Desorbing method and device of absorption rich liquor for absorbing sulfur dioxide by using citrate solution

A technology of sulfur dioxide and citrate, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of environmental pollution, process cost reduction, high concentration of sulfate radicals and citric acid decomposition products, and achieve desorption. High efficiency, improving desorption side reactions, and suppressing desorption side reactions

Inactive Publication Date: 2011-01-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high desorption temperature used in the existing atmospheric pressure steam desorption method, it is easy to cause the concentration of sulfate radicals and citric acid decomposition products in the absorption liquid to be too high, thereby affecting the subsequent cycle absorption and desorption process, and the existing method is to absorb The liquid is discharged as waste liquid after being used 3-10 times, which restricts the reduction of process cost and operational stability while seriously polluting the environment

Method used

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  • Desorbing method and device of absorption rich liquor for absorbing sulfur dioxide by using citrate solution
  • Desorbing method and device of absorption rich liquor for absorbing sulfur dioxide by using citrate solution

Examples

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Embodiment 1

[0020] like figure 1 As shown, a heat exchanger 1, a decompression membrane desorber 2, a gas cooling device 3 and a vacuum ejector 4 are arranged in sequence; wherein, the heat exchanger 4 is used to absorb rich liquid and exchange heat with steam, and the membrane desorber 2 is used to absorb the rich liquid for desorption, the gas cooling device 3 is used to separate sulfur dioxide from steam, and the vacuum ejector 4 is used to generate negative pressure;

[0021] Citrate absorption liquid with sodium citrate / potassium as absorbent to make it absorb low concentration SO in a packed tower 2 , to obtain the absorption rich solution with a citrate concentration of 0.1mol / L and a sulfurous acid concentration of 10g / L, heat exchange through the heat exchanger 1, and then send it into the membrane desorber 2 for rich solution desorption; the membrane desorber 2 Utilize the negative pressure gas produced by vacuum ejector 4 to provide decompression operating conditions for membr...

Embodiment 2

[0023] like figure 1 Shown, device is arranged with embodiment 1.

[0024] Citrate absorption liquid with sodium citrate / potassium as absorbent to make it absorb low concentration SO in a packed tower 2 , to obtain the absorption rich solution with a citrate concentration of 1.0mol / L and a sulfurous acid concentration of 80g / L, heat exchange through the heat exchanger 1, and then send it into the membrane desorber 2 for rich solution desorption; the membrane desorber 2 The negative pressure gas produced by vacuum ejector 4 provides decompression operating conditions for membrane desorber 2. The operating conditions are as follows: the pressure is 1.5MPa, and the operating temperature is 45°C; the desorption temperature of membrane desorber 2 is 90°C. The pressure is 0.70atm, the desorption time is 10 minutes, and the desorption rate is higher than 98%. After the desorption is completed, the desorption gas passes through the gas cooling device 3 to separate the sulfur dioxide ...

Embodiment 3

[0026] like figure 1 Shown, device is arranged with embodiment 1.

[0027] Citrate absorption liquid with sodium citrate / potassium as absorbent to make it absorb low concentration SO in a packed tower 2 , to obtain the absorption rich solution with a citrate concentration of 2.0mol / L and a sulfurous acid concentration of 140g / L, heat exchange through the heat exchanger 1, and then send it into the membrane desorber 2 for rich solution desorption; the membrane desorber 2 Utilize the negative pressure gas produced by the vacuum ejector 4 to provide decompression operating conditions for the membrane desorber 2, the operating conditions are as follows: the pressure is 3.0MPa, the operating temperature is 60°C, the desorption temperature of the membrane desorber 2 is 100°C, and the desorption pressure 0.60atm, the desorption time is 10 minutes, and the desorption rate is higher than 98%. After the desorption is completed, the desorption gas passes through the gas cooling device 3...

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Abstract

The invention relates to a desorbing method and device of absorption rich liquor for absorbing sulfur dioxide by using citrate solution, wherein the device comprises a heat exchanger, a membrane-type desorbing machine, a gas cooling device and a vacuum ejector connected in sequence. The vacuum ejector is further communicated with the membrane-type desorbing machine; the heat exchanger is used forexchanging heat of the absorption rich liquor and steam; the membrane-type desorbing machine is used for desorbing the rich liquor; the gas cooling device is used for separating sulfur dioxide and water steam; the vacuum ejector is used for generating negative pressure; after exchanging heat with steam through the heat exchanger, absorption rich liquor is added to the membrane-type desorbing machine for desorbing, wherein the desorbing temperature is 30-100 DEG C, the desorbing pressure is 0.6-0.85atm and the desorbing time is 1-30min; the desorbing gas is cooled by the gas cooling device at 0-20 DEG C and separates the sulfur dioxide and steam; the sulfur dioxide enters the vacuum ejector and is prepared into sulfur dioxide gas with high concentration; and the condensed liquid in the gascooling device is returned into the membrane-type desorbing machine.

Description

technical field [0001] The invention relates to a desorption method and device for absorbing rich liquid in which citrate solution absorbs sulfur dioxide, in particular to a method and device for efficiently desorbing rich liquid in the process of absorbing low-concentration sulfur dioxide in citrate solution. Background technique [0002] Sulfur dioxide is a harmful gas, especially low-concentration sulfur dioxide is a waste gas that is difficult to effectively control. The use of citrate solution can effectively absorb the gas containing sulfur dioxide, and some methods can be used to separate the sulfur dioxide dissolved in the solution, and finally use high-concentration sulfur dioxide as the product, or use this high-concentration sulfur dioxide as raw material to make acid and use sulfuric acid as Products are sold. [0003] The method currently used by citrate to absorb sulfur dioxide is: use a packed tower as an absorption reactor, use a certain concentration of cit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
Inventor 洪涛彭济时李林波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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