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. 03, 1982
Filed:
May. 21, 1980
Charles D Baker, Uttoxeter, GB;
Brewing Patents Limited, , GB;
Abstract
A method of purifying aqueous solutions of iso-.alpha.-acids by removing .beta.-acids therefrom comprises first bringing the solution to an iso-.alpha.-acid concentration of 0.5% to 10% .sup.w /w, particularly 0.5% to 5% .sup.w /w, then reducing the pH to a value in the range 7 to 10, preferably 8 to 9, so as to form an easily filtered precipitate of .beta.-acids. Preferably pH reduction is effected by bubbling carbon dioxide through the solution. The separated iso-.alpha.-acid solution may be concentrated to an extent that a phase separation takes place into two aqueous phases one of which has a higher iso-.alpha.-acid concentration than the other. The recovered iso-.alpha.-acid solution is suitable for direct addition to beer without haze formation.