CN106336351A - Efficient and energy-saving formaldehyde production process applied in amino molding compound production - Google Patents
Efficient and energy-saving formaldehyde production process applied in amino molding compound production Download PDFInfo
- Publication number
- CN106336351A CN106336351A CN201510395142.7A CN201510395142A CN106336351A CN 106336351 A CN106336351 A CN 106336351A CN 201510395142 A CN201510395142 A CN 201510395142A CN 106336351 A CN106336351 A CN 106336351A
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- formaldehyde
- production technology
- formaldehyde production
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- waste water
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/78—Separation; Purification; Stabilisation; Use of additives
- C07C45/783—Separation; Purification; Stabilisation; Use of additives by gas-liquid treatment, e.g. by gas-liquid absorption
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a formaldehyde production process, especially to an efficient and energy-saving formaldehyde production process applied in amino molding compound production. The formaldehyde production process makes full use of the absorbed heat produced in the formaldehyde production process, at the same time the wastewater generated in amino molding compound production is filtered by an activated carbon filter and subjected to decoloration treatment by a ceramic ultrafiltration membrane, then the treated wastewater is mixed with the raw material liquid state methanol, and the mixture is transported to an evaporator. The process not only solves the influence of low quality heat generated by an absorption tower to scaling of a heat exchanger, but also solves the wastewater treatment problem in the amino molding compound production process.
Description
Technical field
The present invention relates to a kind of formaldehyde production technology, more particularly to a kind of it is applied to energy-efficient formaldehyde production technology during amino film plastics produce.
Background technology
Amino film plastics are commonly called as urea-formaldehyde moulding powder, due to its low in raw material price simple production process, environmental protection easily solves, combinations color and lustre is bright-coloured, smooth in appearance, and odorless, tasteless has self-extinguishment and arc resistance, heat-resisting, fire-retardant, low cigarette, product size is stable, electrical insulating property good and easily coloring the advantages of, thus be widely used in the industries such as electronics, electrical equipment, automobile, machinery, daily utensil.The production process route of amino film plastics has 2 at present, and one is the wet route that most countries are adopted, the buss method that buss company of another Tiao Shi Switzerland creates.Wet route is: carbamide (tripolycyanamide) and formaldehyde firstly generate resin in reactor, then filler and other adjuvants in kneader and mixed with resin, then is dried in exsiccator, then pulverizing, ball milling, be screened into end product.And buss method only has 2 steps: carbamide and formaldehyde react in reactor, in high speed mixing smelting machine, then add other fillers and resin, mixing dehydration at a high speed is direct to obtain pelletized product.
Wherein, amino film plastics production process can produce substantial amounts of amino mould waste water unavoidably, it contains substantial amounts of formaldehyde, therefore how effective process amino mould waste water complies with national requirements for environmental protection is always domestic and international amino film plastics production industry focus of attention.In the prior art, in " application of high-concentration formaldehyde wastewater treatment technology and popularization " literary composition, the process of amino mould waste water is described in further detail, but because its process step is loaded down with trivial details, is applied on a large scale always.
One of primary raw material as amino film plastics formaldehyde, its production method includes silver-colored method and ferrum molybdenum method, and the former because its small investment, power consumption are low, low production cost advantage occupy leading position in Formaldehyde Production at home.The basic procedure that silver-colored method produces formaldehyde is: enters reactor after methanol gas, air and dispensing steam, in the presence of silver catalyst, gaseous mixture reacts, generates formaldehyde gases.Because formaldehyde easily decomposes at high temperature, reduce formaldehyde yield, therefore gaseous product must cool down as early as possible, formaldehyde gases after cooling enter absorption tower and are absorbed by liquid absorption and then produce heat, and in order to ensure proceeding of production, the low-quality heat of this part must be removed, due to recirculated water in heat exchanger heat exchange be easy for leading to fouling of heat exchangers, increased the load of cooling tower, also Just because of this, this low-quality heat is difficult to obtain rational recycling simultaneously.
In addition how together to be entered in oxidator as dispensing steam and air, methanol gas using self-produced steam in prior art, to remove the heat because oxidation produces to control the temperature of silver layer, therefore self-produced steam a big chunk is used up and can not be sold outward by oneself, thus increased the production cost of formaldehyde.
It is an object of the invention to overcoming above-mentioned weak point of the prior art, by optimization design, provide a kind of low-quality heat making full use of and producing during formaldehyde absorption, and it is the negative effect overcoming this low-quality torrid zone, creative is delivered to vaporizer by after the waste water producing in amino film plastics production process and raw material liquid methanol mixed, not only solve the impact due to absorbing the low-quality hot heat exchanger fouling producing, also solve amino film plastics and produce a wastewater treatment difficult problem in overshoot, simultaneously because containing a large amount of water in waste water, just reduce the consumption of steam dispensing, therefore have efficiently, energy-conservation, environmental protection, the many merits such as low cost.
