Low-mercury catalyst for synthesizing vinyl chloride and preparation method of low-mercury catalyst

Abstract

The invention discloses a low-mercury catalyst for synthesizing vinyl chloride and a preparation method of the low-mercury catalyst. The low-mercury catalyst comprises the following components in percentage by weight: 2-6.5% of mercuric chloride, 2.2-2.5% of copper chloride, 3-7% of barium chloride, 1-9% of zinc chloride, 2.1-3.5% of nickel chloride, 1.75-6% of potassium chloride, 0.5-6% of magnesium chloride, 0.65-1.25% of strontium chloride, 1.2-1.3% of cadmium chloride, 1-9% of rare earth chloride and the balance of a molecular sieve. The low-mercury catalyst has the beneficial effects that firstly, the content of mercuric chloride is low, namely, only 2-6.5%, the use amount of mercury is reduced, and the production cost is lowered; secondly, the activity and the stability of the low-mercury catalyst are respectively improved by 15% and 20% when being compared with those of a conventional high-mercury catalyst; thirdly, the service life of the low-mercury catalyst is prolonged, namely, is 8000-9000 hours; fourthly, the low-mercury catalyst is simple in preparation method and good in sealing environment-friendly property, and the environment pollution caused by mercury loss can be avoided.

Description

technical field [0001] The invention relates to a low-mercury catalyst for the synthesis of vinyl chloride by addition reaction of hydrogen chloride gas and acetylene gas and a preparation method thereof. The invention belongs to the technical field of synthesizing vinyl chloride. Background technique [0002] Restricted by the resource structure, domestic enterprises mainly use the acetylene method to synthesize vinyl chloride, and the acetylene method mainly uses hydrogen chloride gas and acetylene gas to carry out addition reaction to synthesize vinyl chloride under the action of a catalyst; The way of adsorption is to absorb mercuric chloride, and dry to obtain mercuric chloride catalyst containing 8-12% mercuric oxide. In actual production, because the catalyst does not participate in the reaction product, but is lost due to sublimation and catalyst poisoning, the synthesis of vinyl chloride by the acetylene method requires the consumption of a certain amount of mercur...

AI Technical Summary

Problems solved by technology

[0003] According to the investigation, at present, every ton of vinyl chloride produced in my country needs to consume 1-2Kg of mercury catalysts. The mercury catalysts currently used have the following problems: 1. High mercury content, resource consumption; 2. Poor thermal stability, large consumption and total catalytic time No more than 7000 hours; 3. Due to high mercury content and large loss, some mercury elements enter the atmosphere or water, causing air pollution or environmental pollution