阅读说明：本技术 一种dtro膜阻垢剂及其制备方法 (DTRO membrane scale inhibitor and preparation method thereof ) 是由 石宗武 吴春丽 于 2020-07-03 设计创作，主要内容包括：本发明公开了一种DTRO膜阻垢剂的制备方法,其包括如下步骤：(1)在聚环氧琥珀酰亚胺中加入黄腐酸和亚氨基琥珀酸四钠,再加入水,在25～45℃和pH值为8～9的条件下反应；(2)步骤(1)的反应完成后,加入水、烯丙基磺酸钠和过硫酸铵,搅拌均匀,在50～55℃下反应；(3)步骤(2)的反应完成后,调节体系的pH值至4.5～5.0；(4)然后加入水、黄腐酸和/或单宁酸,以及TX-30乳化剂,控制温度在38～40℃,分散均匀,即得所述DTRO膜阻垢剂。本发明的阻垢剂能够与阳离子络合形成不易沉积的能够漂浮于水中的物质,并具有软化膜垢的作用,使膜垢软化后易于被清洗去除。此外,本发明的阻垢剂遇到聚电解质和多价阳离子时,不易发生沉淀反应,适用于DTRO膜的除垢。(The invention discloses a preparation method of a DTRO membrane scale inhibitor, which comprises the following steps: (1) adding fulvic acid and tetrasodium iminosuccinate into polyepoxysuccinimide, adding water, and reacting at 25-45 ℃ and at a pH value of 8-9; (2) after the reaction in the step (1) is finished, adding water, sodium allylsulfonate and ammonium persulfate, uniformly stirring, and reacting at 50-55 ℃; (3) after the reaction in the step (2) is finished, adjusting the pH value of the system to 4.5-5.0; (4) and then adding water, fulvic acid and/or tannic acid and a TX-30 emulsifier, controlling the temperature to be 38-40 ℃, and uniformly dispersing to obtain the DTRO membrane scale inhibitor. The scale inhibitor can be complexed with cations to form a substance which is difficult to deposit and can float in water, and has the function of softening membrane scale, so that the membrane scale is easy to clean and remove after being softened. In addition, when the scale inhibitor meets polyelectrolyte and multivalent cations, the scale inhibitor is not easy to generate precipitation reaction and is suitable for removing scale of the DTRO membrane.)

1. A preparation method of a DTRO membrane scale inhibitor is characterized by comprising the following steps:

(1) adding fulvic acid and tetrasodium iminosuccinate into polyepoxysuccinimide, adding water, and reacting at 25-45 ℃ and at a pH value of 8-9;

(2) after the reaction in the step (1) is finished, adding water, sodium allylsulfonate and ammonium persulfate, uniformly stirring, and reacting at 50-55 ℃;

(3) after the reaction in the step (2) is finished, adjusting the pH value of the system to 4.5-5.0;

(4) and then adding water, fulvic acid and/or tannic acid and a TX-30 emulsifier, controlling the temperature to be 38-40 ℃, and uniformly dispersing to obtain the reddish-brown opaque DTRO membrane scale inhibitor.

2. The method for preparing the DTRO membrane scale inhibitor according to claim 1, wherein in the step (1), the addition amount of polyepoxysuccinimide is 15 to 21g, the addition amount of fulvic acid is 13 to 14g, the addition amount of tetrasodium iminosuccinate is 6 to 7g, and the addition amount of water is 50 mL.

3. The preparation method of the DTRO membrane scale inhibitor as claimed in claim 1, wherein in the step (1), sodium hydroxide and sodium carbonate are adopted to adjust the pH value of the system to 8-9.

4. The method for preparing the DTRO membrane scale inhibitor according to claim 3, wherein the mass ratio of the sodium hydroxide to the sodium carbonate is 2: 3.

