Process for distillatively removing dinitrotoluene from...

Details Process for distillatively removing dinitrotoluene from... Process for distillatively removing dinitrotoluene from...

2011-04-19

2011-04-19

Parsa, Jafar (Department: 1621)

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

Organic compounds

Oxygen containing

C568S927000, C568S939000, C568S940000

Reexamination Certificate

active

07928270

ABSTRACT:
A process is proposed for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating toluene with nitrating acid, which comprisesbasifying the process wastewater to a pH of >8.5,feeding it to a stripping column in the upper region thereof andstripping it with steam in countercurrent to obtaina vapor stream laden with dinitrotoluene anda bottom stream depleted in dinitrotoluene compared to the process wastewater used.

REFERENCES:
patent: 6506948 (2003-01-01), Sawicki
patent: 2004/0262238 (2004-12-01), Munnig et al.
patent: 101 43 800 (2002-08-01), None
patent: 103 56 499 (2005-06-01), None
patent: 0 953 546 (1999-11-01), None
patent: 97 38770 (1997-10-01), None

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