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Improvements in or relating to the Manufacture of Membranes
Improvements in or relating to the Manufacture of Membranes
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机译:膜制造方面或与之有关的改进
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1,174,137. Membrane for desalination. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. 19 Nov., 1968 [24 Nov., 1967], No. 53565/67. Heading B1X. [Also in Division B5] A cast semi-permeable membrane which may be used for osmotic exchange, reverse osmosis, dialysic and electro-dialysic has a plurality of grooves or ridges upon its rear surface. The grooves define channels for the liquid flow to or from the rear surface of the membrane and the membrane is held on a non-porous backing plate by a positive differential liquid pressure applied to its front surface. In an example a membrane for use in reverse osmosis is prepared by casting a mix of cellulose acetate, formamide and acetone on a grooved plate, immersing in ice water, stripping the membrane from the plate and curing it in water at 75‹C. The membrane is folded upon itself with its rear faces in contact to form a pocket which is sealed at two edges, the grooves being straight and parallel and at an angle of 45‹ to the fold line. The cast membrane is provided with a thin active layer on its front surface. A salt solution is applied under pressure to the front surface, and fresh water escapes from the open edge remote from the fold.
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