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Gas purification device and method

A gas purification device and gas technology, applied in the direction of chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of safety, flow obstruction of adsorbents, reduction of chemical substance removal rate, etc., and achieve high removal rate, inhibition Coagulation, flow stabilization effect

Active Publication Date: 2015-08-19
KUREHA ECOLOGY MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the flow of the adsorbent is hindered, which will cause insufficient regeneration of the adsorbent, and there is a problem that the removal rate of the chemical substances contained in the discharged gas is reduced, and at the same time, it is easy for air to invade the adsorbent regeneration part in a high-temperature state from the outside. , there is a security problem
[0005] Furthermore, chemical substances adsorbed on the adsorbent, especially easily decomposed chemical substances such as ethyl acetate, will decompose (hydrolyze) when heated for a long time, and there is a problem that the recovered chemical substances are mixed with decomposition products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (Example 1, Comparative Examples 1-2)

[0085] use figure 1 The shown gas purification device having an adsorption unit, a desorption unit, and an adsorbent temperature control unit is used to purify the exhaust gas containing ethyl acetate. As the adsorbent, spherical activated carbon G-BAC manufactured by KLEHA Co., Ltd. was used. In addition, nitrogen was used as the noncondensable gas in convective contact with the downflowing adsorbent. Adsorbent temperature control department such as figure 1 As shown, a heater 7 composed of a resistance exothermic body and a temperature detector (not shown) for measuring the temperature of the adsorbent passing through the heater 7 and flowing downward are constituted. In addition, the dew point of the non-condensable gas Ga containing chemical substances was obtained by a gas-liquid equilibrium test. Table 1 shows the temperature of the downflowing adsorbent in each example. In addition, the composition of the non-condensab...

Embodiment 2、 comparative example 3～4

[0090] Purification was performed in the same manner as in Example 1, except that the dew point of the non-condensable gas Ga containing chemical substances was obtained by calculation, using off-gas containing n-propyl acetate instead of off-gas containing ethyl acetate.

[0091] As a result of the test, as shown in Comparative Example 4 in Table 2, in the case where the temperature of the adsorbent flowing downward is lower than the dew point (95° C.) of the non-condensable gas containing n-propyl acetate, the flow of the adsorbent unstable. In addition, as shown in Comparative Example 3, in the case where the temperature of the downward-flowing adsorbent is higher than the dew point + 50° C., compared with Example 2, the concentration of acetic acid contained in the recovered n-propyl acetate is greatly increased, and the recovered The purity of the substance is reduced.

[0092] [Table 2]

[0093]

Embodiment 3、 comparative example 5～6

[0095] Purification was performed in the same manner as in Example 2, except that the exhaust gas containing MEK (methyl ethyl ketone) was used instead of the exhaust gas containing n-propyl acetate.

[0096] As a result of the test, as shown in Comparative Example 6 in Table 3, in the case where the temperature of the adsorbent flowing downward was lower than the dew point (95° C.) of the non-condensable gas containing MEK, the flow of the adsorbent was unstable. Furthermore, as shown in Comparative Example 5, in the case where the temperature of the downflowing adsorbent was higher than the dew point + 50° C., the concentration of impurities contained in the recovered MEK was greatly increased compared with Example 3.

[0097] [table 3]

[0098]

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PUM

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Abstract

A device and method for purifying a gas are provided in which a chemical substance is inhibited from condensing on the surface of an adsorbent falling gravitationally, whereby the flow of the adsorbent is stabilized and the adsorbent is satisfactorily regenerated.  Also provided are the gas purifier and gas purification method in which a chemical substance, e.g., ethyl acetate, is inhibited from decomposing and the chemical substance having a high purity can be recovered. The gas purifier (1) has: an adsorption part (A) in which a gas (G) containing a chemical substance is brought into contact with an adsorbent (K) to adsorb the chemical substance onto the adsorbent (K); and a desorption part (D) in which a non-condensable gas (Ga) is brought into countercurrent contact with the adsorbent (K) which is descending via the adsorption part (A) while forming a moving layer, whereby the chemical substance is desorbed from the adsorbent (K).  The gas purifier (1) further has an adsorbent-temperature control part (C) disposed between the adsorption part (A) and the desorption part (D) and for keeping the descending adsorbent (K) at a temperature between the dew point of the chemical-substance-containing non-condensable gas (Ga) which has passed through the desorption part (D) and [(the dew point) + 50ºC].

Description

technical field [0001] The present invention relates to gas purification apparatus and methods. In particular, it relates to a gas purification device and a purification method for recovering organic solvents contained in exhaust gas and removing harmful and malodorous substances. Background technique [0002] A gas purification device (gas treatment device) is known that removes solvent components such as harmful odorous substances and organic solvents contained in factory exhaust gas by adsorption and removal using solid adsorbent particles to purify the gas and recover the solvent components. [0003] Patent Document 1 discloses a gas treatment device in which solid adsorbent particles are continuously supplied to a gas-to-be-treated adsorption section of the gas treatment device, and the adsorbent particles adsorbing a solvent component in the gas-to-be-treated adsorption section are The adsorbent particles are regenerated while flowing downward by gravity toward the ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/44B01D53/08B01D53/81
CPCB01D2257/708B01D53/08B01D2257/704
Inventor 蛭田一雄渡边幸夫佐藤克史坂口雅也大山宏树
Owner KUREHA ECOLOGY MANAGEMENT
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