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Soft water cyclic heating/cooling system corrosion inhibitor and preparation method thereof

A cooling system, water circulation technology, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., can solve problems such as high cost, hindering wide-scale application, and inability to solve carbon steel corrosion problems. , to reduce the processing cost, reduce the risk of eutrophication, and improve the reuse rate

Active Publication Date: 2020-04-17
SHANGHAI CEO ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These types of corrosion inhibitors can inhibit the corrosion of metals in oilfield reinjection water and open circulating cooling water systems to a certain extent, but they cannot solve the corrosion problem of carbon steel equipment in soft water closed circulating cooling / heating systems, and at the same time , the cost of this type of phosphorus-free corrosion inhibitor is relatively high compared with traditional organic phosphine corrosion inhibitors, which further hinders its wide-scale application in actual production

Method used

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  • Soft water cyclic heating/cooling system corrosion inhibitor and preparation method thereof
  • Soft water cyclic heating/cooling system corrosion inhibitor and preparation method thereof
  • Soft water cyclic heating/cooling system corrosion inhibitor and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of hyperbranched macromolecules with isothiourea group and carboxyl functionalized pentapentanol core:

[0034] At room temperature, 15.20g (0.10mol) xylitol (1,2,3,4,5-pentapentyl alcohol), 67.00g (0.50mol) 2,2-dimethylolpropionic acid, 1.00g Add p-toluenesulfonic acid into four-necked round-bottomed flasks equipped with stirring, reflux condenser and thermometer respectively, mix and stir evenly. Nitrogen was blown, and the temperature was raised to 145°C. After reacting for 3 hours, and then reacting for 4 hours under reduced pressure, a viscous substance was obtained. Then cool down to 80°C, add 100g of glacial acetic acid to dissolve, then add 196.00g of maleic anhydride in acetic acid solution (maleic anhydride 1.00mol, mass concentration 50%), and react for 4h. Then the temperature was lowered to 55° C., and 152.00 g of thiourea in acetic acid (1.00 mol of thiourea, 50% mass concentration) was added to react for 5 hours. After cooling to room temper...

Embodiment 2

[0040] Preparation of hyperbranched macromolecules with pentapentanol core functionalized with isothiourea groups and carboxyl groups

[0041] At room temperature, 15.20g (0.10mol) DL-arabitol (1,2,3,4,5-pentapentyl alcohol), 67.00g (0.50mol) 2,2-dimethylolpropionic acid, Add 1.00 g of p-toluenesulfonic acid to a four-neck round bottom flask equipped with stirring, reflux condenser and thermometer, and mix and stir evenly. Nitrogen was blown, the temperature was raised to 140° C., and after reacting for 5 hours, the reaction was continued for 5 hours under reduced pressure to obtain a viscous substance. Then cool down to 80°C, add 100g of glacial acetic acid to dissolve, then add 197.96g (1.01mol, 50%) maleic anhydride in acetic acid solution, and react for 4h. Then the temperature was lowered to 55° C., and 155.04 g (1.02 mol, 50%) of thiourea in acetic acid was added to react for 5 h. After cooling to room temperature, a white substance was precipitated, filtered with suct...

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Abstract

The invention provides a soft water cyclic heating / cooling system corrosion inhibitor. The corrosion inhibitor is an isothiourea-based and carboxyl-based functional pentitol core hyperbranched macromolecule, and the chemical formula of the corrosion inhibitor is C5H7O5{COC(CH3)[CH2OCOCH2CH(COOH)SC(NH)NH2]2}5. The corrosion inhibitor has the characteristics of being free of phosphorus, biodegradable, free of toxins, low in cost and good in corrosion inhibition effect and has excellent corrosion inhibition performance for equipment of a cyclic heating / cooling system with soft water as water, andthe recycling rate of circulating water can be remarkably increased. The invention further provides a preparation method of the corrosion inhibitor. The process is simple, raw materials are easy to obtain, and industrialization is easy.

Description

technical field [0001] The invention relates to the field of industrial water treatment systems and chemical technology, in particular to a corrosion inhibitor for a soft water circulation heating / cooling system and a preparation method thereof. Background technique [0002] In the industrial field, cooling water and heating (or heat preservation) water are often recycled and operated at a high concentration ratio to achieve the purpose of saving water. However, with the increase of the concentration ratio, scaling (calcium carbonate, calcium sulfate, barium sulfate, etc.) will inevitably become more and more serious. Water targets are elusive. Therefore, the use of demineralized water without calcium ions as the water quality and supplementary water of the circulating water system is one of the important measures to save circulating water in recent years. [0003] In some industries, due to the special cooling device or the high temperature of the medium, it is often nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/16C07C335/32C02F5/12
CPCC23F11/161C07C335/32C02F5/12C02F2303/08C02F2103/023C23F11/16C09K15/28
Inventor 张冰如卢宇飞李风亭许太明李春江
Owner SHANGHAI CEO ENVIRONMENTAL PROTECTION TECH CO LTD
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