Method for capturing sulfur dioxide by employing imidazolyl ionic liquid

A sulfur dioxide, ionic liquid technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of by-products, absorbent not easy to regenerate, small absorption capacity, poor cycle performance, etc., to avoid hydrogen bond networks. The effect of forming, improving absorption capacity and reducing viscosity

Inactive Publication Date: 2011-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional methods for capturing sulfur dioxide in industry are lime and amine solution methods, which have the advantages of low cost, fast absorption, and large capacity, but there are also some limitations: such as solvents are volatile, generate a large amount of by-products, and absorbents are not easy to regenerate And other issues
Among the current methods for capturing sulfur dioxide by using ionic liquids, although the physical absorption method is easy to desorb, the absorption capacity under reduced pressure is too small; while the chemical absorption method has a large absorption capacity, but the stability is not good and the cycle performance is poor.

Method used

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  • Method for capturing sulfur dioxide by employing imidazolyl ionic liquid
  • Method for capturing sulfur dioxide by employing imidazolyl ionic liquid
  • Method for capturing sulfur dioxide by employing imidazolyl ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In a 5ml glass container with an inner diameter of 1cm, add the ionic liquid tetradecyl trihexylphosphorus triazole ([P 66614 ][Tetz]) 1.2g (0.02mol), then slowly introduce sulfur dioxide gas, the flow rate is 60ml / min, the pressure is 0.1MPa, the absorption temperature is controlled at 20°C, and the absorption time is controlled at 0.5 hours. The weighing shows that the sulfur dioxide in the ionic liquid The absorption capacity is 3.72 mol / mol ionic liquid.

Embodiment 2-7

[0016] Similar to Example 1, the sulfur dioxide gas pressure was controlled to 0.1 MPa, the absorption temperature was 20°C, and the type of ionic liquid was changed. The results of sulfur dioxide absorption are shown in the following table (Table 1):

[0017] Table 1 Effects of different ionic liquids on SO2 capture

[0018]

Embodiment 8-16

[0020] Similar to Example 1, tetradecyltrihexylphosphorus tetrazole was used as absorbent to absorb sulfur dioxide gas, and conditions such as absorption temperature, gas pressure, and absorption time were changed. The absorption results are shown in the following table (Table 2):

[0021] Table 2 Effect of different absorption conditions on SO2 absorption

[0022]

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PUM

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Abstract

The invention relates to a method for removing sulfur dioxide from flue gas by employing high-stability alkaline ionic liquid, in particular to a method for absorbing sulfur dioxide gas by taking weakly alkaline quaternary phosphorus ionic liquid as an absorbent. The absorption pressure is between 0.0001 and 0.1MPa, the absorption temperature is between 20 and 80 DEG C, the absorption time is 0.1to 2 hours, the desorption temperature is between 60 and 120 DEG C, and the desorption time is 0.1 to 3 hours. The technical scheme has the advantages that: the ionic liquid is high in stability, high in absorptive capacity and easy to desorb, and the method has industrial application potential.

Description

technical field [0001] The invention relates to a high-stability azole-based alkaline ionic liquid, which is applied to the chemical capture of sulfur dioxide to realize a high-capacity, low-energy-consumption and recyclable capture method for sulfur dioxide, and provides a method for industrial capture of sulfur dioxide new potential approach. Background technique [0002] With the rapid development of economy and society and the improvement of people's living standards, the sulfur dioxide emitted by coal combustion has deteriorated the atmospheric environment, and the harm of acid rain has increased, which has seriously affected human survival and the ecological environment. The removal of sulfur dioxide in flue gas has caused extensive attention at home and abroad focus on. How to develop efficient, reversible, and low-cost flue gas removal of sulfur dioxide technology is a hot issue of global concern. [0003] At present, the traditional methods for capturing sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 王从敏崔国凯李浩然
Owner ZHEJIANG UNIV
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