CN113522025A - Reverse osmosis scale inhibitor and preparation method thereof - Google Patents
Reverse osmosis scale inhibitor and preparation method thereof Download PDFInfo
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- CN113522025A CN113522025A CN202110942730.3A CN202110942730A CN113522025A CN 113522025 A CN113522025 A CN 113522025A CN 202110942730 A CN202110942730 A CN 202110942730A CN 113522025 A CN113522025 A CN 113522025A
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 51
- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 34
- 239000004626 polylactic acid Substances 0.000 claims abstract description 34
- 229920001577 copolymer Polymers 0.000 claims abstract description 31
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims abstract description 30
- 239000008367 deionised water Substances 0.000 claims abstract description 29
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 29
- 150000003839 salts Chemical class 0.000 claims abstract description 29
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims abstract description 28
- 239000001509 sodium citrate Substances 0.000 claims abstract description 24
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 4
- 230000001070 adhesive effect Effects 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- WHMDKBIGKVEYHS-IYEMJOQQSA-L Zinc gluconate Chemical compound [Zn+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O WHMDKBIGKVEYHS-IYEMJOQQSA-L 0.000 claims description 16
- 239000011670 zinc gluconate Substances 0.000 claims description 16
- 235000011478 zinc gluconate Nutrition 0.000 claims description 16
- 229960000306 zinc gluconate Drugs 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 50
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000377 silicon dioxide Substances 0.000 abstract description 6
- 239000011575 calcium Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 16
- 239000012528 membrane Substances 0.000 description 15
- 239000000243 solution Substances 0.000 description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 13
- 239000000306 component Substances 0.000 description 13
- 238000005303 weighing Methods 0.000 description 12
- 230000001954 sterilising effect Effects 0.000 description 8
- 238000004659 sterilization and disinfection Methods 0.000 description 8
- 241000195493 Cryptophyta Species 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 241000894006 Bacteria Species 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 235000010216 calcium carbonate Nutrition 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008233 hard water Substances 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 231100000956 nontoxicity Toxicity 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920002197 Sodium polyaspartate Polymers 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000009285 membrane fouling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910052882 wollastonite Inorganic materials 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000668842 Lepidosaphes gloverii Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005791 algae growth Effects 0.000 description 1
- -1 and therefore Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052923 celestite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 229910000391 tricalcium phosphate Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
Abstract
The invention provides a reverse osmosis scale inhibitor and a preparation method thereof, wherein the reverse osmosis scale inhibitor is mainly prepared from the following raw materials: the adhesive comprises, by mass, 10-15 parts of sodium citrate, 15-25 parts of hydrolyzed polymaleic anhydride, 20-25 parts of polyepoxysuccinic acid salt, 10-15 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-5 parts of polylactic acid and 15-44 parts of deionized water. The reverse osmosis scale inhibitor disclosed by the invention has good scale inhibition performance on silica scale and calcium scale, is high in scale inhibition performance, environment-friendly, stable in property and long in storage period, and can ensure long-period stable operation of a system.
Description
Technical Field
The invention relates to the technical field of water treatment medicaments, in particular to a reverse osmosis scale inhibitor and a preparation method thereof.
Background
With the progress of membrane technology, reverse osmosis water treatment technology has been widely applied to water supply and water treatment in the industries of electricity, food, electronics and chemical industryThe field of advanced treatment of sewage reuse. The reverse osmosis membrane is a core component in a demineralized water system, and when insoluble salt substances and colloids are continuously concentrated in a membrane element and exceed the solubility limit of the insoluble salt substances and the colloids in the long-term operation process of reverse osmosis equipment, the insoluble salt substances and the colloids can be scaled on the reverse osmosis membrane surface to cause membrane fouling, so that the higher the demineralized water recovery rate is, the higher the risk of scaling is. In Reverse Osmosis (RO) systems, the common sparingly soluble salt is CaSO4、CaCO3And SiO2Other compounds that may cause fouling are CaF2、BaSO4、SrSO4And Ca3(PO4)2. In the recycling process of the industrial cooling water, the problems of corrosion in different degrees, algae breeding and the like can also occur, so that the problems of efficiency reduction, even corrosion perforation and the like of heat exchange equipment are caused, and great potential safety hazards are brought. Thus preventing membrane fouling and bacterial and algal growth plays a vital role in the operation of reverse osmosis equipment.
