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AssigneeNederlandse Centrale Organisatie voor Toegepast Natuurwetenschapplijk Onder Zoek
InventorsGerardus J. Arkenbout, Albert van Kuijk, Johannes van der Meer, Leonardus H. J. M. Schneiders
Estimating the term…
In a multistage countercurrent crystallization apparatus for multistage crystallization by adiabatic recrystallization and extractive washing comprising a vertical column containing a feed line, a waste material discharge, a purified product discharge, a crystallization zone or chamber at one end and a melter or dissolver at the other end, said vertical column containing a crystallizing liquid, a number of perforated plates subdividing said column into multistages, substantially spherical bodies contacting said perforated plates of a size larger than said perforations and designed to cooperate with the perforations of said perforated plates while in motion with respect to said perforated plates, means for vibrating said perforated plates whereby said substantially spherical bodies vehemently vibrate against said perforated plates, the improvement consisting essentially of reciprocating means to move said crystallizing liquid slowly and periodically with respect to said perforated plates in said column where said means for vibrating and said reciprocating means are coupled in such a manner that said means for vibrating operates only during the period said reciprocating means moves said crystallizing liquid through said column in the direction towards said melter or dissolver; as well as the method of crystallization employing said column.
In a multistage countercurrent crystallization apparatus for multistage crystallization by adiabatic recrystallization and extractive washing comprising a vertical column containing a feed line, a waste material discharge, a purified product discharge, a crystallization zone or chamber at one end and a melter or dissolver at the other end, said vertical column containing a crystallizing liquid, a number of perforated plates subdividing said column into multistages, substantially spherical bodies contacting said perforated plates of a size larger than said perforations and designed to cooperate with the perforations of said perforated plates while in motion with respect to said perforated plates, means for vibrating said perforated plates whereby said substantially spherical bodies vehemently vibrate against said perforated plates, the improvement consisting essentially of reciprocating means to move said crystallizing liquid slowly and periodically with respect to said perforated plates in said column where said means for vibrating and said reciprocating means are coupled in such a manner that said means for vibrating operates only during the period said reciprocating means moves said crystallizing liquid through said column in the direction towards said melter or dissolver.
In the process for continuous countercurrent liquid-solids contact for multistage crystallization by adiabatic recrystallization and extractive washing comprising the steps of passing a liquid in essentially one direction through a vertically-aligned confined space in contact with crystals being passed in the other direction, said liquid being a solvent for at least part of said crystals, said confined space being substantially horizontally restricted in a plurality of places, said horizontal restrictions being a plurality of perforated plates positioned at spaced intervals in said vertically aligned confined space-forming compartments, said restrictions being such that the said crystalline solids to be treated in countercurrent with said liquid substantially pass through said perforated plates, providing a drumming action against said perforated plates by means of movable substantially spherical objects being substantially vertically vibrated against said perforated plates at a frequency of between 100 and 10,000 vibrations per minute with amplitudes of between 0.1 and 5 millimeters, whereby the passage of said crystalline solids through the perforations of said perforated plates is substantially promoted, said substantially vertical vibrations of said movable objects being effected by motion of said perforated plates in a vertical oscillation at such a rate that said movable objects are subjected to accelerating forces of about 2 to 5 times the gravitational forces, the improvement consisting of moving said liquid slowly and periodically with respect to said perforated plates, where said liquid movement and said drumming action are coordinated whereby said drumming action occurs only when said liquid is moving through said perforated plates in the direction said crystalline solid is being passed.
Dependencies are inferred from the claim text.