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Reduced fouling of reverse osmosis membranes

一种反渗透膜、纳米滤膜的技术，应用在水污染物、渗透/透析水/污水处理、水/污水处理等方向，能够解决效果差等问题

Active Publication Date: 2010-02-10
PUROLITE (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also a major cost issue in the 2002 / 0153319 application was poor performance when using water sources with a hardness to alkalinity ratio much less than 1

Method used

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  • Reduced fouling of reverse osmosis membranes
  • Reduced fouling of reverse osmosis membranes
  • Reduced fouling of reverse osmosis membranes

Examples

Experimental program
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preparation example Construction

[0149] Preparation of macroporous resin

[0150] Traditional gel resins produced by copolymerization of monovinylidene or polyvinylidene monomers contain micropores, and the pore structure is interpreted as the distance between cross-linked cross-linked polymer chains. In addition to the gel pores of ordinary porous gel resins, the polymer lattice of the macroporous resin also contains obvious non-gel pores. These microscopic channels are distinct and distinct from the micropores contained in all crosslinked copolymers. While those pores are relatively small, they are much larger compared to those of gel-type resins.

[0151] The macroporous resins mentioned above can be prepared using the method of U.S. Pat. 6,323,249, incorporated herein by reference. Macroporous resins produced according to the method described in U.S. Pat. 6,323,249 have very large sized pores with a narrow pore size distribution giving them sufficient crush strength. A narrow pore size distribution sui...

example

[0170] The examples below are good examples of what has been demonstrated in this invention. The inventors' techniques, contained in the examples, have worked well in practice and constitute good models in those practices. However, those of ordinary skill in the field to which the present invention pertains can make some specific modifications in specific examples based on the information disclosed herein, without departing from the spirit and scope of the present invention. changed and still get similar results.

example 1

[0172] The invention uses continuously flowing, naturally occurring surface water containing colloidal silica, organic matter, turbidity, and Silt Density Index (SDI) values ​​obtained from a river as the water source. The pretreatment system for the river water includes softening and clarification with chlorine, aluminum sulfate and calcium hydroxide, followed by filtration with sand and activated carbon. Prior to use, the water passes through a lifetime wound cotton filter to remove suspended solids. The filtered water was alternately passed through two one liter vessels, each containing one liter of resin components, at a flow rate of 12 bed volumes per hour. The components consisted of a 50:50 mixture of two resins manufactured by Purolite. One is the macroporous anion resin Purolite A501P with high porosity and high crushing strength described in U.S. Patent No. 6,323,246 by Dale et al.; the other is macroporous acrylic strong basic anion resin A-860. During the test, t...

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Abstract

The present invention provides a new water purification method and system using reverse osmosis. In particular, the present invention provides methods and water purification systems using an ion exchange resin and absorbent media for pretreatment of water being fed to a reverse osmosis treatment system, where the pretreatment reduces fouling of, or deposits or chemical attack on the membrane surfaces and passageways. Particularly, a macroporous resin having an average pore diameter in the range of 1,000 to 500,000 Angstroms and a crush strength or Chatillon value of at least 24 g / bead (710[mu]m bead diameter) is used.

Description

[0001] Cross-Referenced Related Applications [0002] Priority documents for this invention are U.S. Provisional Application No. 60 / 885,885, filed January 19, 2007; and U.S. Provisional Application No. 60 / 908,172, filed March 26, 2007. All of them are fully included in the present invention. technical field [0003] The present invention relates to the process of purifying water using reverse osmosis membranes and nanofiltration membranes. Especially in reverse osmosis or nanofiltration membrane water treatment systems, ion exchange resins are used to pretreat water to reduce contamination of membrane surfaces and channels. Background technique [0004] Reverse osmosis (RO) and nanofiltration (NF) systems are used in the desalination and softening of water in the energy, chemical, semiconductor, and pharmaceutical industries. This type of process is also used in the desalination of salt water or sea water to produce drinking water, which has played a large role in coping w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/00C02F1/42C02F1/44C02F101/10
CPCC02F2001/422C02F2101/10C02F9/00C02F2303/185C02F2001/425C02F1/42C02F2303/16C02F1/441C02F1/001C02F1/76C02F1/70
Inventor 弗朗西斯·博尔多法比奥·查维斯·德苏萨詹姆斯·A·戴尔卡门·米哈伊拉·伊森
Owner PUROLITE (CHINA) CO LTD
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