In order to protect a reverse osmosis system, a pretreatment unit is added at a water inlet source of many enterprises, and the pretreatment unit generally comprises flocculation, sterilization, filtration and other processes; however, due to the use and control of underground water, enterprises generally adopt surface water, even enterprises in some regions have to use the reclaimed water as the inlet water of the reverse osmosis desalination system, the water sources have complex components, high contents of metal ions, organic matters and microorganisms, and large water quality fluctuation, and pretreatment cannot meet the inlet water requirement of the reverse osmosis system, so that the reverse osmosis membrane is rapidly polluted.
The technical means adopted at present also comprises the use of a scale inhibitor to inhibit scaling, but the reverse osmosis scale inhibitors on the market have uneven performance, poor scale inhibition performance and single performance, and the scaling problem is mainly considered. However, the concentrated water has high ion concentration, which is easy to breed bacteria and algae to cause membrane pollution, and the scale inhibitor does not have the functions of dispersion, sterilization, stripping and the like, and cannot meet the safe operation of a reverse osmosis system.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a reverse osmosis scale inhibitor which has high scale inhibition performance, is suitable for high hard water, contains a sterilization component, can ensure that a membrane is not bred by bacteria and algae, has multiple performances of bacteriostasis, corrosion inhibition and scale inhibition, has the characteristics of simple production process, low cost, no toxicity, no harm and the like, can ensure the long-period stable operation of a reverse osmosis water treatment system, and prolongs the service life of equipment. .
The second purpose of the invention is to provide the preparation method of the reverse osmosis scale inhibitor, which has the advantages of simple operation, mild operation conditions, no pollution, no discharge of three wastes, safety and environmental protection.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a reverse osmosis scale inhibitor which is mainly prepared from the following raw materials: the adhesive comprises, by mass, 10-15 parts of sodium citrate, 15-25 parts of hydrolyzed polymaleic anhydride, 20-25 parts of polyepoxysuccinic acid salt, 10-15 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-5 parts of polylactic acid and 15-44 parts of deionized water.
Preferably, the reverse osmosis scale inhibitor comprises the following raw materials: 11-13 parts of sodium citrate, 17-22 parts of hydrolyzed polymaleic anhydride, 21-23 parts of polyepoxysuccinic acid salt, 12-14 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 2-4 parts of polylactic acid and 24-37 parts of deionized water.
Preferably, the reverse osmosis scale inhibitor comprises the following raw materials: the adhesive comprises, by mass, 12 parts of sodium citrate, 20 parts of hydrolyzed polymaleic anhydride, 22 parts of polyepoxysuccinic acid salt, 13 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 3 parts of polylactic acid and 30 parts of deionized water.
In the prior art, a pretreatment unit is generally added at a water inlet source or a scale inhibitor is added to solve the problem of scaling of a reverse osmosis membrane, wherein the pretreatment unit generally comprises processes such as flocculation, sterilization, filtration and the like; however, due to the use and control of underground water, enterprises generally adopt surface water, even enterprises in some regions have to use the reclaimed water as the inlet water of the reverse osmosis desalination system, the water sources have complex components, high contents of metal ions, organic matters and microorganisms, and large water quality fluctuation, and pretreatment cannot meet the inlet water requirement of the reverse osmosis system, so that the reverse osmosis membrane is rapidly polluted; although the scale inhibitor can solve the scaling problem to a certain extent, the high ion concentration in the concentrated water is easy to breed bacteria and algae to cause membrane pollution, and the reverse osmosis scale inhibitors on the market have uneven performance, poor scale inhibition performance and single performance, do not have the effects of dispersion, sterilization, stripping and the like, and cannot meet the safe operation of a reverse osmosis system.
