METHOD OF RECOVERY OF SPENT METHANESULFONIC AND PHOSPHOROUS ACIDS, AND DRY MIXTURE THEREOF

摘要

recovery of spent methanesulfonic acid and phosphorous acid (H3PO3). SUBSTANCE: recovery process comprises treating stream of unpurified mother liquor of HCl to remove sodium ions in the form of sodium chloride, regenerating HCl-H2O by atmospheric distillation, separating and dehydrating mixture of methane sulfonic acid and phosphorous acid by vacuum distillation for recycling purposes. Substantially dry methanesulfonic acid and HCl are reused to prepare biphosphonic acids. EFFECT: simple method and high degree of recovery of spent acids. 15 cl, 6 dwg, 2 ex, 1 tbl