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Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof

A nanofiltration membrane and cleaning agent technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as damage to membrane elements, achieve reduced cleaning frequency, fast and efficient permeation flux, and restore permeation flux. volume effect

Inactive Publication Date: 2016-03-23
新疆水处理工程技术研究中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the pollution develops gradually, if not controlled early, the pollution will damage the membrane elements in a relatively short period of time

Method used

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  • Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof
  • Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof
  • Cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] By weight percentage, 2% citric acid and 98% water are successively added in an enamel reactor with a stirring function, stirred at room temperature for 1-3 hours, and the pH value is adjusted with volumetric concentration of 20% ammonia water to make it It is 3, promptly get the medium fiber nanofiltration membrane cleaning agent that is suitable for cleaning calcium carbonate scale pollution.

Embodiment 2

[0037] According to the percentage by weight, 3% sodium tripolyphosphate, 1% trisodium phosphate, 10% sodium carbonate, 1% disodium edetate, and 85% water are added to an enamel reactor with stirring function , stir at room temperature for 1-3 hours, and use sodium carbonate with a pH value of 10 to obtain a medium-fiber nanofiltration membrane cleaning agent suitable for cleaning calcium sulfate scale, strontium sulfate scale, and barium sulfate scale pollution.

Embodiment 3

[0039] By weight percentage, 40% hydrochloric acid (content 31%), 2% disodium ethylenediamine tetraacetate, 58% water are successively added in an enamel reactor with a stirring function, and stirred at room temperature for 1-3 hours , adjust the pH value to 2.5 with sodium hydroxide to obtain a medium fiber nanofiltration membrane cleaning agent suitable for cleaning calcium carbonate scale, calcium sulfate scale, strontium sulfate scale, and barium sulfate scale pollution.

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Abstract

The invention discloses a cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and a preparation method thereof. The cleaning agent is prepared from, by mass, 0-4% of citric acid, 0-60% of hydrochloric acid, 0-0.5% of oxalic acid, 0-4% of sodium tripolyphosphate, 0-20% of sodium carbonate, 0-0.3% of sodium hydroxide, 0-2% of trisodium phosphate, 0-4% of sodium sulfate, 0-5% of sodium hydrogen sulfite, 0-10% of ethylenediaminetetraacetic acid, 0-0.1% of alkyl sodium sulfonate, 0-0.3% of sodium dodecyl benzene sulfonate, 0-0.3% of sodium dodecyl sulfate and the balance water, wherein the mass percentage of water is not larger than 98%. All the components are sequentially added in proportion to a stirring enamel reactor and stirred and mixed to be uniform at room temperature. The cleaning agent is easy to prepare, high in decontamination pertinence, efficient, low in cleaning cost and especially suitable for cleaning away calcium carbonate scale, calcium sulfate scale, strontium sulfate scale, barium sulfate scale, metal oxide and metal hydroxide of the hollow fiber nanofiltration membranes and cleaning colloid contaminated and biologically contaminated nanofiltration membranes.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane cleaning, in particular to a cleaning agent suitable for cleaning hollow fiber nanofiltration membranes and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a new type of pressure-driven membrane separation technology developed on the basis of reverse osmosis membrane. Typical nanofiltration membranes have the following characteristics: (1) have excellent hardness removal ability (Ca 2+ , Mg 2+ ), or the ability to remove highly polluting heavy metal ions while retaining more beneficial monovalent ions (Na + 、K + etc.), and at the same time have the effect of pore charge repulsion; (2) The range of membrane pore size is between 1-5nm, which is between reverse osmosis membrane (0.1nm-1nm) and nanofiltration membrane (>5nm), and the molecular weight cut-off is between Between 200-2000 Daltons, the cut-off range of soluble organic substance...

Claims

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Application Information

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IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/168
Inventor 张清华曾凡付王刚许白羽
Owner 新疆水处理工程技术研究中心有限公司
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