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Preparation method of vinyl ester carboxylic acid

A technology of vinyl carboxylate and vinyl acetate, applied in the field of chemistry, can solve the problems of difficult recovery, high price, causing pollution, etc., and achieve the effects of simple preparation method, low equipment corrosion, and high catalytic activity

Inactive Publication Date: 2012-11-14
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tin catalysts are more difficult to separate and remove completely after the reaction, thus easily causing the reaction product to become darker in color. Therefore, they cannot be used in those occasions that require higher catalyst residues; and organotin catalysts are expensive. It has practical application value in industry, and the problem of repeated reuse of catalyst must be solved
[0007] In the above methods, the catalyst is dissolved in the reactant, which is difficult to recover, not only high cost, but also difficult to post-process, which will cause pollution. Therefore, it is urgent to develop new catalysts that are non-corrosive, non-polluting, and easy to separate.

Method used

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  • Preparation method of vinyl ester carboxylic acid
  • Preparation method of vinyl ester carboxylic acid

Examples

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Embodiment 1

[0029] Weigh 25g of activated carbon and place it in a flask, add 30% HNO 3 The solution was heated and stirred in a water bath at 60°C for 4 hours, the activated carbon in the solution was filtered out, the activated carbon was repeatedly washed with distilled water until the filtrate was neutral, and dried for later use. Weigh 5g of pretreated activated carbon and place it in a flask, and add 50g of distilled water; weigh 0.25g of PdCl 2 , dissolved in concentrated HCl and poured into a flask, stirred and impregnated in a water bath at 80°C for 6h, filtered and washed until the filtrate was neutral, and dried to a constant weight to obtain 1 # Loaded PdCl 2 / C solid catalyst.

Embodiment 2

[0031] Weigh 25g of activated carbon and place it in a flask, add 30% HNO 3 The solution was heated and stirred in a water bath at 60°C for 4 hours, the activated carbon in the solution was filtered out, the activated carbon was repeatedly washed with distilled water until the filtrate was neutral, and dried for later use. Weigh 5g of pretreated activated carbon and place it in a flask, and add 50g of distilled water; weigh 0.25g of PdCl 2 , dissolved in concentrated HCl, poured into a flask, added 0.2g NaCl, stirred and impregnated in a water bath at 80°C for 6h, filtered and washed until the filtrate was neutral, dried the solid to constant weight, and obtained 2 # Loaded PdCl 2 -NaCl / C solid catalyst.

Embodiment 3

[0033] Weigh 25g of activated carbon and place it in a flask, add 30% HNO 3 The solution was heated and stirred in a water bath at 60°C for 4 hours, the activated carbon in the solution was filtered out, the activated carbon was repeatedly washed with distilled water until the filtrate was neutral, and dried for later use. Weigh 5g of pretreated activated carbon and place it in a flask, and add 50g of distilled water; weigh 0.25g of PdCl 2 , dissolved in concentrated HCl and poured into a flask, added 0.2g KCl, stirred and impregnated in a water bath at 80°C for 6h, filtered and washed until the filtrate was neutral, dried the solid to constant weight, and obtained 3 # Loaded PdCl 2 - KCl / C solid catalyst.

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Abstract

The invention provides a preparation method of vinyl ester carboxylic acid. The method comprises in the presence of activated carbon load PdCl2 or an activated carbon load PdCl2-alkali halide solid catalyst, enabling carboxylic acid and vinyl acetate to undergo a vinyl exchange reaction in a backflow state, and obtaining reaction liquid containing corresponding vinyl acetate. According to the method, the catalyst is prepared simply and conveniently, the catalytic activity is high, and the catalyst is separated from a product easily. The preparation method is an efficient, green and environment-friendly production method.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and relates to a method for preparing vinyl carboxylate, in particular to a method for preparing vinyl carboxylate using an activated carbon-loaded catalyst. Background technique [0002] Vinyl carboxylate is an important organic intermediate, because the structure contains active functional groups - double bonds, which can undergo addition and polymerization reactions, and its homopolymers or copolymers are used in adhesives, coatings, antirust agents, etc. Both have applications, unsaturated vinyl carboxylate, can also be used as cross-linking agent, photosensitive resin material. Polymer of higher saturated carboxylic acid vinyl ester (carboxylic acid with 8 to 18 carbon atoms), the more carbon atoms in the carboxylic acid, the softer it is, and it is colorless rubbery with 8 to 12 carbon atoms, with more than 12 carbon atoms It is waxy. Mainly used as a comonomer, copolymerized with vinyl...

Claims

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Application Information

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IPC IPC(8): C07C69/01C07C69/24C07C69/78C07C67/10B01J27/13
Inventor 朱新宝王利娟刘准曹惠庆张虎吴建磊施冠群
Owner NANJING FORESTRY UNIV
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