CN108383251B - Preparation method of scale inhibitor - Google Patents
Preparation method of scale inhibitor Download PDFInfo
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- CN108383251B CN108383251B CN201810383534.5A CN201810383534A CN108383251B CN 108383251 B CN108383251 B CN 108383251B CN 201810383534 A CN201810383534 A CN 201810383534A CN 108383251 B CN108383251 B CN 108383251B
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- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 108010064470 polyaspartate Proteins 0.000 claims abstract description 63
- 229920000805 Polyaspartic acid Polymers 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 12
- 230000005764 inhibitory process Effects 0.000 claims abstract description 12
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 229920001577 copolymer Polymers 0.000 claims abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 239000013078 crystal Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- PEEHTFAAVSWFBL-UHFFFAOYSA-N Maleimide Chemical compound O=C1NC(=O)C=C1 PEEHTFAAVSWFBL-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000003301 hydrolyzing effect Effects 0.000 claims description 5
- 238000007603 infrared drying Methods 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- 238000006068 polycondensation reaction Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000011345 viscous material Substances 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 102100035024 Carboxypeptidase B Human genes 0.000 claims 4
- 101000946524 Homo sapiens Carboxypeptidase B Proteins 0.000 claims 4
- 230000003472 neutralizing effect Effects 0.000 claims 1
- 238000001308 synthesis method Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZMYKITJYWFYRFJ-UHFFFAOYSA-N 4-oxo-4-(2-phenylethylamino)butanoic acid Chemical compound OC(=O)CCC(=O)NCCC1=CC=CC=C1 ZMYKITJYWFYRFJ-UHFFFAOYSA-N 0.000 description 1
- -1 CSN compound Chemical class 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001677188 Coccus viridis Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
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
- C02F5/12—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 containing nitrogen
Abstract
The invention relates to the field of preparation methods of scale inhibitors. In particular to a preparation method of a scale inhibitor with good biodegradability and water solubility applied to a water treatment agent. The method comprises the following steps: preparing Polyaspartic Acid (PASP); preparing a polyaspartic acid derivative scale inhibitor (TH-PASP for short); the polyaspartic acid derivative scale inhibitor is measured by 1 liter of water, and when the scale inhibitor is added, the scale inhibition rate is obviously higher than that of a single or compound scale inhibitor prepared from maleic anhydride and thiourea and a CSN-PASP copolymer. The invention improves the original scale inhibition capacity of the polyaspartic acid and finally achieves the purpose of improving the scale inhibition efficiency. The method is not changed, but the synthesis method is changed during synthesis, and a small molecular substance is added, so that the aim of increasing the scale inhibition performance of the polyaspartic acid is fulfilled.
Description
Technical Field
The invention relates to a preparation technology of a polyaspartic acid derivative scale inhibitor. In particular to a preparation method of a scale inhibitor polyaspartic acid derivative.
Background
In recent years, with the development of industry, the problem of scaling of metal ions such as calcium and magnesium in industrial water in equipment or pipelines is increasingly remarkable, and the research on scale inhibitors is more and more focused. In many scale inhibitors, the problems of high use cost, low scale inhibition rate, harm to the environment and the like exist, and the update products of the green scale inhibitors recognized at home and abroad at present become the research and development hot spots. Researches show that the optimized synthesis method increases functional groups on the PASP main chain through graft modification, so that the PASP has higher scale inhibition rate, and the method is a new trend for researching PASP scale inhibitors.
Disclosure of Invention
The invention aims to solve the problems of low scale inhibition efficiency and harm to the environment of the existing scale inhibitor, and provides a synthesis method of a polyaspartic acid derivative scale inhibitor, which has the advantages of good solubility in water, no toxicity or harm to the environment, biodegradability, high scale inhibition efficiency and low production cost.
The technical scheme is as follows: a method for preparing a scale inhibitor, the method comprising the steps of:
A. preparation of Polyaspartic Acid (PASP)
Synthesis of PSI: adding 9.8-29.4 g of maleic anhydride and 20-60 mL of deionized water into a three-neck flask, stirring and heating to 84-86 ℃, and then slowly adding ammonia water according to the mass ratio of 1: 1.25 of maleic anhydride to ammonia water. Hydrolyzing for 1.5-3 h, and distilling under reduced pressure to obtain white flaky crystal maleimide. And (3) dropwise adding deionized water until the maleimide is just dissolved, and then carrying out polycondensation reaction at the temperature of 200-220 ℃ for 40-60 min to obtain a brownish red sticky substance, namely Polysuccinimide (PSI).
