B
SECTION B — PERFORMING OPERATIONS; TRANSPORTING
  
SEPARATING AND MIXING
 B01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL (furnaces, kilns, ovens, retorts, in general F27)
 B01D
SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation B03C; centrifuges, vortex apparatus B04)
 B01D

Note(s)

  1. The processes covered by this sub-class include evaporation, distillation, crystallisation, filtration, dust precipitation, gas cleaning, absorption, adsorption.
  2. This sub-class also includes similar processes which are not concerned with, or limited to, separation (except in the case of absorption or adsorption).
  3. The word "filtration" and related words should be interpreted as embracing straining liquids from solids.
  4. For apparatus used in drying or evaporation, F26 takes precedence over B01D.
  5. When considering the sub-divisions of this sub-class, it should be borne in mind that group B01D 59/00 takes precedence over the other groups of this sub-class and over other sub-classes.
 B01D 1/00
Evaporating (removal of incrustation B08B; sugar or starch industry C13; prevention of incrustation C23F; drying solid materials or objects by evaporating liquids therefrom F26)
 B01D 1/02
·  Evaporators with heating coils
 B01D 1/04
·  Evaporators with horizontal tubes
 B01D 1/06
·  Evaporators with vertical tubes
 B01D 1/08
·  ·  with short tubes (B01D 1/12 takes precedence)
 B01D 1/10
·  ·  with long tubes, e.g. Kestner evaporators (B01D 1/12 takes precedence)
 B01D 1/12
·  ·  and forced circulation
 B01D 1/14
·  with heated gases or vapours in contact with the liquid
 B01D 1/16
·  by spraying (B01D 1/22 takes precedence)
 B01D 1/18
·  ·  to obtain dry solids (B01D 1/24 takes precedence)
 B01D 1/20
·  ·  Sprayers (in general B05B)
 B01D 1/22
·  by bringing a thin layer of the liquid into contact with a heated surface
 B01D 1/24
·  ·  to obtain dry solids
 B01D 1/26
·  Multiple-effect evaporating
 B01D 1/28
·  with vapour compression
 B01D 1/30
·  Accessories for evaporators
 B01D 3/00
Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping (gas chromatography B01D 15/08; destructive distillation C10B)  [2]
 B01D 3/02
·  in boilers or stills  [2]
 B01D 3/04
·  pipe stills
 B01D 3/06
·  Flash distillation  [2]
 B01D 3/08
·  in rotating vessels; Atomisation on rotating discs (B01D 3/10 takes precedence)
 B01D 3/10
·  Vacuum distillation (B01D 3/12 takes precedence)  [2]
 B01D 3/12
·  Molecular distillation  [2]
 B01D 3/14
·  Fractional distillation
 B01D 3/16
·  ·  Fractionating columns in which vapour bubbles through liquid (loose filling elements B01D 53/20)
 B01D 3/18
·  ·  ·  with horizontal bubble plates
 B01D 3/20
·  ·  ·  ·  Bubble caps; Risers for vapour; Discharge pipes for liquid
 B01D 3/22
·  ·  ·  with horizontal sieve plates or grids; Construction of sieve plates or grids
 B01D 3/24
·  ·  ·  with sloping plates or elements mounted stepwise
 B01D 3/26
·  ·  Fractionating columns in which vapour and liquid flow pass each other, or in which the fluid is sprayed into the vapour, or in which a two-phase mixture is passed in one direction
 B01D 3/28
·  ·  ·  Fractionating columns with surface contact and vertical guides, e.g. film action
 B01D 3/30
·  ·  Fractionating columns with movable parts or in which centrifugal movement is caused
 B01D 3/32
·  ·  Other features of fractionating columns
 B01D 3/34
·  with one or more auxiliary substances
 B01D 3/36
·  ·  Azeotropic distillation
 B01D 3/38
·  ·  Steam distillation
 B01D 3/40
·  ·  Extractive distillation
 B01D 3/42
·  Regulation; Control
 B01D 5/00
Condensation of vapours; Recovering volatile solvents by condensation (B01D 8/00 takes precedence; condensers F28B)
 B01D 7/00
Sublimation (B01D 8/00 takes precedence; freeze-drying F26)
 B01D 7/02
·  Crystallisation directly from the vapour phase (into single crystals C30B 23/00)  [2]
 B01D 8/00
