Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols, (recovery of volatile solvents by condensation B01D5/00; sublimation B01D7/00; cold traps, cold baffles B01D8/00; working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00; cleaning coal gas C10K; working-up of natural gas, or synthetic natural gas, C10L3/10; separation of difficult-to-condense gases or air by liquefaction F25J; for investigating materials G01N30/00)

Child Classifications

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• B01D 53/002
• B01D 53/005
• B01D 53/007
• B01D 53/02 by adsorption, e.g. preparative gas chromatography
• B01D 53/14 by absorption
• B01D 53/22 by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00)
• B01D 53/24 by centrifugal force (centrifuges B04B; cyclones B04C)
• B01D 53/26 Drying gases or vapours
• B01D 53/30 Controlling by gas-analysis apparatus (regulating non electrical variables in general G05D)
• B01D 53/32 by electrical effects other than those provided for in group B01D61/00
• B01D 53/34 Chemical or biological purification of waste gases