In order to solve the technical problems, the invention provides a reverse osmosis scale inhibitor which does not need to introduce harmful ions such as chloride ions and the like, has high scale inhibition performance, is suitable for high hard water, contains a sterilization component, can ensure that a membrane is not bred by bacteria and algae, has multiple performances of bacteriostasis, corrosion inhibition and scale inhibition, and has the characteristics of simple production process, low cost, no toxicity, no harm and the like.
Wherein, the sodium citrate is safe, nontoxic, biodegradable and Ca-resistant2+、Mg2+、Fe2+The plasma metal ions have good complexing ability and can play roles in pH regulation and buffering; the hydrolyzed polymaleic anhydride still has good scale inhibition and dispersion effects on carbonate, the scale inhibition time can reach 100h, and the hydrolysis polymaleic anhydride has good scale inhibition and dispersion effects on Ba2+、Ca2+、Mg2+、Fe3+、Cu2+The plasma has stronger chelating capacity, not only has dispersing and condensing functions, but also can interfere the normal arrangement of crystal lattices in the crystallization process of inorganic scale, thereby achieving the purposes of scale inhibition and scale prevention; the polyepoxysuccinic acid can keep metal ions in a dissolved state for a long time, has the performance of chelating polyvalent metal ions, and can change the molecular arrangement of scale ions so as to inhibit the formation of scale; the polyepoxysuccinic acid molecule does not contain N, P, the scale inhibition effect is not affected by the concentration of chlorine, and the polyepoxysuccinic acid belongs to a green environment-friendly medicament; acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS) is a good scale inhibition and dispersion agent, is copolymerized by acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, has excellent performance of dispersing iron, zinc hydroxide, calcium carbonate and calcium phosphate in alkaline aqueous solution, has sulfonic acid groups which are strong acid groups, can improve the capability of the polymer in resisting cation precipitation, stabilize zinc salt, inhibit the formation of phosphate and have good component on ferric oxideThe scale inhibitor has dispersing capacity, is particularly suitable for water with high pH, high alkalinity and high hardness, and is one of the most ideal scale inhibiting and dispersing agents for realizing high concentration multiple operation; the polylactic acid has good biodegradability, can be completely degraded by microorganisms in the nature after being used, finally generates carbon dioxide and water, does not pollute the environment, and has good compatibility and degradability.
In addition, the components have good compounding effect, for example, the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is matched with the hydrolytic polymaleic anhydride, so that the adsorption capacity on solid suspension can be improved, the solid suspension is adsorbed and dispersed in water, and therefore, colloid can not be attached to the surface of the membrane, the colloid pollution is further controlled, and the scale inhibition effect and the scale prevention effect can be obviously enhanced; by matching the polyepoxysuccinic acid salt with the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer and the hydrolyzed polymaleic anhydride, the scale inhibition capability can be further enhanced, and the scale inhibition effect is improved; by applying the components and utilizing the compounding effect among the components, the invention can ensure excellent scale inhibition effect on CaCO3、CaSiO3、CaSO4The scale has excellent scale inhibition performance, has a sterilization effect, can ensure that the membrane is not bred by bacteria and algae, is environment-friendly, has stable property and long storage period, and can ensure the long-term stable operation of the reverse osmosis membrane system.
Preferably, the raw material further comprises zinc gluconate.
Preferably, the mass ratio of the zinc gluconate to the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 1: 1.
By adding the zinc gluconate, on one hand, the zinc gluconate can be compounded with hydrolyzed polymaleic anhydride to improve the slow release effect, and on the other hand, the zinc gluconate can be compounded with acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer to improve the slow release scale inhibition capability of the zinc gluconate.
The invention also provides a preparation method of the reverse osmosis scale inhibitor, which comprises the following steps:
s1, mixing sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer in parts by mass, adding half of deionized water in parts by mass, and stirring and dissolving until the liquid is viscous;
s2, dissolving polylactic acid in half mass part of deionized water;
s3, stirring the material prepared in the step S1 and dropwise adding the solution prepared in the step S2;
and S4, preserving heat and storing after the dropwise adding is finished, and obtaining the reverse osmosis scale inhibitor after temperature reduction treatment.
