Technique for coproducing polyvinyl chloride from by-product hydrogen chloride of trichloroethylene

• Main Authors: WANG JIE, HUANG DALI, LIU DINGWEN, XIE NANJIE, LI YING
• Format: Patent
• Language: Chinese; English
• Published: 02.07.2008
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a production technology of trichloroethylene, with HCL as by-product and polyvinyl chloride as co-product, which is applicable to the corporations for producing chlor-alkali, calcium carbide process (PVC) and trichloroethylene, aiming at solving the difficult problem of recycling and processing byproduct HCL in the existing trichloroethylene production. A refining process is done to the HCL; the separated chlorohydrocarbon is directly sent to the distillation system of trichloroethylene; the HCL gas after the refining process can meet the technology requirement for HCL of VCM synthesis in PVC production in terms of gas purity, chlorohydrocarbon content and pressure; after five steps of chlorohydrocarbon rough separation, effective collection, adsorption in adsorbing tower, and so on, the HCL meets technology requirement; the qualified HCL, after being cooled and pressured, is sent to carry out VCM synthesis, which solves the problem of the HCL retraction mixing with chlorohydrocarbon,