RECTIFICATION METHOD FOR 3,5-DICHLORO-4-AMINOTRIFLUOROTOLUENE, AND LIGHT TOWER SYSTEM AND RECTIFICATION TOWER SYSTEM USED IN RECTIFICATION METHOD

摘要

Disclosed are a rectification method for 3,5-dichloro-4-aminotrifluorotoluene and a light tower system and a rectification tower system used in the rectification method. The rectification method for 3,5-dichloro-4-aminotrifluorotoluene comprises the following steps: checking each piece of equipment, and performing a pressure test on the systems; adding materials; opening a steam inlet valve of the light tower and a steam trap bypass valve of the light tower to thoroughly drain it of condensed water, opening a steam trap stop valve of the light tower, and closing the steam trap bypass valve of the light tower; refluxing, opening a pre-distillation extraction valve, and extracting to a pre-distillation kettle; and feeding the materials into a rectification tower, refluxing, sampling, and extracting the finished product to a finished product receiving tank. The light tower system comprises the light tower, the pre-distillation kettle and a light tower distillation kettle; and the rectification tower system comprises the rectification tower, a rectification tower distillation kettle and the finished product receiving tank. The present invention has the following beneficial effects: raw materials are saved, the final yield is increased, the amount of kettle residue is greatly reduced, and a considerable economic benefit is obtained; meanwhile, the dangerous solid waste treatment and transfer amounts are reduced, and good environmental benefits are obtained.