Ammonia trapping agent for near-surface air and preparation method thereof

Abstract

The invention relates to an ammonia catching agent for near-surface air and a preparation method thereof. The ammonia catching agent comprises the following components in parts by mass: 3-10 parts of sodium chloride, 5-15 parts of calcium chloride, 5-10 parts of magnesium chloride, 10-20 parts of calcium magnesium acetate, 0.1-0.5 part of benzotriazole, 5-15 parts of organic sodium salt, 0.2-1 part of inorganic thickening agent, 10-20 parts of polyhydric alcohol and 40-120 parts of water. The ammonia trapping agent can effectively reduce the concentration of ammonia in near-surface air, the reduction rate is 5%-15%, ammonia can be effectively prevented from escaping into the air for the second time, the ammonia can form stable ammonium salt after being adsorbed by the trapping agent, and then the stable ammonium salt enters an underground pipe network sewage collection system after being washed by a sanitation vehicle or rain water. The ammonia trapping agent can play a role in synergic emission reduction of multiple pollutants, and has a certain adsorption effect on PM2.5, PM10 and NOx in near-surface air while controlling ammonia.

Description

Technical Field

[0001] The present invention relates to the field of atmospheric environment treatment, and in particular to an ammonia capture agent for near-surface air and a preparation method thereof. Background Art

[0002] The concentration of ammonia in the atmosphere is affected by many factors, including geographical location, seasonal changes, and human activities. The ammonia concentration in northern China is significantly higher than that in the south of the Yangtze River. The ammonia concentration observed at urban stations is comparable to that at farmland stations, and significantly higher than that at forest, grassland, and mountain stations. The North China Plain is one of the hotspots of ammonia emissions. The hourly mean ammonia concentration can fluctuate greatly in winter, ranging from 0.8 ppb to 483.3 ppb, with an average of about 16.7 ± 19.7 ppb. The ammonia concentration has obvious daily variation characteristics, and usually there is a morning peak phenomenon between 7 and 10 in the morning.

[0003] Motor vehicle ammonia emissions are one of the important sources of the morning peak of urban atmospheric ammonia concentration. According to research findings, the use of nitrogen isotope tracing technology to track the source of atmospheric ammonia found that motor vehicle emissions contribute up to 40% to the morning peak of ammonia. Motor vehicles not only play an important role in the formation of the morning peak of ammonia, but also contribute to PM2.5. 2.5 Therefore, reducing the concentration of ammonia in the near-surface ambient air is one of the key measures to improve urban air quality.

[0004] Currently, research on ammonia absorption mainly focuses on the development of efficient adsorption materials and chemical treatment methods, while there is less research on near-ground ammonia capture technology. Summary of the invention

[0005] The purpose of the present invention is to provide an ammonia capture agent for near-surface air and a preparation method thereof, so as to effectively solve the problem of ammonia pollution prevention and control in near-surface ambient air.

[0006] To achieve the above-mentioned object, the present invention provides an ammonia capture agent for near-surface air, comprising: 3 to 10 parts of sodium chloride, 5 to 15 parts of calcium chloride, 5 to 10 parts of magnesium chloride, 10 to 20 parts of calcium magnesium acetate, 0.1 to 0.5 parts of benzotriazole, 5 to 15 parts of organic sodium salt, 0.2 to 1 parts of inorganic thickener, 10 to 20 parts of polyol, 40 to 120 parts of water; wherein the organic sodium salt is selected from one or more of sodium formate, sodium acetate, sodium gluconate, and sodium stearate, the polyol is selected from one or more of ethylene glycol, diethylene glycol, glycerol, and dipropylene glycol, and the inorganic thickener is selected from one or more of bentonite, attapulgite, and aluminum silicate.

