Tokyo-Sumitomo Chemical Co. Ltd says it has signed an agreement to license its proprietary oxidation process for hydrochloric acid to Mitsubishi Chemical Co. Ltd.
Sumitomo said in a 28 June announcement that its "highly efficient process takes hydrogen chloride co-produced in the manufacturing of urethane and other products that use chlorine as a raw material and converts it into chlorine using a proprietary high-activity catalyst developed in-house by Sumitomo." The process was given the Japanese 'Green Sustainable Chemistry Prize' last year for being energy-efficient and environmentally benign. "It has been acknowledged for its innovation both in Japan and overseas," the group said.
Mitsubishi had developed a cost-competitive melt process for the manufacture of polycarbonate, according to Sumitomo, but wanted to boost cost-competitiveness further by reducing environmental impact.
After comparing various technologies Mitsubishi decided to adopt the Sumitomo process for converting HCl to chlorine, "as the one that best met its needs," said Sumitomo's statement.
Sumitomo said it first licensed the process in 2002, and intends to continue actively licensing it both in Japan and overseas "to promote green chemistry that minimises environmental impact through the efficient utilisation of resources."