Process for separating off calcium nitrate tetrahydrate by cryst

Details Process for separating off calcium nitrate tetrahydrate by cryst Process for separating off calcium nitrate tetrahydrate by cryst

1984-02-23

1986-02-11

Bernstein, Hiram H.

Chemistry: physical processes

Physical processes

Crystallization

23304, B01D 902

Patent

active

045696772

ABSTRACT:
Separating Ca(NO.sub.3).sub.2.4H.sub.2 O from a nitrophosphate digestion liquor by crystallization, wherein Ca(NO.sub.3).sub.2.4H.sub.2 O seeding material with a particle size smaller than 100 .mu.m is added to this liquor at a temperature of 0.degree.,1.degree.-2.degree. C. lower than the saturation temperature, the resulting liquor is batchwise cooled, and the Ca(NO.sub.3).sub.2.4H.sub.2 O crystallized out is separated from the cooled liquor.
The Ca(NO.sub.3 ).sub.2.4H.sub.2 O is substantially crystallized out without excessive cooling as very coarse and uniform particles which can be easily separated out.

REFERENCES:
patent: 1976283 (1934-10-01), Johnson et al.
patent: 2573516 (1951-10-01), vom der Molen
patent: 2813777 (1957-11-01), Swensen
patent: 4008309 (1977-02-01), Moldovan et al.
92 Chem. Abst. No. 23, p. 584, No. 197171k (Jun. 1980).

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