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。

公开(公告)号：US3658486A

公开(公告)日：1972-04-25

申请号：US3658486D

申请日：1969-08-26

Applicant: AGENCY IND SCIENCE TECHN

Inventor： GOTO TOTARO

IPC: B01D11/04 ,  C01F17/00 ,  C22B59/00 ,  B01D11/00 ,  C01G57/00

CPC classification number: C22B59/00 ,  B01D11/0492

Abstract: This invention relates to a process for the purification of yttrium which comprises adding ammonium thiocyanate to an impure aqueous solution of yttrium containing as contaminants mainly heavy rare earth elements as impurities, further adding to the resulting mixture, as a solvent, a quaternary ammonium salt containing cyclohexyl radicals, straight chain alkyl radicals and at least one methyl radical but containing no aryl radical, or a composite solvent system consisting of a quaternary ammonium salt and a trialkylphosphine oxide or a triarylphosphine oxide, and extracting the heavy rare earth elements in said aqueous solution into the solvent phase thereby leaving the yttrium in the aqueous phase.

Abstract translation: 本发明涉及一种纯化钇的方法，该方法包括将硫氰酸铵添加到不纯的含有作为杂质的重稀土元素的污染物的钇水溶液中，进一步将所得混合物作为溶剂加入含有 环己基，直链烷基和至少一个甲基，但不含芳基，或由季铵盐和三烷基氧化膦或三芳基氧化膦组成的复合溶剂体系，并提取所述水溶液中的重稀土元素 进入溶剂相，由此将钇置于水相中。