Process for the recorvery of sulphuric acid in the production of

Details Process for the recorvery of sulphuric acid in the production of Process for the recorvery of sulphuric acid in the production of

1989-12-15

1991-01-29

Straub, Gary P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 82, 423 83, 423 85, 423610, 423615, 106436, C01G 2353

Patent

active

049884956

ABSTRACT:
A process for the preparation of an improved quality TiO.sub.2 pigment by hydrolysis of titanyl sulphate, isolation of the hydrolysis product form the waste acid produced during the hydrolysis, washing of the hydrolysis product and calcination of the hydrolysis product to form the TiO.sub.2 pigment, wherein the hydrolysis of the titanyl sulphate is carried out using separately produced hydrolysis nuclei which have been produced by a reaction of titanium salts with alkaline reagents, and in which waste acid and/or wash liquid containing waste acid is added after at least 50% of the total duration of the hydrolysis process.

REFERENCES:
patent: Re18790 (1933-04-01), Mecklenburg
patent: 1851487 (1932-03-01), Blumenfeld
patent: 2331496 (1943-10-01), Olson
patent: 2774650 (1956-12-01), Oppegaard
patent: 3368870 (1968-02-01), Soloducha
patent: 4288418 (1981-09-01), Davis et al.
patent: 4663131 (1987-05-01), Gerken et al.
Grant et al, Grant & Hackh's Chemical Dictionary 5th Ed., McGraw Hill Book Co., 1987, p. 573.

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