# US 9,040,008 B2 · Method for removal of particles and VOC from an airstream

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- Number: US 9,040,008 B2
- Document ID: US9040008B2
- Status: Granted
- Kind: B2
- Application number: 14/543,087
- Filed: 2014-11-17
- Published: 2015-03-12
- Granted: 2015-05-26
- Earliest claimed: 2010-01-13
- Assignees: EFB Inc.
- Applicants: Efb, Inc.
- Inventors: Karim Zahedi
- Web page: https://patentgrep.com/patent/US9040008B2

## CPC

- A61L 9/015: using gaseous or vaporous substances, e.g. ozone (A61L9/20 takes precedence {; evaporation in general B01B1/005})
- B01D 53/323: {by electrostatic effects or by high-voltage electric fields}
- B01D 53/864: {Removing carbon monoxide or hydrocarbons}
- B03C 3/019: Post-treatment of gases
- B03C 3/09: characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream
- C01B 13/0233: {Chemical processing only}
- C01B 13/0248: {Physical processing only}
- C01B 13/0288: {Combined chemical and physical processing}
- C01B 13/11: by electric discharge
- F24F 8/192: by electrical means, e.g. by applying electrostatic fields or high voltages
- B01D 2255/2073: Manganese
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2258/06: Polluted air
- B01D 2259/4508: for cleaning air in buildings
- B03C 2201/06: Ionising electrode being a needle
- B03C 2201/10: Ionising electrode with two or more serrated ends or sides
- C01B 2210/0003: Chemical processing
- C01B 2210/0009: Physical processing
- C01B 2210/0068: Organic compounds
- F24F 8/194: {by filtering using high voltage}
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y10S 588/90: Apparatus
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- 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 of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Apparatus and method for removal of particles and VOC from an airstream, in which particles carried by the airstream are charged by a corona ionizer and then collected by an electrically enhanced filter downstream of the ionizer. A catalytic filter downstream of the electrically enhanced filter removes VOC as well as ozone generated by the ionizer.

## Claims

### Claim 1

A method of removing contaminant particles and VOC from an airstream, which comprises:
generating ions to charge the particles and generate ozone,
collecting the charged particles downstream of the generating, and
catalytically removing VOC and ozone from the airstream downstream of the collecting of the particles.

### Claim 2 (depends on 1)

A method according to claim 1, wherein the ion generating produces an intense region of ionization upstream of an ionizer while minimizing ionization downstream of the ionizer, at a region in which an electric field directs charged particles to a particle collector.

### Claim 3 (depends on 2)

A method according to claim 2, wherein the particle collector uses an electrically enhanced filter.