A process for the preparation of a compound of formula (I) wherein R.sub.1 is hydrogen, fluoro or chloro; which process comprises: a) reacting a compound of formula (II) wherein R.sub.1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III) wherein R.sub.1 is hydrogen, fluoro or chloro; b) reacting the compound of formula (III) with trichloroisocyanuric acid in the presence of sulfuric acid or fuming sulfuric acid to the compound of formula (IV) wherein R1 is hydrogen, fluoro or chloro; and c) reacting the compound of formula (III) with chlorine gas at a temperature from 180° C. to 250° C. to the compound of formula (I).

##STR00001##

A process for the preparation of a compound of formula (I) wherein R.sub.1 is hydrogen, fluoro or chloro; which process comprises: a) reacting a compound of formula (II) wherein R.sub.1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III) wherein R.sub.1 is hydrogen, fluoro or chloro; b) reacting the compound of formula (III) with trichloroisocyanuric acid in the presence of sulfuric acid or fuming sulfuric acid to the compound of formula (IV) wherein R1 is hydrogen, fluoro or chloro; and c) reacting the compound of formula (III) with chlorine gas at a temperature from 180° C. to 250° C. to the compound of formula (I).

##STR00001##

A process for the preparation of a compound of formula (I) wherein R.sub.1 is hydrogen, fluoro or chloro; which process comprises: a) reacting a compound of formula (II) wherein R.sub.1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III) wherein R.sub.1 is hydrogen, fluoro or chloro; b) reacting the compound of formula (III) with trichloroisocyanuric acid in the presence of sulfuric acid or fuming sulfuric acid to the compound of formula (IV) wherein R1 is hydrogen, fluoro or chloro; and c) reacting the compound of formula (III) with chlorine gas at a temperature from 180° C. to 250° C. to the compound of formula (I).

##STR00001##

The invention relates to a process for the preparation of a compound of formula I (I), wherein R.sub.1 is hydrogen, fluoro or chloro; which process comprises a) reacting a compound of formula II (II), wherein R.sub.1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III), wherein R.sub.1 is hydrogen, fluoro or chloro; and b) reacting the compound of formula III with chlorine gas at temperature from 180° C. to 250° C. to the compound of formula I.

##STR00001##

The invention relates to a process for the preparation of a compound of formula I (I), wherein R.sub.1 is hydrogen, fluoro or chloro; which process comprises a) reacting a compound of formula II (II), wherein R.sub.1 is hydrogen, fluoro or chloro; with a nitration agent to the compound of formula (III), wherein R.sub.1 is hydrogen, fluoro or chloro; and b) reacting the compound of formula III with chlorine gas at temperature from 180° C. to 250° C. to the compound of formula I.

##STR00001##

The present invention provides a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated to a temperature of from 150° C. to 500° C. under an increased pressure with respect to atmospheric pressure with exclusion of oxygen; (ii) a base is added to the waste water obtained in (i); and (iii) the waste water obtained in (ii) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.

The present invention provides a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated to a temperature of from 150° C. to 500° C. under an increased pressure with respect to atmospheric pressure with exclusion of oxygen; (ii) a base is added to the waste water obtained in (i); and (iii) the waste water obtained in (ii) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.

The invention relates to a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and expanded; (ii) the waste water obtained in (i) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.; and (iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.

The invention relates to a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and expanded; (ii) the waste water obtained in (i) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.; and (iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.

The invention relates to a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and expanded; (ii) the waste water obtained in (i) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.; and (iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.