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Method for commissioning adsorbent bed in acetone recycling process

An adsorption bed and acetone technology, which is applied in separation methods, chemical instruments and methods, separation/purification of carbonyl compounds, etc., can solve the problems of affecting the adsorption capacity of activated carbon, large economic losses, and slow water velocity, so as to improve the ability to adsorb acetone , Reduce acetone emission, reduce the effect of water content

Active Publication Date: 2014-03-26
KUNMING CELLULOSE FIBERS CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the adsorption bed is maintained or the activated carbon of the adsorption bed is replaced, it is necessary to withdraw the adsorption bed and soak the activated carbon with water. It enters the adsorption process after one hour. During the adsorption process, it enters the secondary cooler through the primary cooler. The VLA temperature at the outlet of the secondary cooler is usually 40°C. This process condition is due to the slow removal of moisture in the activated carbon, and the moisture in the activated carbon affects the activated carbon. Adsorption capacity, the acetone content in the tail gas will be very high within a week or so after it is put into operation, causing a large amount of acetone to be discharged, resulting in large economic losses

Method used

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  • Method for commissioning adsorbent bed in acetone recycling process

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Embodiment 1

[0016] When the adsorption bed is maintained or the activated carbon of the adsorption bed is replaced, the adsorption bed is withdrawn, and the activated carbon is soaked with water. After the maintenance operation is completed, the adsorption bed is put into operation. When the adsorption bed is a region, proceed as follows:

[0017] 1. The adsorption bed is put into operation for analysis, and the steam is introduced at a flow rate of 7 tons / hour for 1.5 hours (at this time, close the VLA inlet valve of the adsorption bed, close the tail gas valve, and open the analysis steam valve and steam valve);

[0018] 2. After the analysis of the operation is completed, the acetone-air mixture enters the secondary cooler through the primary cooler, and the temperature of the acetone-air mixture at the outlet of the secondary cooler is controlled to be 43°C, and then the acetone-air mixture enters the adsorption bed for activated carbon adsorption 56 minutes;

[0019] 3. After the ads...

Embodiment 2

[0021] In the case of multiple adsorption beds (about 10), it can be divided into two areas, and the operation of the adsorption beds is carried out as follows:

[0022] 1. Analysis of the operation of the adsorption bed in the area containing the newly put into operation adsorption bed. The steam is introduced at a flow rate of 9 tons / hour for 1 hour (at this time, close the VLA inlet valve of the adsorption bed, close the tail gas valve, and open Analyzing steam valves and steam valves);

[0023] 2. After the operation analysis is completed, the acetone-air mixture enters the secondary cooler through the primary cooler, and the temperature of the acetone-air mixture at the outlet of the secondary cooler is controlled at 44°C, and the acetone-air mixture of the secondary cooler in another area The gas outlet temperature is 41°C, and then the acetone-air mixture enters the adsorption bed for activated carbon adsorption for 60 minutes;

[0024] 3. The steps are the same as in ...

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Abstract

The invention relates to a method for commissioning an adsorbent bed in an acetone recycling process, which comprises the following steps: 1) carrying out commissioning resolution on an adsorbent bed, introducing steam at a flow rate of 7-9 tons / hour for 1-1.5 hours; 2) after the commissioning resolution is completed, introducing acetone / air mixed gas into a secondary cooler through a primary cooler, and enabling the temperature of the acetone / air mixed gas at the outlet of the secondary cooler to be 42-44 DEG C; and 3) after the adsorption of activated carbon is completed, carrying out resolution, and introducing steam into the adsorbent bed at a flow rate of 12 tons / hour for 11-16 minutes to resolve acetone; when the acetone content of tail gas is lower than 45PPM, gradually reducing the flow rate of the steam until the corresponding acetone content of the tail gas is 40-45PPM; and recovering a normal operation level. The method provided by the invention can improve the acetone adsorption capability of the activated carbon, reduce the acetone content in the tail gas and reduce the emission of acetone.

Description

technical field [0001] The invention relates to the technical field of cellulose acetate manufacture, in particular to a method for putting into operation an activated carbon adsorption bed soaked in water in an acetone recovery process. Background technique [0002] The adsorption bed is a main equipment in the acetone recovery process of the acetate fiber manufacturing industry. It relies on activated carbon to adsorb acetone in the acetone-air mixture, and then resolves the acetone in the activated carbon through steam, and forms diacetone after condensation and cooling to achieve the purpose of recovery. The specific process is as figure 1 Shown: VLA (acetone-air mixture) enters the adsorption bed from the top of the adsorption bed through the primary and secondary coolers, and after passing through the activated carbon layer in the adsorption bed, acetone is absorbed by the activated carbon, and the air containing traces of acetone is discharged from the tail gas; Afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02C07C49/08C07C45/81
Inventor 王学俊徐兴文李海彦张俊刘铭伍健朱临喜
Owner KUNMING CELLULOSE FIBERS CO LTD
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