GB575133A - Improvements in or relating to the manufacture of dinitrotoluene - Google Patents
Improvements in or relating to the manufacture of dinitrotolueneInfo
- Publication number
- GB575133A GB575133A GB16736/43A GB1673643A GB575133A GB 575133 A GB575133 A GB 575133A GB 16736/43 A GB16736/43 A GB 16736/43A GB 1673643 A GB1673643 A GB 1673643A GB 575133 A GB575133 A GB 575133A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitric acid
- separated
- mononitrotoluene
- acid
- still
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Dinitrotoluene, particularly the 2.4-isomer, is made by the nitration of toluene with nitric acid in the absence of sulphuric acid, the toluene first being treated with nitric acid of from 60 to 75 per cent strength, the mol. ratio of toluene to nitric acid being about 1 to 3.5 and the temperature being about 75 DEG to 80 DEG C., to produce mononitrotoluene, which is then treated with nitric acid of from 90 to 100 per cent strength, the mol. ratio of mononitrotoluene to nitric acid being about 1 to 3 and the temperature being about 75 DEG to 80 DEG C. In a preferred embodiment of the invention, after the mononitration step, the mononitrotoluene and the acid are separated and the former passed to the dinitrator and the latter to a still from which approximately 70 per cent nitric acid is returned to the acid supply. The residue from the still is separated to recover any mononitrotoluene present, 98 per cent nitric acid is added to the dinitrator and after nitration is complete, the mixture is transferred to a vacuum still where the nitric acid is separated and subsequently concentrated. The crude dinitrotoluene is washed twice with hot water, neutralized in a sodium sulphite solution and subjected to an ethyl alcohol treatment, whereby crystals of the 2.4-isomer are separated out. These are separated by centrifuge and the remaining alcohol is passed to a still where the alcohol is separated for re-use and dinitrotoluene oil, comprising mostly the 2.6-isomer, is obtained. The products may be used per se in explosives or may be nitrated further to trinitrotoluene.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US575133XA | 1943-02-10 | 1943-02-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB575133A true GB575133A (en) | 1946-02-05 |
Family
ID=22011031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16736/43A Expired GB575133A (en) | 1943-02-10 | 1943-10-12 | Improvements in or relating to the manufacture of dinitrotoluene |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB575133A (en) |
-
1943
- 1943-10-12 GB GB16736/43A patent/GB575133A/en not_active Expired
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