Method for the production of alpha-calcium sulfate...

Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing

Reexamination Certificate

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C106S772000

Reexamination Certificate

active

07951352

ABSTRACT:
Disclosed is a method for producing alpha-calcium sulfate hemihydrate from calcium dihydrate. Said method has the following features: a) calcium dihydrate is fed to an agitated autoclave (1); b) the agitated autoclave (1) is indirectly heated; c) water is added and incorporated in a controlled manner; d) the feedstock is prevented from adhering to surfaces of the reaction chamber by means of moved chains (3) that are mounted on the paddles and/or the drive shaft (16) of the agitated autoclave (1); e) the pressure in the reaction chamber is regulated at intervals or in a continuous manner by discharging vapor when a certain pressure has been reached in the interior, the vapor being conducted via a centrifugal separator (17) and a control valve (18); f) cold air is delivered for residual drying purposes; g) the process material is removed. Also disclosed is a corresponding apparatus for carrying out said method.

REFERENCES:
patent: 1979704 (1934-11-01), Randel et al.
patent: 5041333 (1991-08-01), Conroy
patent: 5320677 (1994-06-01), Baig
patent: 344478 (1921-11-01), None
patent: 937276 (1955-12-01), None
patent: 952967 (1956-11-01), None
patent: 0572781 (1996-09-01), None
patent: 1 224 149 (1971-03-01), None
patent: 1224149 (1971-03-01), None

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