Hydrogen　sulfide,　the　main　component　in　the　waste　gas　source　from　viscose　fiber　factory,　is　used　as　raw　material　after　purification　through　the　rectisol　process　to　react　with　1,　4-butanediol.　The　reactive　products　are　separated　and　refined　to　obtain　99wt%　tetrahydrothiophene.　The　whole　process　is　simulated　by　means　of　Aspen　Plus　software,　the　process　conditions　such　as　the　number　of　trays,　feed　position　and　reflux　ratio　are　optimized,　and　the　optimal　process　conditions　are　determined.　In　addition,　electric　energy　can　be　saved　by　37.7%　and　rectification　operation　cost　can　cut　by　14%　through　improving　the　traditional　technology　and　optimizing　design　of　energy-saving　scheme.　©　2019,　China　National　Chemical　Information　Center.　All　right　reserved.