# US 10,500,541 B2 · Chemical absorbent

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- Number: US 10,500,541 B2
- Document ID: US10500541B2
- Status: Granted
- Kind: B2
- Application number: 15/520,758
- Filed: 2015-10-26
- Published: 2017-11-09
- Granted: 2019-12-10
- Earliest claimed: 2014-10-28
- Assignees: Intersurgical AG
- Applicants: Intersurgical AG
- Inventors: Michael John Holder
- Web page: https://patentgrep.com/patent/US10500541B2

## CPC

- B01D 53/62: Carbon oxides
- A61M 16/0891: {Closed circuit, e.g. for anaesthesia}
- A61M 16/22: Carbon dioxide-absorbing devices {; Other means for removing carbon dioxide}(cartridges with absorbing substances for respiratory apparatus A62B19/00)
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01J 20/041: {Oxides or hydroxides}
- B01J 20/186: {Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity}
- B01J 20/28007: {with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like (carbon nanostructures B01J20/205)}
- B01J 20/3007: {Moulding, shaping or extruding}
- B01D 2251/404: of calcium
- B01D 2251/604: Hydroxides
- B01D 2253/108: Zeolites
- B01D 2253/1122: Metals
- B01D 2253/25: Coated, impregnated or composite adsorbents
- B01D 2257/504: Carbon dioxide
- B01D 2259/4533: for medical purposes
- B01J 2220/49: Materials comprising an indicator, e.g. colour indicator, pH-indicator
- Y02C 20/40: of CO2
- 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)
- 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)}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A chemical absorbent comprising a hydrated mixture of a major proportion of a pharmaceutically acceptable hydroxide of a Group II metal and a minor proportion of a Group I metal-containing zeolite. The chemical absorbent is substantially free of hydroxides of Group I metals.

## Claims

### Claim 1

A chemical absorbent consisting of:
a hydrated mixture of a major proportion of a pharmaceutically acceptable hydroxide of a Group II metal and a minor proportion of a Group I metal-containing zeolite, and one or more pH-sensitive dyes and/or other pigments;
wherein
the pharmaceutically acceptable hydroxide of a Group II metal is present in an amount of between 92% and 97% w/w of the chemical absorbent (on a dry basis);
the Group I metal-containing zeolite is present in an amount of between 3% and 8% w/w of the chemical absorbent (on a dry basis);
the dyes and/or pigments are present in an amount of less than 0.5% w/w of the chemical absorbent (on a dry basis);
the chemical absorbent contains less than 0.5% w/w (on a dry basis) of hydroxides of Group I metals; and
the chemical absorbent has a water content of between 12% and 21% w/w.

### Claim 2

A chemical absorbent comprising a hydrated mixture of a major proportion of a pharmaceutically acceptable hydroxide of a Group II metal and a minor proportion of a Group I metal-containing zeolite, the chemical absorbent comprising less than 0.5% w/w of hydroxides of Group I metals, other components being present only in amounts of less than 1% w/w (on a dry basis).

### Claim 3 (depends on 2)

A chemical absorbent as claimed in claim 2, wherein the pharmaceutically acceptable hydroxide is calcium hydroxide.

### Claim 4 (depends on 2)

A chemical absorbent as claimed in claim 2, wherein the pharmaceutically acceptable hydroxide accounts for 80-99% w/w (on a dry basis) of the chemical absorbent.

### Claim 5 (depends on 2)

A chemical absorbent as claimed in claim 2, wherein the Group I metal containing zeolite accounts for 1-20% w/w (on a dry basis) of the chemical absorbent.

### Claim 6 (depends on 2)

A chemical absorbent as claimed in claim 2, wherein the Group I metal-containing zeolite accounts for between 3% and 6% w/w of the chemical absorbent.

### Claim 7 (depends on 2)

A chemical absorbent as claimed in claim 2, which contains between 14% and 20% w/w of water.

### Claim 8 (depends on 2)

A chemical absorbent as claimed in claim 2, which consists essentially of the hydroxide of a Group II metal, Group I metal-containing zeolite and water, other components being present only in amounts of less than 1% w/w (on a dry basis).

### Claim 9 (depends on 2)

A chemical absorbent as claimed in claim 2, which consists solely of the hydroxide of a Group II metal, Group I metal-containing zeolite, water, and one or more pH-sensitive dyes and/or other pigments, the dyes and/or pigments accounting for less than 1% w/w of the composition (on a dry basis).

### Claim 10 (depends on 2)

A chemical absorbent as claimed in claim 2, wherein the Group I metal-containing zeolite is a sodium-containing zeolite.

### Claim 11 (depends on 2)

A chemical absorbent as claimed in claim 2, which further comprises a pH-sensitive dye.

### Claim 12 (depends on 11)

A chemical absorbent as claimed in claim 11, wherein the pH-sensitive dye is present at a level of 0.001% to 0.1% by weight (on a dry basis).

### Claim 13 (depends on 2)

A chemical absorbent as claimed in claim 2, which further comprises a pigment.

### Claim 14 (depends on 2)

A chemical absorbent as claimed in claim 2, which is in the form of granules.

### Claim 15 (depends on 14)

A chemical absorbent as claimed in claim 14, wherein the granules are cylindrical, spherical or substantially spherical.

### Claim 16 (depends on 2)

A method of removing carbon dioxide from a mixture of gases, the method comprising contacting the mixture of gases with a chemical absorbent as claimed in claim 2.