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:
Nov. 09, 1976
Filed:
Nov. 26, 1975
Kenneth A Williams, Diamond Bar, CA (US);
Occidental Petroleum Corporation, Los Angeles, CA (US);
Abstract
A water immiscible amine-solvent system, preferably a solution of a water immiscible amine in mineral spirit solvent, is used to extract phosphate values from crude aqueous phosphoric acid solutions leaving behind impurities, e.g., calcium, magnesium, iron and aluminum. Phosphoric acid of water white quality may then be produced and removed from the amine-solvent organic phase by contacting the amine-solvent containing the extracted phosphate values with sulfur dioxide and water substantially in the absence of oxygen, the amount of water employed determining the concentration of phosphoric acid produced, thermally stripping the sulfur dioxide from the amine-solvent system substantially in the absence of oxygen in order to recycle both the amine-solvent system and sulfur dioxide.