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Method for recovering toluene

A technology of toluene and exhaust gas, applied in the direction of adsorption purification/separation, organic chemistry, etc., can solve the problems of high cost, poor effect, low recovery rate, etc.

Inactive Publication Date: 2007-11-28
王少平
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the shortcomings of low recovery rate, high cost and poor effect in the existing methods for recovering toluene, the invention provides a method for recovering toluene

Method used

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  • Method for recovering toluene

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Embodiment Construction

[0041] As shown in Figure 1, the method for reclaiming toluene mainly comprises the following major steps:

[0042] 1. The waste gas generated in the production passes through the control valve and enters the gas filter first. The filter made of non-woven fabric separates impurities such as fibers and dust in the waste gas, so as to avoid blocking the cooler and activated carbon.

[0043] 2. After passing through the cooler, the cooler is composed of copper tubes and aluminum sheets. There is recyclable cooling water in the cooler to cool the waste gas including toluene gas. After the cooling water is cooled, the temperature of the waste gas is reduced from 76°C to Around 40°C, the lower temperature is conducive to the absorption of toluene by activated carbon.

[0044] 3. The cooled exhaust gas is pressurized by a high-pressure fan and enters three adsorption tanks respectively through the air supply duct. The adsorption tank is filled with activated carbon. Since the activat...

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Abstract

The recovery process includes the following steps: 1. making the produced waste gas pass through the control valve and filtering in the gas filter; 2. cooling waste gas including toluene in the cooler; 3. pressurizing with the high pressure blower and adsorbing with active carbon in three adsorbing tanks; 4. switching to desorption program through closing the waste gas valve and opening the steam valve for steam to enter the active carbon, with the toluene separated from the active carbon being exhausted together with the steam from the bottom of the adsorbing tanks; 5. condensing the steam with toluene gas to form mixture liquid of toluene and water; 6. separating the mixture liquid of light toluene and heavy water in a separator; and 7. storing toluene in a tank. The process has toluene recovering rate over 86 % and low cost.

Description

technical field [0001] The invention relates to a method for recovering toluene, in particular to a method for adsorbing toluene by using activated carbon. Background technique [0002] Toluene is an organic compound, an aromatic hydrocarbon, with the molecular formula C 6 h 5 CH 3 , Toluene is liquid at room temperature, colorless and flammable. Its boiling point is 110.8°C, its freezing point is -95°C, and its density is 0.866 g / cm 3 . Its freezing point is lower than that of water, and its boiling point is higher than that of water. Toluene is insoluble in water, but soluble in solvents such as ethanol and benzene. The vapor of toluene is poisonous and can cause harm to the human body through the respiratory tract. It should be prevented from entering the respiratory organs during use and production. However, existing methods for recovering toluene have defects such as low recovery rate, high cost, and poor effect. Contents of the invention [0003] In order to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/12C07C15/06
Inventor 林文默
Owner 王少平
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