5. The preparation method of the DTRO membrane scale inhibitor as claimed in claim 1, wherein in the step (2), the addition amount of water is 30mL, the addition amount of sodium allylsulfonate is 9-11 g, and the addition amount of ammonium persulfate is 0.02 g.

6. The method for preparing the DTRO membrane scale inhibitor of claim 5, wherein in the step (2), the reaction time is 75-80 min.

7. The preparation method of the DTRO membrane scale inhibitor as claimed in claim 1, wherein in the step (3), salicylic acid is used to adjust the pH value of the system to 4.5-5.0.

8. The method for preparing the DTRO membrane scale inhibitor as claimed in claim 1, wherein in the step (4), the addition amount of water is 30mL, the addition amount of fulvic acid is 8-10 g or the addition amount of tannic acid is 5-9 g, and the addition amount of TX-30 emulsifier is 6.7-7.5 g.

9. The method for preparing the DTRO membrane scale inhibitor according to claim 1, wherein in the step (4), the method for uniformly dispersing comprises: stirring and then carrying out ultrasonic treatment.

10. A DTRO membrane scale inhibitor, which is characterized by being prepared by the preparation method of the DTRO membrane scale inhibitor as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to a scale inhibitor, in particular to a DTRO membrane scale inhibitor and a preparation method thereof.

Background

The DTRO membrane (disc-tube reverse osmosis membrane) is a form of reverse osmosis, and its core technology is a disc-tube membrane column. The DTRO membrane module has a special liquid mechanical design, so that the DTRO membrane module is suitable for treating wastewater with high turbidity and high sand content coefficient, the SDI value of the wastewater entering the membrane module can reach 20, and the sand content coefficient can also reach 40. The DTRO membrane module has high stable interception efficiency, so the system has strong adaptability to the inflow water quality of the percolate, can normally operate even if BOD5 is greater than 40000mg/L, COD is greater than 62000mg/L, SS is greater than 4000mg/L and ammonia nitrogen is greater than 4000mg/L, and is commonly used for a garbage percolate system.

The hardness of the inlet water of the DTRO membrane component is high, the organic matters are more, and metal salts are easy to form crystals to cause scale deposition. However, studies on cleaning agents, scale inhibitors, and the like of DTRO have been few.

Disclosure of Invention

Based on the above, in order to solve the disadvantages and shortcomings of the prior art, the present invention aims to provide a DTRO membrane scale inhibitor and a preparation method thereof. The scale inhibitor can be used as a modifier for the growth of metal salt scale and a dispersant for growing crystal nuclei, can cause the deformation of crystals, prevents the growth of the crystals, and makes the crystals difficult to adhere to the membrane and the wall of the DTRO membrane component. In addition, the scale inhibitor can be effectively complexed with metal ions, is not easy to generate precipitation, and has a certain binding effect on anions.

In order to realize the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of a DTRO membrane scale inhibitor comprises the following steps:

(1) adding fulvic acid and tetrasodium iminosuccinate into polyepoxysuccinimide, adding water, and reacting at 25-45 ℃ and at a pH value of 8-9;

(2) after the reaction in the step (1) is finished, adding water, sodium allylsulfonate and ammonium persulfate, uniformly stirring, and reacting at 50-55 ℃;

(3) after the reaction in the step (2) is finished, adjusting the pH value of the system to 4.5-5.0;

(4) and then adding water, fulvic acid and/or tannic acid and a TX-30 emulsifier, controlling the temperature to be 38-40 ℃, and uniformly dispersing to obtain the reddish-brown opaque DTRO membrane scale inhibitor.

Preferably, in the step (1), the addition amount of the polyepoxysuccinimide is 15-21 g, the addition amount of the fulvic acid is 13-14 g, the addition amount of the tetrasodium iminosuccinate is 6-7 g, and the addition amount of water is 50 mL.

