GB821220A - A process for the production of toluylene diamines - Google Patents
A process for the production of toluylene diaminesInfo
- Publication number
- GB821220A GB821220A GB19865/58A GB1986558A GB821220A GB 821220 A GB821220 A GB 821220A GB 19865/58 A GB19865/58 A GB 19865/58A GB 1986558 A GB1986558 A GB 1986558A GB 821220 A GB821220 A GB 821220A
- Authority
- GB
- United Kingdom
- Prior art keywords
- methanol
- dinitrotoluene
- toluylene diamine
- raney nickel
- toluylene
- 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
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/30—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds
- C07C209/32—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups
- C07C209/36—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing gases and a catalyst
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
2,4- and 2,6-toluylene diamine is prepared by continuously hydrogenating 2,4- and/or 2,6-dinitrotoluene in the liquid phase in an organic solvent at a temperature of more than 120 DEG C. and at a pressure above 50 atmospheres in the presence of Raney nickel. The reaction preferably takes place at 150-170 DEG C. in the presence of methanol, dioxane or tetrahydrofuran and the nitrated reactant may be admixed with toluylene diamine if desired. In an example, a mixture containing dinitrotoluene, methanol, toluylene diamine, water and Raney nickel, obtained by adding fresh dinitrotoluene, methanol and Raney nickel to a sample of the unfiltered product, is hydrogenated at 170 DEG C. and 50-100 atm. in a reactor comprising 4 vessels connected in series through which the reaction mixture and hydrogen are pumped. Some of the product is separated for recycle with fresh dinitrotoluene and the remainder is freed of catalyst, methanol and water, and the crude toluylene diamine distilled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE821220X | 1957-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB821220A true GB821220A (en) | 1959-10-07 |
Family
ID=6739535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19865/58A Expired GB821220A (en) | 1957-06-27 | 1958-06-20 | A process for the production of toluylene diamines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB821220A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857565A (en) * | 1986-02-08 | 1989-08-15 | Bayer Aktiengesellschaft | Process for the continuous production of aqueous polyurethane dispersions and their use as a coating composition or as an adhesive |
| EP1138665A1 (en) * | 2000-03-28 | 2001-10-04 | Rhodia Chimie | Continuous hydrogenation of aromatic nitro compounds using a catalyst with low aluminium content |
-
1958
- 1958-06-20 GB GB19865/58A patent/GB821220A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857565A (en) * | 1986-02-08 | 1989-08-15 | Bayer Aktiengesellschaft | Process for the continuous production of aqueous polyurethane dispersions and their use as a coating composition or as an adhesive |
| EP1138665A1 (en) * | 2000-03-28 | 2001-10-04 | Rhodia Chimie | Continuous hydrogenation of aromatic nitro compounds using a catalyst with low aluminium content |
| FR2807036A1 (en) * | 2000-03-28 | 2001-10-05 | Rhodia Chimie Sa | CONTINUOUS HYDROGENATION OF AROMATIC NITER COMPOUNDS USING A LOW ALUMINUM CATALYST |
| US6423872B2 (en) | 2000-03-28 | 2002-07-23 | Rhodia Chimie | Continuous Ni/low A1 catalyzed hydrogenation of aromatic nitro compounds |
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