METHOD FOR REDUCING MONOVALENT IONS IN CONCENTRATE OF NANOFILTRATION SYSTEM AND THE NANOFILTRATION SYSTEM

Number of patents in Portfolio can not be more than 2000

United States of America

APP PUB NO 20200023317A1
SERIAL NO

16498201

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Abstract

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This specification describes a method for lowering the content of monovalent ions in a final concentrate of a nanofiltration system relative to a brine and a corresponding nanofiltration system. The nanofiltration system comprises at least three stages of nanofiltration, wherein the concentrate from each segment flows into the next segment. A feed stream is sent into one stage to generate a concentrate stream, and a first portion of the concentrate stream is recirculated to the one stage. The pH of the feed stream is controlled in a range of 2-7. The temperature of the feed stream is in a range of 20-60° C. The feed stream includes the recirculated concentrate stream and at least part of a concentrate generated from an upstream stage. The method and the system described herein can reduce the concentration of monovalent ions in the final concentrate during a nanofiltration separation process.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
LUO, Min Beijing, CN 40 253
ZHAI, Jianwen Beijing, CN 4 0

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