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Vinyl acetate catalyst and vinyl acetate synthesis method

A vinyl acetate, catalyst technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as low catalyst selectivity

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technologies to be solved by the present invention is the technical problem of low selectivity of catalysts prepared in the prior art, and a catalyst for the synthesis of vinyl acetate by ethylene method is provided, which has better activity and selectivity

Method used

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  • Vinyl acetate catalyst and vinyl acetate synthesis method
  • Vinyl acetate catalyst and vinyl acetate synthesis method
  • Vinyl acetate catalyst and vinyl acetate synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 1. Catalyst preparation

[0059] (a) Take 1100ml spherical silica carrier (diameter is 5mm, specific surface is 175m 2 / g, the pore volume is 0.8cm 3 / g) is immersed in chloropalladic acid, chloroauric acid mixed aqueous solution, calculates according to solid-liquid volume ratio is 1:1.2, wherein the content of palladium in the solution used is 2.75g / L, and the content of gold is 0.625g / L, gets Catalyst precursor I;

[0060] (b) Add 100ml sodium silicate aqueous solution (27.5g Na 2 SiO 3 9H 2 O is configured as 100ml aqueous solution), mixed uniformly and left to stand for 24 hours, then dried at 80°C for 8 hours to obtain catalyst precursor II;

[0061] (c) The catalyst precursor II was reduced in a hydrogen / carbon dioxide atmosphere. The volume ratio of hydrogen to carbon dioxide is 3:7, the flow rate of the mixed gas is 0.2ml / min, the pressure is 0.5MPa, the reduction temperature is 200°C, and the reduction time is 3 hours to obtain the catalyst precursor III...

Embodiment 2

[0074] 1. Catalyst preparation

[0075] (a) Take 1100ml spherical silica carrier (diameter is 5mm, specific surface is 175m 2 / g, the pore volume is 0.8cm 3 / g) is immersed in chloropalladic acid, chloroauric acid mixed aqueous solution, calculates according to solid-liquid volume ratio is 1:1.2, wherein the content of palladium in the solution used is 2.75g / L, and the content of gold is 0.625g / L, gets Catalyst precursor I;

[0076] (b) Add 100ml sodium silicate aqueous solution (27.5g Na 2 SiO 3 9H 2 O is configured as 100ml aqueous solution), mixed uniformly and left to stand for 24 hours, then dried at 80°C for 8 hours to obtain catalyst precursor II;

[0077] (c) The catalyst precursor II was reduced in a hydrogen / carbon dioxide atmosphere. The volume ratio of hydrogen to carbon dioxide is 1:9, the flow rate of the mixed gas is 0.2ml / min, the pressure is 0.5MPa, the reduction temperature is 200°C, and the reduction time is 3 hours to obtain the catalyst precursor III...

Embodiment 3

[0083] 1. Catalyst preparation

[0084] (a) Take 1100ml spherical silica carrier (diameter is 5mm, specific surface is 175m 2 / g, the pore volume is 0.8cm 3 / g) is immersed in chloropalladic acid, chloroauric acid mixed aqueous solution, calculates according to solid-liquid volume ratio is 1:1.2, wherein the content of palladium in the solution used is 2.75g / L, and the content of gold is 0.625g / L, gets Catalyst precursor I;

[0085] (b) Add 100ml sodium silicate aqueous solution (27.5g Na 2 SiO 3 9H 2 O is configured as 100ml aqueous solution), mixed uniformly and left to stand for 24 hours, then dried at 80°C for 8 hours to obtain catalyst precursor II;

[0086] (c) The catalyst precursor II was reduced in a hydrogen / carbon dioxide atmosphere. The volume ratio of hydrogen to carbon dioxide is 2:8, the flow rate of the mixed gas is 0.2ml / min, the pressure is 0.5MPa, the reduction temperature is 200°C, and the reduction time is 3 hours to obtain the catalyst precursor III...

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Abstract

The invention relates to an ethylene method vinyl acetate catalyst, and mainly solves the problem of low selectivity of the existing catalyst. According to the technical scheme, the vinyl acetate catalyst comprises a carrier, Pd, Au and alkali metal acetate, the Pd, the Au and the alkali metal acetate are loaded on the carrier, the peak positions of Au (4f) in the X-ray photoelectron spectroscopy of the catalyst are 86.2-87.4 eV and 82.4-83.7 eV, the technical problem is well solved, and the catalyst can be used for industrial production of vinyl acetate.

Description

technical field [0001] The invention relates to an ethylene method vinyl acetate catalyst, a preparation method thereof and a vinyl acetate synthesis method. Background technique [0002] As an important organic monomer, vinyl acetate (Vinyl Acetate VAc) is a synthetic polyvinyl alcohol (PVA), polyvinyl acetate (PVA), ethylene-vinyl acetate copolymer resin (EVA), vinyl acetate-vinyl chloride copolymer ( EVC) and polypropylene comonomer are important raw materials for chemical products, and are widely used in synthetic fibers, leather processing, films, vinylon, adhesives, coatings and other fields. Among them, the ethylene gas-phase method is one of the most important methods for industrially producing VA at present, which has the advantages of high energy utilization rate and low environmental hazards. Especially in recent years, with the opening up of the technical route of ethanol from biomass and further dehydration to ethylene, the gas phase synthesis of VAc from ethyl...

Claims

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Application Information

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IPC IPC(8): B01J35/10B01J31/04B01J23/52B01J23/44B01J37/03B01J37/18B01J37/02C07C67/055C07C69/15
CPCB01J31/04B01J23/52B01J23/44B01J37/031B01J37/18B01J37/0201C07C67/055B01J2231/32B01J35/613B01J35/615C07C69/15
Inventor 孙浩洋刘燕杨运信张丽斌
Owner CHINA PETROLEUM & CHEM CORP
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