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Catalyst for synthesizing vinyl acetate by ethylene method and preparation method thereof

A vinyl acetate and catalyst technology, applied in the field of ethylene gas phase vinyl acetate catalyst, can solve the problems of low space-time yield and selectivity of the catalyst, and achieve the effects of increased selectivity, enhanced selectivity, and good technical effects

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is the problem of low space-time yield and selectivity of the catalyst in the prior art, and a new vinyl acetate catalyst is provided, which has the characteristics of high space-time yield and selectivity

Method used

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  • Catalyst for synthesizing vinyl acetate by ethylene method and preparation method thereof
  • Catalyst for synthesizing vinyl acetate by ethylene method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Catalyst preparation

[0030] (a) Take H 2 PdCl 4 and HAuCl 4 1000ml of the aqueous solution is the impregnation solution (palladium content: 2.75g / L, gold content: 0.625g / L), impregnating 1100ml of spherical silica carrier with a diameter of 5.8mm (BET specific surface 175cm 2 / g, the pore volume is 0.7cm 3 / g) 3hr to obtain catalyst precursor I;

[0031] (b) 27.5gNa 2 SiO 3 9H 2 O was made into 100ml aqueous solution and added to the above-mentioned catalyst precursor I, shaken several times to avoid agglomeration, allowed to stand for 24 hours, and then dried at 80°C for 8 hours to obtain catalyst precursor II;

[0032] (c) Catalyst precursor II was reduced in a hydrogen atmosphere (flow rate of 0.2ml / min, temperature of 150°C) for 2 hours and then lowered to room temperature to obtain catalyst precursor III;

[0033] (d) Take 450ml of a mixed solution of methanol and water containing KOAc and methyl benzoate (the weight percentage of methanol and water is ...

Embodiment 2

[0047] [Example 2] to [Example 6]

[0048] Except for changing the type of co-catalyst aromatic acid ester in the catalyst preparation process, other operating steps and evaluation conditions were the same as in Example 1. For the convenience of comparison, the catalyst preparation conditions are listed in Table 1, and the catalyst evaluation conditions and characterization evaluation results are listed in Table 2.

Embodiment 7

[0050] (1) Catalyst preparation

[0051] (a) Take H 2 PdCl 4 and HAuCl 4 1000ml of the aqueous solution is the impregnation solution (palladium content: 2.75g / L, gold content: 0.625g / L), impregnating 1100ml of spherical silica carrier with a diameter of 5.8mm (BET specific surface 175cm 2 / g, the pore volume is 0.7cm 3 / g) 3hr to obtain catalyst precursor I;

[0052] (b) 27.5gNa 2 SiO 3 9H 2 O was made into 100ml aqueous solution and added to the above-mentioned catalyst precursor I, shaken several times to avoid agglomeration, allowed to stand for 24 hours, and then dried at 80°C for 8 hours to obtain catalyst precursor II;

[0053] (c) Catalyst precursor II was reduced in a hydrogen atmosphere (flow rate of 0.2ml / min, temperature of 150°C) for 2 hours and then lowered to room temperature to obtain catalyst precursor III;

[0054] (d) Take 450ml of a mixed solution of methanol and water containing KOAc, methyl benzoate and dimethyl phthalate (the weight percentage of ...

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Abstract

The invention relates to a catalyst for synthesis of vinyl acetate by ethylene method and its preparation method, and mainly solves the problem of low space-time yield and low selectivity of catalysts in the prior art. The catalyst is a catalyst used for synthesis of the vinyl acetate by the ethylene method, and comprises a carrier, an active component and a coatalyst, the carrier is SiO2, Al2O3, or their mixture, the active component is metal palladium and metal gold, and the coatalyst is potassium acetate and an aromatic ester; and by use of the technical scheme, the problem of the low space-time yield and low selectivity of the catalysts in the prior art can be solved. The catalyst can be used for industrial production of synthesis of the vinyl acetate by the ethylene method.

Description

technical field [0001] The invention relates to a vinyl acetate catalyst for ethylene gas phase method, a preparation method of the catalyst, and a synthesis method of vinyl acetate. Background technique [0002] Well-known industrial methods for preparing vinyl acetate are mainly divided into two categories, one is the ethylene method, that is, ethylene, acetic acid and oxygen are realized by gas phase reaction in the presence of a supported Pd-Au catalyst, and the other is acetylene and acetic acid in acetic acid The reaction was carried out in the presence of a zinc catalyst. [0003] A preferred vinyl acetate catalyst for the ethylene process is on a carrier material such as SiO 2 、Al 2 o 3 A certain amount of Pd metal and Au metal is supported on the surface of its composite. Its preparation method is generally a standard method for preparing vinyl acetate catalysts containing Pd and Au dispersed on a catalyst support, including: (1) impregnating the support with an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28C07C69/15C07C67/055
Inventor 邱鹏远杨运信张丽斌
Owner CHINA PETROLEUM & CHEM CORP