Cold traps; Cold baffles (pumps for evacuating by condensing or freezing F04B 37/08)  [3]
 B01D 9/00
Crystallisation (crystallisation directly from the vapour phase B01D 7/02; making single crystals C30B)
 B01D 9/02
·  from solutions
 B01D 9/04
·  ·  concentrating solutions by removing frozen solvent therefrom
 B01D 11/00
Solvent extraction
 B01D 11/02
·  of solids
 B01D 11/04
·  of solutions which are liquid
 B01D 12/00
Displacing liquid, e.g. from wet solids or from dispersions of liquids or from solids in liquids, by means of another liquid
 B01D 13/00
Processes of separation employing semi-permeable membranes, e.g. dialysis, osmosis
 B01D 13/02
·  Electrodialysis; Electro-osmosis
 B01D 13/04
·  Special methods for the production of semi-permeable membranes (manufacture of films of plastics C08J 5/18, B29; manufacture of parchmentised paper D21)
 B01D 15/00
Separating processes involving the treatment of liquids with adsorbents (ion exchange processes, absorption or adsorption in general B01J)
 B01D 15/02
·  with moving adsorbents
 B01D 15/04
·  with ion-exchange materials as adsorbents
 B01D 15/06
( transferred to B01J )
 B01D 15/08
·  Selective adsorption; Chromatography
 B01D 17/00
Separation of liquids, not provided for elsewhere, e. g by thermal diffusion (devices for separating or removing fatty or oily substances or similar floating material from water, waste water, or sewage C02F 1/40)
 B01D 17/02
·  Separation of non-miscible liquids
 B01D 17/04
·  ·  Breaking emulsions
 B01D 17/06
·  Separation of liquids from each other by electricity (electrostatic separation B03C)
 B01D 17/08
·  Thickening liquid suspensions by filtration
 B01D 17/10
·  ·  with stationary filtering elements
 B01D 19/00
Degasification of liquids
 B01D 19/02
·  Foam dispersion or prevention (during boiling B01B 1/02; during fermentation C12)
 B01D 19/04
·  ·  by addition of chemical substances
 B01D 21/00
Separation of suspended particles from liquids by sedimentation (differential sedimentation B03D 3/00)
 B01D 21/01
·  using flocculating agents (for purifying water C02F 1/52; for liquid radioactive waste G21F 9/10)  [2]
 B01D 21/02
·  Settling tanks with single outlets for the separated liquid
 B01D 21/04
·  ·  with moving scrapers
 B01D 21/06
·  ·  ·  with rotating scrapers
 B01D 21/08
·  ·  provided with flocculating compartments
 B01D 21/10
·  Settling tanks with multiple outlets for the separated liquids
 B01D 21/12
·  ·  with moving scrapers
 B01D 21/14
·  ·  ·  with rotating scrapers
 B01D 21/16
·  ·  provided with flocculating compartments
 B01D 21/18
·  Construction of the scrapers or the driving mechanisms for settling tanks
 B01D 21/20
·  ·  Driving mechanisms
 B01D 21/22
·  ·  Safety mechanisms
 B01D 21/24
·  Feed or discharge mechanisms for settling tanks
 B01D 21/26
·  Separation of sediment aided by centrifugal force (centrifuges B04B; cyclones B04C)
 B01D 23/00 - 
B01D 41/00
Filtration; Filtering material, regeneration thereof (screens or sieves per se B07B 1/00)
 B01D 23/00
Gravity filters (with moving filtering elements B01D 33/18)
 B01D 23/02
·  with fixed filter bodies
 B01D 23/04
·  ·  with filter bags filtering from the inside
 B01D 23/06
·  ·  with rigid tubular bodies
 B01D 23/08
·  ·  with saucer-shaped filtering elements
 B01D 23/10
·  with loose filter material
 B01D 23/12
·  ·  with filtering material supported on louvred sides
 B01D 23/14
·  ·  Carbon filters
 B01D 23/16
·  ·  Sand or gravel filters
 B01D 23/18
·  ·  Bottoms of filter beds
 B01D 23/20
·  Feed or discharge devices (nozzles B05B)
 B01D 23/24
·  Regeneration of the filter material in the filter
 B01D 23/26
·  integrally combined with devices for controlling the filtration
 B01D 23/28
·  Filter funnels; Holders therefor (funnels in general B67C)
 B01D 25/00
Filters formed by clamping together several filtering elements or parts of such elements
