CN117105436A - High-pressure reverse osmosis scale inhibitor and preparation method thereof - Google Patents
High-pressure reverse osmosis scale inhibitor and preparation method thereof Download PDFInfo
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- CN117105436A CN117105436A CN202311304453.9A CN202311304453A CN117105436A CN 117105436 A CN117105436 A CN 117105436A CN 202311304453 A CN202311304453 A CN 202311304453A CN 117105436 A CN117105436 A CN 117105436A
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 34
- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 54
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 51
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 23
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 17
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229910017053 inorganic salt Inorganic materials 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 24
- 239000012528 membrane Substances 0.000 description 18
- 230000005764 inhibitory process Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- IKOKHHBZFDFMJW-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-3-(2-morpholin-4-ylethoxy)pyrazol-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C(=NN(C=1)CC(=O)N1CC2=C(CC1)NN=N2)OCCN1CCOCC1 IKOKHHBZFDFMJW-UHFFFAOYSA-N 0.000 description 1
- APLNAFMUEHKRLM-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(3,4,6,7-tetrahydroimidazo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)N=CN2 APLNAFMUEHKRLM-UHFFFAOYSA-N 0.000 description 1
- LLQHSBBZNDXTIV-UHFFFAOYSA-N 6-[5-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-4,5-dihydro-1,2-oxazol-3-yl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC1CC(=NO1)C1=CC2=C(NC(O2)=O)C=C1 LLQHSBBZNDXTIV-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000668 effect on calcium Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a high-pressure reverse osmosis scale inhibitor and a preparation method thereof, which are mainly prepared from the following raw materials in parts by weight: 10-15 parts of phosphorous acid, 5-8 parts of ammonium persulfate, 15-25 parts of maleic anhydride, 8-12 parts of acrylic acid, 5-10 parts of citric acid, 15-20 parts of sodium hydroxide solution and 20-30 parts of deionized water. The insoluble inorganic salt in the dispersed water can prevent or interfere the precipitation and scaling functions of the insoluble inorganic salt on the metal surface, protect related equipment and prolong the service life of the related equipment.
Description
Technical Field
The invention belongs to the technical field of water treatment medicaments, and particularly relates to a high-pressure reverse osmosis scale inhibitor and a preparation method thereof.
Background
Reverse osmosis is a separation process that separates solutes in solution from solvent by means of selective entrapment by a semipermeable membrane under pressure. The method is widely applied to purification and concentration of various liquids, wherein a common application example is to remove inorganic ions, bacteria, viruses, organic matters, colloid and other impurities in raw water by using a reverse osmosis technology in a water treatment process so as to obtain high-quality purified water. Reverse osmosis water can be a complex quality of fresh water, seawater, groundwater and the like, and the water generally contains scale-forming ions, corrosive ions and other components which are easy to cause pollution and blockage. The working pressure of the low-pressure reverse osmosis membrane is 1.4-2.0MPa, the desalination rate of the low-pressure reverse osmosis membrane is slightly low, the water yield is large, and the energy consumption is greatly reduced. The low-pressure reverse osmosis membrane can be used for high-purity water production in the electronic and pharmaceutical industries, food industry wastewater treatment and drinking water production. The high-pressure reverse osmosis membrane has high working pressure, relatively small water yield and high desalination rate. The high-pressure reverse osmosis is generally an industrial membrane, can be used for high-salt water content, and has the reverse osmosis working pressure of 2.8-4.2MPa. Because of its small water yield and high desalination rate, it is easier to scale relative to low pressure reverse osmosis membranes, and therefore it is desirable to use a scale inhibitor that has excellent scale inhibition properties and good dispersion effects.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the invention is to provide a scale inhibitor for a high-pressure reverse osmosis membrane, which increases the scale inhibition rate of the membrane by improving the selection of raw materials and the corresponding proportion.
