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Continuously absorbing and rectifying organic waste recovering method

A technology of organic waste gas and recovery method, applied in chemical instruments and methods, separation methods, vapor condensation and other directions, can solve the problems of large consumption, large energy, consumption, etc., and achieve the effects of convenient operation, high recovery rate and energy saving

Active Publication Date: 2007-10-17
武汉旭日华环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following defects: 1. It is first necessary to cool the desorption vapor into a liquid phase, thereby consuming a large amount of energy
2. During the rectification process, a large amount of energy is consumed to heat and vaporize the aqueous solution
3. It needs to invest in a heat exchanger with a large heat exchange area
If the desorption steam directly enters the rectification tower without condensation, since the desorption steam enters the early stage of the adsorber, air remains in the adsorber, resulting in a large amount of non-condensable air in the desorption steam, which will affect the separation of vapor and liquid, resulting in continuous rectification.

Method used

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  • Continuously absorbing and rectifying organic waste recovering method
  • Continuously absorbing and rectifying organic waste recovering method
  • Continuously absorbing and rectifying organic waste recovering method

Examples

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Effect test

Embodiment 1

[0010] Example 1, the ethanol waste gas discharged by a printing enterprise, the air volume is 12000m 3 / h, concentration 10g / m 3 , carry out adsorption recovery with activated carbon fiber, design four adsorption boxes (using 640kg activated carbon fiber, each adsorption box is filled with 160kg activated carbon fiber. According to the original process, two adsorption boxes are designed, and each adsorption box uses 320kg activated carbon fiber), ), the steam used for desorption is 300kg / h, and the desorption steam directly enters a ¢500×12000 rectification tower, and after rectification, ethanol with a content meeting the production requirements is obtained, saving more than 300kg of steam per hour, and saving 160m of circulating cooling water 3 / h.

Embodiment 2

[0011] Example 2, the methanol waste gas discharged by a chemical enterprise, the air volume is 1500m 3 / h, concentration 45g / m 3 , four adsorbers are designed with activated carbon fiber adsorption and recovery, each adsorber is filled with 80kg activated carbon fiber, the adsorption time is 20min, the desorption time is 10min, the drying time is 5min, the desorption air discharge time is 3min, the intermittent time is 2min, and the desorption steam directly enters the packing rectification More than 99% of the methanol obtained through column rectification can be reused in production.

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PUM

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Abstract

The invention relates to an organic exhaust gas recovery method, especially to an organic exhaust gas recovery method of continuous adsorption and rectification. The method is sent the organic exhaust gas in to the activated carbon fibre absorber, and the resolution steam enters a three way auto valve directly where the temperature sensor is mounted and which is controlled by the temperature sensor. The resolution steam enters rectification tower directly to be rectified when the temperature is higher than 100 degree C, and when the temperature is lower than 100 degree C, the resolution steam with noncondensing air is condensed into a condensator, wherein the condensate is continuously pumped into rectification tower and the noncondensing air is re-absorbed back to the absorber. The invention has the advantage of a simple process and a convenient operation, also be capable of continuous adsorption and rectification, has a high rate of recovery in organic solvent, and saves energy sources.

Description

technical field [0001] The invention relates to a method for recovering organic waste gas, in particular to a method for recovering organic waste gas by continuous adsorption and rectification. Background technique [0002] In the printing, coating and other industries, printing inks and glues contain a large amount of organic solvents. After printing and coating, the printing paper and coating are generally dried in an oven, the paper or coating is transported to the drying oven, and then the hot air is sent to the dryer by the blower for drying. During the drying process, the organic solvent generates a large amount of organic waste gas after being heated by the oven. For these organic waste gases, the activated carbon fiber adsorber is generally used to absorb and recover them and then desorb them. During desorption, water vapor is used for desorption, and the desorption steam is cooled by a condenser to form an aqueous solution, and the aqueous solution enters a rectif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/72B01D53/81B01D5/00
Inventor 杨旭东肖华青范飞飞贺涛
Owner 武汉旭日华环保科技股份有限公司
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