GB575133A - Improvements in or relating to the manufacture of dinitrotoluene - Google Patents

Improvements in or relating to the manufacture of dinitrotoluene

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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
Application number
GB16736/43A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hercules Powder Co
Original Assignee
Hercules Powder Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hercules Powder Co filed Critical Hercules Powder Co
Publication of GB575133A publication Critical patent/GB575133A/en
Expired legal-status Critical Current

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  • 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.
GB16736/43A 1943-02-10 1943-10-12 Improvements in or relating to the manufacture of dinitrotoluene Expired GB575133A (en)

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)

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