CN113082944B - Composite absorbent for removing sulfur dioxide in tail gas and preparation method thereof - Google Patents
Composite absorbent for removing sulfur dioxide in tail gas and preparation method thereof Download PDFInfo
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- CN113082944B CN113082944B CN202110325769.0A CN202110325769A CN113082944B CN 113082944 B CN113082944 B CN 113082944B CN 202110325769 A CN202110325769 A CN 202110325769A CN 113082944 B CN113082944 B CN 113082944B
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- sulfur dioxide
- composite absorbent
- tail gas
- removing sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/50—Combinations of absorbents
- B01D2252/504—Mixtures of two or more absorbents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a composite absorbent for removing sulfur dioxide in tail gas and a preparation method thereof. The invention relates to a composite absorbent for removing sulfur dioxide in tail gas, which comprises the following components in percentage by weight: 2.3 to 2.8 percent of alcohol; 44.2 to 48.3 percent of amine; 1.5 to 1.7 percent of tin salt; 47.2 to 51.9 percent of deionized water. The sulfur dioxide composite absorbent is prepared under a specific proportion when the amine substance consists of tetramethyl ammonium chloride and N-methyl diethanol amine, the alcohol substance consists of isopropanol and tert-butyl amino ethanol, and the salt consists of tin chloride and tin sulfate.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a composite absorbent for removing sulfur dioxide in tail gas and a preparation method thereof.
Background
Sulfur dioxide is a major cause of acid precipitation and is one of the main pollutants responsible for haze and deterioration of atmospheric quality. Through the development of many years, a large number of flue gas desulfurization facilities are built in China, the SO2 emission reduction work obtains remarkable effect along with the continuous improvement of the national environmental protection requirement, and sulfur dioxide in gases such as boiler flue gas and sintering machine tail gas discharged in the atmosphere has a stricter standard.
The research and development personnel in the field are constantly striving to find absorbents with higher sulphur dioxide absorption.
Disclosure of Invention
The invention aims to provide a composite absorbent for removing sulfur dioxide in tail gas, which is used for absorbing the tail gas of a coal boiler and has high absorption efficiency.
Further, the invention also provides a preparation method of the composite absorbent for removing sulfur dioxide in tail gas.
The composite absorbent for removing sulfur dioxide in tail gas comprises the following components in percentage by weight:
2.3 to 2.8 percent of alcohol;
44.2 to 48.3 percent of amine;
1.5 to 1.7 percent of tin salt;
47.2 to 51.9 percent of deionized water.
Preferably, the composite absorbent for removing sulfur dioxide in tail gas comprises the following components in parts by weight:
2.4 percent of alcohol;
44.2% of amine;
1.5 percent of tin salt;
and 51.9% of deionized water.
Wherein the alcohol is composed of isopropanol and tert-butylamine based ethanol.
Wherein the amine consists of tetramethylammonium chloride and N-methyldiethanolamine.
Wherein the tin salt is composed of tin chloride and tin sulfate.
Preferably, the composite absorbent for removing sulfur dioxide in tail gas comprises the following components in parts by weight:
1-1.5% of isopropanol;
0.8 to 1.8 percent of tert-butylamine ethanol;
22.3 to 25 percent of tetramethylammonium chloride;
20.4-26% of N-methyldiethanolamine;
0.5 to 1 percent of stannic chloride;
0.6 to 1.2 percent of tin sulfate;
47.2 to 51.9 percent of deionized water.
More preferably, the composite absorbent for removing sulfur dioxide in tail gas comprises the following components in parts by weight:
1.1% of isopropanol;
1.3 percent of tert-butylamine ethyl alcohol;
23.8 percent of tetramethylammonium chloride;
20.4 percent of N-methyldiethanolamine;
0.8 percent of stannic chloride;
0.7 percent of tin sulfate;
and 51.9 percent of deionized water.
A preparation method of a composite absorbent for removing sulfur dioxide in tail gas comprises the steps of uniformly mixing isopropanol, tert-butylamine ethyl alcohol, tetramethylammonium chloride, N-methyldiethanolamine, tin chloride, tin sulfate and deionized water in proportion to prepare the composite absorbent for sulfur dioxide.
In the prior art, the absorbent prepared from amine and alcohol in the common sulfur dioxide absorbent absorbs sulfur dioxide in tail gas, but the formula and the proportion are selected more, so that the sulfur dioxide absorbent with higher absorption rate is not easy to select in practice.
The invention relates to a sulfur dioxide absorbent consisting of amine, alcohol, salt and water, wherein the amine substance consists of tetramethylammonium chloride and N-methyldiethanolamine, the alcohol substance consists of isopropanol and tert-butylamine ethyl alcohol, and the salt consists of tin chloride and tin sulfate.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the technical field better understand the scheme of the present invention.
Description of the raw materials
The raw material source is commercially available.
Examples 1 to 3 and comparative examples 1 to 5
Preparing materials according to a formula table shown in table 1, and uniformly mixing all the materials to prepare the sulfur dioxide composite absorbent.