Synthesis of PASP: PSI is just dissolved by deionized water, and then 4mL-12mL of 3mol/L sodium hydroxide is added into a water bath with the temperature of 65-75 ℃ for hydrolysis for 45min-55 min. The pH was measured at about 9.5-10.5 and neutralized with hydrochloric acid to 7. Washing with anhydrous ethanol, filtering, and drying to obtain Polyaspartic Acid (PASP).
B. Preparation of polyaspartic acid derivative scale inhibitor (TH-PASP for short)
And (2) putting the product PASP obtained in the step (A) into a three-neck flask, adding 2.0g-4.0g of thiourea into the three-neck flask for 2-3 times, heating the mixture in a methyl silicone oil bath, starting to adjust the pH value to be 6.0-7.5 after the temperature is increased to 80-90 ℃, stopping heating when a reaction system is changed into an orange viscous substance after fully stirring and reacting for 1.0-2.0 hours, drying under an infrared drying lamp to obtain a polyaspartic acid derivative (TH-PASP), and grinding and hermetically storing the polyaspartic acid derivative (TH-PASP) for later use.
Preferably, the ratio of the polyaspartic acid PASP to the thiourea is 2: 1 by weight.
Preferably, the finished product of the polyaspartic acid derivative TH-PASP is ground to 60 meshes by a grinder.
The invention discloses a preparation method of a polyaspartic acid derivative scale inhibitor, belonging to a polymer type scale inhibitor. The polyaspartic acid derivative TH-PASP has no phosphorus in the molecule, no toxicity, no damage to ecological environment, good biodegradability and water solubility, and excellent scale inhibition performance, and is particularly suitable for industrial water treatment. The remarkable effects are as follows: the method does not need to change other process conditions, only adds a small molecular substance into the polyaspartic acid PASP molecules, improves the linear structure of the polyaspartic acid PASP molecules, increases branched chains, has multifunctionality of PESA, achieves the aim of increasing calcium carbonate and calcium sulfate resistance of polyaspartic acid derivatives TH-PASP, and further widens the application range of the polyaspartic acid PASP.
Description of the drawings:
fig. 1 and 2 are schematic scanning diagrams of crystal forms of the calcium carbonate without and with the addition of TH-PASP according to the invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The preparation method of the polyaspartic acid derivative TH-PASP scale inhibitor comprises the following steps:
example 1:
A. preparation of Polyaspartic Acid (PASP)
Synthesis of PSI: 9.8g of maleic anhydride and 20mL of deionized water were added to a three-necked flask, stirred and heated to 84 ℃, and then ammonia was slowly added thereto in a mass ratio of maleic anhydride to ammonia of 1: 1.25. Hydrolyzing for 1.5h, and distilling under reduced pressure to obtain white flaky crystal maleimide. And (3) dropwise adding deionized water until the maleimide is just dissolved, and then carrying out polycondensation reaction at 200 ℃ for 40min to obtain a brownish red viscous substance, namely Polysuccinimide (PSI).
Synthesis of PASP: PSI was dissolved with deionized water and then hydrolyzed for 45min in a water bath at 65 deg.C by adding 4mL of 3mol/L NaOH. The pH was measured to be about 9.5, and neutralized with hydrochloric acid to make pH 7. Washing with anhydrous ethanol, filtering, and drying to obtain Polyaspartic Acid (PASP).
B. Preparation of polyaspartic acid derivative scale inhibitor (TH-PASP for short)
And (2) putting the product PASP obtained in the step (A) into a three-neck flask, adding 2.0g of thiourea into the three-neck flask by 2-3 times, putting the mixture into a methyl silicone oil bath, heating the mixture, starting to adjust the pH to 6.0 after the temperature is increased to 80 ℃, fully stirring the mixture to react for 1.0h, stopping heating when a reaction system becomes an orange-yellow sticky substance, drying the product PASP under an infrared drying lamp to obtain a polyaspartic acid derivative (TH-PASP), and grinding the polyaspartic acid derivative (TH-PASP) for sealed storage for later use.
