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:
Jun. 05, 2018
Filed:
Dec. 15, 2016
Tessenderlo Kerley, Inc., Phoenix, AZ (US);
Michael Massoud Hojjatie, Tucson, AZ (US);
Constance Lynn Frank Lockhart, Tucson, AZ (US);
Alexandros Dimitriadis, Chandler, AZ (US);
Mark P. Clarkson, Gilbert, AZ (US);
Harry Charles Kominski, Phoenix, AZ (US);
Jeroen Van Cauwenbergh, Baardegem, BE;
Nicholas S. Shult, Maricopa, AZ (US);
Adam T. Goldsmith, Chandler, AZ (US);
Tessenderlo Kerley, Inc., Phoenix, AZ (US);
Abstract
An efficient process for preparation of potassium thiosulfate (KSO) is described. Potassium hydroxide (KOH) and elemental sulfur (S) are converted to potassium polysulfide, which is subsequently oxidized. The process allows using specifically designed process conditions such as mole ratios of potassium hydroxide to sulfur, and temperature, to obtain an optimized formulation of desired polysulfide, and a specifically designed set of conditions such as temperature, pressure, rate and duration of the oxidant during the oxidation conditions, to obtain a relatively high concentration of soluble potassium thiosulfate product with high purity, with relatively low amounts of byproducts. The manufacturing process can either be a batch process or a continuous process utilizing Continuous Stirred Tank Reactors (CSTR). The CSTR process is dependent on several design parameters, including pressure, and temperature optimization to avoid product instability. The resulting potassium thiosulfate is a beneficial fertilizer with high potassium content as a 50% liquid source of potassium.