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Phosphate-free polyether scale inhibitor and preparation method thereof

A technology of antiscalant and polyether, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve secondary pollution, difficult inorganic waste salt, poor scaling performance, etc. problem, to achieve the effect of good compatibility and high inhibitory effect

Active Publication Date: 2010-12-01
JIANGSU JIANGHAI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent 5,062,962 and U.S. Patent 5,147,555 show that polyepoxysuccinic acid is effective on CaCO 3 , CaSO 4 , BaSO 4 It has good scale and corrosion inhibition effect, but the scale inhibition effect on calcium phosphate is very poor. When used in combination with organic phosphine corrosion and scale inhibitors, it increases the risk of calcium phosphate scale deposition sex
The scale inhibitor involved in Chinese patent 200610056952.0 contains amide groups, carboxyl groups, etc., which make it have excellent CaSO 4 Scaling performance, as well as the performance of dispersing iron oxide to a certain extent, and has a good timeliness, but its effect on Ca inhibition 3 (PO 4 ) 2 Poor scale performance
Chinese patent CN101172720 discloses a phosphorus-free allyloxypolyether carboxylic acid scale inhibitor and its preparation method, but the scale inhibitor preparation process will produce a large amount of inorganic waste salt that is difficult to handle, which will easily cause secondary pollution To increase its industrial application cost, the present invention adopts the green reaction process of lactone one-step esterification to prepare polyether reaction monomer, and then prepares an excellent Ca-barrier 3 (PO 4 ) 2 Phosphorus-free and biodegradable phosphorus-free polyether antiscalant

Method used

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  • Phosphate-free polyether scale inhibitor and preparation method thereof
  • Phosphate-free polyether scale inhibitor and preparation method thereof
  • Phosphate-free polyether scale inhibitor and preparation method thereof

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Effect test

preparation example Construction

[0024] The preparation method of phosphorus-free polyether scale inhibitor of the present invention is:

[0025] Based on the quality of allyl polyethylene glycol monoether, add allyl polyethylene glycol monoether and solid inorganic base 0.5 to 2 times the mass of allyl polyethylene glycol monoether into the reaction kettle, 2 Under atmosphere, after basification at 20-120°C for 1-5 hours, add lactone with 0.5-2 times the mass of allyl polyethylene glycol monoether, and react at 30-150°C for 2-8 hours; adjust and control the temperature at 50°C- After 95°C, add 0.2 to 5 times the mass of allyl polyethylene glycol monoether and distilled water with 0.1 to 5 times the mass of allyl polyethylene glycol monoether, and mix well Add dropwise an inorganic initiator aqueous solution with a concentration of 5% to 60% by mass. The amount of the inorganic initiator added is 0.01 to 0.5 times the mass of allyl polyethylene glycol monoether, and the dripping is completed in 0.5 to 5 hours...

example 1

[0026] Example 1: Add 100g allyl polyethylene glycol monoether and 80g NaOH to an N2-protected reaction kettle, after alkalinizing at 50°C for 2h, add 120gγ-butyrolactone and react at 80°C for 6h, add 150g distilled water, and simultaneously 80g of maleic anhydride (dissolved in 150g of distilled water) and 6g of sodium persulfate (dissolved in 50g of distilled water) were added dropwise, and after the addition was completed, the reaction was continued at 80°C for 3h, and after cooling down to room temperature, a phosphorus-free polyether barrier was obtained. Detergent (APEX).

[0027] The Ca of the obtained APEX antiscalant 3 (PO 4 ) 2 The rate is 99.87%.

example 2

[0028] Example 2: Add 150g of allyl polyethylene glycol monoether and 140g of NaOH to a reaction kettle protected by N2, after alkalization at 60°C for 3h, add 160g of gamma-nonalactone and react at 60°C for 8h, add 200g of distilled water, At the same time, 60g of methacrylic acid (dissolved in 100g of distilled water) and 5g of potassium persulfate (dissolved in 50g of distilled water) were added dropwise respectively. After the addition, the temperature was raised to 90°C, and the reaction was continued for 5h. After cooling down to room temperature, no Phosphopolyether antiscalant (APEX).

[0029] The Ca of the obtained APEX antiscalant 3 (PO 4 ) 2 The rate is 99.24%.

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Abstract

The invention relates to a phosphate-free polyether scale inhibitor (APEX) which is a product of free radical polymerization of a polyether reaction monomer prepared by a lactone process and a monomer which contains a vinyl unsaturated double bond. The scale inhibitor comprises a structural general formula shown in the specification, wherein A is a constitutional repeating unit after the copolymerization of the monomer which contains the vinyl unsaturated double bond; R1 is H or a C1-C5 low-carbon alkyl; a value of P is 2 to 10; M is H<+>, K<+> or Na<+>; the polymerization degree x is 1 to 5,000; the polymerization degree y is 1 to 5,000; and the polymerization degree n is 1 to 100.

Description

technical field [0001] The invention relates to the preparation of a phosphorus-free and biodegradable phosphorus-free polyether scale inhibitor with stable performance, which belongs to the scale inhibitor preparation technology in the technical field of water treatment and is suitable for industrial cooling water circulation systems. Background technique [0002] With the increasing attention of human beings to the living environment and the stricter environmental protection regulations, people pay more and more attention to environmentally friendly water treatment agents. At present, the widespread use of a large number of phosphorus and nitrogen-containing scale inhibitors has caused a large number of bacteria and algae to multiply. , Water eutrophication and other environmental pollution problems, therefore, the development of phosphorus-free water treatment agents has become a development trend. [0003] American Betz Company invented acrylic acid-allyl polyether sulfa...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G65/48C02F5/10
Inventor 周钰明谢洪涛符嫦娥
Owner JIANGSU JIANGHAI CHEM
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