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:
Dec. 10, 1985
Filed:
Sep. 21, 1984
Graham W Scott, Northwich, GB;
James H Steven, Runcorn, GB;
Imperial Chemical Industries PLC, London, GB;
Abstract
The ratio of silica to alkali in silicate liquors is increased, for example to convert alkaline grades to neutral grades, by passing the liquors through an electrodialysis stack comprising alternating cation exchange membranes and bipolar membranes mounted between an anode and a cathode, the membranes forming a concentrating cell between the anion exchange side of the bipolar membrane and the adjacent cation exchange membrane and a diluting cell between the cation exchange side of the bipolar membrane and the adjacent cation exchange membrane, the method comprising passing the silicate liquor through the diluting cells in the stack and passing water or an aqueous solution through the concentrating cells, whereby the silicate liquor is caused to lose alkali metal ions to the concentrating liquor and receive hydrogen ions from the bipolar membranes.