Process for the preparation of polyaluminum compounds

Details Process for the preparation of polyaluminum compounds Process for the preparation of polyaluminum compounds

1990-02-13

1993-01-26

Niebling, John

Chemistry of inorganic compounds

Halogen or compound thereof

C01F 756

Patent

active

051820943

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.

REFERENCES:
patent: 3909439 (1975-09-01), Rivola et al.
patent: 3953584 (1976-04-01), Danner et al.
patent: 4082685 (1978-04-01), Notari et al.
patent: 4390445 (1983-06-01), Gytel
patent: 4859446 (1989-08-01), Abrutyn et al.
Perry and Chilton "Chemical Engineers Handbook" 5th edition, p. 4-3.

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