Process and apparatus for recovering a pure substance from a liq

Chemistry: physical processes – Physical processes – Crystallization

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23296, 585805, 585801, 585815, B01D 900, C07C 700, C07C 714

Patent

active

050628623

ABSTRACT:
The invention relates to a crystallization process for recovering a pure substance from a liquid mixture, a starting mixture being cooled down in a crystallization zone to form a crystal suspension from which crystals of the pure substance are recovered, wherein a) the crystal suspension is subjected to a crude preliminary separation in a (preliminary) separation zone to form a first mother liquor and a crystal mass containing relatively small particles, b) the crystal mass formed in a) is allowed to develop in a development zone at a temperature which is higher than that of the crystallization zone and lower than the melting point of the substance to be recovered, and is separated into a developed crystal mass and a second mother liquor, and c) the developed crystal mass formed in b) is separated into a third mother liquor and the intended pure substance in a separation zone, as well as to an apparatus suitable for performing said process.

REFERENCES:
patent: 2750433 (1956-06-01), Tourneau et al.
patent: 2848515 (1958-08-01), Pfennig
patent: 2848517 (1958-08-01), Huff et al.
patent: 2848519 (1958-08-01), Corneil et al.
patent: 2890239 (1959-06-01), Quigg

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