***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***Concentration of solution by reverse osmosis

摘要: Provided is a multistage method and apparatus for concentrating solution by reverse osmosis, comprising the steps means for: maximizing concentration of absolute in having only standard capacity pumps, including providing first to concentration, said least one unit which positioned upstream with respect direction be concentrated flows, second that has been higher than at downstream direction; units consisting essentially respective membrane modules module tight osmosis high rejection percentage sufficient achieve flux density solvent flowing through membrane, loose lower easily further membrane.