soln are mixed in reactor, under pH8 ~ 11, temperature 80 ~ 98 DEG C of conditions, reaction 60 ~ 150min;
(d ') pH of reaction solution is adjusted to 6 ~ 10, under temperature 80 ~ 98 DEG C of conditions, ageing 30 ~ 120min, obtains slip;
(e ') pH of described slip is adjusted to 2 ~ 5; Carry out press filtration by pressure filter, then wash, wash away sodium sulfate impurity with filtering part water, obtained filter cake; In pulp tank, obtained filter cake is stirred by agitator and becomes flowable slip; In drying tower, carry out drying removing moisture by the slip of warm air to atomization, make white carbon black finished product.
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| CN101786633A (en) * | 2010-02-26 | 2010-07-28 | 无锡恒诚硅业有限公司 | Production technology of white microbead-shaped white carbon black |
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