Batch process for making high flash point pitch

摘要

A method for producing a high-flash-point impregnating pitch that comprises charging coal tar into a batch still; heating the coal tar to an intermediate liquid state of soft pitch; maintaining the intermediate temperature of the soft pitch at a steady level; and introducing sparging gas while maintaining the temperature of the coal tar at a substantially steady level. The method of the present invention provides a pitch that has a softening point of about 90° C. and a flash point of above about 270° C.