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Preparation method of supported catalyst for synthesizing vinyl acetate

A technology of supported catalyst and vinyl acetate, which is applied in the field of preparation of supported catalysts and can solve problems such as loss of catalyst activity

Active Publication Date: 2005-08-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 5,968,869 proposes that the carrier supports metal copper before loading other active components, and the obtained catalyst can reduce the proportion of carbon dioxide in the product, but the disadvantage is that the activity of the catalyst seems to be lost

Method used

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  • Preparation method of supported catalyst for synthesizing vinyl acetate
  • Preparation method of supported catalyst for synthesizing vinyl acetate

Examples

Experimental program
Comparison scheme
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Embodiment 1～4

[0040] Take 1.1 liters of spherical silica carrier (particle size 4-6mm), and use 2.92 grams of CuCl 2 2H 2 Soak in 450 ml of aqueous O solution for 1 hour at room temperature.

[0041] 7.32g of sodium silicate nonahydrate was made into 100ml of aqueous solution and added to the above-mentioned carrier, shaken several times to avoid agglomeration, and then stood still for 24 hours.

[0042] 10 ml of hydrazine hydrate with a concentration of 85 wt % was used to impregnate the carrier for reduction, and the impregnation time was 5 hours.

[0043] The catalyst precursor was washed with deionized water until the effluent did not contain chloride ions (checked with silver nitrate), and then dried at 60° C. to obtain the catalyst precursor.

[0044] The catalyst precursor is calcined under an inert or reducing atmosphere, and the specific calcining conditions of each embodiment are shown in Table 1.

[0045] with 4.21 g of H 2 PdCl 4 and 2.04 g HAuCl 4 450 milliliters of the m...

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Abstract

A carried catalyst for preparing vinyl acetate from ethane, acetic acid and oxygen contained gas is composed of the carrier (SiO2 and / or Al2O3) and active component (Pd, Au, Cu and alkali-metal acetate). It is prepared through immersing carrier in the aqueous solution of Cu compound, ageing, converting Cu compound to Cu, washing, drying, calcining in protective atmosphere, immersing in the solution of Pd and Au compounds, ageing, converting the Pd and Au compounds to Pd and Au, and immersing in the aqueous solution of alkali metal acetate.

Description

technical field [0001] The invention relates to a preparation method of a supported catalyst for synthesizing vinyl acetate by gas-phase reaction of ethylene, acetic acid and oxygen-containing gas. The active component of the catalyst contains metal palladium, metal gold and metal copper. Background technique [0002] In the presence of a catalyst, the synthesis of vinyl acetate by gas-phase reaction of ethylene, acetic acid and oxygen-containing gas is a relatively mature method for the industrial production of vinyl acetate. The catalyst used is generally a supported catalyst, and the carrier is usually SiO 2 or Al 2 o 3 , or for SiO 2 with Al 2 o 3 The active components usually include metal palladium, metal gold and alkali metal acetate. Catalysts are generally prepared by an impregnation method. The catalyst obtained by this traditional preparation method can obtain higher catalytic activity, but it is also accompanied by the generation of by-product carbon dioxide...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J31/04C07C67/055C07C69/15
Inventor 姚建东杨运信张丽斌宋朝红
Owner CHINA PETROLEUM & CHEM CORP
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