公开(公告)号：US20240300817A1

公开(公告)日：2024-09-12

申请号：US18277415

申请日：2022-02-10

Applicant: BASF SE

Inventor： Torsten MATTKE ,  Kai THIELE ,  Jens FERBITZ ,  Peter VAN DEN ABEEL ,  Hans-Juergen PALLASCH

IPC: C01B7/07 ,  B01D53/00 ,  C01B32/80 ,  C07C263/20

CPC classification number: C01B7/0712 ,  B01D53/002 ,  C01B7/0731 ,  C01B32/80 ,  C07C263/20 ,  B01D2256/26 ,  B01D2257/2064

Abstract: A process of separating phosgene and hydrogen chloride, comprises: conveying a mixed stream containing hydrogen chloride and phosgene into a distillation column; withdrawing from the distillation column a bottom stream containing phosgene; withdrawing a top stream containing hydrogen chloride; compressing at least a portion of the top stream and at least partially condensing the compressed top stream to form a liquid stream, decompressing at least a portion of the liquid stream to form a cooled liquid stream and a cooled gas stream; and recycling the cooled liquid stream to the top of the distillation column as a reflux; the process additionally comprising temporarily introducing an absorbing solvent into the distillation column, in particular during starting-up and/or shutting-down of the process. The process allows for safe operation even when hydrogen chloride production only gradually begins or decreases, without the necessity of storing hydrogen chloride.

公开(公告)号：US20180044179A1

公开(公告)日：2018-02-15

申请号：US15557187

申请日：2016-03-10

Applicant: BASF SE

Inventor： Heiner SCHELLING ,  Torsten MATTKE ,  Hans-Juergen PALLASCH ,  Kai THIELE

IPC: C01B7/07 ,  C01B32/80 ,  C07C263/10 ,  B01D53/00

CPC classification number: C01B7/0731 ,  B01D53/002 ,  B01D2257/2045 ,  C01B7/0712 ,  C01B32/80 ,  C07C263/10 ,  C07C263/20 ,  F25J3/00

Abstract: The invention relates to a method of separating a phosgene- and hydrogen chloride-comprising stream (5), wherein said method comprises conveying the hydrogen chloride- and phosgene-comprising stream (5) into a distillation column (1), withdrawing at the bottom of the distillation column (1) a phosgene-comprising stream (7) and withdrawing at the top of the column an essentially hydrogen chloride-comprising stream (9). At least a portion of the stream (9) withdrawn at the top is compressed and at least partially condensed and at least a portion of the liquid and compressed essentially hydrogen chloride-comprising stream is decompressed and recycled into the top of distillation column (1) as reflux.