S.a. Texaco Belgium N.v.

Sylvain A Dewaele

Lothar G Dulog

Antoine Benoit

Andre Verhelst

This invention relates to a process of catalytically converting nitrobenzene to 2-amino-3H-azepines by the reaction of the nitrobenzene with trisaminophosphine and an amine of the formula HNR'.sub.2, where R' is lower alkyl containing 1 to 6 carbon atoms. In addition, this invention concerns the catalytic hydrogenation of 2-amino-3H-azepine to epsilon caprolactam.

Conversion of 2-dialkylamino-3H-azepines into epsilon caprolactams

Disclosed is a process for purifying an effluent containing acids such as phosphonic and phosphoric acids by the addition of CaO or Ca(OH).sub.2 in an amount ranging from 55-93 per cent by weight basis acids at a temperature of 35.degree. to 100.degree. C to a pH of 8 to 12. After removing the precipitated material, the effluent can be neutralized with CO.sub.2 gas. The precipitate can be calcined to tri calcium phosphate.

Process for treating an acidic waste water stream

Disclosed is a process for making ortho- and para-chlorophenols by treating alpha-cumylchloride with an aqueous hydrogen peroxide solution. The two products can be separated by distillation.

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Evergem, Belgium

Sylvain A Dewaele