摘要
用氯化反应与熔融结晶耦合装置,进行乙酸氯化与产物氯乙酸(MCA)的结晶分离,避免了 MCA 的深度氯化,从而提高了 MCA 的收率。实验中保持结晶条件不变,考察了不同氯气流量对反应体系中 MCA 含量随反应时间的变化。结果表明,通氯量为314.6 mL/min 时,出现 MCA 含量变化的“平台期”,反应与分离能力相匹配,MCA 晶体含量达94.9%(质量分数,下同),二氯乙酸含量在1.5%以下。
An coupling apparatus with a chlorination reactor and a melt crystallizer was built,which was used in chlorination of acetic acid and separation of monochloroacetic acid(MCA)by crystalliza- tion at the same time.It meet the demands for restraining the over-chlorination and increasing the yield of MCA.Under the same conditions of crystallization,the change of the concentration of MCA with the reaction time at different chlorine flow was sdudied.The results showed that a“platform”in the concentration curve of MCA appears when the chlorine flow is 314.6 mL/min,and the reaction ca- pacity matches with the separation capacity at that time.The mass fraction of MCA crystal is 94.9%, and the content of dichloroacetic acid is below 1.5%.
出处
《精细石油化工》
CAS
CSCD
北大核心
2005年第3期43-46,共4页
Speciality Petrochemicals
