PROCESS FOR CHLORINATION OF A POLYMER

摘要

The present disclosure relates to a process for chlorination of a polymer. The process of the present disclosure includes minimum use of light and maximum chlorine utilization for getting maximum chlorination yield. The chlorinated polymer obtained by the process of the present disclosure exhibit improved properties viz. thermal stability, color, inherent viscosity and mechanical properties.

主权项

1. A process for chlorinating a polymer in an aqueous solution, said process comprising the following steps:
a. charging a closed vessel with polymer powder and water to obtain a suspension; b. introducing chlorine gas into said closed vessel containing said suspension till a predetermined pressure is attained to obtain a reaction mixture; c. stirring said reaction mixture to obtain a slurry; d. dissociating the chlorine molecules into chlorine radicals in two stages:
dissociating a first portion of the chlorine molecules by irradiating said slurry with radiation having a predetermined intensity and wavelength at a first predetermined temperature and predetermined pressure; andfurther dissociating a second portion of the chlorine molecules, by gradually increasing the temperature of said slurry from said first predetermined temperature to a second predetermined temperature, thereby thermally dissociating the chlorine molecules, into chlorine radicals, while gradually reducing the intensity of the radiation to zero; e. allowing said dissociated chlorine radicals to react with said polymer to obtain a mixture comprising the chlorinated polymer; and f. recovering said chlorinated polymer,wherein said process is carried out in the absence of a swelling agent, a dispersing agent and an initiator.