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Nanofiltration membrane repairing agent for brine refining and preparation method thereof

A technology for repairing pharmaceuticals and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of increased flux of calcium and magnesium rejection, decrease of calcium and magnesium rejection, and increased flux. Achieve the effects of improving calcium and magnesium retention rate, strong anti-redeposition ability and prolonging service life

Active Publication Date: 2021-03-16
青岛沁安化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the retention rate of calcium and magnesium is greatly reduced and the flux is increased after the nanofiltration membrane is polluted and cleaned in a high-salt complex brine system, and provides an on-line repair agent for the shutdown of the brine refined nanofiltration membrane at room temperature. The invention of the repair agent is also suitable for the repair of concentrated seawater or brine with high calcium and magnesium ions, the calcium and magnesium rejection rate of the nanofiltration membrane is greatly reduced, and the flux is increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Nanofiltration membrane repair agents for brine purification, including:

[0060] (1) Nanofiltration Membrane Activation Restoration Agent A, including:

[0061] Nanofiltration membrane activation components: 5 parts of isothiazolinone, 0.2 part of ethylene glycol, 50 parts of dodecyl dimethyl benzyl ammonium chloride;

[0062] Nanofiltration membrane repair components: 0.5 parts of ethylenediaminetetraacetic acid, 0.2 parts of hydroxyethylene diphosphonic acid, 1 part of trimesoyl chloride, and 0.5 parts of piperazine;

[0063] Acid regulator: 1 part of citric acid;

[0064] Water: 100 parts;

[0065] (2) Nanofiltration membrane curing maintenance agent B, including:

[0066] Nanofiltration membrane curing and maintenance components: 1 part of zwitterionic polyacrylamide (molecular weight ≤ 1 million), 1 part of piperazine;

[0067] Alkaline conditioner: 5 parts of sodium bicarbonate;

[0068] Water: 100 parts;

[0069] Prepare as follows:

[0070] Step (1) a. A...

Embodiment 2

[0081] Nanofiltration membrane repair agents for brine purification, including:

[0082] (1) Nanofiltration Membrane Activation Restoration Agent A, including:

[0083] Nanofiltration membrane activation components: 8 parts of isothiazolinone, 1 part of ethylene glycol, 55 parts of dodecyl dimethyl benzyl ammonium chloride;

[0084] Nanofiltration membrane repair components: 2 parts of ethylenediaminetetraacetic acid, 1 part of hydroxyethylene diphosphonic acid, 4 parts of trimesoyl chloride, 1 part of piperazine, and 2 parts of polymerized phenylenediamine;

[0085] Acid regulator: 3 parts of citric acid;

[0086] Water: 100 parts of water;

[0087] (2) Nanofiltration membrane curing maintenance agent B, including:

[0088] Nanofiltration membrane curing and maintenance components: 4 parts of zwitterionic polyacrylamide (molecular weight ≤ 1 million), 5 parts of piperazine, and 1 part of polymerized phenylenediamine;

[0089] Alkaline conditioner: 10 parts of sodium bicar...

Embodiment 3

[0098]Nanofiltration membrane repair agents for brine purification, including:

[0099] (1) Nanofiltration Membrane Activation Restoration Agent A, including:

[0100] Nanofiltration membrane activation components: 6 parts of isothiazolinone, 0.4 parts of ethylene glycol, 55 parts of dodecyl dimethyl benzyl ammonium chloride;

[0101] Nanofiltration membrane repair components: 1 part of ethylenediaminetetraacetic acid, 0.4 parts of hydroxyethylene diphosphonic acid, 3 parts of trimesoyl chloride, 1 part of piperazine, and 3 parts of polymerized phenylenediamine;

[0102] Acid regulator: 1.5 parts of citric acid;

[0103] Water: 100 parts;

[0104] (2) Nanofiltration membrane curing maintenance agent B, including:

[0105] Nanofiltration membrane curing and maintenance components: 1 part of zwitterionic polyacrylamide (molecular weight ≤ 1 million), 3 parts of piperazine, and 2 parts of polymerized phenylenediamine;

[0106] Alkaline conditioner: 6 parts of sodium bicarbona...

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Abstract

The invention discloses a nanofiltration membrane repairing agent for brine refining, and a preparation method thereof. The nanofiltration membrane repairing agent comprises: a nanofiltration membraneactivation repairing agent comprising 50-70 parts of a nanofiltration membrane activation component, 2-10 parts of a nanofiltration membrane repairing component, 1-3 parts of an acidity regulator, and 80-200 parts of water; and a nanofiltration membrane curing maintenance agent comprising 2-10 parts of a nanofiltration membrane curing maintenance component, 5-10 parts of an alkaline regulator and80-200 parts of water. The preparation method comprises the following steps: adding the nanofiltration membrane activation component into water, heating to 80-85 DEG C, and stirring for 2-3 hours; adjusting the pH value to be 2-4; under normal pressure and at the temperature of 105-110 DEG C, adding the nanofiltration membrane repairing component, and stirring for 2-3 hours; adjusting the pH value to be 2-4; and adding water into the nanofiltration membrane curing maintenance component, stirring for 2-4 hours, and regulating the pH value to 7-9. The nanofiltration membrane repairing agent ismainly used for repairing the nanofiltration membrane of which the calcium and magnesium rejection rate is reduced during brine refining in a high-salt complex brine system, the calcium and magnesiumrejection rate of the nanofiltration membrane can be effectively increased, the repairing effect is good, the repairing agent is saved, and the repaired nanofiltration membrane can operate for a longtime under the working condition that the calcium and magnesium rejection rate is greatly increased.

Description

technical field [0001] The invention relates to the field of performance restoration of nanofiltration membranes, in particular to a nanofiltration membrane restoration agent in brine, concentrated seawater or a saltwater system containing relatively high calcium and magnesium ions. [0002] technical background [0003] In industrial production, in order to obtain relatively pure industrial brine, it is necessary to use a nanofiltration membrane filtration device to desalinize brine with calcium and magnesium ions. The nanofiltration membrane filtration device used in this process will naturally age with the increase in processing capacity and the extension of use time. In addition, regular acid-base chemical cleaning will also cause the performance of the membrane filtration device to gradually decay, and the oxidation in the water Substances can also cause continuous attenuation in the performance of membrane filtration devices. When the core index "salt rejection rate" o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10B01D65/02
CPCB01D65/022B01D65/108B01D2321/16B01D2321/162
Inventor 王凯邵骏陶赵光年
Owner 青岛沁安化工科技有限公司