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Toluene-containing tail gas recycling process in refractory mica tape production

A technology for refractory mica and tail gas recovery, applied in the fields of resource recycling and environmental protection, can solve problems such as inflammable, explosive, unsafe, and achieve the effect of solving production safety problems, simple treatment process and good absorption effect

Inactive Publication Date: 2013-06-12
扬州新奇特电缆材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for recovering toluene-containing tail gas in the production of refractory mica tape, which overcomes the flammability and explosion of organic solvents including diesel oil and the large insecurity in the production process in the existing absorption method. The present invention not only The toluene in the tail gas is effectively recovered, and the absorption liquid used in the recovery can be recycled, which effectively solves the environmental protection problem of the toluene-containing tail gas, and makes the toluene-containing tail gas meet the relevant emission standards

Method used

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  • Toluene-containing tail gas recycling process in refractory mica tape production

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Contains toluene 1250mg / m 3 The exhaust gas enters the absorption tower, with 9% (mass percentage) sodium citrate aqueous solution (adding sodium silicate in an appropriate amount), with 4.5kg 吸收液 / kg 气 At 40°C and 0.1MPa, the gas-liquid countercurrent contact is carried out to complete the toluene absorption process; after absorption by the absorption liquid, the toluene concentration in the toluene-removed gas is 42.3 mg / m 3 The toluene-containing absorption liquid enters the storage tank, and the toluene-containing absorption liquid is heated by a heater to enter the desorption tower for desorption, and the toluene-water azeotrope is obtained at the top of the desorption tower. Rich in toluene, toluene is obtained after drying; the desorbed absorption liquid enters the storage tank, and the absorption liquid is cooled by a cooler with a pump and then transported to the top of the absorption tower for absorption and reuse.

Embodiment 2

[0024] Contains toluene 850mg / m 3 The tail gas enters the absorption tower, with 5% (mass percentage) sodium acetate aqueous solution (adding appropriate amount of sodium p-toluene sulfonate), with 4.0kg 吸收液 / kg 气 The liquid-gas ratio, at 35°C and 0.1MPa, conduct gas-liquid countercurrent contact to complete the toluene absorption process; after absorption by the absorption liquid, the toluene concentration in the toluene-removed gas is 22.3 mg / m 3 The toluene-containing absorption liquid enters the storage tank, and the toluene-containing absorption liquid is heated by a heater to enter the desorption tower for desorption, and the toluene-water azeotrope is obtained at the top of the desorption tower. Rich in toluene, toluene is obtained after drying; the desorbed absorption liquid enters the storage tank, and the absorption liquid is cooled by a cooler with a pump and then transported to the top of the absorption tower for absorption and reuse.

Embodiment 3

[0026] Contains toluene 650mg / m 3 The tail gas enters the absorption tower, with 4% (mass percentage) sodium xylene sulfonate aqueous solution (sodium carbonate is added in an appropriate amount), with 3.6kg 吸收液 / kg 气 The liquid-to-gas ratio, at 25°C and 0.1MPa, conduct gas-liquid countercurrent contact to complete the toluene absorption process; after absorption by the absorption liquid, the toluene concentration in the toluene-removed gas is 16.3 mg / m 3 The toluene-containing absorption liquid enters the storage tank, and the toluene-containing absorption liquid is heated by a heater to enter the desorption tower for desorption, and the toluene-water azeotrope is obtained at the top of the desorption tower. Rich in toluene, toluene is obtained after drying; the desorbed absorption liquid enters the storage tank, and the absorption liquid is cooled by a cooler with a pump and then transported to the top of the absorption tower for absorption and reuse.

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Abstract

The invention relates to a toluene-containing tail gas recycling process in refractory mica tape production and belongs to the technical fields of resource recycling and environmental protection. Based on the conventional absorptive method, the toluene-containing tail gas recycling process is characterized in that an organic acid salt or inorganic acid (ether) salt aqueous solution is used as absorption liquid, so that the absorbing effect is better, the production safety problem of the conventional absorption method is effectively solved, toluene is recycled and the absorption liquid is recycled without generating secondary pollution; and the environmental protection problem of the toluene tail gas is solved and the toluene solvent is effectively recycled, therefore, the toluene-containing tail gas recycling process belongs to the energy-saving emission-reducing advantage project. The toluene-containing tail gas recycling process disclosed by the invention is simple; the treated tail gas reaches the national environmental protection emission requirements; the resources are saved; the toluene solvent is recycled; and the relevant national industrial polices for encouraging the chemical industries to save energy and reduce emission are satisfied. Besides, the toluene-containing tail gas not only can be used for recycling the toluene-containing tail gas in the refractory mica tape production, but also can be popularized to the recycling of toluene-containing tail gas in other fields.

Description

technical field [0001] The invention relates to a process for recovering tail gas containing toluene in the production of refractory mica tape, and belongs to the technical field of resource recycling and environmental protection. Background technique [0002] Toluene is used as a solvent in the production of refractory mica tape, and it needs to be dried in the end. Therefore, toluene volatilizes into the air of the workshop, which seriously affects the air quality and causes major environmental problems. If it is not recycled or treated, it will affect the production environment. Toluene, as a volatile organic compound (Voc), causes great harm to the environment, animals, plants, and human health. Toluene deep poisoning has a greater impact on the central nervous system, and there will be strong nerve excitement or inhibition, such as restlessness, daze, lethargy, etc. symptom. If toluene diffuses into the air, it will react photochemically with nitrogen oxides under the ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 唐崇书潘鹤林徐志珍张文清鲜金洪
Owner 扬州新奇特电缆材料有限公司
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