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:
Jan. 26, 1993
Filed:
Feb. 13, 1990
Magnus Kvant, Niederroedern, FR;
Kjell Stendahl, Helsingborg, SE;
Kemira Kemi Aktiebolag, Helsingborg, SE;
Abstract
The present invention relates to a process for the preparation of polyaluminum hydroxychloride complexes having the general formula Al(OH).sub.x Cl.sub.y in solution or in solid form and intended to be used as flocculants and coagulants for water purification, sludge dewatering, plant dewatering and paper production, whereby one reacts aluminum chloride in solution with aluminum hydroxide, or aluminumoxide hydrates at a temperature of 120.degree.-170.degree. C. at an elevated pressure for 1.5-5 hrs, whereby the relationship AlCl.sub.3 :Al(OH).sub.3 is thus adjusted that the relationship OH:Al in the renewing compound Al(OH).sub.x Cl.sub.y becomes 0.5 to 1.5, preferably 0.8 to 1.2.