Method for reclamation and cyclic utilization of tail gas containing benzene and hydrogenchloride in chlorobenzene production

Abstract

The present invention is process of recovering benzene and hydrogen chloride from tail gas for reuse in benzene chloride production, and belongs to the field of chemical production effluent recovering and utilizing technology. The present invention is one absorption-desorption process, which includes the absorption of hydrogen chloride from the tail gas in an absorption tower at the temperature higher than the boiling temperature of benzene, 80.1 deg.c, with sprayed water or diluted hydrochloric acid to form concentrated hydrochloric acid, and the recovering of benzene from benzene vapor for reuse; and the desorption of concentrated hydrochloric acid in a desorption tower to obtain dry pure hydrogen chloride gas for reuse. The absorption-desorption process can recover benzene and hydrogen chloride from tail gas completely for reuse, and has saving of resource and environment friendship.

Description

technical field [0001] The invention discloses a recovery and recycling method for tail gas containing benzene and hydrogen chloride in the production of chlorinated benzene, which belongs to the field of recovery and utilization of discharges in chemical production processes, and specifically relates to the recovery and utilization of exhaust gases. Background technique [0002] The manufacturers of chlorinated benzene, an organic chemical raw material, are basically built in developing countries, and the recovery of the tail gas containing benzene and hydrogen chloride discharged from their production mostly stays at the low level of the initial release, resulting in waste of resources and environmental pollution. The Chinese patent application "manufacturing Potassium sulfate by-product hydrochloric acid de-analysis co-production PVC resin (200410081404.4) and Chinese patent application " the purification process of hydrogen chloride " (2002100625....

AI Technical Summary

Problems solved by technology

[0002] The manufacturers of chlorinated benzene, an organic chemical raw material, are basically built in developing countries, and the recovery of the tail gas containing benzene and hydrogen chloride discharged from their production mostly stays at the low level of the initial release, resulting in waste of resources and environmental pollution. The Chinese patent application "manufacturing Potassium sulfate by-product hydrochloric acid separation and co-production of PVC resin (200410081404.4) and Chinese patent application "hydrogen chloride purification process" (2002100625.3) disclose the purification and recovery method of the by-product hydrogen chloride produced by the Mannheim process for potassium sulfate

There is no report on the recovery and utilization of the by-product hydrogen chloride containing organic matter, and there is no report on the recovery and utilization of benzene and hydrogen chloride from the tail gas produced from chlorinated benzene

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