The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 1987
Filed:
May. 17, 1985
Koichi Yamada, Tokyo, JP;
Ichiro Hiraiwa, Kanagawa, JP;
Shin Taniguchi, Tokyo, JP;
Toshinari Zengo, Kanagawa, JP;
Ebara Corporation, Tokyo, JP;
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile