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Method for synthesizing corrosion and scale inhibitor S-carboxyalkylthiosuccinic acid by adopting one-step method

A technology of carboxyethyl thiosuccinic acid and corrosion and scale inhibitor, which is applied in the field of industrial circulating cooling water treatment to achieve the effects of being easily biodegraded, avoiding environmental pollution and avoiding potential safety hazards

Inactive Publication Date: 2013-03-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The corrosion and scale inhibitor not only overcomes the secondary pollution caused by phosphorus-based corrosion and scale inhibitors, but also has good corrosion and scale inhibition effects on circulating cooling water with high hardness

Method used

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  • Method for synthesizing corrosion and scale inhibitor S-carboxyalkylthiosuccinic acid by adopting one-step method
  • Method for synthesizing corrosion and scale inhibitor S-carboxyalkylthiosuccinic acid by adopting one-step method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 20.00g of maleic anhydride into a three-necked flask equipped with a reflux device, add 76.10g of distilled water, and preheat to 70°C in a constant temperature oil bath to completely dissolve the maleic anhydride; then add to the above-mentioned three-necked flask 18.05g of 3-mercaptopropionic acid, add a magnetic rotor at the same time, set the rotation speed of the oil bath to 500r / min, so that the 3-mercaptopropionic acid and maleic anhydride solution are completely miscible, and then add 0.38g of D101 base The above system is heated to 125°C, heated to reflux for 3.5 hours, suction filtered while it is hot, the filtrate is placed in the refrigerator to cool to about 4°C for recrystallization, suction filtered again, the filtrate is recovered and used mechanically, and the filter cake is collected. The filter cake was placed in a freeze dryer and dried for 48 hours to obtain a white powder which was the product S-carboxyethylthiosuccinic acid. According to th...

Embodiment 2-5

[0027] The difference between Examples 2-5 and Example 1 lies in the amount of raw materials participating in the reaction and the dosage of the synthesized corrosion and scale inhibitor S-carboxyethyl thiosuccinic acid product performance test. The synthetic formulations, finished product yields and corrosion and scale inhibition properties of the five examples are shown in Table 1.

[0028] .

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Abstract

The invention relates to a method for synthesizing a corrosion and scale inhibitor S-carboxyalkylthiosuccinic acid by adopting a one-step method, and belongs to the field of industrial recycling cooling water treatment. The method comprises the following steps of: adding a certain amount of maleic anhydride and distilled water into a flask and preheating the flask in a constant-temperature oil-bathing pan to 70 DEG C till the maleic anhydride is completely dissolved; adding a certain amount of 3-thiohydracrylic acid to the flask so that the 3-thiohydracrylic acid and the maleic anhydride solution are completely mixed and dissolved, and then adding a little amount of D101 alkali resin to the mixed solution; and heating the mixed solution to 125 DEG C, heating and refluxing for 3.5h, carrying out suction filtering while the mixed solution is hot, putting the filtrate into a refrigerator and cooling the filtrate to 4 DEG C to recrystalize, carrying out suction filtering again to obtain filtrate which does not contain volatile substances and can be recycled and reused, collecting filter cakes, putting the filter cakes into a freezer dryer and drying for 48 hours to obtain white powder, namely the corrosion and scale inhibitor. The one-step method synthesis method disclosed by the invention is free of high temperature and high pressure, simple and convenient to operate and capable of effectively avoiding potential safety hazards and environmental pollution in the production process.

Description

technical field [0001] The invention belongs to the field of industrial circulating cooling water treatment, and specifically relates to a method for synthesizing S-carboxyethylthiosuccinic acid, a non-phosphorous corrosion and scale inhibitor, by a "one-step method". [0002] Background technique [0003] With the rapid development of industry, industrial water consumption is increasing day by day, among which circulating cooling water accounts for 70%-90% of industrial water consumption. Most of the current circulating cooling water systems in my country use open circulating cooling water systems. Due to the evaporation of open cooling towers in this circulating cooling water treatment system, the concentration of circulating cooling water increases continuously during this process, and Fe 2+ , Cl － , Ca 2+ , Mg 2+ The plasma concentration keeps rising. If no water treatment agent is added, problems such as corrosion, scaling and microbial slime will occur in the heat ...

Claims

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Application Information

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IPC IPC(8): C07C323/52C07C319/18C02F5/10
Inventor 张文艺占明飞李仁霞郑泽鑫戴如娟
Owner CHANGZHOU UNIV
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