Preferably, in the step (1), sodium hydroxide and sodium carbonate are adopted to adjust the pH value of the system to 8-9. Preferably, the mass ratio of sodium hydroxide to sodium carbonate is 2: 3. The sodium carbonate has certain corrosion inhibition, and the sodium hydroxide and the sodium carbonate in the ratio are used for adjusting the pH value of a system, so that a product with better scale inhibition effect can be obtained. Otherwise, the scale inhibition rate of the product is reduced when the ratio of the two is too large or too small or when only sodium hydroxide is used.

Preferably, in the step (2), the addition amount of water is 30mL, the addition amount of sodium allylsulfonate is 9-11 g, and the addition amount of ammonium persulfate is 0.02 g.

Preferably, in the step (2), the reaction time is 75-80 min.

Preferably, in the step (3), salicylic acid is adopted to adjust the pH value of the system to 4.5-5.0.

Preferably, in the step (4), the addition amount of water is 30mL, the addition amount of fulvic acid is 8-10 g or the addition amount of tannic acid is 5-9 g, and the addition amount of TX-30 emulsifier is 6.7-7.5 g.

Preferably, in the step (4), the method for uniformly dispersing is as follows: stirring and then carrying out ultrasonic treatment. The method can uniformly disperse the TX-30 emulsifier into the solution to form stable dispersion liquid.

Polyepoxysuccinimide (PESI) is a product of introducing an imide gene into the molecular structure of polyepoxysuccinic acid, and can be prepared synthetically by an existing method or can be obtained commercially.

In the step (1), the fulvic acid and tetrasodium iminosuccinate are added to perform a polymerization reaction with the Polyepoxysuccinimide (PESI), so that a blending modification effect can be achieved, the scale inhibition performance of the PESI can be obviously improved by adding the fulvic acid and the tetrasodium iminosuccinate, and a synergistic effect is obvious. In addition, the tetrasodium iminosuccinate has strong complexing power to metal ions, and no ammonia gas overflows in the reaction process with sodium hydroxide and sodium carbonate. In addition, the pH value of the system is controlled to be 8-9, so that the fulvic acid and tetrasodium iminosuccinate can be well polymerized with polyepoxysuccinimide, otherwise, the effect of the polymerization reaction can be influenced, and the scale inhibition rate of the product is reduced.

In the steps (3) and (4) of the invention, polyhydroxy and carboxyl are added by adding salicylic acid, fulvic acid and tannic acid, so that the solubility and scale inhibition performance of the scale inhibitor can be improved. In the step (4), the addition of the fulvic acid can also play a role in scale inhibition and dispersion.

In the step (4) of the invention, the addition of the TX-30 emulsifier increases the stability of the product. Meanwhile, the inventor discovers through experiments that the scale inhibition performance of the scale inhibitor can be enhanced by adding the TX-30 emulsifier, so that the scale inhibitor has anti-redeposition performance, and the generated scale is not easy to deposit and is easy to disperse.

The polymerized sodium allylsulfonate also has certain anti-redeposition performance, and the scale inhibitor of the invention contains carboxyl, hydroxyl and other groups with negative charges, so that the adsorption performance of the polymer and TX-30 is improved, therefore, when the wastewater is concentrated and ions are deposited due to balance being broken, the scale inhibitor can suspend the generated deposited particles in the solution, and the scale cannot be deposited on the wall or the film, and the scale inhibition performance is further enhanced.

Has the advantages that: the scale inhibitor can be complexed with cations to form a substance which is not easy to deposit and can float in water. Meanwhile, the scale inhibitor has the function of softening membrane scale, so that the membrane scale is easy to clean and remove after being softened. In addition, when the scale inhibitor meets polyelectrolyte and multivalent cations, the scale inhibitor is not easy to generate precipitation reaction and is suitable for removing scale of the DTRO membrane.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention is further illustrated by the following examples. It is apparent that the following examples are only a part of the embodiments of the present invention, and not all of them. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention. The raw materials used in the examples of the present invention are all commercially available unless otherwise specified.