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Removal of water from oily liquids using extruded films containing absorbent polymers Disclosure Number: IPCOM000022337D
Publication Date: 2004-Mar-09
Document File: 2 page(s) / 30K

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Removal of water from oily liquids using extruded films containing absorbent polymers

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Removal of water from oily liquids using extruded films containing absorbent polymers

It is desirable to remove water and other hydrophilic or polar materials from a variety of oily or lipophilic materials. To remove water from an oil-containing tank, a weighted absorbent containing bag is hung in the tank to absorb water (US4758350A, US5672277A, WO93/22025). To remove water from oily materials (e.g. lubricating oils or fuels), a filter is inserted in the line during pumping of those liquids from one place to another. The filter may be expected to remove solid particulates as well as aqueous impurities (US4604205, US4623560). The filter may be made of a pleated paper or absorbent laminate that includes granular or fibrous super absorbent (US4787949, US4618388). Removal of water and other impurities from oil-filled electrical devices (e.g. capacitors (US4437082A)) improves electrical performance. There is also a desire to remove water and surfactants from dry cleaning fluid (US20030047511).

Through these applications, a variety of absorbent compositions is described for accomplishing the desired removal of water. The absorbent may comprise granular or fibrous absorbent polymers, including hydrophilic cellulose ethers, polyethylene oxide, polyacrylamide and a variety of other polymers, especially lightly crosslinked, partially neutralized polyacrylates (super absorbent polymer or SAP). Absorbent paper, cotton or cellulose fluff, desiccating resins, zeolites and other absorbent minerals have also been mentioned. Often the absorbent materials (granules, fibers, non-woven, absorbent paper and the like) are incorporated into a laminate or other structure that provides additional functionality, for example, removal of particulate, support for the absorbent, containment of the absorbent or the ability to coalesce minute water droplets. One advantage of using an absorbent material, whether it is fibrous, granular, film or laminate, is that the solidified aqueous liquid may be readily removed from the tank or the process. In the case of in-line filters, an increase in pressure drop across the filter as a result of swelling of the absorbent material has the beneficial effect of signaling when it is time to change the filter.

Thermoplastic structures that contain SAP can provide both absorbency and additional function...