CN109319951B

CN109319951B - Environment-friendly circulating water scale inhibitor

Info

Publication number: CN109319951B
Application number: CN201811439026.0A
Authority: CN
Inventors: 陈敏; 薛冕; 徐会武; 黄长山; 吴晋英; 张敏; 程玉山
Original assignee: Energy Research Institute Co Ltd of Henan Academy of Sciences
Current assignee: Energy Research Institute Co Ltd of Henan Academy of Sciences
Priority date: 2018-11-29
Filing date: 2018-11-29
Publication date: 2021-06-04
Anticipated expiration: 2038-11-29
Also published as: CN109319951A

Abstract

The invention belongs to the technical field of water treatment and discloses an environment-friendly circulating water scale inhibitor. The composite material is prepared from the following raw materials in parts by mass: benzotriazole, sodium polyacrylate, polymaleic anhydride, hydroxyethylidene diphosphonic acid, diethylenetriamine pentamethylene phosphoric acid, 2-phosphoric acid butane-1, 2, 4-tricarboxylic acid, polyepoxy succinic anhydride, polyaspartic acid, cross-linked carboxymethyl chitosan and sodium lignosulfonate. The invention has wide source of raw materials, economic and practical price and simple production process, can meet the configuration requirement at normal temperature, and is very suitable for being used in the circulating water of a central air-conditioning system. Has very high scale inhibition rate which can reach 96.2-99.8 percent, low corrosion rate and low cost, is also suitable for high temperature state, and can be widely popularized and applied.

Description

Environment-friendly circulating water scale inhibitor

Technical Field

The invention relates to a circulating water scale inhibitor and a preparation method thereof, which are particularly suitable for preparing the circulating water scale inhibitor of a central air conditioner and belong to the technical field of water treatment.

Background

In order to prevent the scale formation and corrosion of the circulating water of large, medium and small central air conditioners, a chemical treatment method in a pipeline is usually adopted, an anticorrosion scale inhibitor is added into the water for the central air conditioners, the hardness of the circulating water is reduced, the water quality is softened, and the scale formation and corrosion are reduced.

Currently, the environmental protection, high efficiency and multiple functions of water treatment scale inhibitor products become the development direction of scale inhibitor products. In the 60 s of the 20 th century, organic phosphoric acid is widely applied to the domestic circulating water treatment field, such as the industries of electric power, chemical industry, food, metallurgy and the like, due to good thermal stability, hydrolysis resistance and excellent scale inhibition performance. However, with the improvement of environmental protection requirements, the use of organic phosphorus scale inhibitors in circulating water systems is limited, and particularly strict requirements on the discharge of phosphorus in sewage are met. Therefore, the development and application of the low-phosphorus or phosphorus-free environment-friendly scale inhibitor becomes the direction of research and development at home and abroad.

Disclosure of Invention

The invention aims to provide a circulating water scale inhibitor which is high in scale inhibition rate, non-corrosive, high-temperature-resistant, non-phosphorus and environment-friendly, and is particularly suitable for circulating water of a central air conditioner.

The invention adopts the following technical scheme: the raw materials are as follows according to the mass part ratio in the components: 5-15 parts of benzotriazole, 20-30 parts of sodium polyacrylate, 20-40 parts of polymaleic anhydride, 5-10 parts of hydroxyethylidene diphosphonic acid, 6-8 parts of diethylenetriamine pentamethylene phosphoric acid, 10-15 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 6-8.2 parts of polyepoxysuccinic anhydride, 10-20 parts of polyaspartic acid, 50-70 parts of cross-linked carboxymethyl chitosan and 7-15 parts of sodium lignosulphonate.

As a preferred technical scheme of the invention: the raw materials comprise the following components in parts by weight: 5 parts of benzotriazole, 25 parts of sodium polyacrylate, 20 parts of polymaleic anhydride, 7 parts of hydroxyethylidene diphosphonic acid, 8 parts of diethylenetriamine pentamethylene phosphoric acid, 15 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 7.3 parts of polyepoxysuccinic anhydride, 15 parts of polyaspartic acid, 53 parts of cross-linked carboxymethyl chitosan and 8 parts of sodium lignosulfonate.

