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A corrosion and scale inhibitor for reverse osmosis membrane

A corrosion and scale inhibitor, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, membrane technology, etc. Low price, low environmental pollution, and anti-corrosion effect

Active Publication Date: 2021-10-22
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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  • A corrosion and scale inhibitor for reverse osmosis membrane
  • A corrosion and scale inhibitor for reverse osmosis membrane
  • A corrosion and scale inhibitor for reverse osmosis membrane

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 includes component A and component B, which are compounded according to the mass ratio (1-5):1. According to mass percentage, the composition of the A component is: 25-40% of hydrolyzed polymaleic anhydride, 20-30% of S-carboxyethyl sulfosuccinic acid, 20-30% of polyaspartic acid, alkyl epoxy carboxyl 15-25% of sodium phosphate; the B component is composed of 30-40% of zinc chloride, 15-30% of amino acid, 20-30% of sodium gluconate, and 15-25% of benzotriazole. The corrosion and scale inhibitor provided by the invention can timely adjust the component distribution ratio according to actual working conditions, and is flexible and convenient to use. At the same time, the composite formula provided by the present invention does not contain heavy metals, inorganic phosphates, and organic phosphonates, and is a green and environmentally friendly corrosion and scale inhibitor, and has a good synergistic effect among the components, and has excellent corrosion and scale inhibition performance , the effect is better 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 Patents(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