 B01D 25/02
·  in which the elements are pre-formed independent filtering units
 B01D 25/04
·  with screens or sheets, e.g. cloths, paper (B01D 25/12 takes precedence)
 B01D 25/06
·  with loose, granular or fibrous filtering material
 B01D 25/08
·  with rigid self-supporting filtering elements
 B01D 25/10
·  in which the suspended particles form the filtering medium
 B01D 25/12
·  Filter presses, i.e. of the plate or plate and frame type
 B01D 25/14
·  ·  Clamping means
 B01D 25/16
·  Edge filters, i.e. using contiguous impervious surfaces
 B01D 25/18
·  ·  filtering between the edges of flat stacked bodies
 B01D 25/20
·  ·  filtering between the windings of helically wound elements
 B01D 25/22
·  Cell-type filters
 B01D 25/24
·  ·  Cell-type roll filters
 B01D 25/26
·  ·  Cell-type stack filters
 B01D 25/28
·  Leaching or washing filter cakes in the filter
 B01D 25/30
·  Feeding devices
 B01D 25/32
·  Removal of filter cakes
 B01D 25/34
·  ·  by moving the filter elements
 B01D 25/36
·  ·  ·  by centrifugal force
 B01D 25/38
·  ·  by moving parts, e.g. scrapers, contacting stationary filter elements
 B01D 27/00
Cartridge filters
 B01D 27/02
·  with cartridges made from a mass of loose material
 B01D 27/04
·  with cartridges made of a piece of unitary material, e.g. filter paper
 B01D 27/06
·  ·  with folds or corrugations
 B01D 27/08
·  Construction of the casing
 B01D 27/10
·  Safety devices, e.g. by-passes (by-passes in general B01D 35/14)
 B01D 27/12
·  Regeneration
 B01D 29/00
Other pressure filters with filtering elements which are stationary during filtration
 B01D 29/02
·  in which the filtering elements are moved between filtering operations
 B01D 29/04
·  with screens or sheets, e.g. cloth, paper
 B01D 29/06
·  ·  with corrugated, folded, or wound sheets
 B01D 29/08
·  with loose, granular, or fibrous filtering material
 B01D 29/10
·  Bag, cage, hose, tube, sleeve, or like filters
 B01D 29/12
·  ·  having flexible filtering material
 B01D 29/14
·  ·  ·  which is supported
 B01D 29/16
·  ·  ·  ·  on solid frames with surface grooves and the like
 B01D 29/18
·  ·  ·  ·  to take up a concertina shape during filtration
 B01D 29/20
·  ·  having rigid self-supporting filtering material
 B01D 29/22
·  ·  ·  by edge filtration, i.e. using contiguous impervious surfaces (with mechanical pressure B01D 25/16)
 B01D 29/24
·  ·  with multiple filtering units
 B01D 29/26
·  ·  ·  arranged concentrically
 B01D 29/28
·  ·  which are vibrated
 B01D 29/30
·  ·  which are open-ended
 B01D 29/32
·  ·  Filter candles
 B01D 29/34
·  with hollow discs side-by-side on or around one or more tubes
 B01D 29/36
·  integrally combined with devices for controlling the filtration
 B01D 29/38
·  Regeneration of the filtering material in the filter
 B01D 29/40
·  ·  by centrifugal force
 B01D 29/42
·  having feed or discharge devices
 B01D 31/00
Ultra-filters
 B01D 31/02
·  Electric ultra-filters (electrostatic separation B03C)
 B01D 33/00
Filters with filtering elements which move during the filtering operation
 B01D 33/02
·  with rotating filtering surfaces
 B01D 33/04
·  ·  with filtering bands and the like supported on non-filtering cylinders
 B01D 33/06
·  ·  with cylindrical filtering surfaces, e.g. hollow drums
 B01D 33/08
·  ·  ·  Drums provided with cells each independently connected with pressure distributor
 B01D 33/10
·  ·  ·  Drums with a single compartment
 B01D 33/12
·  ·  ·  combined with filtering bands and the like
 B01D 33/14
·  ·  ·  ·  with endless filtering bands
 B01D 33/16
·  ·  ·  with loose, granular, or fibrous filtering material
 B01D 33/18
·  ·  ·  Gravity filters
 B01D 33/20
·  ·  ·  ·  with external feed
 B01D 33/22
·  ·  with plane surfaces
 B01D 33/24
·  ·  ·  with rotary tables
 B01D 33/26
·  ·  ·  with hollow discs transversely mounted on a hollow shaft
 B01D 33/28
