GB1495249A - Equipment cleaning process - Google Patents

Equipment cleaning process

Info

Publication number
GB1495249A
GB1495249A GB2007976A GB2007976A GB1495249A GB 1495249 A GB1495249 A GB 1495249A GB 2007976 A GB2007976 A GB 2007976A GB 2007976 A GB2007976 A GB 2007976A GB 1495249 A GB1495249 A GB 1495249A
Authority
GB
United Kingdom
Prior art keywords
solvent
equipment
residues
dimethyl
draining
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
GB2007976A
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.)
Monsanto Co
Original Assignee
Monsanto Co
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 Monsanto Co filed Critical Monsanto Co
Publication of GB1495249A publication Critical patent/GB1495249A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/008—Processes of polymerisation cleaning reaction vessels using chemicals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Detergent Compositions (AREA)

Abstract

1495249 Removing nitrile polymer residues MONSANTO CO 14 May 1976 [16 May 1975] 20079/76 Heading C3P Residues of a polymer having 55-85% by wt. of nitrile monomer units (calculated as acrylonitrile) are removed from processing equipment, e.g. polymerization reactors and reflux condensers, by contacting the equipment with a solvent which is dimethyl formamide, dimethyl acetamide, dimethyl sulphoxide or N - methyl - 2 - pyrrolidone under agitation and at a temperature of 75‹ C. to the b.p. of the solvent for sufficient time to dissolve all the residues, draining the solvent, contacting the equipment with fresh solvent to dissolve the film residue of spent solvent, and draining the solvent and then rinsing the equipment with water at a temperature of 50-200‹ C. until the solvent concentration in the rinsing water is below 1 p.p.m. In the examples reactor vessels which had been used to polymerize acrylonitrile and styrene were washed with dimethyl formamide, cold and hot water successively.
GB2007976A 1975-05-16 1976-05-14 Equipment cleaning process Expired GB1495249A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US57822475A 1975-05-16 1975-05-16

Publications (1)

Publication Number Publication Date
GB1495249A true GB1495249A (en) 1977-12-14

Family

ID=24311935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2007976A Expired GB1495249A (en) 1975-05-16 1976-05-14 Equipment cleaning process

Country Status (4)

Country Link
JP (1) JPS51140988A (en)
DE (1) DE2621511A1 (en)
FR (1) FR2311044A1 (en)
GB (1) GB1495249A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698045A (en) * 1995-04-13 1997-12-16 Basf Corporation Method of cleaning polymer residues with NMP
US8653015B2 (en) 2011-04-13 2014-02-18 American Sterilizer Company Environmentally friendly, multi-purpose refluxing cleaner
CN115889369A (en) * 2023-02-24 2023-04-04 山西钢科碳材料有限公司 Cleaning method of acrylonitrile polymerization reactor gel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5698045A (en) * 1995-04-13 1997-12-16 Basf Corporation Method of cleaning polymer residues with NMP
US8653015B2 (en) 2011-04-13 2014-02-18 American Sterilizer Company Environmentally friendly, multi-purpose refluxing cleaner
CN115889369A (en) * 2023-02-24 2023-04-04 山西钢科碳材料有限公司 Cleaning method of acrylonitrile polymerization reactor gel

Also Published As

Publication number Publication date
FR2311044A1 (en) 1976-12-10
JPS51140988A (en) 1976-12-04
FR2311044B1 (en) 1979-07-13
DE2621511A1 (en) 1976-11-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee