公开(公告)号：US2884377A

公开(公告)日：1959-04-28

申请号：US60528056

申请日：1956-08-21

申请人： EXXON RESEARCH ENGINEERING CO

发明人： SAMUEL BOZICH ,  SHMIDL ALBERT J ,  SMALLING JACK W

IPC分类号： B01D53/52

CPC分类号： C10G19/00 ,  B01D53/523

公开(公告)号：US2913503A

公开(公告)日：1959-11-17

申请号：US55540555

申请日：1955-12-27

申请人： EXXON RESEARCH ENGINEERING CO

发明人： SAMUEL BOZICH ,  LEWIS EVERETT W ,  SMITH BUFORD D

IPC分类号： B01D9/00 ,  B01D35/22 ,  C07C7/14

CPC分类号： B01D9/0004 ,  B01D9/0059 ,  B01D35/22 ,  C07C7/14 ,  C07C13/18 ,  C07C15/00

摘要： In a method for separating a crystallizable hydrocarbon from a mixture thereof with other hydrocarbons boiling in the range from 150 DEG F. to 500 DEG F. in which the crystallizable hydrocarbon is at least 70 per cent by weight of the mixture, the mixture is cooled to form a first crystalline slurry which is maintained at a constant temperature, a first filtrate is separated from the first slurry and a second slurry formed from the first filtrate, crystallizable hydrocarbon is separated from the second slurry and is returned to the first or second slurry, and purified hydrocarbon is recovered from the first slurry. In one embodiment (Fig. 1) a feed containing cyclohexane is fed by a line 11 to a heat exchanger 12 where it is cooled and then to a holding tank 14, where the slurry is kept at a constant temperature by recycling through a heat exchanger 17. The first slurry in tank 14 is passed to a centrifuge 19 by a line 15, and filtrate is sent by a line 20 to a second holding tank 22 maintained at a lower temperature by recycling slurry formed therein through a heat exchanger 25. The second slurry in tank 22 is removed by a line 23 and a part passed through a line filter 28, the filtrate being discharged by a line 29 passing through heat exchanger 12, and the slurry returned by a line 30 to tank 22. Another part of the slurry in line 23 is sent to tank 14. The crystalline cake in centrifuge 19 is sent by a line 21 to a third holding tank 31 where it is maintained at a temperature higher than that in tanks 14 and 22 by recycling through a heat exchanger 34. The third slurry in tank 31 is sent by a line 32 to a centrifuge 36, from which purified crystallized cyclohexane is removed as product by a line 38, and filtrate is sent by a line 37 to a fourth holding tank 39. A fourth slurry is obtained in tank 39 by maintaining a temperature lower than that in tank 31 but higher than that in tanks 14 and 22, by recycling slurry through a heat exchanger 42. Slurry removed by a line 40 is sent to a centrifuge 44, where a filtrate is obtained which is sent by a line 45 to tank 14, and the crystalline cake is sent by a line 46 to tank 31. In a second embodiment the first slurry in tank 14 is sent to centrifuge 19 and a crystalline product removed, while the filtrate is sent by line 20 to tank 22, a part of the second slurry in tank 22 being passed through line filter 28 where the filtrate is discarded and the slurry returned to tank 22, while another part of the slurry from tank 22 is sent to tank 14. In a third embodiment the process is the same as that in the second embodiment but the slurry from tank 22 is centrifuged and the crystalline cake obtained is sent to the first slurry in tank 14 and the filtrate discarded. In the second and third embodiments the third and fourth holding tanks are omitted. The process may also be used to separate paraxylene, orthoxylene, durene, benzene and naphthalene from mixtures containing them.