The second aim of the invention is to provide the preparation method of the scale inhibitor for the high-pressure reverse osmosis membrane, which is simple and safe, can effectively protect the reverse osmosis element from running stably and prolongs the cleaning period of the membrane.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the high-pressure reverse osmosis scale inhibitor is mainly prepared from the following raw materials in parts by weight: 10-15 parts of phosphorous acid, 5-8 parts of ammonium persulfate, 15-25 parts of maleic anhydride, 8-12 parts of acrylic acid, 5-10 parts of citric acid, 15-20 parts of sodium hydroxide solution and 20-30 parts of deionized water.
Preferably, as a further specific embodiment, 11-14 parts of phosphorous acid, 5-7 parts of ammonium persulfate, 19-23 parts of maleic anhydride, 9-11 parts of acrylic acid, 6-9 parts of citric acid, 17-19 parts of sodium hydroxide solution and 22-28 parts of deionized water.
Preferably, as a further specific embodiment, 12 parts of phosphorous acid, 6 parts of ammonium persulfate, 20 parts of maleic anhydride, 10 parts of acrylic acid, 8 parts of citric acid, 18 parts of sodium hydroxide solution and 25 parts of deionized water.
In the raw materials, the phosphorous acid is dibasic acid, has strong reducibility and acidity, and can reduce hexavalent sulfur to low-valence sulfur, so that the effects of dissolving sulfur-containing insoluble substances and sterilizing are achieved; ammonium persulfate as initiator can break O-O bond inside molecule to form free radical SO 4 And NH 4 These radicals interact with the phosphorous acid and ammonium persulfate molecules and activate them into a more reactive state; in addition, SO 4 Can also be combined with NH 4 + SO formation 3 And N 2 And the gaseous products are released. The maleic anhydride has a plurality of carboxyl groups inside, and has the dual performances of scale inhibition and corrosion inhibition. The acrylic acid and the citric acid are organic acid, and can form a copolymer with the phosphorous acid and the ammonium persulfate, so that the chelation effect on calcium ions is increased, and the scale inhibition effect of the scale inhibitor is improved.
The invention also provides a preparation method of the scale inhibitor for the high-pressure reverse osmosis membrane, which comprises the following steps:
uniformly mixing phosphorous acid, ammonium persulfate and deionized water, then adding maleic anhydride, heating, maintaining the reaction temperature, stopping heating, and continuously stirring and cooling to 20-25 ℃ to obtain a mixed solution 1;
sequentially adding acrylic acid and citric acid into the mixed solution 1, continuously stirring for 30min until the mixture is uniform, and adding sodium hydroxide solution to adjust the pH value.
Preferably, as a further specific embodiment, the temperature is raised to 60.+ -. 5 ℃ after the addition of maleic anhydride.
Preferably, as a further specific embodiment, the pH is adjusted to 6.5-7.5 after the addition of sodium hydroxide solution.
Preferably, as a further specific embodiment, the reaction temperature is maintained for 2 hours in the step of uniformly mixing phosphorous acid, ammonium persulfate and deionized water.
Compared with the prior art, the invention has the beneficial effects that:
(1) The high-pressure reverse osmosis membrane has excellent scale inhibition, complexation and dispersion properties, can effectively protect the stable operation of the reverse osmosis element, and prolongs the cleaning period of the membrane.
(2) The invention has low requirements on equipment and reaction conditions, easily obtained raw materials, low cost, safe and environment-friendly preparation process and higher popularization and application values.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The embodiment provides a scale inhibitor for a high-pressure reverse osmosis membrane: 100g of phosphorous acid, 50g of ammonium persulfate, 150g of maleic anhydride, 80g of acrylic acid, 50g of citric acid, 150g of sodium hydroxide solution and 200g of deionized water.
The high-pressure reverse osmosis scale inhibitor and the preparation method thereof comprise the following steps:
adding deionized water into a reaction kettle, starting stirring, sequentially adding phosphorous acid and ammonium persulfate, adding maleic anhydride, heating to 60+/-5 ℃, keeping the temperature for reaction for 2 hours, stopping heating, and continuously stirring and cooling to 25 ℃;
and (3) sequentially adding acrylic acid and citric acid into the reaction kettle in the step (1), continuously stirring for 30min until the acrylic acid and the citric acid are uniformly mixed, and adding a sodium hydroxide solution to adjust the pH value to 6.5 to obtain the high-pressure reverse osmosis scale inhibitor.
