TH9445A - The process for the manufacture of dinitrotoluene uses inorganic salts as a substance that separates the phase. - Google Patents

Abstract

This invention deals with a process for nitrate towerluene to dinitrate towerluene and the phase separation of the product using organic salts as a phase separation agent.The process involves (a ) Let the luene react with nitronitric acid with an acid concentration between approximately 60 and approximately 75% to produce a monototoluene, (b) a mononitroylluene. It reacts with concentrated nitric acid to produce a mixture of dinotropluene and inactive nitric acid, (c) mixed with inorganic salts which are the reagents. Phase separation Incorporates into the mixture, causing phase separation of the substance.

Claims (9)

1.Process for producing dinitrotoluene and causing separation The phase of dinidetroluene is produced from product mixtures that It has the following characteristics: (a) the toluene reacts with nitric acid, which is concentrated. Of acids between approximately 60 and approximately 75 percent by weight Compared to the total weight of acid plus water At do temperature The reaction was between approximately 60 C and about 75 C and nitric acid was used between approximately 3 and approximately 5 mol per mole of toluene. Produce mononitrotoluene, (b) produces the mentioned mononitrotoluene reacts with nitric acid. Concentrate, which has acidic concentrations between approximately 90 and approximately 100% by weight of the total weight. Of acid plus water contained in this At the reaction temperature between about 40 C and about 70 C and concentrated nitric acid. Between approximately 3 and approximately 4 moles per mol of mononitrotluene. Produced to mixtures containing dinitrotoluene and inactive nitric acid and (c) incorporated inorganic salts into the above mixtures, resulting in The phase cycle of the aforementioned dinitrotluene occurred from The inactive nitric acid mentioned in the mixtures discussed above. 2. The process of claim No. 1 that is unique in that The above inorganic salts can be selected from the group that includes Inorganic subphtheon salt Inorganic nitrile salt And combined salt Together of that substance 3. The process of claim No. 1 that is unique in that The above inorganic salts can be selected from the group that includes Sodium nitrate, sodium sulphate, magnesium nitrate hexahydrate, and their mixed salt. 4. The process of claim No. 1 that is unique in that May add the inorganic salt as mentioned before During or after step (a) or step (b) to mix the said inorganic salt And then incorporated into the aforementioned mixtures to separate the aforementioned phases 5. The process of claim No. 1 is unique in that The nitric acid of the mentioned stages (a) has the acidic concentration Between approximately 60 and approximately 70% by weight compared to the total weight of acid plus water. 6. The process of claim No. 1 that is unique in that The nitric acid of the said step (b) has the acidic concentration Between approximately 95 and approximately 100 percent by weight Compared to the total weight of acid plus water 7. The process of claim No. 1 that is unique in that The inorganic salt is added before the step (a) and it is unique in that the mentioned salt is used in mole enough. Just to get the inorganic salts between 25 percent and 100 percent of the fully saturated concentration in the aforementioned nitric acid (a). 8. The process of claim No. 1 is unique in that The inorganic salt is added before step (b), and it is unique in that the said salt is used in mole enough. Just get the inorganic salt between 25 percent and 100 percent of the fully saturated concentration in the aforementioned nitric acid (b). 9. The process of claim No. 1 that is unique in that The phase reaction (a) is between approximately 1 and approximately 5 hours. 0. The process of claim No. 1 that is unique in that The phase reaction (b) lasts between approximately 1 hour and approximately 5 hours.