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Catalyst for producing vinyl acetate

A catalyst, acetic acid technology, applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Bulk void fraction, high space-time yield, reduced pressure drop loss

Inactive Publication Date: 2003-07-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process, one kind of performance is often improved but another performance is reduced.

Method used

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  • Catalyst for producing vinyl acetate
  • Catalyst for producing vinyl acetate

Examples

Experimental program
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Embodiment Construction

[0022] The present invention will be further described below by some embodiments, in the embodiments: [Examples 1-6] carrier preparation:

[0023] Add extrusion aids and binders to the silica gel powder, mix well, and form the carrier precursor by extrusion. Dry the carrier at room temperature for 48 hours, then dry it at 100°C for 24 hours, and place it in a muffle furnace for 730 °C for 2 hours. After cooling, put it into an autoclave, add a solution made of acetic acid and ammonium acetate, take out the carrier at 165°C and 0.6MPa for 14 hours at constant temperature and pressure, wash it with distilled water until it is neutral, and then roast it at 300°C for 3 hours. After cooling, the desired carrier is obtained. The physical characteristics of the carriers prepared in each embodiment are shown in Table 1. Catalyst preparation:

[0024] With Na containing the equivalent of 6.35 g palladium 2 PdCl 4 and HAuCl equivalent to 2.96 g of gold 4 Prepare 450ml of aqueo...

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Abstract

The present invention relates to a catalyst for preparing vinyl acetate by using ethylene, acetic acid and oxygen gas or oxygen-containing gas as raw material and adopting gas-phase reaction. Its carrier is SiO2 or mixture of SiO2 and Al2O3, and the loaded active component contains Pd and KOAc, the active component is formed into egg-shell type non-uniform distribution, said catalyst is made into spherical granule, radium R of the sphere is 2-4 mm, and surrounding a central shaft of sphere, on the surface of the sphere 3-8 grooves whose cross-section is made into arched form are cut along the longitudinal direction, the groove is extended toward two ends of the central shaft from middle portion of the sphere and progressively exposed from surface of the sphere, and the distanced between grooves is greater than 1.5 mm. Said catalyst has high crushing strength, larger packing voidage and proper specific surface area.

Description

technical field [0001] The invention relates to a catalyst for preparing vinyl acetate by gas phase reaction with ethylene, acetic acid and oxygen or oxygen-containing gas as raw materials. Background technique [0002] In the reaction of preparing vinyl acetate by gas phase reaction using ethylene, acetic acid and oxygen or oxygen-containing gas as raw materials, the suitable catalyst is that the active component contains Pd and KOAc, and may contain Au, Ba, Cd, or their corresponding salts class of compounds. These active components are usually supported on SiO 2 , or SiO 2 with Al 2 o 3 on the mixture. The active components of this type of catalyst have already matured. After the 1970s, people mostly studied the distribution of the active components on the carrier, and the active components were egg yolk, egg white and eggshell. Etc. Non-uniform distribution of the catalyst is pushed out. The apparent activity, selectivity and anti-poisoning ability of catalysts wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J31/04
Inventor 杨运信张丽斌姚建东宋朝江孙春华
Owner CHINA PETROLEUM & CHEM CORP
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