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Reverse-osmosis scale inhibitor

A scale inhibitor and reverse osmosis technology, applied in the field of water treatment, can solve the problems of poor scale inhibition effect and achieve high scale inhibition rate, strong scale inhibition and dispersion effect, and high tolerance

Active Publication Date: 2017-10-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] By providing a reverse osmosis scale inhibitor, the present invention solves the technical problem that the existing reverse osmosis scale inhibitor has poor scale inhibition effect on water quality with high hardness and high sulfate concentration

Method used

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preparation example Construction

[0029] See figure 1 In the embodiment of the present invention, the preparation method of the crotonic acid-acrylamide-hydroxypropyl acrylate copolymer includes the following steps:

[0030] S101: Add a certain amount of water to the reaction kettle and heat it to 60-90°C, add a proper amount of isopropanol to obtain a reaction system; wherein, the added amount of water is calculated based on the theoretical solid content of 19%-38%. The weight ratio of isopropanol to water is 1:6-8;

[0031] Among them, water is the solvent for the polymerization reaction, and isopropanol is used to adjust the molecular weight of the polymer.

[0032] S102: Add mixed monomers and initiators dropwise to the reaction system, and the temperature of the system during the dropping process is controlled at 70-95°C; wherein, the mixed monomers are composed of crotonic acid, acrylamide and hydroxypropyl acrylate, The weight ratio is 10-30:5-10:10-30;

[0033] S103: After the dripping of the mixed monomer a...

Embodiment 1

[0040] S1: Preparation of crotonic acid-acrylamide-hydroxypropyl acrylate copolymer:

[0041] Add 105 g of water into the reaction kettle, heat it to 60°C, and add 17.5 g of isopropanol to obtain a reaction system;

[0042] The mixed monomer and ammonium persulfate aqueous solution were added dropwise to the reaction system, and the temperature of the system during the dropping process was controlled at 70°C; wherein, the mixed monomer was composed of 10g crotonic acid, 5g acrylamide and 10g hydroxypropyl acrylate , The dosage of ammonium persulfate is 0.125g;

[0043] After the dropwise addition of the mixed monomer and the initiator is completed, the system is heated to 95° C., and the temperature is kept for 8 hours to obtain the crotonic acid-acrylamide-hydroxypropyl acrylate copolymer.

[0044] S2: Weigh 35g polyaminopolyether methylene phosphonic acid (PAPEMP), 40g crotonic acid-acrylamide-hydroxypropyl acrylate copolymer, 5g ethylenediaminetetramethylene phosphonic acid (EDTMPA...

Embodiment 2

[0049] S1: Preparation of crotonic acid-acrylamide-hydroxypropyl acrylate copolymer:

[0050] Add 150g of water into the reaction kettle, heat it to 70°C, and add 25g of isopropanol to obtain a reaction system;

[0051] The mixed monomer and ammonium persulfate aqueous solution were added dropwise to the reaction system, and the temperature of the system during the dropping process was controlled at 80°C; wherein, the mixed monomer was composed of 30g crotonic acid, 5g acrylamide and 15g hydroxypropyl acrylate , The dosage of ammonium persulfate is 0.5g;

[0052] After the dropwise addition of the mixed monomers and the initiator is completed, the system is heated to 100° C., and the temperature is kept for 6 hours to obtain the crotonic acid-acrylamide-hydroxypropyl acrylate copolymer.

[0053] S2: Weigh 45g polyaminopolyether methylene phosphonic acid (PAPEMP), 35g crotonic acid-acrylamide-hydroxypropyl acrylate copolymer, 5g ethylenediaminetetramethylene phosphonic acid (EDTMPA) an...

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Abstract

The invention discloses a reverse-osmosis scale inhibitor and belongs to the technical field of water treatment. Based on 100 parts by weight of the reverse-osmosis scale inhibitor, the reverse-osmosis scale inhibitor comprises 30 to 50 parts by weight of polyamino polyether methylene phosphonate, 30 to 60 parts by weight of a butenoic acid-acrylamide-hydroxypropyl acrylate copolymer, 3 to 5 parts by weight of ethylenediaminetetra(methylenephosphonic acid) and 10 to 20 parts by weight of water. According to the reverse-osmosis scale inhibitor disclosed by the invention, all components in a formula have a synergistic effect and the technical problem of an existing reverse-osmosis scale inhibitor that the scale inhibition effect on water quality with high rigidity and high sulfate concentration is poor is solved; and the reverse-osmosis scale inhibitor is suitable for a reverse-osmosis desalting system for the water quality with the high rigidity and high sulfate concentration and is used for preventing a condition that salt in the water is enriched to form scale and a reverse-osmosis membrane is polluted and blocked.

Description

Technical field [0001] The invention relates to the technical field of water treatment, in particular to a reverse osmosis scale inhibitor. Background technique [0002] Reverse osmosis technology uses reverse osmosis membranes to separate water and water ions, so as to achieve the purpose of purifying water. In the process of water separation, because water continuously permeates the reverse osmosis membrane, the salt in the water is enriched on the inlet side of the membrane to form concentrated water. When the slightly soluble salt in the concentrated water exceeds its solubility product, it will precipitate and cause fouling. Block the reverse osmosis membrane. Therefore, in order to prevent the reverse osmosis membrane from being fouled by the salt-rich dirt in the water, measures are generally taken to add an appropriate amount of scale inhibitor (or reverse osmosis membrane protector) at the inlet of the reverse osmosis system to protect the reverse osmosis membrane. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/08B01D61/02C02F1/44
CPCB01D61/025B01D65/08B01D2321/16C02F1/441
Inventor 刘旭明张跃洋赵路遥董舒宇
Owner SHOUGANG CORPORATION
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