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制造 K_2CO_3的恩格尔—普雷契特方法由于经济和技术上的原因,在德国已被弃之不用。本工作试图查明和解决过程的控制问题,并提供改变原始的间歇操作为连续流程所必须的动力学数据。研究了两个反应:即恩格尔盐(KHCO_3·MgCO_3·4H_2O)的生成反应和该不溶性盐分解为 KHCO_3溶液和 MgCO_3·3H_2O 固相的反应。在研究反应最佳条件的同时,还确定了恩格尔盐生成反应(KCO,CO_2和MgCO_3·3H_2O 在水溶液料浆中的反应)的动力学和机理。对恩格尔盐分解的动力学、机理和最佳条件也同样地做了测定。本文完成了恩格尔—普雷契特方法中所有反应的研究,并与以前两次发表的结果(MgO 的水合和 MgO 的碳化)一起提出了关于设计一个有效的连续的流程所需要的所有数据。
The ENGEL-PRITCH method of manufacturing K 2 CO 3 has been abandoned in Germany for economic and technical reasons. This work attempts to identify and address process control issues and provide kinetic data necessary to change the original intermittent operation into a continuous process. Two reactions were studied: the formation of the Engel salt (KHCO 3 · MgCO 3 · 4H 2 O) and the reaction of the insoluble salt decomposing into the KHCO 3 solution and the MgCO 3 · 3H 2 O solid phase. The kinetics and mechanism of the Engel’s salt formation reaction (reaction of KCO, CO 2 and MgCO 3 · 3H 2 O in aqueous slurry) were also determined. The kinetics, mechanism and optimum conditions for the Engel’s salt decomposition were similarly determined. This article has completed the study of all reactions in the ENGEL-PRITCHET method and, together with the two previously published results (hydration of MgO and carbonization of MgO), presents all the data required for designing an efficient continuous process.