Synthesis method and application of glycolic acid polymer and derivative thereof

A technology of glycolic acid, synthesis method, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc. , to achieve the effect of good anti-scaling effect

Active Publication Date: 2022-05-10
SECOND INST OF OCEANOGRAPHY MNR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The water consumption of the circulating cooling water system usually accounts for more than 70% of the water consumption of thermal power enterprises and iron and steel enterprises. As the concentration ratio of circulating water increases, the concentration of hardness ions, sulfate ions, and phosphate ions in circulating water gradually increases. Scaling will occur on related equipment of the circulating water system, affecting the economical, safe and stable operation of the circulating water system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the present embodiment, a synthetic method of glycolic acid polymer and its derivatives comprises the following steps:

[0027] (1) Weigh 6.12g of glycolic acid (GA) into a beaker containing 40mL of tetrahydrofuran, dissolve under mechanical stirring (200r / min), heat to 50°C in a water bath for 60 minutes;

[0028] (2) Use a pipette gun to add 4 mL of concentrated sulfuric acid dropwise to the tetrahydrofuran solution dissolved in glycolic acid, add 0.2 mL of concentrated sulfuric acid dropwise every 30 seconds, add in 20 times, and add 4 mL of concentrated sulfuric acid in total;

[0029] (3) The tetrahydrofuran solution dissolved in glycolic acid was acidified with sulfuric acid, and stirred and reacted at 50°C for 6 hours;

[0030] (4) Prepare NaOH solution (1mol / L), add it into the chemical reaction mixture under stirring with a dropper, adjust the pH of the mixture to about 6-7, keep stirring and reacting at 50°C for 1 hour, then cool to room temperature (aroun...

Embodiment 2

[0045] In the present embodiment, a synthetic method of glycolic acid polymer and its derivatives comprises the following steps:

[0046] (1) Weigh 7.14g glycolic acid (GA) into a beaker filled with 40mL tetrahydrofuran, dissolve under mechanical stirring (200r / min), heat to 50°C in a water bath for 60 minutes;

[0047] (2) Use a pipette gun to add 4 mL of concentrated sulfuric acid dropwise to the tetrahydrofuran solution dissolved in glycolic acid, add 0.2 mL of concentrated sulfuric acid dropwise every 30 seconds, add in 20 times, and add 4 mL of concentrated sulfuric acid in total;

[0048] (3) The tetrahydrofuran solution dissolved in glycolic acid was acidified with sulfuric acid, and stirred and reacted at 50°C for 6 hours;

[0049] (4) Prepare NaOH solution (1mol / L), add it into the chemical reaction mixture under stirring with a dropper, adjust the pH of the mixture to about 6-7, keep stirring and reacting at 50°C for 1 hour, then cool to room temperature (around 25°...

Embodiment 3

[0061] In the present embodiment, a synthetic method of glycolic acid polymer and its derivatives comprises the following steps:

[0062] (1) Weigh 5.1g of glycolic acid (GA) into a beaker containing 40mL of tetrahydrofuran, dissolve under mechanical stirring (200r / min), heat to 50°C in a water bath for 60 minutes;

[0063] (2) Use a pipette gun to add 4 mL of concentrated sulfuric acid dropwise to the tetrahydrofuran solution dissolved in glycolic acid, add 0.2 mL of concentrated sulfuric acid dropwise every 30 seconds, add in 20 times, and add 4 mL of concentrated sulfuric acid in total;

[0064] (3) The tetrahydrofuran solution dissolved in glycolic acid was acidified with sulfuric acid, and stirred and reacted at 50°C for 6 hours;

[0065] (4) Prepare NaOH solution (1mol / L), add it into the chemical reaction mixture under stirring with a dropper, adjust the pH of the mixture to about 6-7, keep stirring and reacting at 50°C for 1 hour, then cool to room temperature (around...

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Abstract

The invention discloses a synthesis method of a glycolic acid polymer and a derivative thereof, which comprises the following steps: carrying out polymerization reaction on glycolic acid serving as a monomer raw material to generate polymeric glycolic acid, and forming a ternary composite efficient scale inhibitor by taking the polymeric glycolic acid, citric acid and aspartic acid as raw materials; the scale inhibitor can be complexed with calcium ions in circulating water and adsorbed on the surfaces of calcium carbonate, calcium sulfate, calcium phosphate and other crystals, so that the calcium carbonate, calcium sulfate and calcium phosphate crystals are distorted into loose structures and are removed along with water flow, the formation of calcium carbonate, calcium sulfate and calcium phosphate scales is eliminated and inhibited, and the formed calcium carbonate, calcium sulfate and calcium phosphate scales can be removed. The agent is a phosphorus-free agent, so that the total phosphorus of discharged circulating water cannot exceed the standard; the scale inhibitor has a good scale inhibition effect on calcium carbonate, calcium sulfate and calcium phosphate, the running concentration ratio of a circulating water system is remarkably increased to 8 times or above, it is guaranteed that the circulating water system does not scale, and the scale inhibitor has remarkable water-saving and energy-saving effects.

Description

technical field [0001] The invention relates to the development and application of a glycolic acid polymer and its derivatives used for scale inhibition treatment of circulating cooling water in thermal power plants, iron and steel plants, coal chemical industry and other enterprises. Background technique [0002] The water consumption of the circulating cooling water system usually accounts for more than 70% of the water consumption of thermal power enterprises and iron and steel enterprises. As the concentration ratio of circulating water increases, the concentration of hardness ions, sulfate ions, and phosphate ions in circulating water gradually increases. Scaling will occur on related equipment of the circulating water system, affecting the economical, safe and stable operation of the circulating water system. In order to maintain the normal operation of the circulating water system, it is necessary to add scale inhibitors and other chemicals to inhibit the scaling of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/06C08G63/78C02F5/12
CPCC08G63/912C08G63/06C08G63/78C02F5/12
Inventor 李洁晋银佳刘鹏程
Owner SECOND INST OF OCEANOGRAPHY MNR
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