CN1834083A - Prepn. of vinyl acetate by carbinol and synthetic gas - Google Patents
Prepn. of vinyl acetate by carbinol and synthetic gas Download PDFInfo
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- CN1834083A CN1834083A CNA2005100539338A CN200510053933A CN1834083A CN 1834083 A CN1834083 A CN 1834083A CN A2005100539338 A CNA2005100539338 A CN A2005100539338A CN 200510053933 A CN200510053933 A CN 200510053933A CN 1834083 A CN1834083 A CN 1834083A
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- vinyl acetate
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- eda
- acetic acid
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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
Abstract
This invention relates to a new technique flow to produce vinyl acetate. The basic principle in this invention is that, methyl acetate is synthesized first, which is then carbonylated into vinyl acetate. The whole synthesis technique is divided into two steps; the first one is the hydroformylation of methyl acetate into ethylene acetate and the second one is the decomposition of ethylene acetate into acetic acid and vinyl acetate (VAC). There mainly include a hydroformylation reactor, a decomposition furnace and a VAC distillation tower in the flow chart. In this new technique, coal can be adopted as raw materials, with which methanol is synthesized and VAC is further synthesized. Therefore, the production of calcium carbide, which is a high energy consumption step, can be avoided and this technique is energy saving and contributes a lot to resource economization and environment protection. The success of the new technique is of great meanings to sustainable development.
Description
Technical field
The present invention relates to a kind of technical process of new production vinyl acetate between to for plastic, this novel process can save energy, cuts down the consumption of energy, to making rational use of resources, preserved the ecological environment very important effect.
Background technology
Vinyl acetate between to for plastic (VAC) is important basic Organic Chemicals, and its preparation method is mainly ethylene process, natural gas act and acetylene method all more than 2,800,000 tons every year for present global output.Because ethene and natural gas source lack; acetylene method is again because of the shortcoming of its high energy consumption; be restricted day by day; and present technique is to be basic raw material with the coal; the laggard one-step synthesis VAC of synthesizing methanol; avoided the production link of this high energy consumption of calcium carbide from technological process, to making rational use of resources, it is significant to preserve the ecological environment.The comprehensive utilization of coal at present still rests on the lower level in China, and succeeding in developing of present technique has significant meaning to the development that promotes coal resource utilization and coal chemical technology.
VAC is as organic chemical industry's intermediate, be mainly used to produce PVA, PVB (polyvinyl butyral acetal), vinyl acetate between to for plastic homopolymer, vinyl acetate between to for plastic and ethylene copolymer (EVA, VAE), vinyl acetate between to for plastic and nitrogen ethene vinegar butenoic acid, binary, ternary and the multiple copolymer of unsaturated acid such as maleic acid and unsaturated acid, the alcoholysis product of vinyl acetate between to for plastic and ethylene copolymer (EVOH) etc.These products have purposes very widely at aspects such as weaving, coating thing, tackiness agent (as cigarette glue etc.), film, medicine, organic synthesis, fine chemistry industry, daily-use chemical industries, and global output is more than 2,800,000 tons/year, and only output in domestic has reached 1,000,000 tons.Along with the continuous expansion of PVA purposes, will stimulate the consumption market of PVA greatly in recent years, especially the PVA demand increases year by year, and supply falls short of demand for home products.And along with this feature of environmental protection of PVA and multi-usage product progressively are familiar with by people, domestic, world market all has very large potentiality.
Because of the reversing process that is decomposed into of ritalin (MeOAC), rate of decomposition is about 25%, and a large amount of materials circulations consume a large amount of energy in the decomposition course, adds the production load of bigger device, causes the PVA cost high.In this case, seeking the processing method of the synthetic VAC of MeOAC and make it industrialization, is to reduce PVA production cost, realization Sustainable development important approach.
Summary of the invention
The present invention proposes a kind of technical process of new production vinyl acetate between to for plastic, this flow process can cut down the consumption of energy, and is very important to rationally utilizing the conservation of resources ecotope to play a part.
Main technical schemes: the chemical principle of producing vinyl acetate between to for plastic is, is the synthetic VAC of intermediate with MeOAC, and whole synthesis process divided for two steps finished, and the first step generates two acetic acid ethyls by the ritalin hydroformylation; Second step was cracked into acetic acid and VAC by two acetic acid ethyls, and in entire reaction course, important intermediate is EDA and CH
3COOH, palladium, methyl iodide and triphenylphosphine are catalyzer and promotor, and EDA be cracked into reversible reaction, be divided into for two steps:
Therefore the by product of whole process is acetaldehyde and aceticanhydride.
