常壓操作連續(xù)精餾塔用以分離苯-甲苯溶液,y1= 0.72(摩爾分率,下同)的塔頂蒸汽經(jīng)分凝器冷凝后液相作為塔頂回流液,氣相經(jīng)全冷凝器冷凝成塔頂產(chǎn)品,進(jìn)料F為100kmol/h,進(jìn)料濃度XF=0.44,泡點(diǎn)進(jìn)料,塔頂與塔底產(chǎn)品D=W=50kmol/h,塔頂餾出液濃度XD=0.83,取相對(duì)揮發(fā)度α=2.5,求:
(1)塔釜液濃度;
(2)操作回流比;
(3)塔釜蒸發(fā)量V’,kmol/h。