A process for safe production of phosgene

Patent metadata

Field	Value
Publication number	US-2018194632-A1
Application number	US-201515316405-A
Country	US
Kind code	A1
Filing date	Jun 1, 2015
Priority date	Jun 11, 2014
Publication date	Jul 12, 2018
Grant date	—

Abstract

In a process for safe production of phosgene (COCI 2 ) from carbon monoxide and chlorine according to the reaction scheme CO (g)+Cl 2 (g)−>COCI 2 (g) in a plant with a capacity of phosgene below 10 t/hr, the CO is produced on site from a feed stock based mainly on CO 2 . The plant preferably comprises a solid oxide electrolysis cell (SOEC) stack system producing CO for use together with chlorine in the phosgene synthesis. This way of producing phosgene is based on using primary raw materials for which escape concentrations above 1000 ppm or even above 10000 ppm or 10% will not result in any health risk.

First claim

1 . A process for the production of phosgene (COCl 2 ) from carbon monoxide and chlorine according to the reaction scheme
CO(g)+Cl 2 (g)−>COCl 2 (g)   (1)
wherein the CO is produced electrolytically on site from CO 2 in a solid oxide electrolysis cell (SOEC) stack system.

2 . Process according to claim 1 , wherein the SOEC stack system producing CO is accommodated to turndown ratios below 30%, preferably below 10%.

3 . Process according to claim 1 , wherein oxygen from the SOEC stack system is used wholly or in part for the production of chlorine.

4 . Process according to claim 1 , wherein part of the SOEC unit is used to make electrical energy from the hydrogen produced in the chlorine plant when full capacity on the CO plant is not needed.

5 . A plant for the production of phosgene from carbon monoxide and chlorine by a process according claim 1 , said plant comprising a solid oxide electrolysis cell (SOEC) stack system producing CO for use together with chlorine in the phosgene synthesis.

6 - 14 . (canceled)

Assignees

• Haldor Topsoe As

Inventors

• Jakobsson Niklas Bengt
• Hinnemann Berit
• Pedersen Claus Friis
• Schjødt Niels Christian

Classifications

• C25B15/08

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C01B32/80 Primary

  Phosgene · CPC title

• C25B1/00

  Electrolytic production of inorganic compounds or non-metals · CPC title

• C25B9/18

  Chemistry & Metallurgy · mapped topic

• C25B1/26

  Chlorine; Compounds thereof (by simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine C25B1/34) · CPC title