Catalyst for synthesizing isopropenyl acetate and preparation method thereof

A propylene acetate, catalyst technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of high initial catalyst activity, loss of catalyst yield, shortening catalyst problems such as the domestication period to achieve the effect of reducing energy consumption and material consumption

Active Publication Date: 2013-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that the Pd-Cu alloy crystal grains existing in the prior art are too small to cause the initial activity of the catalyst to be too high, so that the catalyst output loss is caused due to a long induction period during the start-up of the catalyst. Provide a new catalyst for the gas phase reaction of propylene, acetic acid and oxygen-containing gas to synthesize propylene acetate. The catalyst has the advantages of effectively inhibiting the initial activity of the catalyst, shortening the acclimation period of the catalyst, and improving production efficiency

Method used

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  • Catalyst for synthesizing isopropenyl acetate and preparation method thereof
  • Catalyst for synthesizing isopropenyl acetate and preparation method thereof
  • Catalyst for synthesizing isopropenyl acetate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare 5% Palladium in H 2 PdCl 4 Solution 66 g and CuCl with 5% copper 215 grams of the solution was diluted to 1000 ml with deionized water, and 1100 ml of spherical silica carrier (particle size 4-6 mm) was taken and immersed at room temperature for 1 hour to prepare a catalyst precursor.

[0042] 27.5 g of sodium silicate nonahydrate was formulated into 100 ml of an aqueous solution and added to the above catalyst precursor, shaken several times to avoid agglomeration, and then allowed to stand for 24 hours.

[0043] The catalyst precursor was impregnated with 30 ml of hydrazine hydrate with a concentration of 85 wt% for reduction, and the impregnation time was 5 hours. The catalyst precursor was washed with deionized water until the effluent was free of chloride ions (checked with silver nitrate), and then dried at 60°C.

[0044] The catalyst precursor was calcined under a nitrogen / acetic acid atmosphere with acetic acid partial pressure of 5% of the total pres...

Embodiment 2

[0048] The catalyst precursor was calcined under an atmosphere of air / acetic acid, wherein the partial pressure of acetic acid accounted for 20% of the total pressure, and the rest were the same as those in Example 1.

Embodiment 3

[0050] The catalyst precursor was calcined in an air / acetic acid atmosphere with acetic acid partial pressure of 20% of the total pressure. The calcination temperature was 300° C., the calcination time was 5 hours, and the rest were the same as those in Example 1.

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Abstract

The invention relates to a catalyst for synthesizing isopropenyl acetate and a preparation method thereof, which mainly solve the problems that in the prior art, the Pd-Cu alloy crystal grains are too small, so the initial activity of the catalyst is too high, the catalyst is in a lower reaction temperature for a long time, the induction period of the catalyst is prolonged, and the yield of the isopropenyl acetate is reduced. The catalyst and the preparation method have the technical scheme that Pd (palladium), Cu (copper) and alkali metal acetates are loaded on silicon dioxide, aluminum oxide or a mixture of the silicon dioxide and the aluminum oxide, and the Pd-Cu alloy crystal grain size is 5 to 15nm. The problems are perfectly solved, and the catalyst and the preparation method can be used for industrial production of isopropenyl acetate catalysts.

Description

technical field [0001] The invention relates to a catalyst for synthesizing propylene acetate by gas-phase reaction of propylene, acetic acid and oxygen-containing gas and a preparation method thereof. Background technique [0002] The production of propylene acetate by the reaction of propylene, acetic acid and an oxygen-containing gas under gas phase conditions in the presence of a catalyst comprising palladium, gold and alkali metal acetate is a well known process. The catalyst used is generally a supported catalyst, and the catalyst is SiO 2 , Al 2 O 3 or SiO 2 with Al 2 O 3 The mixture is a carrier, and the supported active components are metal palladium, metal copper and alkali metal acetate. The catalyst is usually prepared by an impregnation method, and the preparation process mainly includes: impregnating the carrier with a solution of a compound containing palladium and copper to make a catalyst precursor; impregnating the catalyst precursor with an alkaline ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04
Inventor 杨运信张丽斌张士福查晓钟宋朝红秦群英
Owner CHINA PETROLEUM & CHEM CORP
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