Preferably, the stirring temperature of the step S1 is 40-55 ℃, and the stirring time is 2-3 h.
Preferably, in the step S3, the stirring temperature is 70-80 ℃, the dropping time is 5-6h, and the stirring is continued for 0.5-1h after the dropping is finished.
Preferably, the heat preservation time in the step S4 is 3-4 h.
Preferably, the temperature reduction treatment comprises: and cooling the mixture stored in the heat preservation way to 20-25 ℃.
The preparation method disclosed by the invention is simple to operate, mild in operation condition, free of pollution, free of three-waste discharge, safe and environment-friendly.
Compared with the prior art, the invention has the beneficial effects that:
(1) the calcium carbonate scale inhibition efficiency of the product is as high as 99.4%, the adding amount is small, the product is environment-friendly, the property is stable, the storage period is long, and the long-period stable operation of a system can be ensured;
(2) the scale inhibitor has excellent silicon scale inhibition performance, and has excellent scale inhibition performance on CaCO3, CaSiO3 and CaSO4 scales;
(3) the reverse osmosis scale inhibitor has high scale inhibition performance, is suitable for high hard water, contains a sterilization component, can ensure that a membrane is not bred by bacteria and algae, has multiple performances of bacteriostasis, corrosion inhibition and scale inhibition, and has the characteristics of simple production process, low cost, no toxicity, no harm and the like.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
Weighing the following raw materials: 10g of sodium citrate, 15g of hydrolyzed polymaleic anhydride, 20g of polyepoxysuccinic acid salt, 10g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1g of polylactic acid and 44g of deionized water.
After weighing is finished, pouring sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving for 2 hours at the temperature of 40 ℃ until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 70 ℃, dropwise adding a polylactic acid solution, and controlling the flow rate for 5 hours; and (3) continuing stirring for 0.5h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 3h, and finally cooling the materials in the reaction kettle to 20 ℃ to obtain the reverse osmosis scale inhibitor.
Example 2
Weighing the following raw materials: 11g of sodium citrate, 17g of hydrolyzed polymaleic anhydride, 21g of polyepoxysuccinic acid salt, 12g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 2g of polylactic acid and 37g of deionized water.
After weighing is finished, pouring sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving for 2 hours at the temperature of 45 ℃ until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 70 ℃, dropwise adding a polylactic acid solution, and controlling the flow rate for 5 hours; and (3) continuing stirring for 0.5h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 3h, and finally cooling the materials in the reaction kettle to 20 ℃ to obtain the reverse osmosis scale inhibitor.
Example 3
Weighing the following raw materials: 12g of sodium citrate, 20g of hydrolyzed polymaleic anhydride, 22g of polyepoxysuccinic acid salt, 13g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 3g of polylactic acid and 30g of deionized water.
After weighing is finished, pouring sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving at the temperature of 50 ℃ for 2.5 hours until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 75 ℃, dropwise adding a polylactic acid solution, controlling the flow rate, and controlling the dropwise adding time to be 5.5 h; and (3) continuing stirring for 1h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 3.5h, and finally cooling the materials in the reaction kettle to 22 ℃ to obtain the reverse osmosis scale inhibitor.
Example 4
Weighing the following raw materials: 13g of sodium citrate, 22g of hydrolyzed polymaleic anhydride, 23g of polyepoxysuccinic acid salt, 14g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 4g of polylactic acid and 24g of deionized water.
After weighing is finished, pouring sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving for 3 hours at the temperature of 55 ℃ until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 80 ℃, dropwise adding a polylactic acid solution, and controlling the flow rate for 6 hours; and (3) continuing stirring for 1h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 4h, and finally cooling the materials in the reaction kettle to 25 ℃ to obtain the reverse osmosis scale inhibitor.
Example 5
Weighing the following raw materials: 15g of sodium citrate, 25g of hydrolyzed polymaleic anhydride, 25g of polyepoxysuccinic acid salt, 15g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 5g of polylactic acid and 15g of deionized water.
