Process for the preparation of dinitro-polyalkylbenzenes

Details Process for the preparation of dinitro-polyalkylbenzenes Process for the preparation of dinitro-polyalkylbenzenes

1993-06-18

1994-11-22

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568933, C07C20506

Patent

active

053671082

ABSTRACT:
Dinitro-polyalkylbenzenes can be prepared by nitration of polyalkylbenzenes using HNO.sub.3 in the presence of H.sub.2 SO.sub.4 in such a manner that at least 50% of the H.sub.2 SO.sub.4 is present as reaction medium and HNO.sub.3 and the polyalkylbenzene and any remaining H.sub.2 SO.sub.4 are added simultaneously in such a manner that the added substances polyalkylbenzene and HNO.sub.3 are in the molar ratio of 1:2-10. H.sub.2 SO.sub.4 is used at a concentration from 81 to 96% by weight and HNO.sub.3 at a concentration from 95 to 100% by weight. For the work-up, the dinitro-polyalkylbenzenes are first freed from the majority of the acids and then treated with a highly dilute aqueous solution of a dispersant for separating off residual acid.

REFERENCES:
patent: 1892128 (1932-12-01), Barbier
patent: 2864871 (1958-12-01), Morningstar
patent: 3153099 (1964-10-01), Lind
patent: 4136117 (1979-01-01), Diehl et al.
Houben-Weyl "Methoden Der Organischen Chemie", 1971, Georg Thieme Verlag, Stuttgart.
The Journal of the American Chemical Society, Jul.-Dec. 1943, E. Newton, "Polyisopropyl-benezens. II. Nitro and Amino Derivatives" vol. 65, pp. 2434-2439.
Chem. Abstracts vol. 102:62669h (1985).
Chem. Abstracts, vol. 56:11497 (1962).

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