In whole technological process, MeOAC and Catalyst for CO, H
2Generate two acetic acid ethyls (EDA) and enter flasher afterwards in the hydroformylation reaction device, light component and clean reactant are got rid of from the top, palladium with directly get back in the reactor after EDA separates; The top is got rid of thing and isolate acetaldehyde, methyl iodide, MeOAC, acetic acid and aceticanhydride in a series of rectifying tower.Acetaldehyde and a part of aceticanhydride enter reactor makes ion exchange resin react generation EDA again, and all the other aceticanhydrides are to the hydrolysis of acetylene method PVA subsidiary factory.EDA enters pyrolyzer, and other components are circulated to the hydroformylation reaction device.EDA under 170 ℃ of 0.1Pa conditions under the catalysis of benzene acid iodide liquid-phase pyrolysis, generate VAC and acetic acid.Reaction product steams and enters light component tower rapidly from cat head in cleavage column, and cleavage column substrate material enters EDA rectifying tower group front end.Contain acetaldehyde, VAC, acetic acid and unreacted EDA and other light components in the light component tower charging, the light component circulation of cat head distilled enters the EDA rectifying tower.Liquid enters the acid extraction tower at the bottom of the rectifying tower, and acid extraction top of tower fraction mainly is VAC.To acetylene method PVA subsidiary factory, acetic acid tower bed material contains EDA and catalyzer returns cleavage column from cat head for acetic acid.Light component cat head steams thing and enters in the VAC tower and separate, and from the side line extraction, the cat head material is circulated to the component tower to VAC as product, and the bottoms material is circulated to acid extraction tower phegma.
Description of drawings
Fig. 1 is the process flow sheet of this technology.
Embodiment
VAC is as important basic Organic Chemicals; range of application is very extensive, and present technique is basic raw material with the coal, the laggard one-step synthesis VAC of synthesizing methanol; avoided the production link of this high energy consumption of calcium carbide from technological process, very important to rationally utilizing the conservation of resources ecotope to play a part.
Claims (6)
1, a kind of technical process of new production vinyl acetate between to for plastic, its primitive reaction principle be, carries out the synthetic of ritalin earlier, generates vinyl acetate between to for plastic by carbonylation again.
2, the novel process of production vinyl acetate between to for plastic according to claim 1 can be basic raw material with the coal, or other Sweet natural gas, and oil etc. are raw material, produces methyl alcohol and synthetic gas resynthesis vinyl acetate between to for plastic afterwards.
3, the novel process of production vinyl acetate between to for plastic according to claim 1, ritalin and carbon monoxide, hydrogen generate two acetic acid ethyls (EDA) and enter flasher afterwards in the hydroformylation reaction device, light component and clean reactant are got rid of from the top, the catalyst acetic acid palladium with directly get back in the reactor after EDA separates; The top is got rid of thing and isolate acetaldehyde, methyl iodide, ritalin, acetic acid and aceticanhydride in a series of rectifying tower.
4, the novel process of production vinyl acetate between to for plastic according to claim 1, its building-up process can be finished in two steps: the first step generates EDA by the ritalin hydroformylation; Second step was cracked into acetic acid and vinyl acetate between to for plastic by EDA.
5, the novel process of production vinyl acetate between to for plastic according to claim 1, acetaldehyde and a part of aceticanhydride enter reactor makes ion exchange resin react generation EDA again, and all the other aceticanhydrides are to the hydrolysis of acetylene method polyvinyl alcohol (PVA) subsidiary factory.EDA enters pyrolyzer, and other components are circulated to the hydroformylation reaction device.
6, the novel process of production vinyl acetate between to for plastic according to claim 1, reaction product steams and enters light component tower rapidly from cat head in cleavage column.Contain acetaldehyde, vinyl acetate between to for plastic, acetic acid and unreacted two acetic acid ethyls and other light components in the light component tower charging, cat head distillates light component circulation and enters the EDA rectifying tower.Light component cat head steams thing and enters in the vinyl acetate between to for plastic tower and separate, and from the side line extraction, the cat head material is circulated to light component tower to vinyl acetate between to for plastic as product, and the bottoms material is circulated to acid extraction tower phegma.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100539338A CN1834083A (en) | 2005-03-14 | 2005-03-14 | Prepn. of vinyl acetate by carbinol and synthetic gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100539338A CN1834083A (en) | 2005-03-14 | 2005-03-14 | Prepn. of vinyl acetate by carbinol and synthetic gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1834083A true CN1834083A (en) | 2006-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100539338A Pending CN1834083A (en) | 2005-03-14 | 2005-03-14 | Prepn. of vinyl acetate by carbinol and synthetic gas |
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| CN (1) | CN1834083A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104549309A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Supported ethylidene diacetate catalyst |
| CN105268486A (en) * | 2014-07-11 | 2016-01-27 | 中国石油化工股份有限公司 | Ethylidene diacetate catalyst and application thereof |
-
2005
- 2005-03-14 CN CNA2005100539338A patent/CN1834083A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104549309A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Supported ethylidene diacetate catalyst |
| CN104549309B (en) * | 2013-10-28 | 2017-05-17 | 中国石油化工股份有限公司 | Supported ethylidene diacetate catalyst |
| CN105268486A (en) * | 2014-07-11 | 2016-01-27 | 中国石油化工股份有限公司 | Ethylidene diacetate catalyst and application thereof |
| CN105268486B (en) * | 2014-07-11 | 2017-11-21 | 中国石油化工股份有限公司 | Ethylidene diacetate catalyst and its application |
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