乙腈法丁二烯抽提装置原料分析及生产优化  

Raw material analysis and production optimization of acetonitrile butadiene extraction device

作　　者：杨二燕 冯江元 Yang Eryan;Feng Jiangyuan(Sinochem Quanzhou Petrochemical Co.,Ltd.,Quanzhou Fujian 362103,China)

机构地区：[1]中化泉州石化有限公司,福建泉州362103

出　　处：《石油化工》2022年第3期346-351,共6页Petrochemical Technology

摘　　要：从乙烯装置来的混合碳四(简称裂解碳四)中丁二烯含量通常为50%(w),是生产高纯度丁二烯的重要原料。某新建乙腈法丁二烯抽提装置自开工运行以来,裂解碳四中丁二烯平均含量只有35%(w),严重偏离了设计指标,造成第一萃取塔波动较大,影响塔底粗丁二烯和塔顶抽余碳四的质量,严重时导致丁二烯产品不合格。针对原料中丁二烯含量较低的问题,通过优化乙腈与裂解碳四的进料质量比(腈烃比)、溶剂进料温度、溶剂水含量等措施,确保了第一萃取塔操作平稳,保证了丁二烯产品和抽余液副产品质量合格;优化的腈烃比为5.91~7.50、溶剂进料温度40~41℃、溶剂水含量7%~8%(w)。同时针对原料罐底结焦严重的问题,通过采取降低原料中碳五含量、注入阻聚剂等措施,抑制了原料中丁二烯聚合物的生成,保证了装置安全平稳运行。Butadiene content in pyrolysis C_(4) from ethylene plant is usually about 50%(w),which is an important raw material for producing high-purity butadiene.Since the start-up of a new acetonitrile butadiene extraction device,the average content of butadiene in pyrolysis C_(4) is only 35%(w),which seriously deviates from the design index,resulting in large fluctuation of the first extraction tower,affecting the quality of crude butadiene at the bottom of the tower and C_(4) raffinate at the top of the tower,and seriously leading to unqualified butadiene products.Aiming at the problem of low content of butadiene in raw materials,by optimizing the feed mass ratio of acetonitrile to C_(4),solvent temperature and water content of solvent,the operation of the first extraction tower was ensured to be stable,and the quality of butadiene products and C_(4) raffinate was ensured to be qualified.The optimized mass ratio of acetonitrile to pyrolysis C_(4) was 5.91-7.50,the solvent temperature was 40-41℃,and the water content was 7%-8%(w).In view of the serious coking problem in the bottom of the raw material tank,the formation of butadiene polymer in the raw material was inhibited by taking measures such as reducing the C_(5) content in the raw material and injecting inhibitor,so as to ensure the safe and stable operation of the device.

关 键 词：乙腈 丁二烯 萃取 聚合物 优化 

分 类 号：TQ221.2[化学工程—有机化工]