Activated Carbon In Fluidized Bed Adsorption Method

This section discusses a solvent recovery process developed by Kureha Engineering Co. Ltd., Japan.1 In this continuous process, spherical particles of activated carbon (AC) circulate in the adsorption and desorption columns by fluidization. In the adsorption column, the particles form fluidized beds on multi-trays to adsorb the solvent in counter-current contact with the feed gas. The cleaned gas is released from the top of the adsorption-column to the atmosphere.

The carbon absorber with adsorbed solvent is electrically heated (150-250°C) at the upper part of the desorption column and solvent is desorbed by nitrogen, which is supplied from the bottom of the desorption column. Nitrogen is continuously recycled in the desorption column. The solvent in the carrier gas is fed to a condenser for its recovery. Features of the process:

  • Atmospheric condensate is the only waste product because nitrogen (or air) is used as the carrier gas.
  • High flow rate per unit area because the process is conducted by fluidization.
  • Low thermal energy loss because both the adsorption and desorption are conducted at constant temperature.
  • Low electric energy consumption because the fluidization needs less blower driving power.

Figure 22.2.1 shows the process diagram and Table 22.2.1 shows application data.

Adsorption Column Flow Diagram
Figure 22.2.1. Flow diagram of the process.
Table 22.2.1. Application data. Activated carbon fluidized bed adsorption process

Solvents

Manufacturing plants

Flow rate, m3/min

Feed conc., ppm

phenol, naphthalene

semiconductors

50

100*

curry odor

food processing

240

4,000

IPA, phenol, acetone, ethanol

electronics

120

220

terpineol

IC

300

30

dichloromethane

semiconductors

80

500

IPA, xylene

semiconductors

150

110

IPA

semiconductors

80

200

manure odor

fertilizers

600

3,000*

phenol, formaldehyde, ammonia

shell mold casting

2,000

4

butyl acetate, IPA, etc.

semiconductors

420

50

terpineol

IC

300

30

butyl acetate, etc.

solvents

550

50

  • odor concentration
  • odor concentration

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