Example 2:
A. preparation of Polyaspartic Acid (PASP)
Synthesis of PSI: 19.6g of maleic anhydride and 40mL of deionized water are added into a three-neck flask, stirred and heated to 85 ℃, and then ammonia water is slowly added according to the mass ratio of 1: 1.25 of the maleic anhydride to the ammonia water. Hydrolyzing for 2h, and distilling under reduced pressure to obtain white flaky crystal maleimide. And (3) dropwise adding deionized water until the maleimide is just dissolved, and then carrying out polycondensation reaction for 50min at 210 ℃ to obtain a brownish red sticky substance, namely Polysuccinimide (PSI).
Synthesis of PASP: PSI was dissolved with deionized water and then hydrolyzed by adding 8mL of 3mol/L NaOH for 50min in a water bath at a temperature of 70 ℃. The pH was measured to be about 10, and neutralized with hydrochloric acid to make pH 7. Washing with anhydrous ethanol, filtering, and drying to obtain Polyaspartic Acid (PASP).
B. Preparation of polyaspartic acid derivative scale inhibitor (TH-PASP for short)
And (2) putting the product PASP obtained in the step (A) into a three-neck flask, adding 3.0g of thiourea into the three-neck flask by 2-3 times, putting the three-neck flask into a methyl silicone oil bath, heating, starting to adjust the pH to 7.0 after the temperature is raised to 85 ℃, fully stirring and reacting for 1.5 hours, stopping heating when a reaction system becomes orange-yellow sticky substances, drying under an infrared drying lamp to obtain a polyaspartic acid derivative (TH-PASP), and grinding and hermetically storing for later use.
Example 3:
A. preparation of Polyaspartic Acid (PASP)
Synthesis of PSI: 29.4g of maleic anhydride and 60mL of deionized water were added to a three-necked flask, stirred and heated to 86 ℃, and then ammonia was slowly added thereto in a mass ratio of maleic anhydride to ammonia of 1: 1.25. Hydrolyzing for 3h, and distilling under reduced pressure to obtain white flaky crystal maleimide. And (3) dropwise adding deionized water until the maleimide is just dissolved, and then carrying out polycondensation reaction for 60min at 220 ℃ to obtain a brownish red sticky substance, namely Polysuccinimide (PSI).
Synthesis of PASP: PSI was dissolved with deionized water and then hydrolyzed for 55min in a water bath at 75 deg.C by the addition of 12mL of 3mol/L NaOH. The pH was measured to be about 10.5, and neutralized with hydrochloric acid to make pH 7. Washing with anhydrous ethanol, filtering, and drying to obtain Polyaspartic Acid (PASP).
B. Preparation of polyaspartic acid derivative scale inhibitor (TH-PASP for short)
And (2) putting the product PASP obtained in the step (A) into a three-neck flask, adding 4.0g of thiourea into the three-neck flask by 2-3 times, putting the three-neck flask into a methyl silicone oil bath, heating, starting to adjust the pH to 7.5 after the temperature is increased to 90 ℃, fully stirring and reacting for 2.0 hours, stopping heating when a reaction system becomes orange-yellow sticky substances, drying under an infrared drying lamp to obtain a polyaspartic acid derivative (TH-PASP), and grinding and hermetically storing for later use.
Method of use embodiment
Example 1:
respectively preparing 12mg/L TH-PASP, 12mg/L CSN-PASP, 12mg/L home-made PASP, 12mg/L CSN, 6mg/L home-made PASP and 6mg/L CSN compound solution in a volumetric flask according to the mass concentration ratio by 1 liter of water, then pouring the compound solution into a conical flask, tightly covering the conical flask with a rubber plug with a glass tube, and heating the conical flask in a constant-temperature water bath at 80 ℃ for 10 hours to measure the scale inhibition rate of the medicament. The results are shown in Table 1.
TABLE 1
Example 2:
the present invention is used for the analysis of crystalline forms of calcium carbonate.
