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. 18, 2001
Filed:
Oct. 01, 1999
Kurt J. Waatti, Crystal Lake, IL (US);
Eugene J. Kuhajek, Crystal Lake, IL (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
The monosodium and monopotassium citrates are improved iron-sequestering agents in salt compositions for regenerating spent water softener cation exchange resins. The dry compositions comprise a surfactant, an alkali metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an iron sequestering agent selected from the group consisting of monosodium citrate and monopotassium citrate. The composition is preferably provided in the form of compacted pellets or blocks. The method for regenerating the spent cation exchange resin bed comprises the step of contacting the resin bed with an aqueous brine solution containing the citrate and a surfactant and having a pH of about 3.5 to 4.5.