·  ·  ·  with hollow frames axially mounted on a hollow shaft
 B01D 33/30
·  ·  ·  with loose, granular, or fibrous filtering material
 B01D 33/32
·  ·  with filtering surfaces travelling along conveyers (tipping bucket type B01D 35/08)
 B01D 33/34
·  Accessories
 B01D 33/36
·  ·  Devices for handling the filter cake
 B01D 33/38
·  ·  Feed or discharge devices for liquids
 B01D 33/40
·  ·  Pressure distribution systems
 B01D 35/00
Other filtering devices; Auxiliary devices for filtration (filtering material B01D 39/00; devices specially adapted for filtering gases B01D 46/00)
 B01D 35/02
·  Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
 B01D 35/04
·  ·  Plug, tap, and cock filters
 B01D 35/06
·  Filters making use of electricity or magnetism (electric ultra-filters B01D 31/02; devices comprising filters and magnetic separators B03C 1/30)
 B01D 35/08
·  Filters with tipping buckets or trays
 B01D 35/10
·  Brush filters
 B01D 35/12
·  Devices for taking out of action one or more units of multi-unit filters, e.g. for regeneration
 B01D 35/14
·  Safety devices specially adapted for filtration (preventing or minimising fires or explosions A62C); Devices for indicating clogging
 B01D 35/16
·  Cleaning-out devices
 B01D 35/18
·  Heating or cooling the filters
 B01D 35/20
·  Vibrating the filters
 B01D 35/22
·  Directing the mixture to be filtered on to the filters in a manner to clean the filters
 B01D 35/24
·  Providing loose granular material to scratch the filters clean
 B01D 35/26
·  Filters with built-in pumps
 B01D 35/28
·  Strainers not provided for elsewhere
 B01D 37/00
Processes of filtration (processes specially adapted for filtering gases B01D 46/00)
 B01D 37/02
·  Precoating the filter medium; Addition of filter aids to the liquid being filtered
 B01D 37/04
·  Controlling the filtration
 B01D 39/00
Filtering material for liquid or gaseous fluids (materials per se, see the relevant classes)
 B01D 39/02
·  Loose filtering material, e.g. loose fibres
 B01D 39/04
·  ·  Organic material, e.g. cellulose, cotton
 B01D 39/06
·  ·  Inorganic material, e.g. asbestos fibres, glass beads or fibres
 B01D 39/08
·  Filter cloth, i.e. woven, knitted or interlaced material (metallic B01D 39/10)
 B01D 39/10
·  Filter screens essentially made of metal
 B01D 39/12
·  ·  of wire gauze; of knitted wire; of expanded metal
 B01D 39/14
·  Other self-supporting filtering material
 B01D 39/16
·  ·  of organic material, e.g. synthetic fibres
 B01D 39/18
·  ·  ·  the material being cellulose or derivatives thereof (making filter paper D21F 11/14)
 B01D 39/20
·  ·  of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires (porous ceramic material C04B 21/00; sintering metals C22C 1/04)
 B01D 41/00
Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
 B01D 41/02
·  of loose filtering material
 B01D 41/04
·  of rigid self-supporting filtering material
 B01D 43/00
Separating particles from liquids, or liquids from solids, otherwise than by sedimentation or filtration (magnetic or electrostatic separation B03C; flotation processes B03D 1/00; drying solid materials or objects F26B)
 B01D 45/00 - 
B01D 51/00
Separating dispersed particles from gases or vapours (separating pneumatically-conveyed materials from propelling gas B65G 53/60; air cleaners for the intakes of combustion engines F02M 35/00, of compressors F04B 39/16)
 B01D 45/00
Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
 B01D 45/02
·  by utilising gravity
 B01D 45/04
·  by utilising inertia (B01D 45/12 takes precedence)
 B01D 45/06
·  ·  by reversal of direction of flow
 B01D 45/08
·  ·  by impingement against baffle separators
 B01D 45/10
·  ·  ·  which are wetted
 B01D 45/12
·  by centrifugal forces (centrifuges B04B; cyclones B04C)
 B01D 45/14
·  ·  generated by rotating vanes, discs, drums or brushes
 B01D 45/16
·  ·  generated by the winding course of the gas stream
 B01D 45/18
