Water purification by reverse osmosis

Details Water purification by reverse osmosis Water purification by reverse osmosis

1977-02-24

1978-11-07

Spear, Jr., Frank A.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Plural elements controlled

210136, 210137, 210138, 210321R, 210416M, 210433M, 417465, B01D 1300, C02B 182

Patent

active

041244885

ABSTRACT:
Apparatus for reverse osmosis purification of water or other fluid by passing the fluid under pressure across a membrane, through which membrane a part of the fluid passes in purified form, makes use of a piston or diaphragm pump in which the front face of the piston or diaphragm is used to force the fluid from one end of a cylinder into the module and in which the return fluid is applied to the rear face of the piston or diaphragm so that the pressures on the two faces are substantially balanced. The piston or diaphragm is operated by a piston rod attached to the rear face of the piston or diaphragm; the system is self-regulating to give an extraction ratio equal to the ratio of piston rod area to piston area.

REFERENCES:
patent: 1909145 (1933-05-01), Berenbruch
patent: 2982309 (1961-05-01), Read
patent: 3168872 (1965-02-01), Pinkerton
patent: 3246604 (1966-04-01), Brailsford
patent: 3489159 (1970-01-01), Cheng et al.
patent: 3493495 (1970-02-01), Mendelson
patent: 3498910 (1970-03-01), Mendelson
patent: 3598238 (1971-08-01), Collins
patent: 3825122 (1974-07-01), Taylor
patent: 4008003 (1977-02-01), Pinkerton
patent: 4037616 (1977-07-01), Pinkerton
patent: 4054522 (1977-10-01), Pinkerton
"Development of Flow Work Exchangers for Energy Recovery in Reverse Osmosis Plants" Gilbert et al., Dept. of Interior, Off. of Saline Water, Report 680.
"Flow Work Exchanger" Cheng et al., Aiche Journal, May, 1967, pp. 438-442.
"Flow Work Exchanger For Desalinization Processes" from the Office of Saline Water, Report 357, 1968.

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