CN1033194A - The process for purification of lactic acid produced by fermentation of corn - Google Patents
The process for purification of lactic acid produced by fermentation of corn Download PDFInfo
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- CN1033194A CN1033194A CN 87101404 CN87101404A CN1033194A CN 1033194 A CN1033194 A CN 1033194A CN 87101404 CN87101404 CN 87101404 CN 87101404 A CN87101404 A CN 87101404A CN 1033194 A CN1033194 A CN 1033194A
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- lactic acid
- corn
- fermentation
- purification
- acid produced
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Abstract
The present invention is a kind of process for purification with settlement separate lactic acid produced by fermentation of corn for main purification means.Corn fermentation liquid maintains 90 to 100 ℃, by add unslaked lime and protein settling agent magnesium chloride or dihydrate gypsum or ammonium sulfate in fermented liquid, uses the filter residue of metathesis and bleaching process to make flocculating aids, filters.Can eliminate detrimental impurity-protein, grease and remaining reducing sugar in the lactic acid produced by fermentation of corn treating process effectively.
Description
The invention belongs to fermentative Production lactic acid field.Say so in more detail and belong to the process for purification of lactic acid produced by fermentation of corn.
Till now, the process for purification of lactic acid produced by fermentation of corn, generally adopting with the calcium lactate crystallization and purification is the process for purification of main purification means.Owing to contain impurity such as more protein, grease and remaining reducing sugar in the corn lactic acid fermentation liquid, in crystallisation process, these impurity also double team among crystallization, add that the calcium lactate crystals solubility is bigger, caused the disadvantage that refining effect is poor, the operating time is long, material loss is serious, yield is low.
Purpose of the present invention, study a kind of method that can remove detrimental impurity in the corn fermentation liquid-high-load protein, grease and remaining reducing sugar exactly, make the present invention become that a kind of refining effect is good, the operating time is short, loss of material is few, the process for purification of the lactic acid produced by fermentation of corn that yield is high.
In order to realize purpose of the present invention, the present invention has adopted settlement separate purification to replace the process for purification of calcium lactate crystallization and purification.Under 90-100 ℃, the unslaked lime that adds capacity in the lactic acid fermentation clear liquid that filter press comes out comes out the fully saponified postprecipitation of grease, adds protein settling agent magnesium chloride or ammonium sulfate or dihydrate gypsum, make protein condense from fermented liquid, remaining reducing sugar is also along with settling down; Having adopted the filter residue in replacement(metathesis)reaction and the bleaching process is that flocculating aids carries out vacuum filtration, and sediment is separated with fermentation clear liquid.Adopt settlement separate purification of the present invention, can remove three kinds of detrimental impurity-high content of protein matter, grease and residual sugars in the corn lactic acid fermentation liquid.
Below in conjunction with accompanying drawing the present invention is described in further detail:
Fig. 1 has represented the feel flow draw of block of the refining whole process of lactic acid produced by fermentation of corn.
Fig. 2 represents the settlement separate purifying technique schema of corn lactic acid fermentation liquid of the present invention:
With reference to Fig. 1, concentrate the process for purification that concentrates the lactic acid produced by fermentation of corn that forms with operations such as decolouring (7), finished product packings (8) with decolouring (5), ion-exchange (6), finished product by plate compression (1), sedimentation separation (2), evaporation enrichment (3), double decomposition and decolouring (4), semi-finished product.
With reference to Fig. 2, the sedimentation separation flow chart of the corn lactic fermentation liquid that is formed by retort (9), vacuumfilter (10), collecting tank (11) and storage tank (12). It is 0.5 to 25m that corn lactic acid fermentation clear liquid behind plate compression metering ground is added volume3Retort (9) in, stir lower logical Steam Heating, the temperature of keeping zymotic fluid is 90 to 100 ℃, in retort (9), adds quick lime, addition is counted 0.1～0.6% of corn lactic acid fermentation clear liquid weight with CaO; After 10 to 50 minutes, add the protein settling agent, it is different and different that the addition of protein settling agent is looked its kind; The solid magnesium chloride is with MgCl2·6H
2O counts 0.2 to 0.8% of corn lactic acid fermentation clear liquid weight; Dihydrate gypsum is with CaSO4·2H
2O counts 0.4 to 1.2% of corn lactic acid fermentation clear liquid weight, and ammonium sulfate is 0.2 to 1.0%; After stirring corn lactic fermentation liquid certain hour, left standstill 4 to 12 hours, in vacuumfilter (10), (Main Ingredients and Appearance is calcium sulfate and active carbon to the filter residue that (internal diameter of nutsch filter be 0.5 to 1.0M) produces with double decomposition and bleaching process (4),) make filter aid, carry out while hot vacuum filtration, filtrate is put into storage tank (12) through collecting tank (11), in storage tank (12) In, be 8 to 10 with lime slurry neutralization to pH after, by block diagram shown in Figure 1 according to the method for routine evaporate, decolouring, double decomposition, concentrate, the operation food prepared therefrom level lactic acid such as ion-exchange.
