公开(公告)号：DE10002790A1

公开(公告)日：2001-07-26

申请号：DE10002790

申请日：2000-01-24

Applicant: BASF AG

Inventor： AUER HEINZ ,  BESLING BERND ,  HAMMER HANS ,  HASSE HANS ,  SAUER FRIEDRICH ,  VICARI MAXIMILIAN ,  WAGNER GERHARD ,  ADRIAN TILL

IPC: C07C51/56 ,  B01J14/00 ,  C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C53/02 ,  C07C233/01

Abstract: In the production of anhydrous formic acid (FA) by hydrolysis of methyl formate (MF) followed by distillation, extraction of the bottom product with an amide extractant (I) and further distillation stages, the off-gas streams containing MF and/or methanol and/or FA are washed with (I) which is then returned to the process along with these products in solution. The production of (essentially) anhydrous formic acid (FA) involves: (i) hydrolysis of methyl formate (MF), (ii) removal of methanol and excess MF by distillation, (iii) liquid-liquid extraction of the bottom product with an amide of formula R (R )NC(O)R (I), (iv) distillation of the extract, (v) recycling the top product from (iv) (containing water and some FA) to the lower part of the distillation column used in stage (ii), (vi) separation of the bottom product from (iv) by distillation into anhydrous FA and extractant (I) and (vii) recycling (I) into the process. In this process, the off-gas streams containing MF and/or methanol and/or FA are washed with extractant (I), which is then returned to the process along with dissolved MF and/or methanol and/or FA. R , R = alkyl, cycloalkyl, aryl or aralkyl, or R plus R plus the linking nitrogen may form a 5- or 6-membered heterocycle, with the proviso that only one of these groups is aryl; R = H or 1-4C alkyl An Independent claim is also included for the apparatus used for this process, comprising a synthesis reactor (6), a hydrolysis reactor (1), a distillation system (2) for stage (ii), a distillation system (4) for stage (iv), an extraction unit (3), a distillation system (5) for stage (vi) and an off-gas scrubber (9).

公开(公告)号：AU6466399A

公开(公告)日：2000-04-10

申请号：AU6466399

申请日：1999-09-21

Applicant: BASF AG

Inventor： ADRIAN TILL ,  BESSLING BERND ,  HASSE HANS ,  VANSANT FRANS ,  THEIS GERHARD

IPC: C07C29/10 ,  C07C29/76 ,  C07C29/80 ,  C07C31/20

Abstract: A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis product of ethylene oxide by pressure dewatering, vacuum dewatering and subsequent purifying distillation, which includes the pressure dewatering columns or at least the first pressure dewatering column of the battery (2, 3, 4) having a stripping section with at least one separating stage, preferably with from 2 to 10 separating stages, particularly preferably with from 3 to 6 stages, and a portion of the overhead stream of the pressure dewatering column(s) (2, 3, 4) having a stripping section being removed from the system.

公开(公告)号：DE19843697A1

公开(公告)日：2000-03-30

申请号：DE19843697

申请日：1998-09-23

Applicant: BASF AG

Inventor： ADRIAN TILL ,  BESLING BERND ,  HASSE HANS ,  VANSANT FRANS ,  THEIS GERHARD

IPC: C07C29/10 ,  C07C29/80 ,  C07C31/20

Abstract: The invention relates to a method for obtaining highly pure monoethylene glycol from the product of hydrolysis of ethylene oxide by distillation, by means of dehydration under pressure, preferably in a cascade, vacuum dehydration and subsequent pure distillation. During the vacuum dehydration, an aqueous stream containing monoethylene glycol in a concentration of less than 1 wt. %, preferably less than 0.1 wt. %, medium boilers and light boilers is drawn off and then sluiced out, optionally after reprocessing.

公开(公告)号：DE19843652A1

公开(公告)日：2000-03-30

申请号：DE19843652

申请日：1998-09-23

Applicant: BASF AG

Inventor： THEIS GERHARD ,  ADRIAN TILL ,  BESLING BERND ,  HASSE HANS ,  VANSANT FRANS

IPC: C07C29/10 ,  C07C29/76 ,  C07C29/80 ,  C07C31/20

Abstract: The invention relates to a method for obtaining highly pure monoethylene glycol from the product of hydrolysis of ethylene oxide by distillation, by means of dehydration under pressure, preferably in a cascade, vacuum dehydration and subsequent pure distillation. According to the inventive method, the pressure dehydration column or at least the first pressure dehydration column of the cascade (2, 3, 4) has a stripping section with at least one separation stage, preferably 2-10 separation stages, especially 3-6 stages, and in that part of the top flow of the dehydration column(s) (2, 3, 4) is sluiced out with the stripping section.