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Catalyst for synthesizing acetate propylene ester and preparation method thereof

A technology of propylene acetate and catalyst, 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 slowing down the diffusion speed, increasing the reactivity, and reducing side reactions

Active Publication Date: 2013-04-03
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 catalysts, the thickness of the palladium active layer distributed on the outer layer of the propylene acetate catalyst is about 350 μm, and the method of fixing palladium and copper with inorganic lye alone cannot control the thickness of the active layer within a smaller range.

Method used

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  • Catalyst for synthesizing acetate propylene ester and preparation method thereof
  • Catalyst for synthesizing acetate propylene ester and preparation method thereof
  • Catalyst for synthesizing acetate propylene ester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 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.

[0050] 5% palladium in H 2 PdCl 4 Solution 66 g and 5% copper in CuCl 2 After mixing 15 grams of the solution, dilute it to 1000 ml with deionized water, add 9 grams of chelating agent A, heat the mixed solution to 40-60 °C under stirring, impregnate the above-mentioned alkaline carrier with this solution, shake evenly to avoid agglomeration, Then let it sit for 24 hours.

[0051] 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.

[0052] 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.

[0053] The catalyst precursor was impregnated with 450ml aqueous s...

Embodiment 2

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

Embodiment 3

[0058] 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 acetate propylene ester and its preparation method. The catalyst is provided for solving a first technical problem that a Pd-Cu alloy is thick so that the deep oxidation reaction is aggravated, thereby the reaction activity and selectivity are reduced. The invention also provides the preparation method for solving a second technical problem of the catalyst which is corresponding to solve the first technical problem. A technical scheme that palladium, copper and alkali metal acetate are loaded on a SiO2 carrier as well as the thickness of a Pd-Cu alloy layer is 50-300 mum is better solving the first technical problem, and can be used in industrial production of acetate propylene ester. A technical scheme which is a key process that alkali carriers are immersed by an organic chelating agent composed of a palladium compound and a copper compound is better solving the second technical problem, and can be used in industrial production ofthe acetate propylene ester catalyst.

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 from the reaction of propylene, 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, copper and alkali metal acetate on porous carrier materials such as silicon dioxide and aluminum oxide. [0003] Since the discovery of the process of producing propylene acetate by propylene gas phase method in the 1970s, people have devoted themselves to the research of catalysts with higher reactivity and selectivity, mainly palladium catalysts supported on silica or alumina or their mixtures. In USP3925452, the synthesis of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/04C07C69/15C07C67/055
Inventor 杨运信张丽斌张士福宋朝红秦群英
Owner CHINA PETROLEUM & CHEM CORP