Oxidation reaction system for preparing 3-amino-4-methoxybenzanilide and control method of oxidation reaction system

Abstract

The invention discloses an oxidation reaction system for preparing 3-amino-4-methoxybenzanilide, which can realize steam heating and condensation cooling in the same jacket, greatly reduce the complexity of heating and cooling equipment of a reaction kettle and reduce the occupied area of the equipment. Nitrogen oxide treatment equipment is tightly attached to the outer side of the reaction kettle, so that the structural integration degree is high; the equipment is close to an exhaust port, long-distance conveying is not needed during waste treatment, gas temperature reduction is avoided, heat energy dissipated out of the reaction kettle can be fully utilized, the catalytic decomposition effect of a nitrogen oxide catalytic decomposition module is improved, and the tail gas safety is improved. The system is further provided with an alkali liquor absorption tank which can absorb nitrogen dioxide and hydrogen chloride gas which are not treated completely, and the tail gas safety is further improved. A controller automatically controls all valves and equipment to automatically complete control and treatment of the whole reaction process and the emergency process, manual operation isnot needed, the efficiency is improved, and meanwhile operators are protected against threats of waste gas, high temperature and explosion hidden dangers.

Description

technical field [0001] The invention belongs to the field of dye compound preparation technology, and in particular relates to an oxidation reaction system for red base KD preparation and a control method thereof. Background technique [0002] The red base KD is a commonly used dye, and its chemical name is 3-amino-4-methoxybenzamide. The main process of its synthesis is benzylation, oxidation, acyl chloride, and o-nitroanisole. Condensation to obtain 4-methoxy-3-nitrobenzoyl chloride, and then condensation with aniline to obtain this product. [0003] Among them, the oxidation process utilizes the reaction of the benzylated material (3-nitro-4 methoxybenzoic acid) produced by the benzylation process with sulfuric acid, formaldehyde, o-nitroanisole, hydrochloric acid and water. The thermal risk analysis shows that : There are two decomposition exothermic peaks, the first decomposition exothermic heat is small, the second decomposition exothermic heat is large, and the poten...

AI Technical Summary

Problems solved by technology

In addition, NO, NO2 and other nitrogen oxides and HCl will be produced during the oxidation process, which needs to be treated in time. However, the existing technology usually collects the waste gas or transfers it to the large-scale waste treatment system of the whole factory through a long pipeline. High consumption, high cost, not conducive to cost saving

Images