缓蚀阻垢剂(HEDP)的制备工艺研究  

Preparation technology for corrosion inhibitor( HEDP)

作　　者：黄良取[1] 张宏波[1] 毕亚凡[1] 

机构地区：[1]武汉工程大学环境与城市建设学院,湖北武汉430073

出　　处：《现代化工》2014年第4期108-111,共4页Modern Chemical Industry

基　　金：武汉工程大学研究生创新基金(CX2013112)

摘　　要：羟基乙叉二膦酸（HEDP）是一种常用的水质稳定剂,具有优良的阻垢和缓蚀作用,广泛用于工业循环冷却水系统中.以三氯化磷、冰醋酸和乙酸酐为原料,经焦亚磷酸的制备、焦亚磷酸的乙酰化以及二乙酰焦亚磷酸的水解三步合成羟基乙叉二膦酸,分析了3个合成步骤的影响因素.试验结果显示,在三氯化磷、冰醋酸和乙酸酐的摩尔比为1.24∶3∶0.62,焦亚磷酸制备的反应温度控制在35～ 40℃,焦亚磷酸乙酰化的保温温度为120℃,保温时间为2h,充分水解后得到目标产物,其红外光谱表征表明合成的目标产物为羟基乙叉二膦酸,其收率大于90％,正磷质量分数低于1％,亚磷质量分数低于1％,活性组分大于50％,螯合值大于450 mg/g.1-Hydroxy ethylidene-1,1-diphosphonic acid （HEDP） is a frequently-used agent of water quality stabilizer,which is widely used in industrial circulating cooling water system and has good scale and corrosion inhibition effect.With phosphorus trichloride,glacial acetic acid and acetic anhydride as raw materials,HEDP is synthesized by three-step reaction including pyrophosphorous acid preparation,pyrophosphorous acid acetylation and hydrolysis.The influence factors are analyzed in the three synthetic steps.The result indicates that the targeted product can be obtained under the following conditions：1.24 ∶ 3 ∶ 0.62 molar ratio of phosphorus trichloride,glacial acetic acid and acetic anhydride,the reaction temperature for pyrophosphorous acid preparation controlled at 35-40℃,pyrophosphorous acid acetylation at 120℃ and preservation for 2 hours.IR spectra show that the synthesized product is HEDP with the yield more than 90％.The phosphorus content of HEDP is less than 1％,phosphorous is lower than 1％,the active component is greater than or equal to 50％ and chelating value greater than or equal to 450 mg/g.

关 键 词：水处理剂 HEDP 合成 

分 类 号：O613.62[理学—无机化学]