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Supported ionic liquid catalyst and preparation method and application thereof

A technology of ionic liquids and catalysts, applied in chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve the problem of affecting catalyst activity, life and selectivity, reactants cannot effectively adsorb active sites, and reduce catalyst Selectivity and other issues, to achieve good mass transfer and heat transfer characteristics, strong connection, and improve the effect of service life

Inactive Publication Date: 2010-07-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The shortcoming of above-mentioned two kinds of catalysts is: its carrier pore diameter is all micropores (aperture2 decomposition

Method used

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  • Supported ionic liquid catalyst and preparation method and application thereof
  • Supported ionic liquid catalyst and preparation method and application thereof
  • Supported ionic liquid catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]1) Preparation of imidazole acetate ionic liquid: Add 3.05g (0.025mol) ethyl chloroacetate and 2.7g (0.025mol) allyl imidazole to 50mL acetone, and stir the reaction for 24h at 25°C. Suction filtration, washing with acetone, and vacuum drying at a temperature of 80° C. to obtain 5.1 g (0.022 mol) of ethyl allyl acetate imidazole hydrochloride ionic liquid was used for future use. Dissolve 7.7g (0.1mol) of ammonium acetate in 100mL of glacial acetic acid, add the above hydrochloride ionic liquid, react at 30°C for 24h, filter with suction, wash with acetone, and vacuum dry at 80°C to obtain 4.5g ( 0.02mol) allyl ethyl acetate imidazole acetate ionic liquid.

[0042] 2) Preparation of mesoporous molecular sieves: Add 2g triblock copolymer P123 (Aloririch, template agent) and 4.4g (0.6mol) KCl to 130mL 2mol / L hydrochloric acid, stir until transparent, add 10mL tetraethyl orthosilicate (silicon source), after ultrasonication at 30°C for 10min, move it into a hydrothermal ke...

Embodiment 2

[0047] Replace 3.05g ethyl chloroacetate with 2g (0.025mol) chloroethanol, other reactant weight, reaction condition are identical with embodiment 1, make 7.6g supported ionic liquid catalyst.

Embodiment 3

[0049] Mesoporous molecular sieve MCM-48 was used instead of mesoporous molecular sieve SBA-15, and the weight of other reactants and reaction conditions were the same as in Example 1 to prepare 8.4 g of supported ionic liquid catalyst.

[0050] The preparation method of mesoporous molecular sieve MCM-48 is: in 170mL deionized water, add 9.6g (0.026mol) cetyltrimethylammonium bromide (CTAB, template agent, Beijing Chemical Reagent Company), 200mL absolute ethanol and 80mL of ammonia water (25%), stirred for 10min, then added dropwise 11.7mL of tetraethyl orthosilicate (silicon source) to react for 4h, then used a Soxhlet extractor to extract CTAB with ethanol for 24h, then filtered, dried, and calcined at 300°C for 4h. 3 g (0.048 mol) of mesoporous molecular sieve MCM-48 was obtained.

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Abstract

The invention provides a supported ionic liquid catalyst for preparing vinyl acetate in an acetylene method, the catalyst adopts mesoporous molecular sieve as a carrier and adopts zinc acetate as an active component, and the carrier and the active component are connected by imidazole acetate ionic liquid. The invention further provides a preparation method of the catalyst and an application in preparing the vinyl acetate in the acetylene method. The active component of the zinc acetate of the supported ionic liquid catalyst is bond-coupled on the surface of the carrier in a chemical method and is not easy to be lost in the reaction process; the carrier of the mesoporous molecular sieve provides suitable reaction space for catalytic reaction, and carbon deposition is not easy to be generated; the ionic liquid forms a pseudophase liquid microenvironment on the surface of the catalyst, thus improving the mass transfer and heat transfer in the reaction process; and the catalyst has good stability, long service life, high activity and good selectivity.

Description

technical field [0001] The invention relates to the field of producing vinyl acetate by the acetylene method, in particular to a supported ionic liquid catalyst for producing vinyl acetate by the acetylene method. Background technique [0002] Vinyl acetate (VAc) is a very important organic chemical raw material, and it is one of the 50 largest chemical raw materials in the world. In 1922, Muqaen in Germany discovered that zinc acetate impregnated on activated carbon supports could be used as a catalyst for the synthesis of vinyl acetate, and a vinyl acetate factory with a scale of 12,000 tons / year was established during World War II. After nearly 90 years of development, vinyl acetate was produced through the production of polyacetic acid A series of derivatives such as ethylene, polyvinyl alcohol, and acetal resin have been more and more widely used in the fields of coatings, leather processing, soil improvement, and synthetic fibers. These applications further promote the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/04C07C69/15C07C67/04
Inventor 徐航王金福
Owner TSINGHUA UNIV
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