公开(公告)号：US4520006A

公开(公告)日：1985-05-28

申请号：US552480

申请日：1983-11-17

Applicant: Charles Laviron ,  Henri Lecouls ,  Louis Mesaros

Inventor： Charles Laviron ,  Henri Lecouls ,  Louis Mesaros

IPC: C01B17/90

CPC classification number: C01B17/90

Abstract: A process for the purification of by-product sulfuric acid resulting from the synthesis of boron trifluoride, wherein the ratio of fluorine to boron is three or more, which process comprises entraining the by-product acid in an inert gas, the process being characterized in that before entrainment the anhydrous sulfuric acid is diluted with water in a proportion of from about one to about ten percent by weight of water with respect to the acid to be treated, the temperature being maintained above 90.degree. C., the sulfuric acid obtained containing less than 0.003% fluorine and less than 0.005% boron, so that the quality is substantially equivalent to a sulfuric acid directly obtained by the oxidation of sulfur.

Abstract translation: 用于纯化由合成三氟化硼产生的副产物硫酸的方法，其中氟与硼的比例为三或更多，该方法包括将惰性气体中的副产物酸夹带，该方法的特征在于 在夹带之前，无水硫酸用水以相对于待处理的酸的约1至约10重量％的比例稀释，温度保持在90℃以上，所得硫酸 小于0.003％的氟和小于0.005％的硼，使得其质量基本上等于通过硫的氧化直接获得的硫酸。

公开(公告)号：US4520001A

公开(公告)日：1985-05-28

申请号：US482465

申请日：1983-04-06

Applicant: Jean Metzger ,  Henri Lecouls ,  Philippe Colombe ,  Jean Wojcik

Inventor： Jean Metzger ,  Henri Lecouls ,  Philippe Colombe ,  Jean Wojcik

IPC: C01B33/32

CPC classification number: C01B33/32

Abstract: The process for producing a clear solution of alkali metal silicate having an SiO.sub.2 /alkali metal oxide weight ratio of 2.5 or less which comprises passing an aqueous solution of an alkali metal hydroxide through a bed of crystallized silica having an average particle size of between about 0.1 mm and 2 mm formed in the bottom of a vertical tubular reactor without mechanical agitation, said silica and alkali metal hydroxide being fed from the top of the reactor, and recovering the resulting clear solution of alkali metal silicate from the bottom of the reactor.

Abstract translation: 制备SiO 2 /碱金属氧化物重量比为2.5以下的碱金属硅酸盐透明溶液的方法，其包括使碱金属氢氧化物的水溶液通过平均粒径为约0.1的结晶二氧化硅床 mm和2mm在垂直管式反应器的底部形成，而无需机械搅拌，所述二氧化硅和碱金属氢氧化物从反应器顶部进料，并从反应器底部回收所得澄清的碱金属硅酸盐溶液。