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Catalyst for synthesizing vinylacetate and preparation method thereof

A vinyl acetate and catalyst technology, applied in the field of catalyst and its preparation, can solve the problem of inability to control the thickness of the active layer, and achieve the effects of improving the reaction activity and selectivity, improving the utilization rate, and reducing the secondary oxidation reaction

Active Publication Date: 2011-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of commercialized domestic and foreign catalysts, the thickness of the palladium active layer distributed on the outer layer of the vinyl acetate catalyst is about 350 μm, and the method of fixing palladium gold with inorganic lye alone cannot control the thickness of the active layer in a smaller range. Inside

Method used

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  • Catalyst for synthesizing vinylacetate and preparation method thereof
  • Catalyst for synthesizing vinylacetate and preparation method thereof
  • Catalyst for synthesizing vinylacetate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 1.1 liter of spherical silica carrier (particle size 4-6 mm), soak it with 450 ml of aqueous solution containing 27.5 g of sodium silicate nonahydrate for 1 hour, and dry it at 60°C.

[0048] with 2.99 g of PdCl 2 and 1.82 g AuCl 3 Add 9 g of ethylenediaminetetraacetic acid disodium salt (EDTA disodium salt) or chelating agent A to 450 ml of the mixed solution, heat the mixed solution to 40-60°C under stirring, impregnate the above-mentioned alkaline carrier with this solution, and evenly Shake to avoid lumps, then let sit for 24 hours.

[0049] The catalyst precursor was impregnated with 30 ml of hydrazine hydrate with a concentration of 85 wt % for reduction, and the impregnation and reduction time was 5 hours.

[0050] The catalyst precursor was washed with deionized water until the effluent did not contain chloride ions (tested with silver nitrate), and then dried at 60°C.

[0051] The catalyst precursor was impregnated with 450ml aqueous solution containing...

Embodiment 2

[0054] Adopt chelating agent B to replace chelating agent A, all the other are with embodiment 1.

Embodiment 3

[0056] Adopt chelating agent C to replace chelating agent A, all the other are with embodiment 1.

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Abstract

The invention relates to a catalyst for synthesizing vinylacetate and a preparation method thereof, and mainly solves the problem that reaction activity and selectivity are reduced because a palladium-gold active ingredient layer in a catalyst is thick to intensify deep oxidation reaction in the prior art. In the catalyst for synthesizing the vinylacetate by ethylene, ethylic acid and oxygen-containing gas through gas-phase reaction, SiO2, Al2O3 or a mixture thereof is taken as a carrier, and active ingredients selected from palladium metal, gold metal and alkali metal acetate are loaded on the carrier, wherein based on the weight of the catalyst, the palladium content is 1-12 grams / liter, the gold content is 0.5-10 grams / liter and the alkali metal acetate content is 10-80 grams / liter; and the Pd and Au alloy layer in the catalyst has the thickness of less than 300 mu m. The invention also provides a preparation method for the catalyst. By the technical scheme, the problem is better solved; and the catalyst can be used in industrial preparation of the vinylacetate by using ethylene, ethylic acid and oxygen-containing gas.

Description

technical field [0001] The invention relates to a catalyst for synthesizing vinyl acetate by gas-phase reaction of ethylene, acetic acid and oxygen-containing gas and a preparation method thereof. Background technique [0002] The present invention relates to the preparation of catalyst, in particular to the preparation of palladium and gold catalyst used when producing vinyl acetate from ethylene, acetic acid and oxygen-containing gas. [0003] The production of vinyl acetate from the reaction of ethylene, acetic acid and an oxygen-containing gas in the gas phase in the presence of a catalyst comprising palladium, gold and an alkali metal acetate is a well known process. The catalyst is generally a supported catalyst, which is prepared by loading palladium, gold and alkali metal acetate on a porous carrier material such as silicon dioxide, aluminum oxide and the like. [0004] Since the discovery of the process of producing vinyl acetate by ethylene gas phase method in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J31/04B01J37/02C07C69/15C07C67/055
Inventor 杨运信张士福查晓钟张丽斌宋朝红秦群英
Owner CHINA PETROLEUM & CHEM CORP
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