BigPatents India

The present invention relates to a batch process for producing a polyamide by reaction of a mixture comprising at least one aminonitrile, and optionally monomers with water, which comprises: (I) reacting the mixture with water to obtain a reaction mixture, (2) reacting the reaction mixture at a temperature and pressure being selected so as to obtain a fIrst gas phase and a fIrst liquid or a fIrst solid phase or a mixture of first solid and fIrst liquid phase, and the first gas phase is separated from the first liquid or the fIrst solid phase or from the mixture of fIrst liquid and first solid phase, and (3) admixing the fIrst liquid or the first solid phase or the mixture of fIrst liquid and fIrst solid phase with a gaseous or liquid phase comprising water to obtain a product mixture, wherein step (1) is carried out in the presence of a Bronsted acid catalyst or a fixed bed catalyst consisting essentially of TiO2 comprising from 70 to 100% by weight of anatase and from 0 to 30% by weight of rutile and in which up to 40% by weight of the titanium dioxide may be replaced by tungsten oxide.