The present invention addresses the need to provide a process for purifying valine having a high purity in high yield by a simple method and using an inexpensive precipitant.
A valine-containing aqueous solution is reacted with p-isopropylbenzenesulfonic acid or its water-soluble salt to form a valine p-isopropylbenzenesulfonate crystal. Valine p-isopropylbenzenesulfonate is separated and then dissociated to purify and obtain valine. The p-Isopropylbenzenesulfonic acid used may be in the form of a free acid, or a salt eg an alkali metal salt or an ammonium salt.
The procedure of forming an adduct comprising 1 mol of valine and 1 mol of p-isopropylbenzenesulfonic acid and purifying valine has the effects that since the solubility of valine p-isopropylbenzenesulfonate is low, valine may be obtained at high efficiency, and that valine may be separated at a high rate from leucine and isoleucine, which are in general hard to separate from valine, because of the specificity of the adduct. p-Isopropylbenzenesulfonic acid can be easily produced by sulfonating inexpensive isopropylbenzene.
本发明的目的是提供一种用简单的方法和廉价的沉淀剂高产率地提纯高纯度缬
氨酸的工艺。
将含缬
氨酸的
水溶液与对异丙基
苯磺酸或其
水溶性盐反应,形成缬
氨酸对异丙基
苯磺酸盐晶体。分离缬
氨酸对异丙基
苯磺酸盐,然后解离,提纯并得到缬
氨酸。所用的对异丙基
苯磺酸可以是
游离酸,也可以是盐,例如碱
金属盐或
铵盐。
形成由 1 摩尔缬
氨酸和 1 摩尔对异丙基
苯磺酸组成的加合物并提纯缬
氨酸的步骤具有以下效果:由于缬
氨酸对异丙基
苯磺酸的溶解度较低,因此可以高效率地获得缬
氨酸;由于加合物的特异性,缬
氨酸可以与亮
氨酸和
异亮氨酸高速分离,而亮
氨酸和
异亮氨酸一般很难与缬
氨酸分离。对异丙基
苯磺酸可以通过磺化廉价的异丙基苯轻松制得。