GB763535A - Preparation of organic isocyanates - Google Patents

Preparation of organic isocyanates

Info

Publication number
GB763535A
GB763535A GB26416/54A GB2641654A GB763535A GB 763535 A GB763535 A GB 763535A GB 26416/54 A GB26416/54 A GB 26416/54A GB 2641654 A GB2641654 A GB 2641654A GB 763535 A GB763535 A GB 763535A
Authority
GB
United Kingdom
Prior art keywords
phosgene
amine
tolylene
benzidine
reservoir
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
GB26416/54A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB763535A publication Critical patent/GB763535A/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
    • C07C263/10—Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
    • 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
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C265/00—Derivatives of isocyanic acid
    • C07C265/02—Derivatives of isocyanic acid having isocyanate groups bound to acyclic carbon atoms
    • C07C265/04—Derivatives of isocyanic acid having isocyanate groups bound to acyclic carbon atoms of a saturated carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C265/00—Derivatives of isocyanic acid
    • C07C265/14—Derivatives of isocyanic acid containing at least two isocyanate groups bound to the same carbon skeleton

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process of manufacturing organic isocyanates from organic amines and phosgene includes passing an inert solvent solution of an amine into an organic solvent solution of phosgene, at least 1.25 mols. of phosgene being present per equivalent -NH2 group of the amine, the reaction being conducted under superatmospheric pressure and under conditions of turbulent flow while maintaining the temperature above that at which the carbamyl chloride of the particular amine employed is decomposed. Solvents mentioned include mono- and o- and p - dichlorobenzenes, trichlorobenzenes, the corresponding toluenes and xylenes, chloroethylbenzene, monochlorodiphenyl and a - and b -naphthyl chlorides. Amine starting materials mentioned include aniline, toluidine, benzidine, naphthylamines, 2,4- and 2,6-tolylene diamines, the phenylene diamines, 4,41-diamino diphenyl methane, 1,5-naphthalene diamine, 1-amino-3-(4-aminophenyl) propane, anisidine or chloranilines. Diisocyanates are obtained in examples by pumping o-dichlorobenzene from a reservoir through heated stainless steel or glass tubular reactors into which phosgene and then the amines in solution are introduced and the mixtures are returned to the reservoir, 2,4-tolylene diisocyanate being obtained when using m-tolylene diamine as starting material (1-3, 5-7), and methylene bis-(phenylisocyanate) (1 and 4) and 4,41-diphenyl isocyanate (1) respectively, when using methylene bis-(4-phenylamine) and benzidine as starting materials.
GB26416/54A 1954-03-15 1954-09-13 Preparation of organic isocyanates Expired GB763535A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US763535XA 1954-03-15 1954-03-15

Publications (1)

Publication Number Publication Date
GB763535A true GB763535A (en) 1956-12-12

Family

ID=22131464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26416/54A Expired GB763535A (en) 1954-03-15 1954-09-13 Preparation of organic isocyanates

Country Status (1)

Country Link
GB (1) GB763535A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7547801B2 (en) 2006-06-26 2009-06-16 Bayer Materialscience Llc Process for the continuous preparation of isocyanates
US7851648B2 (en) 2002-12-19 2010-12-14 Basf Aktiengesellschaft Method for the continuous production of isocyanates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7851648B2 (en) 2002-12-19 2010-12-14 Basf Aktiengesellschaft Method for the continuous production of isocyanates
US7547801B2 (en) 2006-06-26 2009-06-16 Bayer Materialscience Llc Process for the continuous preparation of isocyanates

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