Content of the invention
The technical solution adopted in the present invention is a kind of to be applied to energy-efficient formaldehyde production technology during amino film plastics produce, its process units includes vaporizer, reactor, absorption plant and exhaust gas processing device, it is characterized in that the low-quality heat producing in absorption tower is passed into the heat exchanging segment of vaporizer to provide Bao Kuo the energy needed for raw mixture volatilization including methanol as thermal source, wherein, described raw mixture is the amino film plastics waste water after active carbon filter filtration and ceramic super-filtering film desolventing technology, mass concentration is 100% liquid methanol and other raw material mixing gained, in described raw mixture, the mass concentration of methanol is 30%-80%, the aperture of described ceramic super-filtering film is less than or equal to 0.05 μm.
Wherein, described absorption plant includes first order absorption tower and second level absorption tower, and wherein, described other raw materials can be that the second level absorbs the tail gas that top of tower produces.
Wherein, described heat exchanging segment equipment is heat exchanger.
Wherein, described heat exchanger is arranged on outside vaporizer, also has extra firing equipment preferably inside vaporizer.
Wherein, described heat exchanger is arranged on inside vaporizer.
Wherein, described heat exchanging segment heat exchange is to carry out heat exchange realization by the absorbing liquid absorbing tower bottom with the first order.
Wherein, described amino mould waste water main component is water, formaldehyde, and wherein the mass concentration scope of formaldehyde is 1-2%.
Wherein, described amino film plastics waste water mix with the liquid methanol that mass concentration is 100% be amino film plastics waste water is passed directly in liquid methanol delivery pipe or amino film plastics waste water is passed directly in liquid methanol delivery pipe after through one static mixer mix, before wherein said venturi gaseous mixture is arranged on heat exchanging segment.
The invention has the beneficial effects as follows:
1. first, the low-quality heat absorbing generation in absorption tower is evaporated thermal source as formaldehyde, solve the difficult problem that low-quality heat is difficult to be utilized effectively, there is energy-saving and environmental protection, the advantage of reduction enterprise's production capacity.
2. secondly, it is delivered to after amino film plastics waste water is mixed with liquid methanol in vaporizer, not only solves the impact due to absorbing the low-quality hot heat exchanger fouling producing, also solve amino film plastics and produce a wastewater treatment difficult problem in overshoot.On this basis, by the optimization of both the mass concentration ratios in the mixed solution to amino film plastics waste water and liquid methanol, it is to avoid there are excessive formaldehyde gases in mixed solution in mixed solution affects the situation that methanol oxidation occurs.
3. in addition, being directed to the application as raw material again of amino mould waste water, the pre-treating method being combined with ceramic super-filtering film using optimal active carbon filter, not only efficiently, energy-conservation, and disclosure satisfy that waste water is used for the requirement of oxidation of formaldehyde.
4. finally, due to contain a large amount of water in amino film plastics waste water, it is added in vaporizer and instead of dispensing steam under air gas stripping, thus save substantial amounts of steam can sell in addition.
Brief description
The present invention is further described in conjunction with the accompanying drawings and embodiments:
Fig. 1 is the process chart of the present invention
In figure, 1- vaporizer, 2- reactor, 3- drum i, 4- first order absorption tower, 5- second level absorption tower, 6- tail gas liquid seal trough, 7- exhaust gas treating device, 8- drum ii, 9- heat exchanger, 10- condenser, 11- active carbon filter, 12- ceramic super-filtering film；
A- amino film plastics original waste water, b- liquid methanol, c- air, d- dispensing steam, e- methanol-air-steam-tail gas quaternary gaseous mixture, f- crude product gas, g- recycled offgas, h- product, the pending tail gas of i-, tail gas after j- purification, k- steam product.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings:
It is further details of explanation to the present invention presently in connection with drawings and Examples.This accompanying drawing is the schematic diagram simplifying, and the typical process flow of the present invention is only described in a schematic way, therefore it only shows the composition relevant with the present invention.
Preferred forms as shown in Figure 1, its technological process is as follows: original waste water a in producing from amino film plastics is filtered through active carbon filter 11 and nanofiltration membrane 12 (aperture is 0.02 μm) desolventing technology after be delivered to the mixing realizing between two kinds of fluids in the liquid methanol b conveyance conduit that mass concentration is 100%.Mixed liquor enters in vaporizer 1 after heat exchanger 9 heating, mixed solution is under the gas stripping of air c, with the dispensing steam d from drum 3, the mixing of the tail gas from absorption tower 5 top, form methanol-air-steam-tail gas quaternary gaseous mixture e, and be transported to reactor 2.In reactor 2, there is dehydrogenation oxidation reaction under silver catalyst effect, methanol is oxidized to formaldehyde, and the heat that this exothermic reaction produces is absorbed generation steam by drum 3, thus being introduced in vaporizer 1 be recycled as dispensing steam d.The crude product gas f leaving reactor 2 sequentially enters first order absorption tower 4 and second level absorption tower 5, Absorption through absorbing liquid, formaldehyde gases in crude product gas f are all absorbed, and absorb the absorbing liquid of high temperature formaldehyde gases and aforementioned mixed liquor after heat exchange at heat exchanger 9 further by condenser 10 cooling down, a portion absorbing liquid continues back in first order absorption tower and carries out GAS ABSORPTION, and another part absorbing liquid is then delivered in corresponding products pot (not shown) as product h.Equally, the tail gas part not being absorbed by liquid absorption returns to as raw material in vaporizer 1 as recycled offgas g, and another part of tail gas then sequentially passes through as pending tail gas i and enters in the air after tail gas liquid seal trough 6 and the process of exhaust gas treating device 7.Wherein, the heat that exhaust gas treating device 7 produces during absorbing tail gas obtains the steam of high-quality through drum ii, can be commercially available as product.
