Method for producing high purity chemicals
AssigneesTama Chemicals Co., Ltd., Moses Lake Industries, Inc.
InventorsShumpei Shimizu, Mamoru Yoshizako, Toshitsura Cho
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Abstract
A distillable liquid containing non-volatile impurities is freed of those impurities by boiling the liquid to form vapors of the liquid, passing the vapors through a packed column heated to a temperature such that liquid entrained in the vapors is completely vaporized and the non-volatile impurities remain in the packed column, and condensing the vapors from the column.
Claims4
A method for the distillation in a distillation device of an inorganic acid having non-volatile matter impurities therein, said distillation device comprising a heating section, a contacting section and a condensing section, to obtain the inorganic acid essentially free of non-volatile matter impurities, said method consisting essentially of:
- (a) boiling the inorganic acid in the heating section to form vapors of the inorganic acid;
- (b) contacting the vapors of the inorganic acid from the heating section with a contact member inert to said vapors in the contacting section, said vapors being passed through the contacting section at a flow rate of 0.01 to 10 sec.sup.-1 per unit volume of the contacting section;
- (c) heating the contacting section at a temperature of 1 to 100.degree. C. higher than the boiling point of the inorganic acid being distilled and maintaining the inorganic acid completely vaporized in the contacting section;
- and
- (d) condensing the vapors from the contacting section in the condensing section.
Dependencies are inferred from the claim text.