碳四炔烃选择性加氢单元将碳四炔烃转化为高价值的丁二烯,处理高危炔烃的同时,显著提高了装置的经济效益,但加氢碳四返回丁二烯抽提装置可能导致丁二烯抽提装置负荷尤其是第一萃取塔负荷增加.文中主要分析新增碳四炔烃选择性加氢单元对丁二烯抽提装置萃取塔负荷的影响.结果表明:由于加氢碳四主要组成是碳四单烯烃和烷烃,而二烯烃和碳四炔烃的含量较低,导致第一萃取塔气液相负荷增加量呈现不同趋势,体现在第一萃取塔精馏段气相负荷增大明显,尤其是碳四进料上方的第41~47 塔板临近液泛线,而液相负荷增加有限;新增碳四炔烃选择性加氢单元对第二萃取塔负荷影响较小,可忽略.
Selective hydrogenation unit converts C4 alkynes into high-value butadiene,which improves the economic efficiency of the unit while treating the dangerous alkynes.However,the return of hydrogenated C4 alkynes to butadiene extraction unit may increase the load of the butadiene extraction unit,especially the load of the first extraction column.In this paper,the influence of newly installed C4 alkyne selective hydrogenation unit on the load of extraction columns in butadiene extraction unit are analyzed.The results show that the hydrogenated C4 mainly consists of C4 monoolefins and alkanes,and the content of diolefin and C4 alkyne is low,leading to different trends in the increase of gas load and liquid load in the first extraction column.The gas load in the rectification section of the first extraction column increases significantly,especially in the 41st to 47th trays above the C4 feed tray near the flooding line,while the increase in liquid load is limited.The newly installed C4 alkyne selective hydrogenation unit has a negligible effect on the load of the second extraction column.