The foregoing is only highly preferred embodiment of the present invention, be not limited to the present invention.Any modification, equivalent substitution and improvement done within all principles in the present invention and spirit etc., should be included in protection scope of the present invention.
Claims (9)
1. a kind of be applied to energy-efficient formaldehyde production technology during amino film plastics produce, it produces dress
Put including vaporizer, reactor, absorption plant and exhaust gas processing device it is characterised in that by absorption tower
The low-quality heat of middle generation is passed into the heat exchanging segment of vaporizer to provide including methanol as thermal source
Energy needed for raw mixture volatilization, wherein, described raw mixture is to filter through active carbon filter
And the liquid first that the amino film plastics waste water after ceramic super-filtering film desolventing technology, mass concentration are 100%
Alcohol and other raw material mixing gained, in described raw mixture, the mass concentration of methanol is 30%-80%,
The pore diameter range of described ceramic super-filtering film is less than or equal to 0.05 μm.
2. formaldehyde production technology according to claim 1 is it is characterised in that absorption plant includes
First grade absorption tower and second level absorption tower, wherein, described other raw materials can be second level absorption tower
The tail gas that top produces.
3. formaldehyde production technology according to claim 1 is it is characterised in that described heat exchanging segment sets
Standby for heat exchanger.
4. formaldehyde production technology according to claim 3 is it is characterised in that described heat exchanger sets
Put outside vaporizer.
5. formaldehyde production technology according to claim 3 is it is characterised in that described heat exchanger sets
Put inside vaporizer.
6. formaldehyde production technology according to claim 3 is it is characterised in that go back inside vaporizer
There is extra firing equipment.
7. formaldehyde production technology according to claim 1 is it is characterised in that described heat exchanging segment changes
Heat is to carry out heat exchange realization by the absorbing liquid absorbing tower bottom with the first order.
8. the formaldehyde production technology described in claim 1 is it is characterised in that described amino mould waste water master
Composition is wanted to be water, formaldehyde, wherein the mass concentration scope of formaldehyde is 1-2%.
9. formaldehyde production technology according to claim 1 is it is characterised in that described amino molds
It is to be passed directly into amino film plastics waste water that material waste water is mixed with the liquid methanol that mass concentration is 100%
It is passed directly in liquid methanol delivery pipe in liquid methanol delivery pipe or by amino film plastics waste water
Mix by a static mixer, before wherein said venturi gaseous mixture is arranged on heat exchanging segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510395142.7A CN106336351A (en) | 2015-07-07 | 2015-07-07 | Efficient and energy-saving formaldehyde production process applied in amino molding compound production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510395142.7A CN106336351A (en) | 2015-07-07 | 2015-07-07 | Efficient and energy-saving formaldehyde production process applied in amino molding compound production |
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| Publication Number | Publication Date |
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| CN106336351A true CN106336351A (en) | 2017-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510395142.7A Pending CN106336351A (en) | 2015-07-07 | 2015-07-07 | Efficient and energy-saving formaldehyde production process applied in amino molding compound production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106316806A (en) * | 2015-07-03 | 2017-01-11 | 常州乔尔塑料有限公司 | Formaldehyde production process applied to production of amino molding plastics |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633609A (en) * | 2012-04-16 | 2012-08-15 | 常州乔尔塑料有限公司 | Formaldehyde production technology capable of recycling amino plastic waste water and equipment thereof |
-
2015
- 2015-07-07 CN CN201510395142.7A patent/CN106336351A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633609A (en) * | 2012-04-16 | 2012-08-15 | 常州乔尔塑料有限公司 | Formaldehyde production technology capable of recycling amino plastic waste water and equipment thereof |
Non-Patent Citations (1)
| Title |
|---|
| 徐富等: "高浓度甲醛废水处理技术的应用和推广", 《2009年中国甲醛行业协会年会暨国内外技术交流会报告集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106316806A (en) * | 2015-07-03 | 2017-01-11 | 常州乔尔塑料有限公司 | Formaldehyde production process applied to production of amino molding plastics |
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