GB1111581A - Process for the purification of organic diisocyanates - Google Patents

Process for the purification of organic diisocyanates

Info

Publication number
GB1111581A
GB1111581A GB560365A GB560365A GB1111581A GB 1111581 A GB1111581 A GB 1111581A GB 560365 A GB560365 A GB 560365A GB 560365 A GB560365 A GB 560365A GB 1111581 A GB1111581 A GB 1111581A
Authority
GB
United Kingdom
Prior art keywords
diisocyanate
purification
calcium hydroxide
organic diisocyanates
organic
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
GB560365A
Inventor
Harry James Twitchett
James Harry Wild
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB560365A priority Critical patent/GB1111581A/en
Publication of GB1111581A publication Critical patent/GB1111581A/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

Landscapes

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

Abstract

The hydrolysable chlorine content of an undistilled organic diisocyanate, obtained by phosgenation of a diamine, is reduced by contacting the diisocyanate with calcium hydroxide under conditions no more strenuous than those of heating at 140 DEG C. for 5 1/2 hours and then removing the solid inorganic matter from the diisocyanate. The treatment with the calcium hydroxide, which is generally employed in a stoichiometric excess, may be effected in an inert diluent. A specified diisocyanate is tolylene diisocyanate.
GB560365A 1965-02-09 1965-02-09 Process for the purification of organic diisocyanates Expired GB1111581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB560365A GB1111581A (en) 1965-02-09 1965-02-09 Process for the purification of organic diisocyanates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB560365A GB1111581A (en) 1965-02-09 1965-02-09 Process for the purification of organic diisocyanates

Publications (1)

Publication Number Publication Date
GB1111581A true GB1111581A (en) 1968-05-01

Family

ID=9799198

Family Applications (1)

Application Number Title Priority Date Filing Date
GB560365A Expired GB1111581A (en) 1965-02-09 1965-02-09 Process for the purification of organic diisocyanates

Country Status (1)

Country Link
GB (1) GB1111581A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391161B1 (en) 1999-03-30 2002-05-21 Bayer Aktiengesellschaft Method for reducing the chlorine content of low molecular weight isocyanates
US6395925B1 (en) 1999-05-17 2002-05-28 Bayer Aktiengesellschaft Process for purifying organic isocyanates, the organic isocyanates so purified and their use

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6391161B1 (en) 1999-03-30 2002-05-21 Bayer Aktiengesellschaft Method for reducing the chlorine content of low molecular weight isocyanates
US6395925B1 (en) 1999-05-17 2002-05-28 Bayer Aktiengesellschaft Process for purifying organic isocyanates, the organic isocyanates so purified and their use

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