Acetic　acid　dehydration　system　is　an　important　unit　to　achieve　acetic　acid　recovery　in　the　production　of　PTA.　In　view　of　energy　saving　and　consumption　reduction,　the　use　of　sec-butyl　acetate　(SBA)　as　entrainer　and　extractant　for　the　acetic　acid　dehydration　process　was　proposed　in　this　paper,　to　replace　isobutyl　acetate　(IBA)　solvent　in　traditional　process.　An　acetic　acid　dehydration　unit　in　petrochemical　enterprises　in　Jiangsu　Province　was　simulated　by　Aspen　Plus.　The　feasibility　of　using　SBA　solvent　instead　of　IBA　was　investigated,　and　the　process　was　systematically　optimized.　The　steady　state　results　demonstrate　that　when　SBA　is　used　as　extractant　and　entrainer,　the　design　requirements　of　acetic　acid　hydration　system　can　be　satisfied　through　changing　the　oil　phase　reflux　ratio　from　0.83　to　0.84　and　adjusting　the　aqueous　phase　reflux　ratio　from　0.22　to　0.234　with　the　other　operating　parameters　unchanged.　Under　this　condition,　steam　consumption　can　save　2.71×104　t/a　and　the　loss　of　solvent　can　be　reduced　578　t/a.　©　2019,　Editorial　Office　of　＂CHEMICAL　ENGINEERING＂　(CHINA).　All　right　reserved.