Continuous synthetic method of high-purity p-nitroaniline

• Main Authors: CHU ZHENG, FENG XINLING, XU DONGMEI, YUAN JUNXIU
• Format: Patent
• Language: Chinese; English
• Published: 23.01.2018
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AMMONIA; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS THEREOF; CYANOGEN; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a new process for synthesizing p-nitroaniline. The process comprises: taking p-nitrochlorobenzene and ammonia water as raw materials, in a fixed bed reactor or shell-and-tube reactor and in the presence of a catalyst, carrying out an ammonification reaction to prepare a p-nitroaniline crude product, performing separation recycling to the crude product to prepare p-nitroaniline and obtain ammonium chloride as a by-product, and recycling excess ammonia for cyclic application. According to the process, the p-nitroaniline conversion rate can reach 100%, and the purity of p-nitroaniline can reach 99.9%. The process is green, eco-friendly and new. 本发明提供种对硝基苯胺合成新工艺。该工艺以对硝基氯苯、氨水为原料，在固定床反应器或者列管式反应器中，在催化剂存在的情况下，氨化反应制备对硝基苯胺粗产品，粗产品通过分离回收等工艺制备对硝基苯胺，同时得到氯化铵副产，过量的氨进行回收循环套用，该工艺对硝基氯苯转化率达到100%，对硝基苯胺纯度达到99.9%，是种绿色环保新工艺。