The scale forming crystal form of the calcium carbonate is observed by using a microscope. Fig. 1 and fig. 2 are obtained. As can be seen from the figure 1, the calcium carbonate crystals without the scale inhibitor are cubes with regular shapes, smooth surfaces and compact arrangement, while the calcium carbonate crystals with the TH-PASP modified product in the figure 2 have irregular structures, are loose and porous and have disordered crystal forms. The result shows that the crystal lattice of the crystal can be distorted after the TH-PASP scale inhibitor is added, and the original regular and compact structure of the crystal is damaged, thereby preventing the formation of scale. From this, it is understood that the scale inhibition ability of TH-PASP to calcium carbonate is expressed by the effects of lattice distortion and dispersion.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that the present invention is not limited thereto, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A preparation method of a scale inhibitor is characterized in that the preparation method comprises the following steps: synthesis of PSI: adding 9.8-29.4 g of maleic anhydride and 20-60 mL of deionized water into a three-neck flask, stirring and heating to 84-86 ℃, and then slowly adding ammonia water according to the mass ratio of 1: 1.25 of maleic anhydride to ammonia water; hydrolyzing for 1.5-3 h, and distilling under reduced pressure to obtain white flaky crystal maleimide; dropwise adding deionized water until maleimide is just dissolved, and then carrying out polycondensation reaction at 200-220 ℃ for 40-60 min to obtain a brownish red sticky substance, namely Polysuccinimide (PSI); synthesis of PASP: dissolving PSI with deionized water, adding 4-12 mL of 3mol/L sodium hydroxide into water bath at 65-75 ℃ for hydrolysis for 45-55 min; measuring pH to 9.5-10.5, and neutralizing with hydrochloric acid to obtain pH 7; washing with anhydrous ethanol, filtering, and drying to obtain polyaspartic acid PASP; the method is characterized by also comprising the preparation of polyaspartic acid derivative scale inhibitor, the product PASP is put into a three-neck flask, 2.0g to 4.0g of thiourea is added into the three-neck flask by 2 to 3 times, the mixture is put into a methyl silicone oil bath for heating, after the temperature is raised to 80 ℃ to 90 ℃, the pH value is adjusted to 6.0 to 7.5, the mixture is fully stirred and reacted for 1.0h to 2.0h, when the reaction system is changed into orange viscous substance, the heating is stopped, the mixture is dried under an infrared drying lamp, and the polyaspartic acid derivative TH-PASP is obtained and is porphyrized, sealed and stored for standby.
2. The method for preparing the scale inhibitor according to claim 1, which is characterized in that: the ratio of polyaspartic acid PASP to thiourea was 2: 1 by weight.
3. The method for preparing the scale inhibitor according to claim 1, which is characterized in that: the drying adopts an air blast drying oven.
4. The method for preparing the scale inhibitor according to claim 1, which is characterized in that: the finished product of the scale inhibitor TH-PASP is ground to 60 meshes by a grinder.
5. A method for preparing the scale inhibitor according to any one of claims 1 to 4, wherein the scale inhibitor of the polyaspartic acid derivative is calculated by 1 liter of water, and when the scale inhibitor is added, the scale inhibition rate is obviously higher than that of a single or compound mixture of maleic anhydride and thiourea and a CSN-PASP copolymer.
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| CN111517486B (en) * | 2020-04-03 | 2021-06-08 | 河南大学 | Reactive nano poly-silicon/polyaspartic acid polymer scale inhibitor and preparation method thereof |
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| DE4306412A1 (en) * | 1993-03-02 | 1994-09-08 | Bayer Ag | Process for the preparation of polyaspartic acid |
| CN100509652C (en) * | 2007-06-15 | 2009-07-08 | 武汉金坡化工科技有限公司 | No-phosphate corrosion and scale inhibitor and application thereof |
| CN101235145B (en) * | 2007-12-27 | 2010-10-27 | 上海应用技术学院 | Method for preparing glycine/aspartic acid copolymer used as green scale inhibitor |
| CN101428912B (en) * | 2008-12-10 | 2010-11-10 | 河北省能源研究所 | Biodegradable scale inhibitor-carboxylic acid base-containing poly-asparagic acid derivant and method for producing the same |
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