Method for producing vinyl acetate

Abstract

The present invention uses ethylene, acetic acid and oxygen gas or oxygen-containing gas as raw material, adopts a gas phase reaction method and makes the reaction raw material mixed gas pass through the fixed bed layer consisting of the following described catalyst to make reaction to obtain the vinyl acetate. The carrier of said catalyst is SiO2 or mixture of SiO2-Al2O3, its active component contains Pd and KOAc, and it is formed into shell-type non-unfirom distribution. Said catalyst is a kind of globules, and the radius R of globe body is 2-4 mm, 3-8 grooves whose cross-section is made into the form of arch are cut along the radial direction on the surface of the globe body around the central shaft of the globe body, and the distanced between grooves is greater than 1.5 mm.

Description

technical field [0001] The invention relates to a method for preparing vinyl acetate by gas phase reaction using 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 wit...

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Problems solved by technology

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

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