PRODUCING SOLVENT-GRADE METHYL-NAPHTHALENE

摘要

PRODUCING SOLVENT-GRADE METHYL-NAPHTHALENE A methylnaphthalene-containing coal tar distillation fraction which has already been extracted with base to remove tar acids is treated by three extractions to remove tar bases and impurities which have or form color or odor. No final distillation is required. The first extraction is with about 70-85% sulfuric acid, the second with about 90-100% sulfuric acid and the third with aqueous base such as about 2-25% sodium hydroxide. The resultant methyl-naphthalene is suitable for dye-carrier and other solvent applications.