A method for treating tail gas of Claus process

A technology for process tail gas and oxygen, applied in separation methods, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of equipment investment, operation cost, energy consumption, air pollution, and less popularization and application, so as to reduce the burden on the atmospheric environment, The effect of low cost and simple process flow

Inactive Publication Date: 2014-10-22
BEIJING FUNGHAN ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these technologies are mature and reliable, the equipment investment, operation cost and energy consumption are relatively large, so far, they have rarely been popularized and applied.
In the market, the means of incineration and emission are still mostly used, resulting in serious air pollution

Method used

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  • A method for treating tail gas of Claus process

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Effect test

Embodiment 1

[0029] A natural gas chemical plant Claus process tail gas, SO in the gas 2 The content is 4235ppm, O 2 The content is 3vol%, and the water vapor content is 22vol%, from which a part of the process tail gas is drawn for testing. 30mL of columnar activated coke and 10mL of activated carbon fiber (catalyst) were placed in a fixed bed reactor with an inner diameter of 22mm and a length of 200mm. Raise the temperature to 60°C and ventilate the reaction. Gas flow rate 400mL / min, space velocity 600h -1 . While the tail gas continuously passes through the catalyst bed, water as a regenerated washing agent is also continuously passed into the catalyst bed from above, and the flow rate is 0.1-0.8 times the volume flow rate of the treated gas. In this embodiment, the flow rate of water is 50mL / min. After the sulfur dioxide in the exhaust gas is removed by oxidation reaction, the regenerated detergent becomes dilute sulfuric acid. Experimental results: The steady-state desulfurizat...

Embodiment 2

[0031] The gas composition is the same as in Example 1. A part of the process tail gas is extracted from it and continuously enters the fixed-bed reactor filled with 40mL spherical activated carbon desulfurizer from the lower inlet. The inner diameter of the reactor is 22mm and the length is 200mm. Strictly control the working temperature of the bed at 80°C, the gas flow at 533mL / min, and the space velocity at 800h -1 . While the tail gas continuously passes through the catalyst bed, dilute sulfuric acid is collected at the outlet of the reactor. The collected dilute sulfuric acid (initial acid concentration is 5%) is continuously returned to the catalyst bed from above as a regenerated detergent, and the tail gas is desulfurized by activated carbon. The surface of the agent reaches a dynamic equilibrium of adsorption-catalytic oxidation-desorption. Experimental results: The steady-state desulfurization rate is 89%, and the acid concentration reaches 40%.

[0032] Because t...

Embodiment 3

[0034] The gas composition is the same as in Example 1. 30 mL of columnar activated coke and 10 mL of activated carbon fiber are placed in a fixed-bed reactor, and the volume of the reactor is the same as in Example 1. Raise the temperature to 120°C and ventilate the reaction. Gas flow rate 3333mL / min, space velocity 5000h -1 . While the tail gas continuously passes through the catalyst bed, the water vapor as the regenerated detergent is also continuously passed into the catalyst bed from above. After the sulfur dioxide in the exhaust gas is removed by oxidation reaction, the regenerated detergent becomes dilute sulfuric acid. Dilute sulfuric acid is re-introduced into the catalyst bed. Experimental results: The steady-state desulfurization rate is 81%, and the final acid concentration reaches 25%.

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Abstract

The invention provides a method for treating claus technical tail gas. The method comprises the following steps of: continuously feeding the claus technical tail gas containing sulfur dioxide, oxygen and water into a reactor filled with a multihole carbon desulfurizing agent; generating catalytic oxidation reaction between the sulfur dioxide and the water in the tail gas on the surface of multihole carbon at the reaction temperature between 30 and 150 DEG C; and continuously introducing regenerative detergent into the reactor. By the method, adsorption, catalytic oxidation and desorption are synchronously carried out on low-concentration sulfur-containing waste gas in the claus technical tail gas which is difficult to treat; oxygen and water in the tail gas can be fully used; under the condition that oxygen is not required to be swelled and the water is not required to be compensated, standard discharging can be realized and sulfur resources can be recycled; an obtained by-product is dilute sulphuric acid which can be directly used in industrial production or used in the industrial production after being concentrated; the multihole carbon desulfurizing agent is low in cost and long in service life and can be recycled; the technical flow is simple, and the investment is low; and the running cost is competitive.

Description

technical field [0001] The invention belongs to the field of gas purification, in particular to a gas purification method using a catalytic method. Background technique [0002] Environmental pollution is one of the major problems facing mankind today. However, the discharge of sulfur compounds is particularly harmful to the environment, and it is the main factor that constitutes acid rain, which is generally valued by countries all over the world. [0003] The Claus process has become the standard process flow of the sulfur recovery industry since its invention, and it is also one of the most widely used sulfur recovery processes. However, due to the influence of chemical balance, the tail gas discharged from the Claus process still contains a high concentration of sulfur compounds such as sulfur dioxide. For example, the total sulfur recovery rate of the three-stage Claus is generally 94-96%, and the highest is 98%, which is far from meeting the environmental protection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/50B01D53/04C01B17/775
Inventor 王威宋夕平王伟
Owner BEIJING FUNGHAN ENG CONSULTING
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