公开(公告)号：US3922154A

公开(公告)日：1975-11-25

申请号：US39507273

申请日：1973-09-07

Applicant: AGENCY IND SCIENCE TECHN

Inventor： KAWASAKI SHIGETAKE ,  OWA MASARU ,  HAYANO ICHIRO ,  AKIYA TAKAJI ,  TAKEUCHI NORIO ,  GOTO TOTARO ,  ISHIZAKA SEIICHI

IPC: B01D9/00 ,  B01D9/02 ,  C01D1/30 ,  B01D9/04 ,  C01D1/32

CPC classification number: C01D1/30 ,  B01D9/0009 ,  B01D9/004 ,  B01D9/0059 ,  Y10S159/05

Abstract: A method for purification of sodium hydroxide, wherein a crude caustic alkali concentrate obtained by the electrolysis of a sodium chloride-containing solution is brought into direct contact with a refrigerant incapable of dissolving said concentrate so as to cool the concentrate and consequently precipitate sodium hydroxide crystals and the precipitated sodium hydroxide crystals are separated and then melted by utilizing the heat of liquefaction of said refrigerant to produce highly purified melted sodium hydroxide.

Abstract translation: 一种纯化氢氧化钠的方法，其中将通过电解含氯化钠的溶液获得的粗苛性碱浓缩物与不能溶解所述浓缩物的制冷剂直接接触，以冷却浓缩物，从而沉淀氢氧化钠晶体 分离沉淀的氢氧化钠晶体，然后利用所述制冷剂的液化热进行熔融，得到高纯度的熔融氢氧化钠。