Process for producing pure magnesium sulphite

Details Process for producing pure magnesium sulphite Process for producing pure magnesium sulphite

1986-06-26

1987-08-11

Castel, Benoit

Chemistry: physical processes

Physical processes

Crystallization

23307, 23296, 423159, 423512A, 423158, C01F 542, C01D 516

Patent

active

046859357

ABSTRACT:
A process for producing a pure magnesium sulphite from crude crystalline magnesium sulphite. Into a full suspension or flow containing magnesium sulphite crystals at least one further water-containing and heat-supplying flow is led. The heat-supplying flow rapidly increases the temperature of the suspension to above 80.degree. C. in less than 10 seconds, preferably in less than 2 seconds. The solid water-insoluble fraction is then separated from the resulting flow, and the pure product is recrystallized from the solution. The solution may be recycled into the process either for further purification or for use as at least one heat-supplying flow.

REFERENCES:
patent: 3630692 (1971-12-01), Green et al.
patent: 3812235 (1974-05-01), Robinson
patent: 4431615 (1984-02-01), Gabra
patent: 4474737 (1984-10-01), Najmr et al.
Mullin, J. W., "Crystallisation"; CRC Press; pp. 233-234; (1975).

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