MES表面活性剂的工业化精制工艺

将α-磺基脂肪酸甲酯钠盐（MES）产品（含活性物质70%）在加热熔融的状态下滴加到50~55℃低沸点水溶性有机溶剂中，经冷却、结晶、过滤和干燥，得到高纯MES粉剂产品。考察了低沸点水溶性有机溶剂种类、原料与溶剂的投料质量比、冷却温度和结晶时间等工艺条件对产品回收率、活性物质量分数和过筛率的影响，得到了最佳纯化精制工艺：以甲醇为溶剂，5 kg MES，MES与溶剂的投料质量比为1：3，冷却温度为5℃，结晶时间为120 min，干燥时间60 min，干燥温度45℃，溶剂使用3次。本工艺条件下，所制得MES粉剂产品回收率大于98%，含活性物质量分数大于93.0%，产品在40℃密封保存12 h后，过0.850 mm筛孔的筛，过筛率达100%。

Industrial Refining Process of MES Surfactant

α-sulfofatty acid methyl ester sodium salt(MES) with 70% active mass fraction product was added into 50-55 ℃ low boiling organic solvent of water soluble in heat and molten state. After cooling, crystallization, filtration and drying, high purity MES powder products were obtained. The experiment obtained the best optimum purification and refining process by investigating the low boiling organic solvent type of water soluble, feed quality ratio of raw materials and solvent, cooling temperature and crystallization time. And the optimum conditions were methanol as solvent, the mass ratio of MES and the feed 1:3, the cooling temperature 5 ℃, the crystallization time 120 min, the drying time 60 min, the drying temperature 45 ℃ and the solvent was used for three times and then distilled. Under these conditions, the recovery rate of the prepared MES powder product was greater than 98%, and the active mass fraction was greater than 93.0%. After the product was sealed and stored at 40 ℃ for 12 h, the sieving rate of sieve size of 0.850 mm reached 100%.