GB893729A - Improvements in and relating to the preparation of aromatic isocyanates - Google Patents

Improvements in and relating to the preparation of aromatic isocyanates

Info

Publication number
GB893729A
GB893729A GB25793/59A GB2579359A GB893729A GB 893729 A GB893729 A GB 893729A GB 25793/59 A GB25793/59 A GB 25793/59A GB 2579359 A GB2579359 A GB 2579359A GB 893729 A GB893729 A GB 893729A
Authority
GB
United Kingdom
Prior art keywords
phosgene
chlorobenzene
aromatic
maintained
reacting
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
GB25793/59A
Inventor
Oscar Hugo Johnson
Harold Kenneth Latourette
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.)
FMC Corp
Original Assignee
FMC Corp
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 FMC Corp filed Critical FMC Corp
Priority to GB25793/59A priority Critical patent/GB893729A/en
Publication of GB893729A publication Critical patent/GB893729A/en
Priority to BE630754A priority patent/BE630754Q/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
    • C07C265/00—Derivatives of isocyanic acid
    • C07C265/12—Derivatives of isocyanic acid having isocyanate groups bound to carbon atoms of six-membered aromatic rings
    • 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

Aromatic isocyanates are prepared by reacting phosgene with an aromatic primary amine in an inert organic solvent said reaction being initiated and maintained at a temperature within the range of 60 DEG C. to 90 DEG C. to produce an intermediate product containing carbamyl chloride, and reacting the intermediate product in the presence of phosgene at a predetermined higher temperature to produce the aromatic isocyanate. An excess of phosgene is preferably employed. The reaction may be carried out batchwise or continuously. In an example a solution of m-phenylene diamine in chlorobenzene heated to 75 DEG C. is gradually added together with excess phosgene to a saturated solution of phosgene in chlorobenzene heated to 80 DEG C., the mixture is maintained at 80 DEG C.-85 DEG C. until all the diamine is added and then refluxed, allowed to cool and the chlorobenzene distilled off to leave a residue of m-phenylene diisocyanate. The following compounds are similarly prepared in examples: 2 : 4-tolylene diisocyanate, m-chlorophenyl isocyanate and tris-(4-isocyano-phenyl)-methane.
GB25793/59A 1959-07-28 1959-07-28 Improvements in and relating to the preparation of aromatic isocyanates Expired GB893729A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB25793/59A GB893729A (en) 1959-07-28 1959-07-28 Improvements in and relating to the preparation of aromatic isocyanates
BE630754A BE630754Q (en) 1959-07-28 1963-04-08 Improvements in the preparation of aromatic isocyanates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25793/59A GB893729A (en) 1959-07-28 1959-07-28 Improvements in and relating to the preparation of aromatic isocyanates

Publications (1)

Publication Number Publication Date
GB893729A true GB893729A (en) 1962-04-11

Family

ID=10233400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25793/59A Expired GB893729A (en) 1959-07-28 1959-07-28 Improvements in and relating to the preparation of aromatic isocyanates

Country Status (1)

Country Link
GB (1) GB893729A (en)

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