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Corrosion and scale inhibitor for reverse osmosis membranes

A corrosion and scale inhibitor, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, membrane technology and other directions, can solve the problems of low selectivity of corrosion and scale inhibitor, dependence on imports, small pore size, etc. Low cost, less environmental pollution, and anti-corrosion effect

Active Publication Date: 2019-09-06
YINGKOU KELIN MEMBRANE TECH ENG SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used corrosion and scale inhibitors are generally composed of organic phosphine, copolymers, and corrosion inhibitors. Although there are many types, traditional drug design methods rarely involve research on the inhibition mechanism of reverse osmosis. Scale inhibitors have very little selectivity, and the reverse osmosis membrane has the characteristics of small pore size and easy fouling, so it is necessary to select a unique and proprietary corrosion and scale inhibitor formula
This has led to the fact that the current domestic chemicals for reverse osmosis membranes are almost completely dependent on imports, and there is no mature market for corrosion and scale inhibitors for reverse osmosis in China. Therefore, the development of domestically produced corrosion and scale inhibitors for reverse osmosis membranes is Urgent needs of the market

Method used

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  • Corrosion and scale inhibitor for reverse osmosis membranes
  • Corrosion and scale inhibitor for reverse osmosis membranes
  • Corrosion and scale inhibitor for reverse osmosis membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 is used for the corrosion and scale inhibitor of reverse osmosis membrane

[0017] The preparation method comprises the following steps:

[0018] 1. Preparation of S-carboxyethylthiosuccinic acid

[0019] At 70-75°C, dissolve 23.0g (0.24mol) of maleic anhydride in 300mL of distilled water, add 21.2g (0.2mol) of 3-mercaptopropionic acid, adjust the pH of the system to about 5, and add 0.36g of catalyst K 2 CrO 4 , and then the system was heated to 120-125°C, heated to reflux for 2-3.5h, filtered while hot, and the filtrate was cooled to 4°C for recrystallization to obtain white S-carboxyethylthiosuccinic acid.

[0020] 2. Preparation of sodium alkyl epoxy carboxylate

[0021] Dissolve 0.2 mol of lauryl polyoxyethylene ether and 0.21 mol of sodium chloroacetate in 300 mL of absolute ethanol, and after heating up to 55°C, slowly add 0.22 mol of sodium hydroxide into the system, react for 3 to 5 hours, cool, and filter to obtain Sodium Alkyl Epoxy Carboxyla...

Embodiment 2

[0029] Embodiment 2 is used for the corrosion and scale inhibitor of reverse osmosis membrane

[0030] The preparation method comprises the following steps:

[0031] 1, the preparation of S-carboxyethyl thiosuccinic acid: with embodiment 1

[0032] 2, the preparation of sodium alkyl epoxy carboxylate: with embodiment 1

[0033] 3. Preparation of component A

[0034] According to mass percentage, mix 32% hydrolyzed polymaleic anhydride, 28% S-carboxyethyl thiosuccinic acid, 25% polyaspartic acid, 15% sodium alkyl epoxy carboxylate, and mix well to prepare Group A point.

[0035] 4. Preparation of component B

[0036] According to mass percentage, 40% zinc chloride, 15% phenylalanine, 25% sodium gluconate and 20% benzotriazole are uniformly mixed to prepare component B.

[0037] 5. Preparation of corrosion and scale inhibitors

[0038] Mix A component and B component according to the mass ratio of 2:1.

[0039] In actual application, the corrosion and scale inhibitor prep...

Embodiment 3

[0040] Embodiment 3 is used for the corrosion and scale inhibitor of reverse osmosis membrane

[0041] The preparation method comprises the following steps:

[0042] 1, the preparation of S-carboxyethyl thiosuccinic acid: with embodiment 1

[0043] 2, the preparation of sodium alkyl epoxy carboxylate: with embodiment 1

[0044] 3. Preparation of component A

[0045] According to mass percentage, mix 35% hydrolyzed polymaleic anhydride, 25% S-carboxyethyl thiosuccinic acid, 22% polyaspartic acid, 18% sodium alkyl epoxy carboxylate, and mix well to prepare Group A point.

[0046] 4. Preparation of component B

[0047] According to mass percentage, 35% zinc chloride, 15% lysine, 25% sodium gluconate and 25% benzotriazole are uniformly mixed to prepare component B.

[0048] 5. Preparation of corrosion and scale inhibitors

[0049] Mix components A and B in a mass ratio of 3:1.

[0050] In actual application, the corrosion and scale inhibitor prepared in this example can be ...

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Abstract

The invention relates to a corrosion and scale inhibitor for reverse osmosis membranes. The corrosion and scale inhibitor comprises a component A and a component B, and is obtained by compounding thecomponent A with the component B according to a mass ratio of (1-5):1. The component A comprises, by mass, 25-40% of hydrolyzed polymaleic anhydride, 20-30% of S-carboxyethylthiosuccinic acid, 20-30%of polyaspartic acid and 15-25% of sodium alkylepoxy carboxylate; and the component B comprises 30-40% of zinc chloride, 15-30% of amino acids, 20-30% of sodium gluconate and 15-25% of benzotriazole.The corrosion and scale inhibitor can be flexibly and conveniently used by timely adjusting the proportions of the components according to actual working conditions. The above composite formula provided by the invention does not contain heavy metals, inorganic phosphates pr organic phosphonates, so the corrosion and scale inhibitor belongs to a green and environmentally-friendly corrosion and scale inhibitor; and all the components have good synergistic effects, so the corrosion and scale inhibitor has an excellent corrosion and scale inhibition performance, and has a better effect than commonly used corrosion and scale inhibitors.

Description

technical field [0001] The invention belongs to the field of chemical agents, and in particular relates to a corrosion and scale inhibitor used in reverse osmosis membrane water treatment technology. Background technique [0002] Reverse osmosis membrane is an ultra-high-precision membrane separation technology developed in the early 1960s in the United States, using pressure difference as the power. Molecular passage is currently recognized as a high-efficiency, low-consumption, and pollution-free water treatment technology. The reverse osmosis membrane is composed of a polyamide ultra-thin desalination layer, a porous support layer and a polyester non-woven fabric. It is usually used in the reuse of steel and chemical production wastewater, as well as the deep desalination and reuse of industrial wastewater and urban drainage; it can operate at a low High desalination rate can be obtained under pressure; it can also be used in industrial water treatment such as ultrapure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/08B01D61/02
CPCB01D61/025B01D65/08B01D2321/162B01D2321/168
Inventor 许显峰张旭
Owner YINGKOU KELIN MEMBRANE TECH ENG SERVICE