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Scale inhibitor for reverse osmosis membrane and preparation thereof

A technology of reverse osmosis membrane and scale inhibitor, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Efficiency has not yet reached the scale inhibition efficiency and other issues, to achieve the effect of a wide range of applications, improved scale inhibition performance, and reduced cleaning frequency

Active Publication Date: 2009-08-05
北京弘扬紫东环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and application of domestic reverse osmosis antiscalants has been going on, far from reaching the ideal level. At present, there are different types of reverse osmosis antiscalants in the market, and the scale inhibition performance of the products is not high. Scale inhibition efficiency (90%) level of scale agent

Method used

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  • Scale inhibitor for reverse osmosis membrane and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Antiscalant formula:

[0023] Hydroxyethylidene Diphosphonic Acid (HEDP) 3%

[0024] 2-Phosphono-1,2,4-tricarboxylic butane (PBTCA) 7%

[0025] Acrylic acid / methyl acrylate copolymer 20%

[0026] Polymaleic acid 1%

[0027] Water 69%

[0028] Static evaluation of reverse osmosis antiscalant test water quality:

[0029] Ca2 + 100mg / L HCO 3 - 100mg / L pH value 8.6

[0030] Scale inhibition test temperature: 80℃±1℃

[0031] Standing time: 10 hours

[0032] Drug dosage: 5mg / L

[0033] Calcium carbonate scale inhibition rate: 95.2%

example 2

[0035] Antiscalant formula:

[0036] Amino Trimethylene Phosphonic Acid (ATMP) 2.5%

[0037] 2-Phosphono-1,2,4-tricarboxylic butane (PBTCA) 6.5%

[0038] Acrylic acid / hydroxypropyl acrylate copolymer 21%

[0039] Polymaleic acid 1%

[0040] Water 69%

[0041] The antiscalant of the present invention forms a clear solution after being compounded with flocculants, reducing agents, bactericides, etc. added by the reverse osmosis system, and does not become turbid for a long time. The antiscalant was subjected to the static compound antiscaling test, and compared with the antiscaling test of this antiscalant when used in a single agent, the results are shown in the following table:

[0042]

[0043] The data in the table shows that the scale inhibitors in Example 2 have basically similar scale inhibition rates in the presence of flocculants, reducing agents and bactericides, and the scale inhibitors of the present invention have sufficient compatibility and high anti-interf...

example 3

[0045] Antiscalant formula is the same as Example 1

[0046] It is operated on a reverse osmosis equipment with a water treatment capacity of 100 tons / hour in a certain company, and the dosing concentration is 5mg / L.

[0047] Influent water quality:

[0048] Na + 395mg / L HCO 3 - 340mg / L

[0049] Ca 2+ 7.00mg / L Cl - 80.0mg / L

[0050] Mg 2+ 13.5mg / L SO 4 2- 86.50mg / L

[0051] Fe 3+ 0.30mg / L CO 3 2+ 20mg / L

[0052] AL 3+ 0.15mg / L SDI <3

[0053] SiO 2 2- 20.0mg / LCOD Mn 1.5mg / L

[0054] Total Hardness 25mg / L PH 8.70

[0055] After 10 months of operation, the pressure difference in the second stage of the reverse osmosis membrane dropped from 0.14 MPa to 0.09 MPa, the desalination rate remained above 98.5%, and the purified water output decreased by 8.5%. The cleaning cycle was extended from 2.5 to 3 months to 10 moon.

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Abstract

The invention relates to a reverse osmosis water treatment agent, in particular to a scale inhibitor for reverse osmosis membrane. A formulation comprises organic poly-phosphate compound, phosphine carboxylic acid, crylic acid biopolymer, polymaleic acid compound and water; the compositions have the following weight mixture ratio: 1.0 to 6.0 percent of the organic poly-phosphate compound, 2 to 12 percent of the phosphine carboxylic acid, 10 to 40 percent of the crylic acid biopolymer, 0.2 to 2 percent of the polymaleic acid compound and the balance being water. The scale inhibitor for the reverse osmosis membrane utilizes synergism of each composition, improves the lower-limit scale inhibition performance of the scale inhibitor on reverse osmosis concentrated water (highly mineralized water), effectively controls large-scale formation on the reverse osmosis membrane of calcium, strontium, barium, magnesium, iron, copper, zinc and other salts, reduces the cleaning frequency of a reverse osmosis system and maintains normal water drainage and water supply pressure.

Description

technical field [0001] The invention relates to reverse osmosis membrane water treatment technology, in particular to a water treatment scale inhibitor for reverse osmosis membranes. Background technique [0002] Reverse osmosis technology is a membrane separation technology that has been widely used in the water treatment industry. A large amount of impurities in water can be removed through membrane separation. Such as inorganic substances, metal ions, organic substances, colloids, even bacteria and viruses, etc., is a new technology of high efficiency, low consumption and pollution-free water treatment. In recent years, reverse osmosis membrane technology has been widely used in the production of ultrapure water, desalination, sewage treatment and separation and purification of various products in the chemical, pharmaceutical, food, electronics and other industries. [0003] In the reverse osmosis water treatment process, membrane fouling is an important factor affecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 贾培宗王德清
Owner 北京弘扬紫东环保科技有限公司
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