Acetylene hydrochlorination ultra-low mercury catalyst as well as preparation method and application thereof

Abstract

The invention discloses an acetylene hydrochlorination ultra-low mercury catalyst and a preparation method and application thereof. The catalyst is composed of HgCl2, CuCl2, ZnCl2, KCl and succinimide and prepared in the mode of solution dilution dipping and stepped heating drying, and the catalyst has the advantages of being low in mercuric chloride content, high in effective mercuric chloride content, multiple in active point location, high in dispersity, stable in valence state of catalytic active components, high in carbon deposition resistance and long in service life.

Description

technical field [0001] The invention relates to the technical field of the addition reaction of acetylene and hydrogen chloride, in particular to a catalyst for the addition reaction of acetylene and hydrogen chloride. Background technique [0002] Mercury is a heavy metal, commonly known as "mercury", which is a poisonous substance. On January 19, 2013, the United Nations Environment Program adopted the Minamata Convention, an international convention aimed at controlling and reducing mercury emissions on a global scale. damage, the Convention came into effect on August 16, 2017, and China, as the first party to join the Convention, will begin to implement the provisions of the Convention nationwide and undertake the responsibilities and tasks for performance. Regarding the production process of calcium carbide polyvinyl chloride, the Convention proposes many The Ministry of Environmental Protection and the United Nations Industrial Development Organization (UNIDO) officia...

AI Technical Summary

Problems solved by technology

[0004] The main reasons for the deactivation of ultra-low mercury catalysts in acetylene hydrochlorination are as follows: ①In industrial applications, the actual operating temperature is 100-200°C, and mercury chloride is a molecular crystal, which is easy to cause the sublimation of mercury chloride, and the mercury chloride content decreases, the catalytic active sites decrease, and the catalytic conversion rate decreases; ② carbon deposition, the reactants of the catalyst are acetylene and hydrogen chloride, acetylene is prone to self-polymerization, and the self-polymer covers the catalytic active sites, leading to catalyst deactivation; ③ chlorine Mercury valence transition of mercuric, in the production and application, the reducing functional groups on the activated carbon and the reactant acetylene are easy to reduce mercuric chloride to mercurous chloride and metallic mercury, resulting in a decrease in catalytic activity