# US 9,039,808 B2 · Systems and methods for gas treatment

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- Number: US 9,039,808 B2
- Document ID: US9039808B2
- Status: Granted
- Kind: B2
- Application number: 13/393,692
- Filed: 2010-08-31
- Published: 2012-09-06
- Granted: 2015-05-26
- Earliest claimed: 2009-09-01
- Assignees: Blue-Zone Technologies Ltd.
- Applicants: Dusanka Filipovic; Laurence Whitby; Biljna Milin; Frederick Cashin
- Inventors: Dusanka Filipovic; Laurence Whitby; Biljna Milin; Frederick Cashin
- Web page: https://patentgrep.com/patent/US9039808B2

## CPC

- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- A61M 16/009: {Removing used or expired gases or anaesthetic vapours (filtering, sterilising or disinfecting the exhaust air in drainage systems A61M1/784; bacterial filters in the expiratory path A61M16/1065)}
- A61M 16/0093: {by adsorption, absorption or filtration}
- A61P 23/00: Anaesthetics
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 53/70: Organic halogen compounds
- B01J 20/103: {comprising silica}
- B01J 20/12: Naturally occurring clays or bleaching earth
- B01J 20/16: Alumino-silicates (B01J20/12 takes precedence)
- B01J 20/18: Synthetic zeolitic molecular sieves
- B01J 20/28057: {Surface area, e.g. B.E.T specific surface area}
- B01J 20/28061: {being in the range 100-500 m2/g}
- B01J 20/28064: {being in the range 500-1000 m2/g}
- B01J 20/28071: {being less than 0.5 ml/g}
- B01J 20/28078: {Pore diameter}
- B01J 20/2808: {being less than 2 nm, i.e. micropores or nanopores}
- B01J 20/28083: {being in the range 2-50 nm, i.e. mesopores}
- B01J 20/3408: {of aluminosilicate molecular sieves}
- B01J 20/3483: {by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling}
- C07C 41/34: Separation; Purification; Stabilisation; Use of additives
- F16K 11/00: Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- G01N 25/18: by investigating thermal conductivity (by calorimetry G01N25/20; by measuring change of resistance of an electrically-heated body G01N27/18)
- G01N 27/14: of an electrically-heated body in dependence upon change of temperature
- A61M 16/1055: {bacterial}
- A61M 16/1065: {in the expiratory path}
- A61M 2205/84: for treating several patients simultaneously
- B01D 2253/1085: characterized by a silicon-aluminium ratio
- B01D 2253/306: Surface area, e.g. BET-specific surface
- B01D 2253/308: Pore size
- B01D 2257/2062: Bromine compounds
- B01D 2257/2064: Chlorine
- B01D 2257/2066: Fluorine
- B01D 2257/504: Carbon dioxide
- B01D 2258/02: Other waste gases
- B01D 2259/4009: using hot gas
- B01D 2259/40094: by applying microwaves
- B01D 2259/4533: for medical purposes
- B01J 2220/603: serially disposed columns
- B01J 2220/606: parallel disposed columns
- Y02C 20/40: of CO2
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- 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)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A system and process for the recovery of at least one halogenated hydrocarbon from a gas stream. The recovery includes adsorption by exposing the gas stream to an adsorbent with a lattice structure having pore diameters with an average pore opening of between about 5 and about 50 angstroms. The adsorbent is then regenerated by exposing the adsorbent to a purge gas under conditions which efficiently desorb the at least one adsorbed halogenated hydrocarbon from the adsorbent. The at least one halogenated hydrocarbon (and impurities or reaction products) can be condensed from the purge gas and subjected to fractional distillation to provide a recovered halogenated hydrocarbon.

## Claims

### Claim 1

An adsorbent for adsorbing a halogenated hydrocarbon, the adsorbent comprising:
a first silica having an organophillic pore lattice structure with an average pore opening of between 5 and 10 angstroms, and
a second silica having an organophillic pore lattice structure with an average pore opening of between 15 and 30 angstroms, the first silica being separated from the second silica.

### Claim 2 (depends on 1)

The adsorbent according to claim 1, wherein the adsorbent has less than 10% by weight of Al2O3.

### Claim 3 (depends on 1)

The adsorbent of claim 1, wherein the adsorbent is configured to adsorb the halogenated hydrocarbon from a gas stream comprised of air mixed with the halogenated hydrocarbon and the adsorbent is configured such that the gas stream flows through the first silica and then the second silica.

### Claim 4 (depends on 1)

The adsorbent of claim 1, wherein at least one of the first silica and second silica comprise a silica gel.

### Claim 5 (depends on 4)

The adsorbent of claim 4, wherein the silica gel has an average surface area of about 400 to 750m2/g.

### Claim 6 (depends on 1)

The adsorbent of claim 1, wherein the first silica has an average pore size of about 6 angstroms and the second silica has an average pore size of about 20 angstroms.

### Claim 7 (depends on 1)

The adsorbent of claim 1, wherein the halogenated hydrocarbon comprises a plurality of halogenated hydrocarbons.

### Claim 8 (depends on 7)

The adsorbent of claim 7, wherein the plurality of halogenated hydrocarbons comprise desflurane and sevoflurane.

### Claim 9 (depends on 1)

The adsorbent of claim 1, wherein the second silica comprises amorphous silica.