公开(公告)号：US20150080600A1

公开(公告)日：2015-03-19

申请号：US14546587

申请日：2014-11-18

Applicant: BASF SE

Inventor： Vanessa Simone LEHR ,  Torsten MATTKE ,  Carsten KNOESCHE ,  Heiner SCHELLING ,  Gerhard OLBERT

IPC: C07C263/10

CPC classification number: C07C263/10 ,  C01B7/04 ,  Y02P20/22 ,  C07C265/00

Abstract: The present invention relates to gas phase phosgenation of amines for preparation of isocyanates. In the present invention, phosgene is prepared by reacting chlorine with an excess of carbon monoxide in a gas phase. The obtained phosgene-containing reaction mixture is divided into two streams by a thermal and/or a membrane separating process. The first stream is a low-carbon monoxide stream of no more than 1% by weight of carbon monoxide, based on a total weight of the first stream. The second stream is a carbon monoxide-rich stream of more than 10% by weight of carbon monoxide, based on a total weight of the second stream. The first stream is used as the phosgene-containing reactant stream in the gas phase phosgenation of amines to prepare isocyanates. The second stream can be recycled into the phosgene synthesis.

Abstract translation: 本发明涉及用于制备异氰酸酯的胺的气相光气化。 在本发明中，气相中的氯与过量的一氧化碳反应制备光气。 得到的含有光气的反应混合物通过热和/或膜分离方法分成两股。 基于第一料流的总重量，第一料流是不超过1重量％的一氧化碳的低碳一氧化碳流。 基于第二料流的总重量，第二料流是大于10重量％的一氧化碳的一氧化碳浓缩物流。 在胺的气相光气化中，将第一流用作含有光气的反应物流，以制备异氰酸酯。 第二流可以再循环进入光气合成。