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Method for preparing vinyl acetate from ethylidene diacetate through pyrolysis

A technology of ethylene diacetate and vinyl acetate, applied in the field of preparation of vinyl acetate, can solve the problems of difficulty in separating product and catalyst, affecting the purity of VAC, etc.

Active Publication Date: 2015-07-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Find through experiment: when adopting arylsulfonic acid compound (particularly benzenesulfonic acid) to carry out cracking reaction as catalyst, the separation of product (VAC) and catalyzer is very difficult (like this, will affect the purity of VAC)
In addition, when adopting arylsulfonic acid compound (particularly benzenesulfonic acid) to carry out EDA cracking reaction to prepare VAC as catalyst, described cracking reaction selectivity still has room for improvement

Method used

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  • Method for preparing vinyl acetate from ethylidene diacetate through pyrolysis
  • Method for preparing vinyl acetate from ethylidene diacetate through pyrolysis
  • Method for preparing vinyl acetate from ethylidene diacetate through pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 1g of AlCl 3 Add in 50ml absolute ethanol, accurately weigh commercially available macroporous styrene cation exchange resin (D006 type resin) 7g, simultaneously mix D006 type resin and AlCl 3 Add the solution into a three-necked flask, insert a condenser tube and a thermometer into the three-necked flask, adjust the temperature of the constant temperature magnetic stirrer and the heating mantle, keep it at 40°C-50°C for 20-24 hours, filter, and use deionized water and Wash with acetone until there is no chloride ion (AgNO can be used 3 solution cannot be detected), the washed resin is dried in a vacuum oven to constant weight (drying temperature is preferably 80 ° C), and AlCl 3 Modified macroporous styrene cation exchange resin, its parameters are shown in Table 1.

[0017] Table 1

[0018]

Embodiment 2

[0020] Take by weighing ethylene diacetate 120g, the AlCl prepared by embodiment 1 3 Modified macroporous styrene cation exchange resin (catalyst) 2.6g, joins in the 500ml there-necked flask, at normal pressure (1atm) and temperature is 140 ℃, the state keeps 1.5h, the product adopts gas chromatographic analyzer to carry out data analysis Analysis and processing, the results are shown in Table 2,

[0021] Gas chromatographic column: stationary phase HP-5, FID, vaporization temperature 250°C, column temperature initial temperature 50°C, temperature programmed to 250°C at 8°C / min.

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Abstract

The invention relates to a method for preparing vinyl acetate (VAC) from ethylidene diacetate (EDA) through pyrolysis. The method mainly comprises the following step: in the presence of a catalyst, performing thermal pyrolysis on EDA so as to obtain VAC. The method is characterized in that the catalyst is aluminum trichloride modified macropore styrene cation exchange resin, and aluminum trichloride accounts for 0.1-3.0wt% of the total weight of the catalyst. When VAC is prepared by using the method provided by the invention, not only is the VAC easily separated from the catalyst, but also the conversion rate of EDA can be increased, and the selectivity of VAC can be relatively greatly improved.

Description

technical field [0001] The present invention relates to a kind of preparation method of vinyl acetate (vinyl acetate, abbreviated as VAC), specifically, relate to a kind of method for preparing vinyl acetate by cracking ethylidene diaceate (abbreviated as EDA) . Background technique [0002] Vinyl acetate (also referred to as vinyl acetate) is a very important organic chemical raw material. The molecular structure of vinyl acetate contains carbon-carbon unsaturated bonds. Such molecular structure characteristics enable vinyl acetate to undergo copolymerization or self-polymerization with many monomers, and then form various polymers with unique properties, such as: vinyl acetate-acrylonitrile Fiber, vinyl acetate-vinyl chloride copolymer, polyvinyl acetate, etc. This kind of polymer product has extremely important uses in industry and life, and is widely used in chemical industry, construction, automobile, light industry, textile and other industries. [0003] GB 2013184A...

Claims

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Application Information

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IPC IPC(8): C07C69/15C07C67/297C07C51/09C07C53/08C07C27/00
CPCC07C51/09C07C67/297C07C69/15C07C53/08
Inventor 刘殿华张建强房鼎业胡益共
Owner EAST CHINA UNIV OF SCI & TECH
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