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Preparation method and application of ionic liquid for absorbing SO2

An ionic liquid and SO2 technology, applied in the chemical industry, can solve the problems of high synthesis cost, long production process, and low absorption rate

Inactive Publication Date: 2013-05-01
SHIJIAZHUANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But now many ionic liquids studied on SO 2 The absorption rate of gas is low, and it has the disadvantages of high synthesis cost and long production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Weigh 0.5mol caprolactam and 0.2mol zinc sulfate, add caprolactam into the reactor, turn on the stirrer to stir, add zinc sulfate, react at 90°C for 2h, and then dry the obtained liquid in a vacuum oven at 50°C for 1h to obtain Colorless and transparent ionic liquid.

[0012] Place the obtained caprolactam-zinc sulfate ionic liquid in an absorber, place a stirrer in the absorber, and feed SO into the absorber at a constant temperature of 10mL / min at 25°C 2 Gas, the outlet of the absorption tail gas is passed into 20% sodium hydroxide solution to absorb SO 2 Exhaust gas, weigh the absorber every 0.5h until constant weight, after balance, SO 2 The molar fraction in the ionic liquid is 0.75. SO 2 Mole fraction refers to SO 2 The number of moles in SO 2 and the proportion of moles of all components of the ionic liquid.

Embodiment 2

[0014] Weigh 0.7mol propionamide and 0.3mol zinc nitrate, add propionamide into the reactor, turn on the stirrer to stir, add zinc nitrate, react at 95°C for 2h, then dry the obtained liquid in a vacuum oven at 60°C for 2h , to obtain a colorless and transparent ionic liquid.

[0015] Place the obtained propionamide-zinc nitrate ionic liquid in an absorber, place a stirrer in the absorber, and feed SO into the absorber at a constant temperature of 10mL / min at 25°C 2 Gas, the outlet of the absorption tail gas is passed into 20% sodium hydroxide solution to absorb SO 2 Exhaust gas, weigh the absorber every 0.5h until constant weight, after balance, SO 2 The molar fraction in the ionic liquid is 0.65.

Embodiment 3

[0017] Weigh 0.3mol caprolactam and 0.1mol lithium chloride, add caprolactam into the reactor, turn on the stirrer to stir, add lithium chloride, react at 75°C for 2h, then dry the obtained liquid in a vacuum oven at 50°C for 4h , to obtain a colorless and transparent ionic liquid.

[0018] Place the obtained caprolactam-lithium chloride ionic liquid in the absorber, place a stirrer in the absorber, and feed SO into the absorber at a constant temperature of 10mL / min at 25°C 2 Gas, the outlet of the absorption tail gas is passed into 20% sodium hydroxide solution to absorb SO 2 Exhaust gas, weigh the absorber every 0.5h until constant weight, after balance, SO 2 The molar fraction in the ionic liquid is 0.82.

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Abstract

The invention provides a preparation method of an ionic liquid for absorbing SO2, and an application of the ionic liquid in absorbing SO2. The preparation method of the ionic liquid comprises the steps of uniformly mixing one of aluminium chloride, zinc chloride, lithium chloride, aluminum sulfate, zinc sulfate, lithium sulfate, aluminium nitrate, zinc nitrate and lithium nitrate with one or two of urea, propanamide, butyramide, caprolactam, N,N-dimethylformamide and N,N-dimethylacetamide at a molar ratio of 1:(1-10) or 1:(0.5-3):(1-7), conducting reaction for 1-10h at 70-150 DEG C, conducting vacuum drying on an obtained solution at 40-60 DEG C, and obtaining the ionic liquid. The ionic liquid is mainly used for quickly and efficiently absorbing SO2. With the adoption of the ionic liquid as an SO2 absorbent, requirements on equipment required for absorbing SO2 are simple, the operational conditions are mild, the absorption efficiency is high, the cost is low, the ionic liquid can be recycled, and waste liquid and waste water discharge and other problems do not exist, and the ionic liquid is suitable for industrial production, meets the requirements of green chemical development of the contemporary society, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a 2 Preparation of gas-based ionic liquids and their role in absorbing SO 2 gas applications. Background technique [0002] Air pollution is one of the major environmental problems faced by human beings, among which SO 2 Pollution has the greatest impact on the environment. SO 2 It mostly exists in industrial waste gas. Its discharge will not only cause environmental pollution, but also form acid rain, which will bring economic losses to human beings and even affect human health. [0003] At present, the methods of industrial waste gas desulfurization are mainly divided into dry method and wet method. Among them, the dry method adopts fluidized bed desulfurization. The desulfurization efficiency of this process is lower than that of the wet method. It is not suitable for desulfurization of industrial waste gas with high sulfur content, and has higher requirements for operati...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 王娟贾鹏飞张星辰张梓航苌美燕张芳司海燕
Owner SHIJIAZHUANG UNIVERSITY
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