1 types 1.1 raffinate-1 or c4r1 1.2 raffinate-2 or c4r2 1.3 raffinate-3 or c4r3 1.4 raffinate-4 or c4r4 types raffinate-1 or c4r1 in naphtha cracking process, c4r1 refers c4 residual obtained after separation of 1,3-butadiene c4 raffinate stream , which, consists of isobutylene 40~50 wt% , cis- or trans-2-butene 30~35 wt%. c4r1 side product in 1,3-butadiene plant , feed tert-butyl alcohol plant. raffinate-2 or c4r2 in naphtha cracking process, c4r2 refers c4 residual obtained after separation of 1,3-butadiene , isobutylene c4 raffinate stream , consists of cis- or trans-2-butene 50~60 wt%, 1-butene 10~15 wt%, , n-butane ~20 wt%. c4r2 side product in tert-butyl alcohol plant if c4r1 used feed. raffinate-3 or c4r3 in naphtha cracking process, c4r3 refers c4 residual obtained after separation of 1,3-butadiene, isobutylene, , 1-butene c4 raffinate stream consists of cis- or trans-2-butene, n-butane, , unseparated 1-butene. c4r3 being process through selective hydrogenation unit (shu) , cdh...
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