·  Cleaning-out devices
 B01D 46/00
Filters and filtering processes specially modified for separating dispersed particles from gases or vapours (filtering elements B01D 23/00-B01D 35/00; filtering material B01D 39/00; their regeneration outside the filters B01D 41/00)
 B01D 46/02
·  Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
 B01D 46/04
·  ·  Cleaning filters
 B01D 46/06
·  ·  with means keeping the working surfaces flat
 B01D 46/08
·  ·  ·  the working surfaces forming a star shape
 B01D 46/10
·  Particle separators, e.g. dust precipitators, using filter plates, sheets, or pads having plane surfaces
 B01D 46/12
·  ·  in multiple arrangements
 B01D 46/14
·  ·  arranged in a star shape
 B01D 46/16
·  ·  arranged on non-filtering conveyers
 B01D 46/18
·  Particle separators, e.g. dust precipitators, using filtering belts
 B01D 46/20
·  ·  the belts combined with drums
 B01D 46/22
·  ·  the belts travelling during filtering
 B01D 46/24
·  Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
 B01D 46/26
·  ·  rotatable
 B01D 46/28
·  Particle separators, e.g. dust precipitators, using filter brushes
 B01D 46/30
·  Particle separators, e.g. dust precipitators, using loose filtering material
 B01D 46/32
·  ·  the material moving during filtering
 B01D 46/34
·  ·  ·  not horizontally, e.g. using shoots
 B01D 46/36
·  ·  ·  as a substantially horizontal layer, e.g. on rotary tables, drums, conveyer belts
 B01D 46/38
·  ·  ·  as fluidised bed
 B01D 46/40
·  Particle separators, e.g. dust precipitators, using edge filters, i.e. using contiguous impervious surfaces
 B01D 46/42
·  Auxiliary equipment and operation thereof
 B01D 46/44
·  ·  controlling filtration
 B01D 46/46
·  ·  ·  automatic
 B01D 46/48
·  ·  Removing dust other than cleaning filters
 B01D 46/50
·  ·  Means for discharging electrostatic potential
 B01D 46/52
·  Particle separators, e.g. dust precipitators, using filters embodying folded material
 B01D 46/54
·  Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
 B01D 47/00
Separating dispersed particles from gases or air or vapours by liquid as separating agent (B01D 45/10 takes precedence; fractionating columns or parts thereof B01D 3/16)
 B01D 47/02
·  by passing the gas or air or vapour over or through a liquid bath
 B01D 47/04
·  by passing the gas or air or vapour through foam
 B01D 47/05
·  by condensation of the separating agent  [3]
 B01D 47/06
·  Spray cleaning
 B01D 47/08
·  ·  with rotary nozzles
 B01D 47/10
·  Venturi scrubbers
 B01D 47/12
·  Washers with plural different washing sections (B01D 47/14 takes precedence)
 B01D 47/14
·  Packed scrubbers
 B01D 47/16
·  Apparatus having rotary means, other than rotatable nozzles, for atomising the cleaning liquid
 B01D 47/18
·  ·  with horizontally-arranged shafts
 B01D 49/00
Separating dispersed particles from gases or air or vapours by other methods (magnetic or electrostatic separation B03C)
 B01D 49/02
·  by thermal repulsion
 B01D 50/00
Combinations of devices for separating particles from gases or vapours
 B01D 51/00
Auxiliary pre-treatment of gases or vapours to be cleaned (preventing dust fires A62C)
 B01D 51/02
·  Amassing the particles, e.g. by flocculation
 B01D 51/04
·  ·  by seeding, e.g. by adding particles
 B01D 51/06
·  ·  by varying the pressure of the gas or vapour
 B01D 51/08
·  ·  ·  by sound or ultrasonics
 B01D 51/10
·  Conditioning the gas to be cleaned
 B01D 53/00
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical purification of smoke, fumes, or exhaust gases (recovery of volatile solvents by condensation B01D 5/00; sublimation B01D 7/00; cold traps, cold baffles B01D 8/00; adsorption or absorption in general B01J; cleaning coal gas C10K; separation of difficultly-condensable gases or air by liquefaction F25J)
 B01D 53/02 - 
B01D 53/32

Note(s)

Group B01D 53/34 takes precedence over groups B01D 53/02-B01D 53/32.