After weighing is finished, pouring sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving for 3 hours at the temperature of 55 ℃ until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 80 ℃, dropwise adding a polylactic acid solution, and controlling the flow rate for 6 hours; and (3) continuing stirring for 1h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 4h, and finally cooling the materials in the reaction kettle to 25 ℃ to obtain the reverse osmosis scale inhibitor.
Example 6
Weighing the following raw materials: 12g of sodium citrate, 20g of hydrolyzed polymaleic anhydride, 22g of polyepoxysuccinic acid salt, 13g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 3g of polylactic acid, 13g of zinc gluconate and 30g of deionized water.
After weighing is finished, pouring sodium citrate, zinc gluconate, hydrolyzed polymaleic anhydride, polyepoxysuccinate and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a reaction kettle for mixing, adding half of deionized water, and stirring and dissolving at the temperature of 50 ℃ for 2.5 hours until the liquid is viscous; simultaneously dissolving polylactic acid in half of deionized water to obtain a polylactic acid solution;
then stirring the materials prepared in the reaction kettle at the temperature of 75 ℃, dropwise adding a polylactic acid solution, controlling the flow rate, and controlling the dropwise adding time to be 5.5 h; and (3) continuing stirring for 1h after the dropwise addition is finished, then preserving the heat of the materials in the reaction kettle for 3.5h, and finally cooling the materials in the reaction kettle to 22 ℃ to obtain the reverse osmosis scale inhibitor.
Comparative example 1
The specific procedure was as in example 3 except that the acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer was not added.
Comparative example 2
The specific procedure is in accordance with example 3, except that no addition of water is used to depolymerize the maleic anhydride.
Comparative example 3
The specific procedure is identical to that of example 3, except that polyepoxysuccinic acid salt is added.
Comparative example 4
The procedure was carried out in accordance with example 3, except that 20g of an acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer was added.
Comparative example 5
The procedure was carried out in accordance with example 3, except that 30g of the polymaleic anhydride was added to the water.
Comparative example 6
The procedure was as in example 3 except that 30g of polyepoxysuccinic acid salt was added.
Comparative example 7
The procedure was as in example 6 except that 5g of zinc gluconate was added.
Comparative example 8
The procedure was as in example 6 except that 20g of zinc gluconate was added.
Experimental example 1
The scale inhibition effects of the reverse osmosis scale inhibitors of examples 1 to 6 and comparative examples 1 to 6 and the commercial single-component scale inhibitor (a single-component scale inhibitor containing only polyepoxysuccinic acid (Richer environmental protection technologies, Inc., Wuxi), sodium citrate (Yipolio chemical industries, Ltd., Suzhou) or sodium polyaspartate (Shandong remote chemical industries, Ltd.)) were counted, and the specific results are shown in the following table 1:
TABLE 1 test results
As can be seen from the above table, the scale inhibitor special for reverse osmosis has good scale inhibition performance on silica scale and calcium scale. The scale inhibition effect of the embodiment 6 is the best, the scale inhibition rate on calcium carbonate can reach 98.9%, and the scale inhibition rate on silicon dioxide can reach 96.2%. Comparing example 3 with example 6, it can be found that the scale inhibition performance on calcium carbonate and silicon dioxide can be remarkably improved by adding zinc gluconate; comparing example 6 with comparative examples 7 and 8, it can be seen that the scale inhibition performance of comparative example 7 is inferior to that of example 6, which shows that the scale inhibition performance is not improved very much when the amount of added zinc gluconate is low, while the scale inhibition performance of comparative example 8 is almost the same as that of example 6, which shows that the scale inhibition performance of the scale inhibitor is not improved much by adding more zinc gluconate, and the cost can be saved under the condition of the maximum gain of the scale inhibition performance only when the ratio of the added zinc gluconate to the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is maintained at 1: 1.
Comparing example 3 with comparative examples 1 and 4, it can be found that the scale inhibition performance of the scale inhibitor is affected when the addition amount of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is too high or too low, and therefore, the scale inhibition performance can be maximally exerted only when the addition amount is maintained within the ratio defined by the present invention.
