Catalyst system for preparing vinyl chloride by hydrochlorinating acetylene and preparation and application thereof

Abstract

The invention discloses a catalyst system for preparing vinyl chloride by hydrochlorinating acetylene, and preparation and application thereof. The catalyst system comprises a catalyst carrier and a catalyst, wherein the catalyst carrier is pyridine ionic liquid, and the catalyst is one or any combination of more than two of tin, palladium, gold, copper, manganese, bismuth, mercury and rhodium. The preparation method for the catalyst system comprises a step of dissolving the catalyst in the catalyst carrier. Acetylene gas and hydrogen chloride gas are mixed and then reacted in the presence of the catalyst system. The preparation process realizes a liquid phase reaction for preparing the vinyl chloride by hydrochlorinating the acetylene, avoids the loss of the catalyst system, is more environment-friendly and safer, and improves the conversion rate of the acetylene and the selectivity of the vinyl chloride.

Description

technical field

[0001] The invention relates to a catalyst system for preparing vinyl chloride by hydrochlorination of acetylene and its preparation and application. Background technique

[0002] Vinyl chloride (VCM) is mainly used to produce polyvinyl chloride (PVC). With the wide application of polyvinyl chloride materials, its demand continues to increase, about 8 to 10 million tons per year. At present, there are three methods for industrial production of vinyl chloride, namely, acetylene hydrochlorination, ethylene oxychlorination, and ethane oxychlorination. Although the technology of ethylene oxychlorination is mature and widely used in foreign countries, due to the rapid rise of oil prices, the price of ethylene has risen, especially in my country, which is rich in coal and has little oil. First, and widely distributed. Considering factors such as cost and process, the acetylene hydrochlorination method will remain the main raw material route for PVC production in m...