Process for the recovery of sulphuric acid in the production of titanium dioxide
Номер патента: CA2006396A1
Опубликовано: 24-06-1990
Автор(ы): Eckhard Bayer, Gerhard Wiederhoft, Günter Lailach, Wolfgang Dieter Muller
Принадлежит: Bayer AG
Опубликовано: 24-06-1990
Автор(ы): Eckhard Bayer, Gerhard Wiederhoft, Günter Lailach, Wolfgang Dieter Muller
Принадлежит: Bayer AG
Реферат: Process for the recovery of sulphuric acid in the production of titanium dioxide ABSTRACT OF THE DISCLOSURE A process for the preparation of an improved quality TiO2 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 TiO2 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. Le A 26 608
Process for the production of high purity titanium dioxide.
Номер патента: FR2691143A1. Автор: Kischkewitz Jürgen,Butje Kai. Владелец: Bayer AG. Дата публикации: 1993-11-19.