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Membrane-based sulfur dioxide absorption compound collector

A sulfur dioxide and composite technology, applied in the field of liquid-gas separation and flue gas desulfurization, achieves the effects of high desulfurization rate, low viscosity and low price

Inactive Publication Date: 2013-12-11
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We absorb SO in the membrane 2 A lot of experimental research work has been done on composite absorbents, and novel and efficient composite absorbents have been proposed, which are currently used in flue gas purification of SO 2 There is no use and report in the field

Method used

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  • Membrane-based sulfur dioxide absorption compound collector
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  • Membrane-based sulfur dioxide absorption compound collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The evaluation method of the capture and absorption performance of the membrane-absorbed sulfur dioxide composite collector.

[0026] Operating conditions: room temperature (19-22°C), mixed gas pressure 0.11MPa, membrane mass transfer area 1.5 m 2 , the gas flow rate is 0.5-2 L / min, and the liquid flow rate is 200-500mL / min.

[0027] Such as figure 1 shown, respectively from N 2 Gas cylinder 1-1 and SO 2 After the gas in the gas cylinder 1-2 is measured by the gas quality control instrument 2, it enters the mixing and stabilizing tank 3 to form SO containing 0.1%-0.6% (volume percentage). 2 Mixed gas, the mixed gas after the air flow is stabilized enters the membrane contactor 4, and the SO in the mixed gas 2 It diffuses to the other side of the membrane through the membrane pores, is absorbed by the composite collector, and enters the liquid phase. The absorbed gas phase is released from the gas outlet at the other end of the membrane contactor. The composite colle...

Embodiment 2

[0037] In this embodiment, the membrane-absorbing sulfur dioxide composite collector is an aqueous solution of potassium citrate / sodium citrate and glycinate, and the total concentration of potassium citrate / sodium citrate and glycinate in the aqueous solution is 0.1~3.0mol / L , the molar ratio of potassium citrate / sodium citrate to glycinate is 1: (0.5~2.5).

[0038] In this embodiment, the glycinate may be sodium glycinate, potassium glycinate or a mixture of sodium glycinate and potassium glycinate.

[0039] The performance evaluation method in Example 1 is used for detection.

[0040] Process operating conditions: room temperature, gas phase pressure 0.11MPa, mixed gas SO 2 Content 0.1%-0.6% (volume percentage), membrane mass transfer area 1.5m 2 , gas velocity: 0.5-2L / min, liquid velocity: 200-500mL / min.

[0041] The performance evaluation results of various desulfurizers under various conditions are shown in Table 1.

[0042] Table 1 Performance evaluation results of ...

Embodiment 3

[0047] The aqueous organic acid salt solution used to separate sulfur dioxide in the mixed gas is an aqueous solution of potassium citrate / sodium citrate and β-alanine salt, and the total concentration of potassium citrate / sodium citrate and β-alanine salt in the aqueous solution 0.1~3.0mol / L, the molar ratio of potassium citrate / sodium citrate to β-alanine salt is 1:(0.5~2.5).

[0048] In this embodiment, the β-alanine salt can be sodium β-alanine, potassium β-alanine or a mixture of sodium β-alanine and potassium β-alanine.

[0049] The performance evaluation method in Example 1 is used for detection.

[0050] Process operating conditions: room temperature, gas phase pressure 0.11MPa, mixed gas SO 2 Content 0.1%-0.6% (volume percentage), membrane mass transfer area 1.5m 2 , gas velocity: 0.5-2L / min, liquid velocity: 200-500mL / min.

[0051] The performance evaluation results of various desulfurizers under various conditions are shown in Table 2.

[0052] Table 2 Performan...

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Abstract

The invention relates to the field of liquid-gas separation, especially to the field of flue gas desulphurization, specifically to a membrane-based sulfur dioxide absorption compound collector. The objective of the invention is to provide a sulfur dioxide absorbent used for absorption of a membrane contactor. The membrane-based sulfur dioxide absorption compound collector is composed of citrate and an aqueous solution of an amino acid salt mixed according to a mol ratio of 1: 0.5-3.0. The membrane-based sulfur dioxide absorption compound collector has the advantages of good chemical stability, small foamability, small viscosity and a wide source, easy purchasing and a low price of raw materials. A desulphurization process using the membrane-based sulfur dioxide absorption compound collector has the advantages of a high mass transfer coefficient, no disturbance during flowing of gas and liquid, small mass transfer resistance, a high desulfurization rate, convenience in operation, great operational flexibility, no secondary pollution and stable running in the membrane contactor.

Description

technical field [0001] The invention relates to the field of liquid-gas separation, in particular to the field of flue gas desulfurization, and more specifically relates to a membrane-absorbing sulfur dioxide composite collector. [0002] Background technique [0003] SO in the flue gas of coal-fired power plants and metallurgical industries 2 It is one of the main pollutants in the atmosphere and the source of acid rain. With the increasing requirements of environmental protection on the emission of air pollutants, in the flue gas desulfurization purification, how to reasonably select the desulfurization process to achieve SO 2 Emissions in line with the national emission standards is a key issue for the healthy development of flue gas desulfurization in coal-fired power plants and metallurgical industries. Therefore, various high-performance SO 2 The development of absorbents is one of the research topics in this field. In recent years, composite absorbents have become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/22
Inventor 陆建刚潘偲陆春婷陈悦赵云龙张慧许正文
Owner NANJING UNIV OF INFORMATION SCI & TECH
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