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Method for deprivig sulfur dioxide in solution of citrate

A technology of sulfur dioxide and citrate, which is applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve problems affecting the circulation and absorption of citrate solution, high decomposition rate of citrate, and high steam loss , to achieve the effects of reducing loss, reducing production, and reducing energy for separation

Inactive Publication Date: 2005-08-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

However, the steam loss of this process is too high, the decomposition rate of citrate is high, and a high concentration of sulfate ions is generated, which affects the circulation and absorption of citrate solution

Method used

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  • Method for deprivig sulfur dioxide in solution of citrate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the operation steps of ultrasonic separation of sulfur dioxide are as follows:

[0019] (1) In the packing reaction tower, under the condition of temperature 30 DEG C, the exhaust gas with a sulfur dioxide concentration of 1.5% reacts with a 1.5mol / L citrate solution with a pH value of 4.5 to obtain a citrate solution containing sulfur dioxide; in the solution The concentration of sulfur dioxide is 160g / L; the pH of the solution is 1.50.

[0020] (2) Put the solution into an ultrasonic reactor, and react for 1.5 hours under the action of ultrasonic waves with a frequency of 20KHz, a solution temperature of 60°C, and a power of 60W / L to decompose 90% of sulfurous acid and escape from the solution in the form of sulfur dioxide ; After conventional treatment, the remaining solution is used to circulate and absorb sulfur dioxide-containing waste gas.

Embodiment 2

[0022] Absorption process is identical with example 1, and solution composition is substantially identical with example 1. Put the solution into the ultrasonic reactor, the temperature of the solution is 60°C, under the action of ultrasonic waves with a frequency of 40KHz and a power of 65W / L, react for 1.5 hours to decompose 96.3% of sulfurous acid and escape the solution in the form of sulfur dioxide; the remaining solution After conventional treatment, it is used to circulate and absorb sulfur dioxide-containing waste gas.

Embodiment 3

[0024] Absorption process is identical with example 1, and solution composition is substantially identical with example 1. Put the solution into the ultrasonic reactor, the temperature of the solution is 60°C, under the action of ultrasonic waves with a frequency of 60KHz and a power of 70W / L, react for 1.5 hours to decompose 98.2% of sulfurous acid and escape the solution in the form of sulfur dioxide; the remaining solution After conventional treatment, it is used to circulate and absorb sulfur dioxide-containing waste gas.

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Abstract

A process for removing SO2 from the solution of citrate features that the citrate solution which has absorbed SO2 is acted by ultrasonic waves to decompose the sulforous acid into water and SO2 which can escape from the solution, and the resultant citrate solution, can also be used to absorb SO2, so it can be used to remove SO2 from the waste gas.

Description

technical field [0001] The invention relates to a method for removing sulfur dioxide, in particular to a method for removing sulfur dioxide in a 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. In order to treat this kind of waste gas that pollutes the environment, the commonly used methods are alkaline absorption method and ion beam method, but these two methods have disadvantages such as high treatment cost, ineffective treatment of follow-up products, and waste residues. 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 sell it as a product with high concentration of sulfur dioxide. [0003] The currently adopted method for removing sulfur dioxide in citrate solution is: in a packed tower, use steam to heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/487C07C59/265
Inventor 薛娟琴洪涛李林波亢淑梅
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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