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Green environment-friendly corrosion and scale inhibiting dispersant and its preparation method

A corrosion and scale inhibition, green and environmental protection technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the poor effect of calcium sulfate scale inhibition, calcium phosphate scale and iron oxide Problems such as poor particle inhibition and dispersion, poor calcium phosphate resistance, etc., to achieve the effect of green and environment-friendly preparation process, good biodegradability, and simple and convenient operation

Active Publication Date: 2013-06-05
JIANGSU JIANGHAI CHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the water treatment agents that have been researched more and have better scale and corrosion inhibition effects are mostly phosphates, such as hydroxyethylidene diphosphonic acid (HEDP), aminotrimethylene phosphonic acid (AMP) and 2-butane phosphonate- 1,2,4-tricarboxylic acid (PBTC), etc., although this type of water treatment agent has excellent performance in inhibiting calcium carbonate deposition and good corrosion inhibition performance, but because phosphorus can act as nutrients for bacteria and algae in water, It is easy to cause eutrophication of water sources and cause water pollution; secondly, HEDP, PBTC, etc. have a small relative molecular mass (<600) and fewer functional groups, so they have poor inhibition and dispersion of calcium phosphate scale and iron oxide particles. The stability to zinc salt is poor, and it is easy to form organic calcium phosphate and organic iron phosphate which are insoluble in water in the water quality containing high calcium and high iron, which affects its application
Another type of water treatment agent that has been studied more is phosphorus-free carboxylic acid water treatment agent, such as polyacrylic acid (PAA), polyepoxysuccinic acid (PESA), etc., although US patents 5,062,962 and 5,147,555 show that PESA is effective on CaCO 3 and CaSO4 have good scale inhibition effect, but the effect of calcium phosphate inhibition is poor, and the ability to disperse iron is poor. In addition, the corrosion inhibition performance of this kind of water treatment agent generally
American Betz company launched a new generation of sulfonate copolymer AA-APES (acrylic acid-allyloxypolyethoxysulfate copolymer) in 2003, blocking Ca 3 (PO 4 ) 2 The efficiency of AA-APES is significantly improved, and AA-APES has a higher tolerance to water hardness, suspended solids, and temperature. It is the latest generation of Ca 3 (PO 4 ) 2 Phosphorus-free water treatment agent for scale, but APES still contains nitrogen elements that cause eutrophication of water sources and the effect of inhibiting calcium sulfate scale is poor

Method used

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  • Green environment-friendly corrosion and scale inhibiting dispersant and its preparation method
  • Green environment-friendly corrosion and scale inhibiting dispersant and its preparation method

Examples

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Effect test

example 1

[0017] Example 1: at N 2 Add 100g of allyl polyethylene glycol monoether to the protected reaction kettle, add 100g of maleic anhydride and react at 60°C for 2.5h to obtain a polyether carboxylic acid reaction monomer; add 100g of water, mix well and adjust the temperature to At 70°C, add 12g of sodium persulfate (dissolved in 50g of water) dropwise. After 2 hours of dropwise addition, raise the temperature to 80°C and continue the reaction for 3 hours. APEYY).

[0018] When the dosage of the obtained APEYY is 8mg / L, the Ca 3 (PO 4 ) 2 Scale inhibition rate can reach 99.3%, for CaCO 3 Scale inhibition rate is 97.1%, for CaSO 4 The scale inhibition rate is 96.5%, the light transmittance of the Fe(III) solution which characterizes the performance of dispersing iron is 14.9%, and the corrosion inhibition rate for carbon steel can reach 93.7%.

example 2

[0019] Example 2: at N 2 Add 150g of allyl polyethylene glycol monoether and 120g of maleic anhydride to the protected reactor to react for 3 hours at 70°C to obtain a polyether carboxylic acid reaction monomer; add 150g of water, mix well and adjust the temperature to 75°C ℃, then dropwise add 12g of potassium persulfate (6g) and sodium persulfate (6g) mixture (dissolved in 50g of water), after the dropwise addition, raise the temperature to 90°C, continue the reaction for 5h, and after cooling down to room temperature, obtained Green and environment-friendly polyether corrosion and scale inhibitor dispersant (APEYY).

[0020] When the obtained APEYY dosage is 8mg / L, to Ca 3 (PO 4 ) 2 Scale inhibition rate up to 99.7%, for CaCO 3 Scale inhibition rate is 91.5%, for CaSO 4 The scale inhibition rate is 94.3%. , The light transmittance of Fe(III) solution, which characterizes the performance of dispersing iron, is 16.1%, and the corrosion inhibition rate of carbon steel ca...

example 3

[0021] Example 3: at N 2 Add 120g of allyl polyethylene glycol monoether and 130g of maleic anhydride to the protected reactor to react at 100°C for 2 hours, add 180g of water, adjust the temperature to 80°C after mixing, and then dropwise add 10g of sodium persulfate ( dissolved in 60g water), after the dropwise addition, the temperature was raised to 95°C, and the reaction was continued for 2 hours, and after cooling down to room temperature, a green and environment-friendly polyether corrosion and scale inhibitor dispersant (APEYY) was prepared.

[0022] When the obtained APEYY dosage is 8mg / L, to Ca 3 (PO 4 ) 2Scale inhibition rate up to 96.5%, for CaCO 3 Scale inhibition rate is 90.7%, for CaSO 4 The scale inhibition rate is 92.7%, the light transmittance of Fe(III) solution, which characterizes the performance of dispersing iron, is 16.2%, and the corrosion inhibition rate of carbon steel can reach 94.9%.

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Abstract

The invention relates to a green environment-friendly corrosion and scale inhibiting dispersant (APEYY), which is prepared by free radical self-polymerization of a polyether carboxylic acid reaction monomer. The structural general formula of the dispersant is shown as the following, wherein, the polymerization degree x is 5-5000, the polymerization degree y is 5-5000, and the repeating unit number n is 1-100.

Description

technical field [0001] The invention relates to a green and environment-friendly polyether corrosion and scale inhibitor dispersant (APEYY) and a preparation method thereof, which is a phosphorus-free, nitrogen-free and biodegradable water treatment agent suitable for industrial circulating cooling water systems. The invention relates to the dispersion treatment of corrosion and scale inhibition for water quality, and belongs to the preparation technology of corrosion and scale inhibition dispersant in the technical field of water treatment. Background technique [0002] With the increasing attention of human beings to the living environment and the increasingly stringent environmental protection regulations, people pay more and more attention to green and environmentally friendly water treatment agents. Especially in the 21st century, the development direction of world chemistry and chemical engineering has undergone major revolutionary changes. , whose symbol is the concep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/10
Inventor 周钰明刘广卿黄镜怡姚淸照张培新凌磊钟小丰符嫦娥吴文导孙伟
Owner JIANGSU JIANGHAI CHEM
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