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本发明涉及乙醛酸的化学合成方法,具体涉及一种多级反应制备乙醛酸的方法及装置。本发明的方法将第一反应器产生的尾气直接通入第二反应器中,回收利用了其中的有效成分,使第二反应器中反应体系更稳定,反应更完全,转化率和收率均有显著提高,降低了主要原料乙二醛的单耗;本发明的方法将尾气直接回收利用,从而提高了原料回收利用率,使整个系统的硝酸、盐酸单耗以及废气产量明显降低;本发明的方法由于废气产量减少,同时废气中有害物质含量降低,从而简化废气处理步骤。
The present invention relates to a method for chemical synthesis of glyoxylic acid, in particular to a method and an apparatus for preparing glyoxylic acid by a multi-stage reaction. The method of the invention directly feeds the tail gas generated from the first reactor into the second reactor, recycles the active ingredients therein, makes the reaction system in the second reactor more stable, the reaction is more complete, the conversion rate and the yield are both The consumption of nitric acid, hydrochloric acid and exhaust gas of the whole system is remarkably reduced; the unit consumption of the main raw material glyoxal is reduced; the method of the invention directly recycles the exhaust gas, thereby improving the recovery rate of the raw materials; The method simplifies the exhaust gas treatment step due to the reduction of the exhaust gas production while reducing the amount of harmful substances in the exhaust gas.