Liquid purification or separation – Flow – fluid pressure or material level – responsive – Diverse sensing means
Patent
1985-05-17
1987-07-14
Hruskoci, Peter
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Diverse sensing means
210137, 210143, 2104161, 2104332, B01D 1300
Patent
active
046801090
ABSTRACT:
This invention relates to a membrane separator which separates matters with a semipermeable membrane to obtain a dilute solution or a concentrated solution or both. In such a membrane separator, the most economical operation is attained by the condition in which the maximum amount of the desired solution is obtained by the minimum energy, that is, the required energy per unit amount of the solution obtained. Heretofore, the minimum power has been sought at the maximum pressure corresponding to the performance of the semipermeable membrane with the result that the required energy could not be minimized.
This invention provides a membrane separator having a flow rate controlling apparatus provided with a control circuit which uses a pump performance curve, a power recovering means performance curve, and the relationship between the concentration of the solute in a solution and the osmotic pressure of the solution to calculate the minimum required power at a predetermined dilute solution flow rate or concentrated solution flow rate. This invention is characterized in that the power recovering means performance curve is also taken into account. An embodiment of the invention comprises a means for detecting the flow rate of a feed solution, concentrated solution or dilute solution for the membrane separator and a control circuit for regulating a pressure regulating valve or the power recovering means in such a manner that the value indicated by the flow rate detecting means coincides with the theoretical flow rate in the system.
REFERENCES:
patent: 3365061 (1968-01-01), Bray
patent: 3405058 (1968-10-01), Miller
patent: 3756408 (1973-09-01), Spatz et al.
patent: 4113614 (1978-09-01), Rollo et al.
patent: 4267040 (1981-05-01), Schal
patent: 4321137 (1982-03-01), Kohler
patent: 4354939 (1982-10-01), Pohl
Hiraiwa Ichiro
Taniguchi Shin
Yamada Koichi
Zengo Toshinari
Ebara Corporation
Hruskoci Peter
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