Improvement of Production Process for Ortho(para)Chlorobenzaldehyde
Using ortho(para)chlorotoluene and chlorine gas as raw materials,ortho(para)chlorobenzyl and ortho(para)chlorobenzylidene dichloride were synthesized using tower chlorination catalytic reaction distillation technology.The chlorinated solution was subjected to alkaline washing and vacuum distillation to obtain ortho(para)chlorobenzyl,and ortho(para)chlorobenzylidene dichloride was hydrolyzed,alkaline hy-drolyzed,and refined to obtain high-purity ortho(para)chlorobenzaldehyde;This process overcomes the insufficient catalyst activity used in the hydrolysis reaction in the current production process,resulting in long hydrolysis reaction time,severe material polymerization,large residual liquid,low hydrolysis yield,and a large amount of toxic and harmful waste liquid.The yield of chlorination reaction can reach over 98.0%,the total yield of o-chlorobenzyl product is over92%,the total yield of o-chlorobenzaldehyde product is over92%,and the utilization rate of chlo-rine gas can reach over 90.0%.Compared with the same industry in China,it has the characteristics of high product yield,good quality,and low environmental pollution.
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