As a preferred technical scheme of the invention: the raw materials comprise the following components in parts by weight: 15 parts of benzotriazole, 30 parts of sodium polyacrylate, 25 parts of polymaleic anhydride, 5 parts of hydroxyethylidene diphosphonic acid, 6 parts of diethylenetriamine pentamethylene phosphoric acid, 10 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 8.2 parts of polyepoxysuccinic anhydride, 10 parts of polyaspartic acid, 70 parts of cross-linked carboxymethyl chitosan and 10 parts of sodium lignosulfonate.

As a preferred technical scheme of the invention: the raw materials comprise the following components in parts by weight: 8 parts of benzotriazole, 20 parts of sodium polyacrylate, 40 parts of polymaleic anhydride, 10 parts of hydroxyethylidene diphosphonic acid, 7.5 parts of diethylenetriamine pentamethylene phosphoric acid, 14 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 6 parts of polyepoxysuccinic anhydride, 12 parts of polyaspartic acid, 60 parts of cross-linked carboxymethyl chitosan and 7 parts of sodium lignosulfonate.

The preparation method of the environment-friendly scale inhibitor comprises the following steps:

the first step is as follows: weighing sodium polyacrylate, polymaleic anhydride, hydroxyethylidene diphosphate, 2-butane phosphate-1, 2, 4-tricarboxylic acid and polyaspartic acid according to the proportion, putting into a reaction kettle with a thermometer, a heating device and a stirring device, adding water, and stirring uniformly;

the second step is that: adding benzotriazole, crosslinked carboxymethyl chitosan and sodium lignosulphonate, stirring and reacting at 80-95 ℃;

the third step: cooling to room temperature, adding diethylenetriamine pentamethylene phosphoric acid and polyepoxy succinic anhydride, and stirring for reaction to obtain the target product.

Compared with the prior art, the environment-friendly scale inhibitor has the following technical effects: the invention has wide raw material source, economic and practical price and simple production process, can meet the configuration requirement at normal temperature, is used for an open type circulating cooling water treatment system, is particularly suitable for a system containing copper equipment, and is particularly suitable for being used in circulating water of a central air-conditioning system. Has very high scale inhibition rate, usually reaching 96.2-99.8%, low corrosion rate and high temperature state. The water treatment agent has low cost, can be used for water with high pH value, high alkalinity and high hardness, and is one of ideal water treatment agents which do not adjust pH value and operate in alkalinity at present. The manufacturing process is simple, and the method can be widely popularized and applied.

Detailed Description

The following is a more detailed description of embodiments of the invention:

example 1:

the first step is as follows: weighing 25 parts of sodium polyacrylate, 20 parts of polymaleic anhydride, 7 parts of hydroxyethylidene diphosphate, 15 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid and 15 parts of polyaspartic acid, putting into a reaction kettle with a thermometer, a heating device and a stirring device, adding water, and uniformly stirring;

the second step is that: adding 5 parts of benzotriazole, 53 parts of crosslinked carboxymethyl chitosan and 8 parts of sodium lignosulfonate, and stirring at 80 ℃ for 30min at a stirring speed of 65 r/min;

the third step: and cooling to room temperature, adding 8 parts of diethylenetriamine pentamethylene phosphoric acid and 7.3 parts of polyepoxy succinic anhydride, and stirring for 1 hour.

When the scale inhibitor is used for water treatment of a hot water boiler, the scale inhibition rate is high, and the corrosion rate is low; high temperature resistance, can greatly prolong the service life of the boiler, and has the scale inhibition rate of calcium carbonate of 96.2 percent.

