Preparation Of High Purity Methanol By Purifying Industry Methanol

High purity methanol is a very important solvent for chemical industry and microelectronic industry. In this paper, the application in chemical industry and microelectronic industry, market status and the present situation of production of high purity methanol at home and abroad were introduced firstly. And then, manufacture technology and production of high purity methanol in our country were discussed. At Last, feasibility for producing high purity methanol with high added value from industrial methanol was put forward.Preparation of high purity methanol by purifying industry methanol is feasible in china.Firstly, Ion exchange resin, molecular sieve, distillation, reaction distillation and extractive distillation were examined in this paper. These experimental results showed that some kinds of ions could be removed by ion exchange resin. Partial water could be absorbed by activated molecular sieve. Batch extractive distillation is the best separation technique for purification of industrial methanol. Dimethyl sulfoxide was better than N, N-dimethylformide as an extractive solvent.An economical and feasible method of evaluating the purity of methanol was put forward in this paper. The purity of methanol was reflected by values of ultraviolet transmission of methanol and content of water, and it avoided testing the content of ion in methanol frequently because of saving high experimental expense.The influence of extractive solvent, operation principle and operation parameter on batch extractive distillation were measured. With the increase of solvent flow rate and the reflux ratio, the separation effect was improved. The best operation condition was that dimethyl sulfoxide as extractive solvent, the solvent flow rate being 597.6mL/h, the reflux ratio being 8, 5% fore-run of material methanol without solvent and 15% fore-run of material methanol with solvent, the reflux ratio being 5 and the yield of product was 60%. On such condition, the quality parameters of product almost reach ME0315 standard of methanol from JK Chemical.