摘要
中国石油兰州石化分公司采用自行开发的乙腈法建成了90kt/a抽提丁二烯装置,该方法的特点是:裂解C4在第一萃取精馏塔中深度抽提丁二烯,萃余C4中丁二烯的质量分数小于2×10-5;在第二萃取精馏塔的上部用精馏方法分离丁二烯中的乙腈,没有采用常规的水洗方法,简化了流程;脱重塔采用气相进料,减少了相变次数,节能效果明显。2008年,90kt/a乙腈法抽提丁二烯装置的丁二烯实际产量为101.4kt,丁二烯的质量分数为99.73%,其中总炔的质量分数为2.4×10-5,乙腈的质量分数为1.2×10-6,各项工艺指标都达到或超过设计要求。
Extractive distillation process of 1,3-butadiene by acetonitrile method sucessfully applied in 90 kt/a extraction unit of Lanzhou Petrochemical Company was introduced. The characteristics of the process were mainly as follows ： （ 1 ） after 1,3-butadiene was mostly extracted from C4 in first extractive distillation tower, the mass fraction of 1,3-butadiene left in C4 fraction was less than 2 ×10^-5 ; （2）the process was simplified by using distillation to separate acetonitrile in 1,3-butadiene at the upper（ solvent recycling） section of the second extractive distillation tower instead of extraction by water ; （3） for the sake of reducing energy cost of the process, feedstock entering de-heavy tower was in vapor phase, which reduced the repeating of phase change and resulted in significant save of energy.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第7期773-778,共6页
Petrochemical Technology
关键词
裂解碳四
丁二烯
乙腈法
萃取精馏
cracking C4
, 1,3-butadiene
acetonitrile method
extractive distillation