 B01D 53/02
·  by adsorption
 B01D 53/04
·  ·  with stationary adsorbents
 B01D 53/06
·  ·  with moving adsorbents
 B01D 53/08
·  ·  ·  according to the "moving bed" method
 B01D 53/10
·  ·  ·  with dispersed adsorbents
 B01D 53/12
·  ·  ·  ·  according to the "fluidised technique"
 B01D 53/14
·  by absorption
 B01D 53/16
( transferred to B01J, covered by B01D 53/14 )
 B01D 53/18
·  ·  Absorbing units; Liquid distributors therefor (B01D 3/16, B01D 3/26, B01D 3/30 take precedence)
 B01D 53/20
·  ·  ·  Loose filling elements for absorbing units
 B01D 53/22
·  by diffusion
 B01D 53/24
·  by centrifugal force (centrifuges B04B; cyclones B04C)
 B01D 53/26
·  Drying gases or vapours
 B01D 53/28
·  ·  Selection of materials for use as drying agents
 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 B01D 13/02 (electrostatic separation B03C)
 B01D 53/34
·  Chemical purification of waste gases, e.g. smoke, fumes, flue gases, engine exhaust gases (non-chemical aspects of purifying or otherwise treating engine exhaust gases F01N 3/00)
 B01D 53/36
·  ·  by catalytic conversion  [3]
 B01D 57/00
Separation, other than separation of solids, not fully covered by a single other group or sub-class, e.g. B03C
 B01D 57/02
·  by electrophoresis (electrophoretic production of compounds or non-metals C25B 7/00; investigating or analysing materials by using eletrophoresis G01N 27/26)  [3]
 B01D 59/00
Separation of different isotopes of the same chemical element (preventing occurrence of critical conditions when producing fissile material G21; shielding from radioactivity G21F)
 B01D 59/02
·  Separation by phase transition
 B01D 59/04
·  ·  by distillation
 B01D 59/06
·  ·  by fractional melting; by zone melting
 B01D 59/08
·  ·  by fractional crystallisation, by precipitation, by zone freezing
 B01D 59/10
·  Separation by diffusion
 B01D 59/12
·  ·  by diffusion through barriers
 B01D 59/14
·  ·  ·  Construction of the barrier
 B01D 59/16
·  ·  by thermal diffusion
 B01D 59/18
·  ·  by separation jets
 B01D 59/20
·  Separation by centrifuging
 B01D 59/22
·  Separation by extracting
 B01D 59/24
·  ·  by solvent extraction
 B01D 59/26
·  ·  by sorption, i.e. absorption, adsorption, persorption
 B01D 59/28
·  Separation by chemical exchange
 B01D 59/30
·  ·  by ion exchange
 B01D 59/32
·  ·  by exchange between fluids
 B01D 59/33
·  ·  ·  involving dual temperature exchange  [2]
 B01D 59/34
·  Separation by photochemical methods
 B01D 59/36
·  Separation by biological methods
 B01D 59/38
·  Separation by electrochemical methods (in general B01J)
 B01D 59/40
·  ·  by electrolysis
 B01D 59/42
·  ·  by electromigration; by electrophoresis
 B01D 59/44
·  Separation by mass spectrography (particle spectrometer or separator tubes H01J 49/00)
 B01D 59/46
·  ·  using only electrostatic fields
 B01D 59/48
·  ·  using electrostatic and magnetic fields
 B01D 59/50
·  Separation involving two or more processes covered by different groups selected from groups B01D 59/02, B01D 59/10, B01D 59/20, B01D 59/22, B01D 59/28, B01D 59/34, B01D 59/36, B01D 59/38, B01D 59/44