GB761594A - Production of isocyanates - Google Patents
Production of isocyanatesInfo
- Publication number
- GB761594A GB761594A GB11043/54A GB1104354A GB761594A GB 761594 A GB761594 A GB 761594A GB 11043/54 A GB11043/54 A GB 11043/54A GB 1104354 A GB1104354 A GB 1104354A GB 761594 A GB761594 A GB 761594A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosgene
- isocyanate
- tower
- inert diluent
- similarly prepared
- 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
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
In a process for the production of organic isocyanates by reacting a salt of a primary amine with phosgene in the presence of an inert diluent, the reactants in the presence of said diluent are passed in a continuous stream through a tube heated to a temperature of at least 50 DEG C. Amine hydrochlorides may be employed as starting materials, e.g. in mixtures with carbamyl chlorides obtained by reacting phosgene with amines or certain amine salts such as carbaminates in the presence of an inert diluent. In the apparatus in the drawing a primary amine salt phosgene and an inert diluent are passed optionally through preheater 1 to the bottom of tower 2 with additional phosgene if desired and the reaction is completed in tower 3 with additional phosgene and the isocyanate is distilled from the reacted mixture leaving the top of tower 3. Vapours <PICT:0761594/IV(b)/1> leaving towers 2 and 3 are condensed in coolers 4 and 5 and returned to the bottoms of the towers. In examples: toluylene diisocyanate is obtained by mixing toluylene diamine, phosgene and o-dichlorobenzene and passing the product through the apparatus described (1); naphthalene 1,5-diisocyanate is similarly prepared from 1,5-naphthalene diamine (2); p-ethoxyphenyl isocyanate is similarly prepared from p-phenetidine using chlorbenzene as solvent (3); octadecane-1-isocyanate is similarly prepared from octadecylamine-1 (4); a -naphthylene isocyanate is similarly obtained from a -naphthylamine (5). The products are worked up by distillation after removal of dissolved phosgene by blowing with nitrogen. Specifications 761,590 and 761,592 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE761594X | 1953-04-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB761594A true GB761594A (en) | 1956-11-14 |
Family
ID=6665590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11043/54A Expired GB761594A (en) | 1953-04-20 | 1954-04-14 | Production of isocyanates |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB761594A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3544612A (en) * | 1966-02-28 | 1970-12-01 | Toulousaine Prod Chim | Process for the production of organic isocyanates |
-
1954
- 1954-04-14 GB GB11043/54A patent/GB761594A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3544612A (en) * | 1966-02-28 | 1970-12-01 | Toulousaine Prod Chim | Process for the production of organic isocyanates |
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