Embodiment 123456
Fermented liquid throws 0.45 0.45 0.45 0.50 15.8 19.2
Go into the amount ton
Calcium lactate contains 11.0 10.8 11.0 12.0 10.0 11.14
Amount wt%
Residual sugar content 0.42 0.44 0.44 0.44 0.38 0.41
wt%
Precipitation reaction 93 93 96 93 96 92
Temperature t ℃
CaO consumption 0.5 0.4 0.4 0.3 0.3 0.3
wt%
Sinking agent ammonium sulfate plaster stone plaster stone magnesium chloride magnesium chloride magnesium chloride
Sinking agent is with 0.3 1.0 0.7 0.5 0.4 0.3
Amount wt%
Settling time 10 10 879 10
Hour
Flocculating aids thick 25 25 35 10 36 27
The degree centimetre
Filtrate total nitrogen≤0.01≤0.01≤0.01≤0.01≤0.01≤0.01
Amount wt%
The filtrate residual sugar can't check
Amount wt%
The filtrate grease can't check
Content wt%
From embodiment 1～6, can find out, by method of the present invention, can remove protein, grease and the remaining reduced sugar of the objectionable impurities-high-load in the corn lactic fermentation liquid. The present invention compares with the technology of old crystallization and purification, have these advantages: (1) technological process is simplified, production cycle shortens, the metathesis reaction product easily filters, suction filtration speed is fast, ion-exchange process only needs just can to reach regulator cleanup standards through a cation exchange and an anion exchange, is that the old process for refining led lacks and uses the cation exchange operation one time than crystallization. (2) reduce material loss, yield significantly improves, and compares with old technology, and yield can improve 10～20%. (2) improved working condition, eliminated wastewater pollution source, take crystallization as main old process using a large amount of crystallizers, floor space is big, the mother liquor and the cleaning solution contaminated environment that run off, technology of the present invention has been cancelled the crystallization purification process, has improved working condition, the environmental pollution of having avoided material loss to cause.
Claims (4)
1, a kind of process for purification with lactic acid produced by fermentation of corn comprising evaporation, metathesis, decolouring, ion-exchange process, is characterized in that:
A, intensification, the temperature maintenance that makes the corn lactic acid fermentation clear liquid in the retort [10] is at 90 to 100 ℃.
B, add unslaked lime in retort [10], the add-on of unslaked lime is 0.1 to 0.6% (weight)
C, in retort [10], add magnesium chloride or dihydrate gypsum or ammonium sulfate.
D, leave standstill through the lactic acid fermentation clear liquid after a, b, the c step 4 to 12 hours.
E, in vacuumfilter [11] by the settlement separate lactic acid fermentation clear liquid of flocculating aids suction filtration.
F, the lactic acid fermentation clear liquid after the e step by known method evaporate, metathesis, the refining said corn lactic acid lotion clear liquid of ion-exchange process.
2,, it is characterized in that said magnesium chloride is solid magnesium chloride (MgCl according to the process for purification of said lactic acid produced by fermentation of corn among claim 1, the c
26H
2O) add-on of magnesium chloride is 0.2 to 0.8%(weight), dihydrate gypsum (CaSO
42H
2O) add-on is 0.4 to 1.2%(weight), the add-on of ammonium sulfate is 0.2 to 1.0%(weight).
3,, it is characterized in that said flocculating aids is the filter residue in metathesis and the bleaching process according to the process for purification of said lactic acid produced by fermentation of corn among the claim 1e.
4, according to the process for purification of said lactic acid produced by fermentation of corn in the claim 3, the thickness that it is characterized in that said flocculating aids is 10 to 36 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101404 CN1033194A (en) | 1987-11-16 | 1987-11-16 | The process for purification of lactic acid produced by fermentation of corn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101404 CN1033194A (en) | 1987-11-16 | 1987-11-16 | The process for purification of lactic acid produced by fermentation of corn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1033194A true CN1033194A (en) | 1989-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101404 Pending CN1033194A (en) | 1987-11-16 | 1987-11-16 | The process for purification of lactic acid produced by fermentation of corn |
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| CN (1) | CN1033194A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293033C (en) * | 1999-10-12 | 2007-01-03 | 普拉克生化公司 | Continuous process for preparing lactic acid |
-
1987
- 1987-11-16 CN CN 87101404 patent/CN1033194A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293033C (en) * | 1999-10-12 | 2007-01-03 | 普拉克生化公司 | Continuous process for preparing lactic acid |
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