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Device and operation method for removing malodorous gas such as methyl mercaptan by chlorine dioxide

A technology of chlorine dioxide and malodorous gas, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, which can solve the problem of high processing costs, the absence of chlorine dioxide to remove the odorous gas of methyl mercaptan, and the inability to remove odorous substances, etc. problems, to achieve low operating costs and equipment investment, easy operation, and high safety effects

Inactive Publication Date: 2013-06-19
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon adsorption tower method has a simple structure and can adsorb a variety of odorous substances at the same time. The disadvantage is that it is only suitable for low-concentration odors, and the activated carbon needs to be replaced. The treatment cost is high and the odorous substances cannot be completely removed.
[0007] At present, there is no relevant report on the use of chlorine dioxide to remove the odorous gas of methyl mercaptan

Method used

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  • Device and operation method for removing malodorous gas such as methyl mercaptan by chlorine dioxide
  • Device and operation method for removing malodorous gas such as methyl mercaptan by chlorine dioxide
  • Device and operation method for removing malodorous gas such as methyl mercaptan by chlorine dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1) Measure 1000ml of absolute ethanol into the separatory funnel of the tail gas absorption tower; add 150ml of 5g / L NaOH and 5g / L NaOH into the alkali absorption tower 2 S mixed lye absorption liquid; 7.0g / L chlorine dioxide solution required for the reaction was added to the chlorine dioxide solution separatory funnel, wherein the molar ratio of chlorine dioxide solution to methyl mercaptan was 2:1.

[0037] 2) Open the intake switch of the compressed air first, and control the flow rate of the compressed air to 0.6m 3 / h, dehydrated alcohol is flowed in the methyl mercaptan absorption tower with the flow velocity of 250ml / min simultaneously, and mixed lye absorption liquid is flowed in the alkali absorption tower with the flow velocity of 40ml / min; The temperature of control odor reactor is 40 ℃, The pH of the chlorine dioxide solution is 2, then open the switch of the chlorine dioxide solution separating funnel, after the chlorine dioxide solution enters the reactor...

Embodiment 2

[0039] 1) Measure 1000ml of absolute ethanol into the separatory funnel of the tail gas absorption tower; add 150ml of 5g / L NaOH and 5g / L NaOH into the alkali absorption tower 2 S mixed lye absorption solution; 7.0g / L chlorine dioxide solution required for the reaction was added to the chlorine dioxide solution separatory funnel, wherein the molar ratio of chlorine dioxide solution to methyl mercaptan was 2.5:1.

[0040] 2) Turn on the intake switch of the compressed air first, and control the flow rate of the compressed air to 0.8m 3 / h, dehydrated alcohol is flowed in the methyl mercaptan absorption tower with the flow velocity of 250ml / min simultaneously, and mixed lye absorption liquid is flowed in the alkali absorption tower with the flow velocity of 40ml / min; Control odor reactor temperature is 30 ℃, two The pH of the chlorine dioxide solution is 3, and then the switch of the chlorine dioxide solution separating funnel is opened, so that the chlorine dioxide solution ent...

Embodiment 3

[0042] 1) Measure 1000ml of absolute ethanol into the separatory funnel of the tail gas absorption tower; add 150ml of 5g / L NaOH and 5g / L NaOH into the alkali absorption tower 2 S mixed lye absorption solution; 7.0g / L chlorine dioxide solution required for the reaction was added to the chlorine dioxide solution separatory funnel, wherein the molar ratio of chlorine dioxide solution to methyl mercaptan was 2.3:1.

[0043] 2) Turn on the intake switch of the compressed air first, and control the flow rate of the compressed air to 0.72m 3 / h, dehydrated alcohol is flowed in the methyl mercaptan absorption tower with the flow velocity of 250ml / min simultaneously, and the mixed lye absorption liquid is flowed in the alkali absorption tower with the flow velocity of 40ml / min; The control odor reactor temperature is 35 ℃, two The pH of the chlorine dioxide solution is 4, then open the switch of the chlorine dioxide solution separating funnel, after the chlorine dioxide solution enter...

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Abstract

The invention discloses a device and an operation method for removing malodorous gas such as methyl mercaptan by chlorine dioxide. The device mainly comprises a chlorine dioxide atomization device, a malodorous gas reactor, an alkali absorption tower and a tail gas absorption tower. The bottom of the malodorous gas reactor is provided with the chlorine dioxide atomization device and is connected to a methyl mercaptan standard gas cylinder by a pipe. The top of the malodorous gas reactor is connected to the bottom of the alkali absorption tower by a pipe. The top of the alkali absorption tower is connected to an absorption liquid separating funnel and is connected to the bottom of the tail gas absorption tower. The top of the tail gas absorption tower is connected to an anhydrous ethanol separating funnel and a gas discharge pipe. The operation method comprises that chlorine dioxide and malodorous gas such as methyl mercaptan undergo a reaction in the malodorous gas reactor; and the reaction product passes through the alkali absorption tower and is absorbed by the tail gas absorption tower so that malodorous gas removal is realized. The alkali absorption waste liquid can be fed back to a sulfur cycle process of a sulfate pulping factory so that the waste is changed into values and current green papermaking requirements are satisfied.

Description

technical field [0001] The invention belongs to the technical field of malodorous gas absorption, in particular to a device and an operation method for removing methylmercaptan malodorous gas with chlorine dioxide. Background technique [0002] Methyl mercaptan is one of the four odor pollutants produced in the production process of kraft pulp mills, and it is also a typical atmospheric odor pollutant. Its chemical formula is CH 3 sh. The boiling point of methyl mercaptan is 6.8°C, it is a colorless gas at room temperature, it has a strong smell of stinky cabbage leaves, and its smell threshold is 0.15 μg / m 3 (less than 1ppbv), easily perceived by people; methyl mercaptan is insoluble in water, but soluble in organic solvents such as ethanol and benzene. In addition, it is a kind of neurotoxin, which has a strong stimulating effect on the mucous membrane of the human body and causes damage to the brain and respiratory system of the human body. In view of the various hazar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/48
Inventor 宋雪萍黄显南林积圳吴敏覃程荣刘新亮卫威朱红祥骆莲新
Owner GUANGXI UNIV
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