Method for preparing sodium soap

一种制备钠皂的方法

Abstract

The invention relates to a method for preparing sodium soap. The method comprises the following steps of: dissolving grease in an organic solvent of which the mass is 1-5 times of that of the grease, putting the mixed liquid into a batch reactor with a condensing and refluxing device in the absence of water, heating the mixed liquid to 120-200 DEG C until the mixed liquid is boiling, slowly adding powdery solid sodium hydroxide of which the mass is 0.1-0.5 times of that of the grease, fiercely stirring for saponification, so as to obtain sodium soap, glycerin, unsaponifiable matters and residual alkali; after the reaction is ended, cooling products at -10-20 DEG C, separating the sodium soap out of the solution, filtering out the organic solvent in a suction manner, and drying a filter cake in a drying oven at 30-80 DEG C, so as to obtain a sodium soap product mixed with a small amount of residual alkali, wherein the alkali content is lower than national standards; and dissolving the glycerin and the unsaponifiable matters into the organic solvent, and circularly utilizing the organic solvent after distilling the organic solvent. The method disclosed by the invention is simple, efficient and environment-friendly, is low in use amount of solid alkali and applicable to preparation of the sodium soap of various oil products; the obtained product is high in yield, contents less free caustic alkali and few impurities and is pure white in color; and the disadvantages of complex operation, low product yield and high impurity content in the product in the conventional sodium soap preparation process are overcome.
本发明涉及一种制备钠皂的方法,将油脂溶解于质量为油脂1~5倍的有机溶剂中,在无水条件下,将该混合液置于带有冷凝回流装置的间歇反应器中,加热至120~200℃,使其沸腾,缓慢加入质量为油脂质量的0.1~0.5倍的粉末状固体氢氧化钠,剧烈搅拌,进行皂化反应,得到钠皂、甘油、不皂化物及残碱;反应结束后,将产物在-10~20℃下冷却,钠皂从溶液中析出,抽滤出有机溶剂,滤饼在30~80℃的烘箱中干燥2h,即得混有少量残碱的钠皂产品,碱含量低于国家标准;甘油及不皂化物溶解于有机溶剂中,有机溶剂经蒸馏后循环利用。本发明方法简单、高效、环保,固体碱用量少,适用于各种油品的钠皂的制备,所得产品产率高,游离苛性碱含量低,杂质少,色洁白,克服了传统钠皂制备过程中操作复杂,产品产率低,产物杂质含量高的缺点。

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    Title
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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    CN-104818153-AAugust 05, 2015阚立东Method for using swill-cooked dirty oil to produce soap powder
    CN-104818153-BSeptember 29, 2017阚立东一种利用地沟油制造肥皂粉的方法