GB1040417A - Recovery of organic isocyanates from crude reaction mixtures - Google Patents
Recovery of organic isocyanates from crude reaction mixturesInfo
- Publication number
- GB1040417A GB1040417A GB1616263A GB1616263A GB1040417A GB 1040417 A GB1040417 A GB 1040417A GB 1616263 A GB1616263 A GB 1616263A GB 1616263 A GB1616263 A GB 1616263A GB 1040417 A GB1040417 A GB 1040417A
- Authority
- GB
- United Kingdom
- Prior art keywords
- isocyanate
- phases
- isocyanates
- separation
- toluene
- 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
- C07C263/18—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
Organic isocyanates are recovered from crude reaction mixtures containing them by a process comprising mixing the crude mixture with an inert solvent which dissolves the isocyanate but not the impurities, and separating the two phases so obtained, both phases being liquid throughout the separation. Preferably, the mixture is first distilled to remove a part of the isocyanate and inert diluent used in the isocyanate-forming reaction and, after the separation into phases, the isocyanate is recovered by distillation. Suitable solvents for the separation into phases are saturated aliphatic hydrocarbons of 5-10 carbon atoms, benzene, toluene and dioxane. The isocyanates which may be treated include hexyl isocyanate, tetramethylene diisocyanate, 3,31-diisocyanato dipropyl ether, cyclohexyl isocyanate, tetrahydro-a - and -b -naphthyl isocyanates, benzyl isocyanate, phenyl isocyanate, 3-nitro-4-dodecylphenyl isocyanate, m- and p-phenylene diisocyanates, 1,3,5-benzene triisocyanate and tetrahydrofurfuryl isocyanate. Others are specified also, and reference is made to the treatment of chlorinated isocyanates. Examples are given of the treatment of toluene diisocyanate prepared in known manner from toluene diamine and phosgene.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22327262A | 1962-09-12 | 1962-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1040417A true GB1040417A (en) | 1966-08-24 |
Family
ID=22835790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1616263A Expired GB1040417A (en) | 1962-09-12 | 1963-04-24 | Recovery of organic isocyanates from crude reaction mixtures |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1243178B (en) |
| GB (1) | GB1040417A (en) |
| NL (1) | NL291785A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0133538A2 (en) * | 1983-08-11 | 1985-02-27 | Bayer Ag | Process for the purification of polyisocyanates |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3430022A1 (en) * | 1984-08-16 | 1986-02-27 | Bayer Ag, 5090 Leverkusen | METHOD FOR OBTAINING PURE DIISOCYANATES |
| DE102011051467A1 (en) | 2011-06-30 | 2013-01-03 | Buss-Sms-Canzler Gmbh | Process for the recovery of tolylene diisocyanate from liquid residues of toluene diisocyanate production |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1133721B (en) * | 1959-06-12 | 1962-07-26 | Ici Ltd | Process for the removal of impurities from crude reaction solutions obtained in the production of organic isocyanates by phosgenation of primary amines in the presence of inert solvents |
-
0
- NL NL291785D patent/NL291785A/xx unknown
-
1963
- 1963-04-24 GB GB1616263A patent/GB1040417A/en not_active Expired
- 1963-05-02 DE DEO9396A patent/DE1243178B/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0133538A2 (en) * | 1983-08-11 | 1985-02-27 | Bayer Ag | Process for the purification of polyisocyanates |
| EP0133538A3 (en) * | 1983-08-11 | 1987-12-16 | Bayer Ag | Process for the purification of polyisocyanates, and the polyisocyanates so purified |
Also Published As
| Publication number | Publication date |
|---|---|
| NL291785A (en) | |
| DE1243178B (en) | 1967-06-29 |
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