Alaquainc offer the frequently process on the heating pipe
of heat exchanger crystallizing. Crystallization are a motion process in which
the cool from pan dropping temperature. Differ from one another in the method
by this case Super saturation in the swirling liquid near the surface and Produced
by evaporation of the solvent. Which result in deposit on swirling suspended crystals?
Super saturation is generating by evaporation.
Cooling crystallization from solution or the Evaporative
The processes is Alternative
methods of cooling that not require a heat exchanger are flash cooling which
involves crystallizer evaporation of the
solvent or direct cooling via insertion of a cold gas or with increasing
stability of temperature. Crystallization
of the liquid is cooled to a temperature below the equilibrium solubility.
In a cooling crystallization process the feed
is cooled in a heat exchanger, but the heat exchanger can also be integrated in
the crystallizer in the form of cooled tubes or plates. From the cooling needs
to be done carefully to prevent nucleation on the cold surface of the heat
exchanger, which will lead to encrustation. The lowest temperature in the
system is at the surface of the heat exchanger.
Basically measures to prevent
this unwanted phenomenon is to reduce the temperature difference between the
coolant and the Crystallizers cooling solution, to increase the liquid velocity
along the surface of the heat level out
the temperature difference over the length of the heat exchanger or to use a
scraper to keep the surface of the heat exchanger free of solids.
In which implement that cooling
the saturated solution will not result in a significant amount of crystals
mention that evaporative crystallization is usually the preferred method when
the amount of dissolved product decreases with less energy level. In the case
of compounds with a low solubility the standard option is reactive
crystallization/precipitation.
Evaporative Crystallization
The evaporation heat that has
been added is in principle captured in the vapor stream. The Crystallizers evaporative
are used industry to achieve solid-liquid separation. The
crystallization evaporation of the solvent is resulting from the certain moment
the concentration of impurities will become so high that they can influence the
crystallization and/or the product purity. So that is process creates a vapor
and a suspension of crystals in mother liquor. In this principle of energy can
be recovered, but the energy will be available on a lower. This is possible to residual
amount of product by recycling the mother liquor to the feed. If that is the
case, mother liquor will still contain the equilibrium concentration of product.
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