螯合捕收剂烃基丙二酸的合成研究

A Chelating Collector on Synthesis of Alkyl Malonic Acid

选用四丁基溴化铵为催化剂,在无水碳酸钾碱性条件下,以丙二酸二乙酯和卤代烃为原料,采用相转移催化法合成出烃基丙二酸类化合物,作为氧化铅锌矿的新型螯合捕收剂。研究了相转移催化剂的种类及用量,原料间配比,无水K2CO3用量和反应温度等因素对反应的影响。得出丙二酸二乙酯烷基化的最佳条件,即反应物摩尔比为丙二酸二乙酯∶卤代烃∶K2CO3∶TBAB=1∶1.2∶1.2∶0.03,反应时间2 h,反应温度90℃。在此条件下获得的产物再经水解、酸化,通过红外光谱和核磁共振鉴定为烃基丙二酸。

Selecting of four Butyl Ammonium Bromide as catalyst,diethyl malonate and alkylhalide as raw materials,in the anhydrous K_2CO_3 alkaline condition,synthesis alkyl malonic acid compounds taking the method of phase transfer catalysis,as the chelating collector of lead-zinc oxide ore.Studying on the type and amount of phase transfer catalyst,ratio of raw materials,anhydrous K_2CO_3 dosage and reaction temperature and other factors on the reaction.The optimum reactants mole ratio of diethyl malonate：alkylhalide：K_2CO_3：TBAB= 1∶1.2∶1.2∶0.03,in reaction temperature 90 ℃ for 2 h,which is the best conditions of diethyl malonate alkylating.The product obtained after hydrolysis and acidification is alkyl malonic acid identified by FT-IR and H-NMR.