Method of preventing formation of bubbles during filtration operations
AssigneesHitachi Chemical Research Center, Inc., Hitachi Chemical Company, Ltd.
InventorMieko Ogura
Life of this patent
Estimating the term…
Abstract
Formation of bubbles is prevented during filtration operation by placing an oil on top of a solution-to-be filtered, where the oil is not admixable with the solution and has a lower specific gravity than the solution. The oil seals the solution from air so that no bubbles are formed. The oil does not pass through the filter even after all collectable filtrate of the solution has passed therethrough.
Claims18
A method of filtration comprising:
- loading a solution-to-be filtrated upstream of a membrane filter, said solution containing components forming bubbles during filtration operation;
- covering the solution with a layer of an oil composition, said composition consisting essentially of at least one oil, to prevent formation of bubbles from the solution, said at least one oil being non-admixable with the solution and having a lower specific gravity than the solution;
- filtrating the solution through the membrane filter wherein the oil stays on the membrane filter;
- and
- recovering a filtrate.
A method of preventing formation of bubbles in filtration operation using a membrane, comprising placing a layer of an oil composition, said composition consisting essentially of at least one oil, on top of a solution-to-be filtered, said at least one oil having a lower specific gravity than the solution and being non-admixable with the solution, wherein the oil does not pass through the membrane under a designated filtration pressure as long as the membrane is wetted with the solution.
A method of filtering a solution with reduced bubble formation relative to filtering the solution alone, comprising placing a layer of an oil composition that consists essentially of at least one oil on top of a solution-to-be filtered, said at least one oil having a lower specific gravity than the solution and being non-admixable with the solution;
- filtering the solution through a membrane for at least 30 seconds under a designated filtration pressure, wherein the oil composition does not completely penetrate the membrane.
Dependencies are inferred from the claim text.