A method for treating waste gas produced in the process of producing epichlorohydrin by epoxidation of propylene chloride

Abstract

A method for treating waste gas produced in the process of producing epichlorohydrin by epoxidation of propylene chloride, the method is to treat the waste gas produced in the process of preparing epichlorohydrin by reaction control phase transfer catalyst, hydrogen peroxide, and epoxidation of propylene chloride. The exhaust gas contains nitrogen, oxygen, chloropropene and water vapor. Add nitrogen to the gas phase buffer tank (V1) at the top of the reactor (R1) to dilute the exhaust gas. After dilution, the exhaust gas passes through the primary condenser (E1) and the secondary condenser (E2) 1. The three-stage condenser (E3) reclaims condensed chloropropene and condensed water and then enters the membrane filter (M1) to filter the chloropropene gas, and compresses the chlorpropene gas to recycle the chloropropene; to the membrane filter (M1) filtered out The gas containing inorganic substances is condensed and recovered by the fourth-stage condenser (E4) to recover the trace amount of chloropropene to reach the emission standard.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and particularly relates to a method for treating waste gas generated during the epoxidation of propylene chloride to produce epichlorohydrin. Background technique [0002] Compared with the traditional production process, the process of preparing epichlorohydrin by the epoxidation of reaction-controlled phase transfer catalyst, hydrogen peroxide and propene chloride is a new green and environmentally friendly process, but the tail gas produced in the reaction process contains nitrogen, oxygen, propene chloride and Water vapor is an organic waste gas. With the increasing emphasis on environmental protection in recent years, the treatment of organic waste gas has become an important aspect of economic development and environmental protection. [0003] CN103159703B introduces a method for continuous production of epichlorohydrin by direct epoxidation of chloropropene, and the tail gas produced...

AI Technical Summary

Problems solved by technology

[0003] CN103159703B introduces a method for the direct epoxidation of allyl chloride to continuously produce epichlorohydrin. The tail gas produced by this method is obviously unable to meet the current organic tail gas treatment requirements only by condensing and recovering allyl chloride.

[0004] CN105712955B introduces a process flow for the production of epichlorohydrin by epoxidation of allyl chloride. The tail gas produced by the process is condensed to recover most of the allyl chloride in the tail gas, and then processed by pressurized secondary condensation. The content of allyl chloride in the tail gas ≤0.5v%, it is obviously not able to meet the current organic tail gas treatment requirements

Images