GB752608A - Recovery of dinitrotoluenes - Google Patents
Recovery of dinitrotoluenesInfo
- Publication number
- GB752608A GB752608A GB22841/54A GB2284154A GB752608A GB 752608 A GB752608 A GB 752608A GB 22841/54 A GB22841/54 A GB 22841/54A GB 2284154 A GB2284154 A GB 2284154A GB 752608 A GB752608 A GB 752608A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixture
- solvent
- dinitrotoluenes
- crystals
- 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
- C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
- C07C201/06—Preparation of nitro compounds
- C07C201/16—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A mixture of 2 : 4- and 2 : 6-dinitrotoluene suitable for use in the production of toluylene di-isocyanate is obtained from a mixture of dinitrotoluenes obtained by the direct nitration of toluene by cooling the mixture in the presence of a solvent to a temperature from 0 DEG to -10 DEG C., separating the crystals from the liquid phase, and washing them with fresh solvent. The solvent may be aqueous methanol, aqueous ethanol, isopropanol, aqueous acetone or mixtures of chloroform, carbon tetrachloride or aromatic hydrocarbons such as benzene, toluene, or xylene, with aliphatic hydrocarbons such as petrol, hexane, iso-octane, cyclohexane or mixtures thereof. The solvent used for washing the crystals may be used for treating a further quantity of the crude mixture of dinitrotoluenes. In examples: (1) the use of various solvents is illustrated; (2) shows the process adapted for continuous operation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE752608X | 1953-08-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB752608A true GB752608A (en) | 1956-07-11 |
Family
ID=6654706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22841/54A Expired GB752608A (en) | 1953-08-08 | 1954-08-05 | Recovery of dinitrotoluenes |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1106186A (en) |
| GB (1) | GB752608A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3799993A (en) * | 1972-08-25 | 1974-03-26 | Us Army | Process for the manufacture of trinitrotoluene |
| US3949008A (en) * | 1974-12-05 | 1976-04-06 | The United States Of America As Represented By The Secretary Of The Army | Purification of crude dinitrotoluene by extraction with C5 -C8 alkanes |
| CN113371906A (en) * | 2021-05-31 | 2021-09-10 | 湖北东方化工有限公司 | Dinitrotoluene recovery device and process |
-
1954
- 1954-08-04 FR FR1106186D patent/FR1106186A/en not_active Expired
- 1954-08-05 GB GB22841/54A patent/GB752608A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3799993A (en) * | 1972-08-25 | 1974-03-26 | Us Army | Process for the manufacture of trinitrotoluene |
| US3949008A (en) * | 1974-12-05 | 1976-04-06 | The United States Of America As Represented By The Secretary Of The Army | Purification of crude dinitrotoluene by extraction with C5 -C8 alkanes |
| CN113371906A (en) * | 2021-05-31 | 2021-09-10 | 湖北东方化工有限公司 | Dinitrotoluene recovery device and process |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1106186A (en) | 1955-12-13 |
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