Study on Compound Cross-Flow Liquid-Liquid Extraction for Separating Methylal-Methanol Azeotropic System

Aiming at the raw material of a methylal-methanol azeotropic mixture (including 91.8% of methylal, 8.2% of methanol), With a certain proportion of the composite solvent as extracting agent, over 99.5% purity of methylal can be obtained with two-stage cross-flow liquid-liquid extraction combining distillation operation, while the compound extracting agent can be recycled. Compared with the traditional methods, the new technology has more obvious methanol removing effect, higher product purity, higher recovery ratio (>95%), and lower energy consumption. It’s a new feasible scheme to Separate methylal-methanol azeotropic system.