Comparing example 3 with comparative examples 2 and 5, it can be found that the scale inhibition performance of the scale inhibitor is affected when the addition amount of the hydrolyzed polymaleic anhydride is too high or too low, and therefore, the scale inhibition performance can be maximally exerted only when the addition amount is maintained within the ratio defined by the invention.
Comparing example 3 with comparative examples 3 and 6, it can be found that the scale inhibition performance of the scale inhibitor is affected when the addition amount of the polyepoxysuccinic acid salt is too high or too low, and therefore, the scale inhibition performance can be maximally exerted only when the polyepoxysuccinic acid salt is maintained within the ratio defined by the invention.
In a word, the reverse osmosis scale inhibitor disclosed by the invention has good scale inhibition performance on silica scale and calcium scale, is high in scale inhibition performance, environment-friendly, stable in property and long in storage period, and can ensure long-period stable operation of a system.
Experimental example 2:
on-site statistics of the effective time of the reverse osmosis scale inhibitors of examples 1 to 6 and comparative examples 1 to 6 and the scale inhibitors with single component (single component scale inhibitor containing only polyepoxysuccinic acid, sodium citrate or sodium polyaspartate) on the market are mainly reflected by the comparison of the scale inhibition effect under different production time periods, and the specific results are shown in the following table 2:
TABLE 2 test results
As for the experimental examples of the effective time of the scale inhibitor, the results in the table show that the scale inhibitor of the invention has long scale inhibition period and can exert the scale inhibition effect for a long time.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (10)
1. A reverse osmosis scale inhibitor is characterized by being mainly prepared from the following raw materials: the adhesive comprises, by mass, 10-15 parts of sodium citrate, 15-25 parts of hydrolyzed polymaleic anhydride, 20-25 parts of polyepoxysuccinic acid salt, 10-15 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-5 parts of polylactic acid and 15-44 parts of deionized water.
2. The reverse osmosis scale inhibitor as claimed in claim 1, wherein the scale inhibitor comprises, by mass, 11-13 parts of sodium citrate, 17-22 parts of hydrolyzed polymaleic anhydride, 21-23 parts of polyepoxysuccinic acid salt, 12-14 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 2-4 parts of polylactic acid, and 24-37 parts of deionized water.
3. The reverse osmosis scale inhibitor according to claim 2, wherein the scale inhibitor comprises, by mass, 12 parts of sodium citrate, 20 parts of hydrolyzed polymaleic anhydride, 22 parts of polyepoxysuccinic acid salt, 13 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 3 parts of polylactic acid and 30 parts of deionized water.
4. The agent for water treatment according to any one of claims 1 to 3, wherein said raw material further comprises zinc gluconate.
5. The reverse osmosis scale inhibitor according to claim 4, wherein the mass ratio of the zinc gluconate to the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 1: 1.
6. A method for preparing the reverse osmosis scale inhibitor according to any one of claims 1 to 5, comprising the steps of:
s1, mixing sodium citrate, hydrolyzed polymaleic anhydride, polyepoxysuccinic acid salt and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer in parts by mass, adding half of deionized water in parts by mass, and stirring and dissolving until the liquid is viscous;
s2, dissolving polylactic acid in half mass part of deionized water;
s3, stirring the material prepared in the step S1 and dropwise adding the solution prepared in the step S2;
and S4, preserving heat and storing after the dropwise adding is finished, and obtaining the reverse osmosis scale inhibitor after temperature reduction treatment.
7. The method according to claim 6, wherein the stirring temperature in the step S1 is 40-55 ℃ and the stirring time is 2-3 hours.
8. The preparation method according to claim 6, wherein in the step S3, the stirring temperature is 70-80 ℃, the dropping time is 5-6h, and the stirring is continued for 0.5-1h after the dropping is completed.
9. The method according to claim 6, wherein the holding time in the step of S4 is 3 to 4 hours.
10. The method according to claim 6, wherein the temperature reduction treatment comprises: and cooling the mixture stored in the heat preservation way to 20-25 ℃.
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