Production method of heavy metal ion polymeric chelating agent

• Main Authors: DONG JUNHAO, ZHANG GONGXIAO, ZHANG DONGSHENG, CUI MENG, YANG RONGHUA, GUO XIANGRONG, MENG XIANFENG
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2017
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention provides a production method of a heavy metal ion polymeric chelating agent. The method includes the steps of feeding and adjustment of dropwise addition speed and temperature of carbon disulfide. In the feeding step, the molar ratio of polyethyleneimine to carbon disulfide is 1:(0.538-0.588), the catalyst, namely 4-dimethylaminopyridine, accounts for 0.04-0.18% of the weight of polyethyleneimine, and the catalyst, namely N-(3-dimethulaminopropyl)-N'-ethylcarbodiimide hydrochloride, accounts for 0.09-0.23% of the weight of polyethyleneimine. The density of the produced chelating agent is 1.07-1.13 g/ml at 25 DEG C, the pH value (10% aqueous solution) is 10.5-11.4, the viscosity of the chelating agent is 80-90 mPa.s at 25 DEG C, the low-temperature stability is good, and the heat resistance is good. The method is used for treatment of various heavy metal ions, and the removal effect is remarkable. 本发明提供种广谱型重金属离子高分子螯合剂的生产方法，包括加料，调节二硫化碳滴加速度、温度；所述加料，聚乙烯亚胺与二硫化碳的摩尔比为1：0.538-0.588；催化剂4-二甲氨基吡啶用量为聚乙烯亚胺重量