Niro Process Technology B.v.

Halbe Anne Jansen

Jacobus Petrus Roodenrijs

Johannes Josephus Andreas Gerardus Jansen

An installation for crystallizing a liquid from a solution, for example for freeze-concentrating effluent, having a nucleation zone, a ripening zone and a separator where the nucleation zone is constructed as a vacuum crystalline, such that the installation is of relatively simple and inexpensive construction, can easily be scaled up and is suitable for concentrating liquids containing undissolved particles, such as, for example, precipitated salts.

Method and apparatus for crystallization from liquids

The present invention relates to a method and installation for the crystallisation of a liquid from a solution, a suspension or a mixture of liquids using a crystalliser,which, for example, is provided on its wall with a heat exchanger,and comprises a single chamber for both nucleation and growth. Depleted mother liquor is withdrawn from the crysiallisation vessel via a filter,located in the crystalliser, so that the crystal content in the vessel can be accurately adjusted for the purpose of optimum separation of the crystals, preferably using a packed-bed wash column. The crystalliser preferably contains a stirrer with the filter on the stirrer,shaft. The filter rotates past a scraper,, which is arranged in a fixed position, as a result of which the filter cake can be reintroduced into the suspension without damage to the crystals.

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Maren Kessel, Netherlands

Halbe Anne Jansen