摘要
为促进碳酸乙烯酯法合成乙二醇(EG)新工艺的工业化应用,测定了不同组成NY-2催化剂-EG-二甘醇(DEG)三组分物系的黏度和密度等分离单元所需的物性数据,该三组分物系的黏度和密度均随温度的升高而减小,黏度与温度呈非线性关系,密度与温度呈线性关系;通过测定NY-2催化剂在EG-DEG混合溶剂中的溶解度,计算NY-2催化剂的回收率,并考察了回收后NY-2催化剂的活性。实验结果表明,可采用冷却结晶的方法回收NY-2催化剂,为保证NY-2催化剂的回收率大于75%,精馏塔塔釜采出液中DEG的质量分数应大于80%。精馏塔塔釜温度过高将影响回收的NY-2催化剂活性;与新鲜NY-2催化剂相比,要使回收的NY-2催化剂的环氧乙烷转化率降幅小于10%,精馏塔塔釜温度应低于180℃。
To promote industrial application of the ethylene glycol（EG） synthesis through ethylene carbonate method, density and viscosity of the NY-2 catalyst, EG and diethylene glycol （DEG） ternary system were determined. Both the viscosity and density decreased with rise of the system temperature. There were a nonlinear relationship between the viscosity and the temperature, and a linear relationship between the density and the temperature. Solubility of NY-2 catalyst in the mixed EG and DEG solvent was investigated. The theoretical recovery of NY-2 catalyst was calculated according to the solubility. Activity of recovered NY-2 catalyst was studied. The results indicated that the NY-2 catalyst could be recovered through cooling crystallization and DEG mass fraction in the tower bottom solvent should be more than 80% to ensure catalyst recovery more than 75%. The temperature of EG and DEG rectifying tower bottom should be below 180 ℃, which could ensure epoxy ethane conversion declined less than 10%.
出处
《石油化工》
CAS
CSCD
北大核心
2010年第6期641-645,共5页
Petrochemical Technology
基金
长江学者和创新团队发展计划项目(IRT0732)
中国石油化工集团公司基金资助项目(408077)
关键词
乙二醇
碳酸乙烯酯
二甘醇
催化剂回收
黏度
密度
溶解度
ethylene glycol
ethylene carbonate
diethylene glycol
catalyst recovery
viscosity
density
solubility
