Process and reactor for producing phosgene

Patent metadata

Field	Value
Publication number	US-2022332587-A1
Application number	US-202017612237-A
Country	US
Kind code	A1
Filing date	Apr 20, 2020
Priority date	May 20, 2019
Publication date	Oct 20, 2022
Grant date	—

Abstract

The invention relates to a process for producing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a catalyst in a reactor which comprises a plurality of parallel catalyst tubes which are filled with the catalyst and around which at least one fluid heat transfer medium flows, where a feed stream of a mixture of a chlorine input stream and a carbon monoxide input stream is fed into the catalyst tubes and is allowed to react to give a phosgene-comprising product gas mixture, wherein the reaction is carried out at an area load of more than 2.75 kg of phosgene/m2s. The invention also provides a reactor for carrying out the process.

First claim

1 .- 15 . (canceled)

16 . A process for producing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a catalyst in a reactor which comprises a plurality of parallel catalyst tubes which are filled with the catalyst and around which at least one fluid heat transfer medium flows, where a feed stream of a mixture of a chlorine input stream and a carbon monoxide input stream is fed into the catalyst tubes and is allowed to react to give a phosgene-comprising product gas mixture, wherein the reaction is carried out at an area load of more than 2.75 kg of phosgene/m 2 s.

17 . The process according to claim 16 , wherein the catalyst comprises an activated carbon catalyst.

18 . The process according to claim 16 , wherein the amount of carbon tetrachloride formed from the reaction of the activated carbon with chlorine is less than 125 g per metric ton of phosgene produced.

19 . The process according to claim 16 , wherein the reaction is carried out at an area load of from 3 to 9 kg of phosgene/m 2 s.

20 . The process according to claim 19 , wherein the reaction is carried out at an area load of from 4 to 6 kg of phosgene/m 2 s.

21 . The process according to claim 20 , wherein the reaction is carried out at an area load of from 4.1 to 6 kg of phosgene/m 2 s.

22 . The process according to claim 16 , wherein the feed stream has a stoichiometric excess of carbon monoxide over chlorine of from 0.1 to 50 mol %.

23 . The process according to claim 16 , wherein the feed stream is introduced with an absolute pressure in the range from 50 to 2000 kPa (from 0.5 to 20 bar).

24 . The process according to claim 16 , wherein the at least one fluid heat transfer medium flows around the catalyst tubes in separate cooling zones.

25 . The process according to claim 16 , wherein a liquid heat transfer medium is used as fluid heat transfer medium.

26 . A reactor for producing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a catalyst, which comprises a plurality of parallel catalyst tubes which are filled with the catalyst and are at both ends thereof welded in each case into a tube plate, with introduction of the starting materials at the upper end of the catalyst tubes and discharge of the gaseous reaction mixture at the lower end of the catalyst tubes, in each case via a cap, and with input and discharge devices for a fluid heat transfer medium into the shell space between the catalyst tubes, wherein the plurality of the parallel catalyst tubes are designed for an area load of more than 2.75 kg of phosgene per square meter of internal cross-sectional area of the catalyst tubes per second.

27 . The reactor according to claim 26 , wherein the formation of carbon tetrachloride from the reaction of the activated carbon with chlorine is limited by the design of the reactor to less than 125 g per metric ton of phosgene produced.

28 . The reactor according to claim 26 , wherein the plurality of parallel catalyst tubes are designed for an area load of from 4.1 to 6 kg of phosgene per square meter of internal cross-sectional area of the catalyst tubes per second.

29 . The reactor according to claim 26 , wherein the reactor comprises from 1000 to 10000 catalyst tubes.

30 . The reactor according to claim 26 , wherein the shell space is divided into at least two cooling zones separated by intermediate plates.

Assignees

• Basf Se

Inventors

• Olbert Gerhard
• Ferbitz Jens
• Thiele Kai
• Van Den Abeel Peter
• Vandewalle Koenraad
• Brandts Jim
• Mattke Torsten

Classifications

• B01J8/06

  in tube reactors; the solid particles being arranged in tubes · CPC title

• C01B32/80 Primary

  Phosgene · CPC title

• B01J8/065

  Feeding reactive fluids · CPC title

• B01J8/067

  Heating or cooling the reactor (B01J8/062 takes precedence) · CPC title

• B01J2208/065

  Heating or cooling the reactor · CPC title