1-Chloro-2-nitrobenzene → Disulfide, bis(2-nitrophenyl)

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1300 parts of water containing 150 parts of castor oil ethoxylate and 250 parts of 1-chloro-2-nitrobenzene are charged to a reactor and heated to 60° C. with thorough mixing. Simultaneous addition is then made of 2268 parts of disulfide solution (preparation as described in Example 1) and 2250 parts of 1-chloro-2-nitrobenzene in separate streams. The rate of addition is 400 parts per hour. When the total amount of chloronitrobenzene has been added, the remaining amount of disulfide is added at a rate of 100 parts per hour. The reaction is slightly exothermic and the temperature is kept in the range from 60°-65° C. by cooling. During the reaction, both the continuously added chloronitrobenzene and the resultant disulfide are continuously dispersed in the reaction mixture. This is done by constant and intensive mixing. Agglomerates are comminuted with a dismembrator. After the total amount of disulfide has been added as well, stirring is continued until the reaction mass consists of individual yellow crystals and of a colourless to tea-coloured mother liquor. The batch is then cooled to 40° C. and filtered. The product is washed with cold water until the washings are colourless, affording 2,2'-dinitrodiphenyl disulfide which contains about 5% of by-products. The yield is 95%.

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