Comparative example 6
And replacing tetramethylammonium chloride in the comparative example 1 with triethylene tetramine, and keeping the rest raw materials and parts by weight unchanged to prepare the sulfur dioxide composite absorbent.
Comparative example 7
And replacing isopropanol in the comparative example 2 with 2-piperidine ethanol, and keeping the rest raw materials and parts by weight unchanged to prepare the sulfur dioxide composite absorbent.
Comparative example 8
And replacing the tin chloride in the comparative example 3 with copper sulfate, and keeping the rest raw materials and the parts by weight unchanged to prepare the sulfur dioxide composite absorbent.
TABLE 1 Sulfur dioxide Compound absorbent formulation Table (Unit: parts by weight)
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Isopropanol (I-propanol) | 1 | 1.1 | 1.5 | 1.1 | 2.4 | 1.1 | 5.2 | 1.1 |
| Tert-butylamine radical ethanol | 1.8 | 1.3 | 0.8 | 1.3 | / | 1.3 | 6.2 | 1.3 |
| Tetramethylammonium chloride | 22.3 | 23.8 | 25 | 44.2 | 23.8 | 23.8 | 18.2 | 20.8 |
| N-methyldiethanolamine | 26 | 20.4 | 21.5 | / | 20.4 | 20.4 | 17 | 19.2 |
| Tin chloride | 0.5 | 0.8 | 1 | 0.8 | 0.8 | 1.5 | 0.8 | 2.5 |
| Tin sulfate | 1.2 | 0.7 | 0.6 | 0.7 | 0.7 | / | 0.7 | 3.2 |
| Deionized water | 47.2 | 51.9 | 49.6 | 51.9 | 51.9 | 51.9 | 51.9 | 51.9 |
The sulfur dioxide composite absorbent prepared in the examples 1 to 3 and the comparative examples 1 to 8 is applied to the absorption treatment of the coal boiler tail gas in a certain factory at normal temperatureUnder the condition, the tail gas contains 3500-4000mg/m of sulfur dioxide 3 After passing through the cleaning tower, the composite absorbents of examples 1-3 and comparative examples 1-8 were used to wash the tail gas under the same chemical parameters, and the inlet and outlet sulfur dioxide contents were recorded, respectively, as shown in table 2.
TABLE 2 absorption effect of sulfur dioxide composite absorbent
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 | |
| Inlet SO 2 Content (mg/m) 3 ） | 3857 | 3960 | 3795 | 3788 | 3820 | 3856 | 3925 | 3715 | 3846 | 3898 | 3952 |
| Outlet SO 2 Content (mg/m) 3 ） | 3799 | 3909 | 3730 | 3629 | 3652 | 3702 | 3772 | 3526 | 3642 | 3672 | 3762 |
| Desulfurization efficiency (%) | 98.5 | 98.7 | 98.3 | 95.8 | 95.6 | 96.0 | 96.1 | 94.9 | 94.7 | 94.2 | 95.2 |
The experimental results in table 2 show that when the sulfur dioxide absorbent composed of amine, alcohol, salt and water, wherein the amine substance is composed of tetramethylammonium chloride and N-methyldiethanolamine, the alcohol substance is composed of isopropanol and tert-butylamine-based ethanol, and the salt is composed of tin chloride and tin sulfate, the sulfur dioxide composite absorbent prepared under a specific ratio has a remarkably improved absorption rate of sulfur dioxide when used in a washing tower for coal boiler tail gas.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The composite absorbent for removing sulfur dioxide in tail gas is characterized by comprising the following components in parts by weight:
1-1.5% of isopropanol;
0.8 to 1.8 percent of tert-butylamine ethanol;
22.3 to 25 percent of tetramethylammonium chloride;
20.4 to 26 percent of N-methyldiethanolamine;
0.5 to 1 percent of stannic chloride;
0.6 to 1.2 percent of tin sulfate;
47.2 to 51.9 percent of deionized water.
2. The composite absorbent for removing sulfur dioxide in tail gas as claimed in claim 1, characterized by comprising the following components by weight:
1.1% of isopropanol;
1.3 percent of tert-butylamine ethyl alcohol;
23.8 percent of tetramethylammonium chloride;
20.4 percent of N-methyldiethanolamine;
0.8 percent of stannic chloride;
0.7 percent of tin sulfate;
and 51.9% of deionized water.
3. The preparation method of the composite absorbent for removing sulfur dioxide in tail gas according to claim 1 or 2, wherein the composite absorbent for sulfur dioxide is prepared by uniformly mixing isopropanol, tert-butylamine ethyl alcohol, tetramethylammonium chloride, N-methyldiethanolamine, tin chloride, tin sulfate and deionized water in proportion.
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| CN202110325769.0A CN113082944B (en) | 2021-03-26 | 2021-03-26 | Composite absorbent for removing sulfur dioxide in tail gas and preparation method thereof |
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| CN113082944B true CN113082944B (en) | 2023-02-03 |
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Citations (13)
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