[go: up one dir, main page]

GB1325286A - Process for the separation of an organic polyisocyanate mixture - Google Patents

Process for the separation of an organic polyisocyanate mixture

Info

Publication number
GB1325286A
GB1325286A GB504672A GB504672A GB1325286A GB 1325286 A GB1325286 A GB 1325286A GB 504672 A GB504672 A GB 504672A GB 504672 A GB504672 A GB 504672A GB 1325286 A GB1325286 A GB 1325286A
Authority
GB
United Kingdom
Prior art keywords
fraction
diphenylmethane diisocyanate
isomers
mixture
diphenylmethane
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
GB504672A
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.)
Reuter Gottfried GmbH
Original Assignee
Reuter Gottfried GmbH
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 Reuter Gottfried GmbH filed Critical Reuter Gottfried GmbH
Publication of GB1325286A publication Critical patent/GB1325286A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/18—Separation; Purification; Stabilisation; Use of additives
    • C07C263/20—Separation; Purification
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
    • C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0025—Foam properties rigid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/005—< 50kg/m3

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

1325286 Separation of polyisocyanate mixtures GOTTFRIED REUTER GmbH 3 Feb 1972 [4 Feb 1971] 5046/72 Heading C2C [Also in Divisions B2 and C3] An organic polyisocyanate mixture which contains, in preponderant amount, diphenylmethane diisocyanate isomers and higher functional polyisocyanates with more than two benzene rings in the molecule is separated by first separating the mixture by a short path distillation into a first fraction which contains a residue of diphenylmethane diisocyanate isomers together with the higher functional polyisocyanates and into a second fraction which, of the polyisocyanates, contains practically only the diphenylmethane diisocyanate isomers and secondly separating the second fraction by fractional crystallization into a third fraction, which predominantly comprises 4,4<SP>1 </SP>- diphenylmethane diisocyanate, and into a fourth fraction, in which the 2,2<SP>1</SP>- and 2,4<SP>1</SP>- isomers of the diphenylmethane diisocyanate are enriched in the 4,4<SP>1</SP>-diphenylmethane diisocyanate. The second fraction may be freed from volatile substances and sparingly volatile, chlorine-containing compounds by a fractional distillation prior to the crystallization step. The fractional crystallization is preferably combined with a wash process in which the wash liquid is a diphenylmethane-diisocyanate mixture with a high content of 4,4<SP>1</SP>-isomer.
GB504672A 1971-02-04 1972-02-03 Process for the separation of an organic polyisocyanate mixture Expired GB1325286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2105193A DE2105193C3 (en) 1971-02-04 1971-02-04 Process for the separation of an organic polyisocyanate mixture

Publications (1)

Publication Number Publication Date
GB1325286A true GB1325286A (en) 1973-08-01

Family

ID=5797784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB504672A Expired GB1325286A (en) 1971-02-04 1972-02-03 Process for the separation of an organic polyisocyanate mixture

Country Status (4)

Country Link
BE (1) BE778942A (en)
DD (1) DD106366A1 (en)
DE (1) DE2105193C3 (en)
GB (1) GB1325286A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1417087A (en) * 1973-05-29 1975-12-10 Ici Ltd Polyisocyanates
DE2711958B2 (en) * 1977-03-18 1981-08-13 Bayer Ag, 5090 Leverkusen Binding or impregnating agent for lignocellulosic materials
DE19739191A1 (en) * 1997-09-08 1999-03-11 Henkel Kgaa Use of foam-free compositions containing polyurethanes for the production of casting resins and coating compositions

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217024A (en) * 1963-03-22 1965-11-09 Allied Chem Conversion of mixtures of 2, 4-and 2, 6-toluene diisocyanates to other mixtures of different isomer ratio
BE755243Q (en) * 1965-07-08 1971-02-01 Upjohn Co ISOCYANATES AND POLYISOCYANATES MANUFACTURING PROCESSES
DE1923214B2 (en) * 1969-05-07 1973-08-02 PROCESS FOR THE SIMULTANEOUS PREPARATION OF PURE 4,4'-DIPHENYLMETHANE DIISOCYANATE AND A POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE MIXTURE, POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE, AND THE USE OF POLYPHENYL-POLYMETHYLENE-POLYISOCYANATE

Also Published As

Publication number Publication date
DE2105193B2 (en) 1980-12-04
DE2105193A1 (en) 1972-08-10
DE2105193C3 (en) 1981-07-09
DD106366A1 (en) 1974-06-12
BE778942A (en) 1972-05-30

Similar Documents

Publication Publication Date Title
EP0194761A1 (en) Process for separating isoprene
GB1263439A (en) A process for the production of isocyanates
GB1452610A (en) Process for solvent deashing of hydrofined coal solution
GB1325286A (en) Process for the separation of an organic polyisocyanate mixture
GB1193401A (en) Liquid diphenylmethane diisocyanate compositions
GB1417087A (en) Polyisocyanates
GB1398975A (en) Heat treatment and distillation of methylene bridged polyphenyl polyisocyanates
US2775627A (en) Jnjznjs
US2496253A (en) Production of xylenes
USRE22379E (en) Recovery of pure aromatics
GB1346402A (en) Polyisocyanates and their use in the production of polyurethane plastics
GB1423993A (en) Process for the crystallisation of diphenylmethane diisocyanate from a crude undistilled polyisocyanate mixture
GB894133A (en) Multistage xylene separation process
GB1271992A (en) Refining of isocyanates
US2676903A (en) Fractional liquid extraction of vitamins
ES444215A3 (en) Procedure for the simultaneous preparation of a pure 4,4-difenylmethane diisocyanate and a mixture of folifenylpolimethylene-polyisocianate. (Machine-translation by Google Translate, not legally binding)
US2640804A (en) Purification of substituted aromatic compounds
IE36118L (en) Separating aromatic hydrocarbons
GB1040417A (en) Recovery of organic isocyanates from crude reaction mixtures
Fischbach et al. The separation of penicillins by partition chromatography
US3541164A (en) Fractionation of monochloroparaffins
US3089829A (en) Separation of m-xylene and p-xylene by distillation in the presence of benzyl alcohol
DE871748C (en) Process for the production of pure benzene
SU137907A1 (en) Azeotropic ethylbenzene recovery method
US2856442A (en) Extractive distillation process

Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414A Case decided by the comptroller ** specification amended (sect. 14/1949)
SP Amendment (slips) printed
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Free format text: INSERT JOURNAL 5039, PAGE 2390