METHOD FOR PREPARING VINYL CHLORIDE WITH ACETYLENE AND DICHLORETHANE

摘要

Provided is a method for preparing vinyl chloride with acetylene and dichlorethane for large-scale industrial production. Acetylene, dichlorethane vapor and hydrogen chloride gas at a molar ratio of 1:(0.3-1.0):(0-0.20) are mixed; the raw mixed gas is preheated; the preheated raw mixed gas passes through a reactor containing a catalyst and reacts; the resultant mixed gas is cooled to 30-50° C. and pressurized to 0.4-1.0 MPa, and then cooled to ambient temperature, and further frozen to −25-15° C. for liquefaction isolation, and unliquefied gas is recycled and reused; liquefied liquid is sent to a rectifying tower for rectification, and vinyl chloride monomers meeting polymerization requirements are obtained. The present invention has the advantages of eliminating mercury contamination completely, simplifying the reactor structure, recycling hydrogen chloride and acetylene, reducing waterwash process, avoiding mass production of waste acid and improving utilization of chlorine.

主权项

1. A method for preparing vinyl chloride with acetylene and dichlorethane, characterized in that, it comprises the following steps:
1) acetylene, dichlorethane vapor and hydrogen chloride gas are mixed, and the acetylene, dichlorethane and hydrogen chloride are adjusted with a molar ratio of 1:(0.3-1.0):(0-0.20), to obtain a raw mixed gas; 2) the raw mixed gas is preheated; 3) the preheated raw mixed gas pass through a reactor containing a catalyst to perform reaction; 4) the resultant mixed gas in step 3) is cooled to 30-50° C. and pressurized to 0.4-1.0 MPa, and then cooled to ambient temperature, and further frozen to −25-15° C. for liquefaction isolation, and unliquefied gas is recycled and reused; 5) the liquefied liquid in step 4) is sent to a rectifying tower for rectification, and vinyl chloride monomers meeting polymerization requirements are obtained, i.e., the vinyl chloride is obtained.