Example 2:

the first step is as follows: weighing 30 parts of sodium polyacrylate, 25 parts of polymaleic anhydride, 5 parts of hydroxyethylidene diphosphate, 10 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid and 10 parts of polyaspartic acid, putting into a reaction kettle with a thermometer, a heating device and a stirring device, adding water, and uniformly stirring;

the second step is that: adding 15 parts of benzotriazole, 70 parts of crosslinked carboxymethyl chitosan and 10 parts of sodium lignosulphonate, and stirring at 85 ℃ for 40min at the stirring speed of 60 r/min;

the third step: cooling to room temperature, adding 6 parts of diethylenetriamine pentamethylene phosphoric acid, 8.2 parts of polyepoxy succinic anhydride and the rest raw materials, and stirring for 1.5 h.

The method is used for water treatment of a hot water boiler; the scale inhibition rate is high, and the corrosion rate is low; the high temperature resistance can greatly prolong the service life of the boiler; the scale inhibition rate on calcium carbonate is 98.8 percent.

Example 3:

the first step is as follows: weighing 20 parts of sodium polyacrylate, 40 parts of polymaleic anhydride, 10 parts of hydroxyethylidene diphosphate, 14 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid and 12 parts of polyaspartic acid, putting into a reaction kettle with a thermometer, a heating device and a stirring device, adding water, and uniformly stirring;

the second step is that: adding 8 parts of benzotriazole, 60 parts of crosslinked carboxymethyl chitosan and 7 parts of sodium lignosulfonate into a reaction kettle with a thermometer, a heating device and a stirring device, and stirring at 90 ℃ for 50min at a stirring speed of 80 r/min;

the third step: cooling to room temperature, adding 7.5 parts of diethylenetriamine pentamethylene phosphoric acid, 6 parts of polyepoxy succinic anhydride and the rest raw materials, and stirring for 1.5 h.

The method is used for treating circulating water of the central air conditioner; the scale inhibition rate is high, and the corrosion rate is low; the heat resistance can greatly prolong the service life of the central air conditioner; the scale inhibition rate on calcium carbonate is 99.8 percent.

Example 4:

the first step is as follows: weighing 25 parts of sodium polyacrylate, 30 parts of polymaleic anhydride, 5 parts of hydroxyethylidene diphosphate, 10 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid and 20 parts of polyaspartic acid, putting into a reaction kettle with a thermometer, a heating device and a stirring device, adding water, and uniformly stirring;

the second step is that: adding 15 parts of benzotriazole, 50 parts of crosslinked carboxymethyl chitosan and 15 parts of sodium lignosulfonate into a reaction kettle with a thermometer, a heating device and a stirring device, and stirring at 95 ℃ for 50min at a stirring speed of 80 r/min;

The scale inhibition rate is determined by adopting a bubbling method, wherein the bubbling airflow is 80L/h, the constant temperature in a water bath at 60 ℃ is 6h, the power supply is turned off, and the test solution is cooled to the room temperature. And (3) evaluating the performance of the calcium carbonate by using HG/T2024-2009 Scale inhibition Performance determination method for Water treatment agents.

The list compares with the existing product, and the performance index is as follows:

while the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The circulating water scale inhibitor is characterized by being prepared from the following raw materials in parts by weight:

15 parts of benzotriazole, 25 parts of sodium polyacrylate, 30 parts of polymaleic anhydride, 5 parts of hydroxyethylidene diphosphonic acid, 7.5 parts of diethylenetriamine pentamethylene phosphoric acid, 10 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 6 parts of polyepoxysuccinic anhydride, 20 parts of polyaspartic acid, 50 parts of cross-linked carboxymethyl chitosan and 15 parts of sodium lignosulfonate.

2. The circulating water scale inhibitor is characterized by being prepared from the following raw materials in parts by weight: 8 parts of benzotriazole, 20 parts of sodium polyacrylate, 40 parts of polymaleic anhydride, 10 parts of hydroxyethylidene diphosphonic acid, 7.5 parts of diethylenetriamine pentamethylene phosphoric acid, 14 parts of 2-butane phosphate-1, 2, 4-tricarboxylic acid, 6 parts of polyepoxysuccinic anhydride, 12 parts of polyaspartic acid, 60 parts of cross-linked carboxymethyl chitosan and 7 parts of sodium lignosulfonate.