[0007] Another object of the present invention is to provide a method for preparing an ammonia capture agent for near-surface air, comprising the following steps: adding 3 to 10 parts of sodium chloride, 5 to 15 parts of calcium chloride, 5 to 10 parts of magnesium chloride, 10 to 20 parts of calcium magnesium acetate, 0.1 to 0.5 parts of benzotriazole, 5 to 15 parts of organic sodium salt, 0.2 to 1 part of inorganic thickener, 10 to 20 parts of polyol, and 40 to 120 parts of water into a stirring tank, and stirring and mixing until the solution is transparent and the solution viscosity is greater than 15 mPa·s.

[0008] Based on the above technical solution, the advantages of the present invention are:

[0009] The ammonia capture agent of the present invention can effectively reduce the ammonia concentration in the near-surface air by 5% to 15%, and can effectively prevent ammonia from escaping into the air again. Ammonia can be adsorbed by the capture agent to form a stable ammonium salt, which is then flushed by sanitation vehicles or rainwater and enters the underground pipe network sewage collection system. The ammonia capture agent of the present invention can play a role in the synergistic reduction of multiple pollutants. While controlling ammonia, it can also reduce PM in the near-surface air. 2.5 、PM 10 , NOx also has a certain adsorption effect. DETAILED DESCRIPTION

[0010] The technical solution of the present invention is further described in detail below through embodiments.

[0011] The invention provides an ammonia capture agent for near-surface air, comprising the following components in mass parts: 3-10 parts of sodium chloride, 5-15 parts of calcium chloride, 5-10 parts of magnesium chloride, 10-20 parts of calcium magnesium acetate, 0.1-0.5 parts of benzotriazole, 5-15 parts of organic sodium salt, 0.2-1 parts of inorganic thickener, 10-20 parts of polyol, and 40-120 parts of water; wherein the organic sodium salt is selected from one or more of sodium formate, sodium acetate, sodium gluconate, and sodium stearate, the polyol is selected from one or more of ethylene glycol, diethylene glycol, glycerol, and dipropylene glycol, and the inorganic thickener is selected from one or more of bentonite, attapulgite, and aluminum silicate.

[0012] The ammonia capture agent has good ammonia solubility and is composed of a calcium-magnesium multi-component compound. Since the calcium atom has an empty 3d orbital to accommodate the lone pair of electrons of ammonia to form a coordination bond, it is easy to react with ammonia to form a stable complex such as octaammine calcium chloride, thereby efficiently capturing ammonia. According to tests, the ammonia concentration control rate can reach 5% to 15%.

[0013] The invention discloses a method for preparing an ammonia capture agent for near-surface air, comprising the following steps: adding 3 to 10 parts of sodium chloride, 5 to 15 parts of calcium chloride, 5 to 10 parts of magnesium chloride, 10 to 20 parts of calcium magnesium acetate, 0.1 to 0.5 parts of benzotriazole, 5 to 15 parts of organic sodium salt, 0.2 to 1 part of inorganic thickener, 10 to 20 parts of polyol and 40 to 120 parts of water into a stirring tank, and stirring and mixing the mixture until the solution is transparent and the viscosity of the solution is greater than 15 mPa·s.

[0014] The ammonia capture agent prepared by the method of the present invention can effectively reduce the ammonia concentration in the near-surface air, with a reduction rate of 5% to 15%, and can effectively prevent ammonia from escaping into the air for the second time. Ammonia can be adsorbed by the capture agent to form a stable ammonium salt, which is then flushed by sanitation vehicles or rainwater and enters the underground pipe network sewage collection system. The ammonia capture agent of the present invention can play a role in the synergistic reduction of multiple pollutants. While controlling ammonia, it can also reduce PM in the near-surface air. 2.5 、PM 10 , NOx also has a certain adsorption effect.

[0015] Embodiment 1

[0016] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (100 kg), benzotriazole (1 kg), sodium formate (60 kg), ethylene glycol (132 kg), attapulgite (2 kg), and water (500 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the viscosity of the solution was greater than 15 mPa·s.

[0017] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0018] The on-site detection by ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 13.3 μg / m 3 Down to 12.6 μg / m 3 , ammonia concentration decreased by 5.3%.

