The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1977
Filed:
May. 18, 1975
Applicant:
Inventors:
Kousuke Yamamoto, Ohmuta, JA;
Shinji Takenaka, Ohmuta, JA;
Kazuo Maeda, Ohmuta, JA;
Michio Mituta, Ohmuta, JA;
Assignee:
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423515 ; 2604 / ; 423184 ; 423199 ; 4235 / ; 423514 ; 203 74 ; 423551 ;
Abstract
In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left after the separation of the resulting anhydrous sodium dithionite to adjust its pH to at least 8, separating the solids precipitated, and oxidizing the filtrate with an oxidizing agent.