Example 2
The specific operation procedure was the same as in example 1, except that the mass of each component was changed to: 150g of phosphorous acid, 80g of ammonium persulfate, 250g of maleic anhydride, 120g of acrylic acid, 100g of citric acid, 200g of sodium hydroxide solution and 300g of deionized water.
Example 3
The specific operation procedure was the same as in example 1, except that the mass of each component was changed to: 120g of phosphorous acid, 60g of ammonium persulfate, 200g of maleic anhydride, 100g of acrylic acid, 80g of citric acid, 180g of sodium hydroxide solution and 250g of deionized water.
Comparative example 1
The embodiment is the same as in example 1 except that the mass of phosphorous acid is changed to 80g.
Comparative example 2
The embodiment is the same as in example 1 except that the mass of phosphorous acid is changed to 200g.
Comparative example 3
The embodiment is the same as in example 1 except that the mass of ammonium persulfate is changed to 40g.
Comparative example 4
The embodiment is the same as in example 1 except that the mass of ammonium persulfate is changed to 100g.
Comparative example 5
The embodiment is the same as in example 1 except that the mass of maleic anhydride is changed to 40g.
Comparative example 6
The embodiment is the same as in example 1 except that the mass of maleic anhydride is changed to 300g.
Comparative example 7
The embodiment is the same as in example 1 except that the acrylic mass is changed to 50g.
Comparative example 8
The embodiment is the same as in example 1 except that the acrylic mass is changed to 150g.
Comparative example 9
The embodiment is the same as in example 1, except that the pH of the solution is adjusted to 8.
Comparative example 10
The embodiment is the same as in example 1, except that the pH of the solution is adjusted to 6.
Table 1 comparative scale inhibitor performance for high pressure reverse osmosis membranes of examples and comparative examples
| Scale inhibitor | Concentration of drug added mg/L | CaCO 3 Scale inhibition rate% | CaSO 4 Scale inhibition rate% |
| Example 1 | 6 | 96.4 | 95.8 |
| Example 2 | 6 | 95.2 | 94.2 |
| Example 3 | 6 | 97.3 | 96.5 |
| Comparative example 1 | 6 | 75.3 | 70.9 |
| Comparative example 2 | 6 | 78.2 | 74.1 |
| Comparative example 3 | 6 | 74.8 | 72.9 |
| Comparative example 4 | 6 | 77.2 | 73.5 |
| Comparative example 5 | 6 | 75.6 | 70.4 |
| Comparative example 6 | 6 | 78.4 | 76.8 |
| Comparative example 7 | 6 | 72.1 | 70.3 |
| Comparative example 8 | 6 | 74.6 | 73.2 |
| Comparative example 9 | 6 | 66.2 | 60.1 |
| Comparative example 10 | 6 | 65.1 | 63.2 |
From the above data, the following conclusions can be drawn:
as can be seen from the comparison of example 1 with comparative examples 1 to 8, when 10 to 15 parts of phosphorous acid, 5 to 8 parts of ammonium persulfate, 15 to 25 parts of maleic anhydride, 8 to 12 parts of acrylic acid, 5 to 10 parts of citric acid, 15 to 20 parts of sodium hydroxide solution and 20 to 30 parts of deionized water are used in the selection of raw materials 3 And CaSO 4 The scale inhibition rate of (2) can exceed 95%. When the content of phosphorous acid is too high, scale may be secondarily formed, adhere to the inside of the container, and conversely the scale inhibition rate is reduced, whereas when the content of phosphorous acid is low, a void is formed for scaling calcium ions on the heated surface, which is insufficient to prevent calcium scale formation. The ammonium persulfate is heated to decompose into sulfate ion free radicals to initiate polymerization reaction, and excessive amount can cause the decrease of the pH value of a system, and simultaneously the reaction is aggravated, and the temperature is raised too fast; too small an amount may result in too slow a reaction, resulting in too slow a polymerization rate. When the maleic anhydride is excessive, the sodium hydroxide in the components is exhausted, so that the pH of the reaction system is too low to be changed into a strong acid system, other components are deactivated, and when the content of the maleic anhydride is too low, the system is changed into an alkaline system, and CaCO (CaCO) cannot be reached 3 And CaSO 4 And (3) the scale removing effect of the scale is equal.
