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Catalysts used in the synthesis of ethylene vinyl acetate

A method of vinyl acetate and catalyst technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, organic compound preparation, etc., can solve the problem of low activity and selectivity of vinyl acetate catalyst, Achieve the effect of improving activity and stability, improving yield and selectivity

Active Publication Date: 2019-09-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is the low problem of vinyl acetate catalyst activity and selectivity synthesized in the prior art

Method used

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  • Catalysts used in the synthesis of ethylene vinyl acetate
  • Catalysts used in the synthesis of ethylene vinyl acetate
  • Catalysts used in the synthesis of ethylene vinyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Catalyst preparation:

[0037] (1) Using sodium bicarbonate pH regulator and water as a solvent to prepare a pH of 1.09, containing 3.85gPd and 1.87gAu of chloropalladic acid and chloroauric acid aqueous solution to obtain 500ml of impregnation solution, which is impregnated on the carrier in a rotating pot 1.0L of spherical SiO with a diameter of 5.6mm 2 Catalyst precursor I is obtained on the carrier;

[0038] (2) After drying at 80°C, 98ml contains 20.5g Na 2 SiO 3 9H2 The solution of O is fully mixed, aged for 24h to obtain catalyst precursor II;

[0039] (3) With a solubility of 12% (in N 2 h 4 ·H 2 (2 in weight ratio) is reduced by 500ml hydrazine hydrate, washed with water to no chloride ion, and dried at 90° C. to obtain catalyst precursor III;

[0040] (4) Samarium acetate (Sm(OA) containing 1.39gSm C ) 3 ·6H 2 O) 150ml of the aqueous solution is impregnated on the precursor III, vacuum-dried at 110°C, and calcined at 400°C to obtain the catalyst prec...

Embodiment 2

[0047] Catalyst preparation:

[0048] (1) Using sodium bicarbonate pH regulator and water as a solvent to prepare a pH of 1.09, containing 3.85gPd and 1.87gAu of chloropalladic acid and chloroauric acid aqueous solution to obtain 500ml of impregnation solution, which is impregnated on the carrier in a rotating pot 1.0L of spherical SiO with a diameter of 5.6mm 2 Catalyst precursor I is obtained on the carrier;

[0049] (2) After drying at 80°C, 98ml contains 20.5g Na 2 SiO 3 9H 2 The solution of O is fully mixed, aged for 24h to obtain catalyst precursor II;

[0050] (3) With a solubility of 12% (in N 2 h 4 ·H 2 (2 in weight ratio) is reduced by 500ml hydrazine hydrate, washed with water to no chloride ion, and dried at 90° C. to obtain catalyst precursor III;

[0051] (4) Cadmium acetate containing 1.39gCd (Cd(OA C ) 2 2H 2 O) 150ml of the aqueous solution is impregnated on the precursor III, vacuum-dried at 110°C, and calcined at 400°C to obtain the catalyst precu...

Embodiment 3

[0070] Catalyst preparation:

[0071] (1) Using sodium bicarbonate pH regulator and water as a solvent to prepare a pH of 1.09, containing 3.85gPd and 1.87gAu of chloropalladic acid and chloroauric acid aqueous solution to obtain 500ml of impregnation solution, which is impregnated on the carrier in a rotating pot 1.0L spherical Al with a diameter of 5.6mm 2 o 3 Catalyst precursor I is obtained on the carrier;

[0072] (2) After drying at 80°C, 98ml contains 20.5g Na 2 SiO 3 9H 2 The solution of O is fully mixed, aged for 24h to obtain catalyst precursor II;

[0073] (3) With a solubility of 12% (in N 2 h 4 ·H 2 (2 in weight ratio) is reduced by 500ml hydrazine hydrate, washed with water to no chloride ion, and dried at 90° C. to obtain catalyst precursor III;

[0074] (4) Lanthanum acetate (La(OA) containing 1.39gLa C ) 3 ·5H 2 O) 150ml of the aqueous solution is impregnated on the precursor III, vacuum-dried at 110°C, and calcined at 400°C to obtain the catalyst ...

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Abstract

The invention relates to a catalyst used for synthesizing ethylene method produced vinyl acetate. The problems of poor activity and low selectivity of catalysts in the prior art are mainly solved in the invention. The catalyst used for synthesizing ethylene method produced vinyl acetate comprises a carrier, an active component and a cocatalyst; and the carrier adopts SiO2 or Al2O3 or a SiO2 and Al2O3 mixture, the cocatalyst is alkali metal acetate, and the active component comprises metal Pd, metal Au, and at least one metal element selected from lanthanide metals and group IIB metals. The catalyst disclosed in the invention well solves the problems, and can be used in industrial production of the vinyl acetate.

Description

technical field [0001] The invention relates to a catalyst used for synthesizing ethylene-method vinyl acetate, a preparation method of the catalyst and a synthesis method of ethylene-method vinyl acetate. Background technique [0002] Vinyl acetate (VAc) is one of the 50 largest chemical raw materials in the world. Polyvinyl alcohol (PVA), polyvinyl acetate (PVAc) emulsion, and vinyl acetate-ethylene copolymer emulsion can be produced by self-polymerization or copolymerization with other monomers. (VAE) or copolymer resin (EVA), vinyl acetate-vinyl chloride copolymer (EVC) and other derivatives. These derivatives are widely used in adhesives, architectural coatings, sizing agents for paper or fabrics, coatings, inks, leather processing, fiber processing, emulsifiers, water-soluble films, and soil conditioners. The main method of producing ethylene vinyl acetate in the world today is to use ethylene, oxygen and acetic acid as raw materials, and use Pd-Au-KOAc / SiO 2 The sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28C07C67/055C07C69/15
Inventor 查晓钟杨运信
Owner CHINA PETROLEUM & CHEM CORP