Composite metal salt catalyst for acetylene hydrochlorination

Abstract

Belonging to the technical field of industrial catalysts, the invention in particular relates to a composite metal salt catalyst for acetylene hydrochlorination. The catalyst takes a copper salt loaded on a carbon-based carrier as the main active component, and a synergistic metal or anionic ligand is added to enhance the catalytic activity and stability of the catalyst. In the catalyst, the mass fraction of the copper salt is 1-10%, and the mass fraction of the synergistic metal is 0.5-11.0%. On the basis of maintaining the activity, the prepared catalyst has greatly improved stability, and realizes the purpose of maintaining excellent catalyst performance under the premise of reducing the cetylene hydrochlorination catalyst cost.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysts, and relates to a composite metal salt catalyst used for acetylene hydrochlorination. Background technique [0002] Polyvinyl chloride (PVC) is a widely used synthetic resin material. As the world's largest producer of polyvinyl chloride, China's production of vinyl chloride (vinylchloridemonomer, VCM) mainly relies on the industrial route of acetylene method (also known as calcium carbide method) based on coal resources, which accounts for 70% of the proportion. The core reaction of this route is the hydrochlorination of acetylene, that is, the reaction in which acetylene is added to hydrogen chloride to form vinyl chloride. The equation is as follows: [0003] [0004] For many years, the catalyst required for this reaction is mainly mercuric chloride loaded on activated carbon carrier, wherein the mass fraction of mercury is generally 8%-13%. However, the disadvantages of this...

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Problems solved by technology

In 2013, Wang Feng and others mentioned in the Chinese patent that copper chloride and phosphoric acid were impregnated on the activated carbon carrier step by step, and the obtained catalyst was -1 It can show a conversion rate of 99% at the space velocity, and the catalyst life is 90 hours, which still has a certain distance from industrialization

[0007] Since non-noble metals are often not very active as catalysts for acetylene hydrochlorination, the content of non-noble metals in the catalyst is generally high to meet industrial needs, which easily brings about another problem, that is, the catalyst is prone to appear more obvious Phenomena such as carbon deposition, metal reduction or loss of active components lead to rapid deactivation of the catalyst and the stability cannot be guaranteed

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