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公开(公告)号:US3512639A
公开(公告)日:1970-05-19
申请号:US3512639D
申请日:1967-10-18
Applicant: AMERICAN STANDARD INC
Inventor: KUGELMAN IRWIN JAY , HELLMANN JOSEPH B
CPC classification number: C02F1/283 , B01D11/0207 , B01D11/0223 , B01D15/02 , B01D24/16 , B01D24/30 , B01D24/386 , B01D24/40 , B01D24/42 , B01D24/44 , B01D24/48 , B01D2215/021 , B01J47/10
Abstract: 1,219,489. Liquid-solid contact; ion exchange; filtering. AMERICAN STANDARD Inc. 16 Oct., 1968 [18 Oct., 1967], No. 49159/ 68. Headings B1D, B1F and B1J. Liquid is pumped from inlet 18 upwards through a bed 12 of granular solids to outlet 22, whence it flows to conduit 30 through tank 28, and periodically the flow is suspended by switching off pump 16 and closing valves 38 and 24, then valve 36 is opened and pump 46 is started, which delivers treated liquid from tank 28, or alternatively water, to supply vessel 40 which contains fresh bed material, and once pressure in vessels 10, 40 has built up lower valve 20 is opened to discharge spent bed material. Before restoring normal conditions, valve 34 may be opened draining some liquid off, which compacts the bed round inlet 18. Discharge may be assisted by valve 20 opening into a chamber 64 under vacuum, as in Figure 2, not shown. The various operations are controlled by a timer T 2 , whose operation is initiated by a timer T 1 or by a pressure switch PS connected in inlet line 14. Vessels 10, 40 may be made of metal or plastics. The process may involve softening or filtering water by passage through a bed of ion exchange resins or sand, purifying sewage by filtration and absorption in a bed of granular coal, purifying sugar solution in a bed of active carbon, or extracting oil from soybeans using solvent.