GB737442A - Recovery of phosgene - Google Patents

Recovery of phosgene

Info

Publication number
GB737442A
GB737442A GB34436/53A GB3443653A GB737442A GB 737442 A GB737442 A GB 737442A GB 34436/53 A GB34436/53 A GB 34436/53A GB 3443653 A GB3443653 A GB 3443653A GB 737442 A GB737442 A GB 737442A
Authority
GB
United Kingdom
Prior art keywords
phosgene
gases
pipe
hydrogen chloride
cooler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB34436/53A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of GB737442A publication Critical patent/GB737442A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/70—Compounds containing carbon and sulfur, e.g. thiophosgene
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/80—Phosgene

Abstract

Phosgene is recovered from waste gases containing phosgene and hydrogen chloride by passing the gases upwardly through a cooling apparatus which cools the gases to a temperature below the boiling point of phosgene but above that of hydrogen chloride, e.g. - 40 DEG to - 60 DEG C., down which cooling apparatus liquid phosgene, condensed from the waste gases by the cooling, trickles under gravity. Waste gases at 0-5 DEG C. enter tubular cooler 2, cooled by boiling difluorodichloromethane or difluoromonochloromethane, at 1, and pass upwardly <PICT:0737442/III/1> countercurrent to condensed liquid phosgene, which discharges into tank 4. Uncondensed gases pass through pipe 5 to washer 6, where the hydrogen chloride is extracted by water entering at 8 and is withdrawn as an aqueous solution at 7. Any inert gases remaining are exhausted through pipe 9 by fan 10, which maintains a slight subatmospheric pressure in the whole apparatus. In alternative apparatus (Fig. 2, not shown) a pressure relief valve, preferably automatic, is inserted in pipe 5, so that the cooler 2 is maintained under slight superatmospheric pressure, e.g. 100-200 mm. of water, while the remainder of the apparatus is maintained by fan 10 under subatmospheric pressure, in order to avoid moisture being sucked into the cooler in the event of leaks, with consequent contamination of the phosgene by corrosion and metal chlorides.
GB34436/53A 1952-12-19 1953-12-10 Recovery of phosgene Expired GB737442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE737442X 1952-12-19

Publications (1)

Publication Number Publication Date
GB737442A true GB737442A (en) 1955-09-28

Family

ID=6642573

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34436/53A Expired GB737442A (en) 1952-12-19 1953-12-10 Recovery of phosgene

Country Status (2)

Country Link
FR (1) FR1089476A (en)
GB (1) GB737442A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253029A (en) * 1962-05-09 1966-05-24 Du Pont Method for the separation of cof2 and hci
US4251457A (en) * 1978-07-24 1981-02-17 Kondratenko Vladimir I Process for purification of the off-gases resulting from the production of benzoyl chloride from phosgene
WO2007014936A2 (en) 2005-08-04 2007-02-08 Basf Se Method for producing diisocyanates
EP1849767A1 (en) * 2006-04-24 2007-10-31 Bayer MaterialScience LLC Process for the production of isocyanates
US7612234B2 (en) 2006-05-23 2009-11-03 Bayer Materialscience Ag Processes for separating carbon monoxide from a hydrogen chloride-containing gas
US7659430B2 (en) 2004-09-13 2010-02-09 Basf Aktiengesellschaft Method for separating hydrogen chloride and phosgene
WO2011003532A1 (en) 2009-07-09 2011-01-13 Bayer Materialscience Ag Method for producing isocyanates
EP2511258A1 (en) 2007-01-17 2012-10-17 Basf Se Method for making isocyanates
WO2017009311A1 (en) 2015-07-16 2017-01-19 Covestro Deutschland Ag Method for producing isocyanates
US10626084B2 (en) 2018-08-03 2020-04-21 Covestro Llc Method for producing two isocyanates
WO2020132936A1 (en) 2018-12-26 2020-07-02 万华化学集团股份有限公司 Method for preparing isocyanate in gaseous phase

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253029A (en) * 1962-05-09 1966-05-24 Du Pont Method for the separation of cof2 and hci
US4251457A (en) * 1978-07-24 1981-02-17 Kondratenko Vladimir I Process for purification of the off-gases resulting from the production of benzoyl chloride from phosgene
US7659430B2 (en) 2004-09-13 2010-02-09 Basf Aktiengesellschaft Method for separating hydrogen chloride and phosgene
WO2007014936A2 (en) 2005-08-04 2007-02-08 Basf Se Method for producing diisocyanates
EP2351733A2 (en) 2005-08-04 2011-08-03 Basf Se Method for making diisocyanates
US7915444B2 (en) 2005-08-04 2011-03-29 Basf Aktiengesellschaft Method for producing diisocyanates
CN101062905B (en) * 2006-04-24 2013-01-02 拜耳材料科技股份有限公司 Process for the production of isocyanates
US7504533B2 (en) 2006-04-24 2009-03-17 Bayer Materialscience Llc Process for the production of isocyanates
EP1849767A1 (en) * 2006-04-24 2007-10-31 Bayer MaterialScience LLC Process for the production of isocyanates
US7612234B2 (en) 2006-05-23 2009-11-03 Bayer Materialscience Ag Processes for separating carbon monoxide from a hydrogen chloride-containing gas
EP2511258A1 (en) 2007-01-17 2012-10-17 Basf Se Method for making isocyanates
WO2011003532A1 (en) 2009-07-09 2011-01-13 Bayer Materialscience Ag Method for producing isocyanates
DE102009032413A1 (en) 2009-07-09 2011-01-13 Bayer Materialscience Ag Process for the preparation of isocyanates
US8563768B2 (en) 2009-07-09 2013-10-22 Bayer Materialscience Ag Process for the preparation of isocyanates
WO2017009311A1 (en) 2015-07-16 2017-01-19 Covestro Deutschland Ag Method for producing isocyanates
US10239826B2 (en) 2015-07-16 2019-03-26 Covestro Deutschland Ag Method for producing isocyanates
US10626084B2 (en) 2018-08-03 2020-04-21 Covestro Llc Method for producing two isocyanates
WO2020132936A1 (en) 2018-12-26 2020-07-02 万华化学集团股份有限公司 Method for preparing isocyanate in gaseous phase
US11814339B2 (en) 2018-12-26 2023-11-14 Wanhua Chemical Group Co., Ltd. Method for preparing isocyanate in gaseous phase

Also Published As

Publication number Publication date
FR1089476A (en) 1955-03-17

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