[0019] Embodiment 2

[0020] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (100 kg), benzotriazole (1 kg), sodium gluconate (60 kg), glycerol (132 kg), attapulgite (2 kg), and water (500 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the viscosity of the solution was greater than 15 mPa·s.

[0021] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0022] The on-site detection by ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 14.7μg / m 3 Down to 13.8 μg / m 3 , ammonia concentration decreased by 6.1%.

[0023] Embodiment 3

[0024] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (150 kg), benzotriazole (1 kg), sodium gluconate (60 kg), glycerol (132 kg), attapulgite (2 kg), and water (500 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the viscosity of the solution was greater than 20 mPa·s.

[0025] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0026] The on-site detection by ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 14.9μg / m 3 Down to 13.6 μg / m 3 , ammonia concentration decreased by 8.7%.

[0027] Embodiment 4

[0028] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (150 kg), benzotriazole (1 kg), sodium gluconate (110 kg), glycerol (132 kg), attapulgite (2 kg), and water (400 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the viscosity of the solution was greater than 20 mPa·s.

[0029] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0030] The ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 15.8 μg / m 3 Down to 14.1 μg / m 3 , ammonia concentration decreased by 10.8%.

[0031] Embodiment 5

[0032] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (150 kg), benzotriazole (1 kg), sodium gluconate (110 kg), dipropylene glycol (132 kg), attapulgite (2 kg), and water (400 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the solution viscosity was greater than 25 mPa·s.

[0033] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0034] The ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 16.8 μg / m 3 Reduced to 14.5 μg / m 3 , ammonia concentration decreased by 13.7%.

[0035] Embodiment 6

[0036] 1) Preparation of ammonia scavenger: Sodium chloride (50 kg), calcium chloride (75 kg), magnesium chloride (80 kg), calcium magnesium acetate (150 kg), benzotriazole (1 kg), sodium gluconate (110 kg), dipropylene glycol (130 kg), attapulgite (2 kg), aluminum silicate (2 kg), and water (400 kg) were added to a stirring tank and mixed thoroughly until the solution was transparent and the viscosity of the solution was greater than 30 mPa·s.

[0037] 2) Application of ammonia scavenger: Pour the prepared ammonia scavenger (1 ton) into a 10 cubic meter sprinkler truck, add 9 tons of water, mix well, and then slowly spray it on the road surface with a spraying amount of about 0.2 liters / square meter (preferably to prevent runoff).

[0038] The ammonia detector showed that the ammonia concentration in the air near the road surface of the sprayed section was 17.1 μg / m 3 Reduced to 14.5 μg / m 3 , ammonia concentration decreased by 15.2%.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An ammonia capture agent for near-surface air, characterized in that: The invention comprises the following parts by weight: 3 to 10 parts of sodium chloride, 5 to 15 parts of calcium chloride, 5 to 10 parts of magnesium chloride, 10 to 20 parts of calcium magnesium acetate, 0.1 to 0.5 parts of benzotriazole, 5 to 15 parts of organic sodium salt, 0.2 to 1 parts of inorganic thickener, 10 to 20 parts of polyol, and 40 to 120 parts of water; wherein the organic sodium salt is selected from one or more of sodium formate, sodium acetate, sodium gluconate, and sodium stearate; the polyol is selected from one or more of ethylene glycol, diethylene glycol, glycerol, and dipropylene glycol; the inorganic thickener is selected from bentonite, attapulgite, and the like. 、 One or more of aluminum silicates.

2. A method for preparing an ammonia scavenger for near-surface air, characterized in that: The method comprises the following steps: adding 3 to 10 parts of sodium chloride, 5 to 15 parts of calcium chloride, 5 to 10 parts of magnesium chloride, 10 to 20 parts of calcium magnesium acetate, 0.1 to 0.5 parts of benzotriazole, 5 to 15 parts of organic sodium salt, 0.2 to 1 part of inorganic thickener, 10 to 20 parts of polyol and 40 to 120 parts of water into a stirring tank, and stirring and mixing the mixture until the solution is transparent and the viscosity of the solution is greater than 15 mPa·s.