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Copolymer and its preparation method and reverse osmosis membrane protective agent comprising the copolymer and its uses

A technology of reverse osmosis membrane and copolymer, used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve the effect of reducing eutrophication pollution, high scale inhibition rate and low phosphorus content

Inactive Publication Date: 2007-12-26
北京博泰盛合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to avoid the deficiencies in the above-mentioned prior art, and provide a kind of crotonic acid-acrolein-hydroxypropyl acrylate copolymer and its preparation method, the copolymer is easy to form colloidal metal oxidation in water The substance has excellent adsorption stability and is dispersed in reverse osmosis concentrated water to prevent it from adhering to the reverse osmosis membrane and causing membrane fouling; meanwhile, the present invention also provides a reverse osmosis membrane containing the copolymer Protective agent and its application in reverse osmosis system, the reverse osmosis membrane protective agent has low phosphorus content, has good adsorption, stabilization and dispersion effects on colloidal pollutants, low dosage, and high scale inhibition rate

Method used

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  • Copolymer and its preparation method and reverse osmosis membrane protective agent comprising the copolymer and its uses
  • Copolymer and its preparation method and reverse osmosis membrane protective agent comprising the copolymer and its uses

Examples

Experimental program
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Embodiment 1

[0034] Preparation of crotonic acid-acrolein-hydroxypropyl acrylate copolymer.

[0035]First take by weighing 170 kilograms of crotonic acid, 7 kilograms of sodium hypophosphite, 7 kilograms of ammonium persulfate, 50 kilograms of acrolein, and 200 kilograms of hydroxypropyl acrylate for subsequent use. Then crotonic acid is sucked into two layers of crotonic acid dripping tanks with a vacuum pump; sodium hypophosphite is dissolved in water to 40 kg for subsequent use; The aldehyde is inhaled into the two-layer acrolein dropping tank with a vacuum pump; the hydroxypropyl acrylate is sucked into the two-layer hydroxypropyl acrylate dropping tank with a vacuum pump; 194 kg of water is added to the reaction kettle.

[0036] Then turn on the condenser valve, cooling pump, and reactor stirring paddle switch; open the steam valve to heat the water in the reactor to 68±2°C, and add the prepared sodium hypophosphite aqueous solution. Continue to raise the temperature to 72±2°C and ke...

Embodiment 2

[0040] Repeat embodiment 1, have following difference: take by weighing 160 kilograms of crotonic acid. Pass into cooling water in the reactor jacket, make material temperature drop to 45 ℃, then take 10 grams of material and measure solid content, record solid content to be 72.84%. According to its solid content, 300 kg of water was added into the reactor to obtain a crotonic acid-acrolein-hydroxypropyl acrylate copolymer with a solid content of 50.7%.

[0041] The copolymer obtained by this method, its average molecular weight: 128600; pH value (1% aqueous solution): 1.84, density: 1.29g / cm 3 ; Intrinsic viscosity at 30°C: 0.092dl / g.

Embodiment 3

[0043] Repeat embodiment 1, have following difference: take by weighing 160 kilograms of crotonic acid, 190 kilograms of hydroxypropyl acrylate. Pass into cooling water in the reactor jacket, make material temperature drop to 45 ℃, then take 10 grams of material for solid content measurement, record solid content to be 72.73%. According to its solid content, 300 kg of water was added into the reactor to obtain a crotonic acid-acrolein-hydroxypropyl acrylate copolymer with a solid content of 50.4%.

[0044] The copolymer obtained by this method, its average molecular weight: 118100; pH value (1% aqueous solution): 2.06; Density: 1.22g / cm 3 ; Intrinsic viscosity at 30°C: 0.084dl / g.

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Abstract

This invention provides a butenoic acid-propenal-acroleic propyl ester polymer and method for making same. This polymer has a superior absorption and stability performance to metallic oxide which can easily form colloid in water, and can disperse the metallic oxide in reverse osmosis concentrated water. Meanwhile, this invention also provides a reverse osmosis membrane protecting agent comprising the said polymer and uses thereof. This protecting agent comprises: 2-phosphonic butane-1,2,4-tricabroxylic acid 10-30 share, butenoic acid-propenal-acroleic propyl ester polymer 30-60 share, polyaspartic acid 10-40 share, water 10-20 share. This protecting agent is characterized of superior absorption, stabilization and stabilization to colloidal pollutant, low phosphorus content, low commissioning amount and high antisludging rate in the reverse osmosis system.

Description

technical field [0001] The present invention relates to a crotonic acid-acrolein-hydroxypropyl acrylate copolymer and a preparation method thereof. At the same time, the present invention also relates to a reverse osmosis membrane protective agent containing the copolymer and its application, specifically to a A water treatment chemical reagent used in reverse osmosis systems to prevent reverse osmosis membranes from being fouled and blocked due to the enrichment and scaling of salt in water, and to control scale pollution of reverse osmosis membranes. Background technique [0002] In the reverse osmosis system, the content of iron ions and aluminum ions in the feed water needs to be strictly controlled, especially for reverse osmosis systems that use reclaimed water as the water source. Since a certain amount of iron salt or aluminum salt is added during the reclaimed water treatment process (as a flocculation agent) to reduce water turbidity. Therefore, some iron ions and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/26B01D61/02B01D69/00
Inventor 董志强
Owner 北京博泰盛合科技有限公司
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