As is clear from comparison of example 1 with comparative examples 9 to 10, the pH of the reaction system is also important, and CaCO is used when the pH of the reaction system is in the alkaline state 3 、CaSO 4 、BaSO 4 、SrSO 4 、CaF 2 、SiO 2 And other impurities can not be dissolved, so that the scale inhibition purpose can not be achieved; when the system is in a strong acid system, other organic components cannot exert effect, so that the scale inhibition efficiency is too low, and the aim of the invention cannot be achieved. Therefore, the pH is maintained at 6.5 to 7.5, and most preferably at 6.5.
Therefore, in summary, under a weak acid system, when 10-15 parts of phosphorous acid, 5-8 parts of ammonium persulfate, 15-25 parts of maleic anhydride, 8-12 parts of acrylic acid, 5-10 parts of citric acid, 15-20 parts of sodium hydroxide solution and 20-30 parts of deionized water are used, the high-pressure reverse osmosis membrane system has excellent scale inhibition, complexing and dispersion properties, can effectively protect the stable operation of a reverse osmosis element, and prolongs the cleaning period of the membrane.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The high-pressure reverse osmosis scale inhibitor is characterized by being prepared from the following raw materials in parts by weight: 10-15 parts of phosphorous acid, 5-8 parts of ammonium persulfate, 15-25 parts of maleic anhydride, 8-12 parts of acrylic acid, 5-10 parts of citric acid, 15-20 parts of sodium hydroxide solution and 20-30 parts of deionized water.
2. The high pressure reverse osmosis scale inhibitor according to claim 1, wherein 11-14 parts of phosphorous acid, 5-7 parts of ammonium persulfate, 19-23 parts of maleic anhydride, 9-11 parts of acrylic acid, 6-9 parts of citric acid, 17-19 parts of sodium hydroxide solution and 22-28 parts of deionized water.
3. The high pressure reverse osmosis scale inhibitor according to claim 1, wherein the phosphorous acid is 12 parts, ammonium persulfate is 6 parts, maleic anhydride is 20 parts, acrylic acid is 10 parts, citric acid is 8 parts, sodium hydroxide solution is 18 parts, and deionized water is 25 parts.
4. A method of preparing a high pressure reverse osmosis scale inhibitor according to any one of claims 1 to 3, comprising the steps of:
uniformly mixing phosphorous acid, ammonium persulfate and deionized water, then adding maleic anhydride, heating, maintaining the reaction temperature, stopping heating, and continuously stirring and cooling to 20-25 ℃ to obtain a mixed solution 1;
sequentially adding acrylic acid and citric acid into the mixed solution 1, continuously stirring for 30min until the mixture is uniform, and adding sodium hydroxide solution to adjust the pH value.
5. The method for preparing a high-pressure reverse osmosis scale inhibitor according to claim 4, wherein the temperature is raised to 60+ -5 ℃ after the maleic anhydride is added.
6. The method for preparing a high-pressure reverse osmosis scale inhibitor according to claim 4, wherein the pH is adjusted to 6.5-7.5 after adding sodium hydroxide solution.
7. The method for preparing a high pressure reverse osmosis scale inhibitor according to claim 4, wherein the reaction temperature is maintained for 2 hours in the step of uniformly mixing phosphorous acid, ammonium persulfate and deionized water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311304453.9A CN117105436A (en) | 2023-10-10 | 2023-10-10 | High-pressure reverse osmosis scale inhibitor and preparation method thereof |
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