# US 11,998,870 B1 · Method of capturing carbon dioxide using carbide slag

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- Number: US 11,998,870 B1
- Document ID: US11998870B1
- Status: Granted
- Kind: B1
- Application number: 18/097,832
- Filed: 2023-01-17
- Granted: 2024-06-04
- Earliest claimed: 2023-01-17
- Assignees: United Arab Emirates University
- Applicants: United Arab Emirates University
- Inventors: Ashraf Aly Hassan; Amr El Dieb; Hilal El Hassan; Manisha Sukhraj Kothari
- Web page: https://patentgrep.com/patent/US11998870B1

## CPC

- B01D 53/0438: {Cooling or heating systems}
- B01J 20/3078: {Thermal treatment, e.g. calcining or pyrolizing}
- B01D 2257/504: Carbon dioxide
- B01J 2220/4887: Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A method of capturing carbon dioxide from a gaseous mixture at ambient temperature or higher, comprising obtaining a slurry of waste carbide slag obtained after the manufacturing of acetylene. Heating the slurry to a temperature of approximately 105° C. for two hours and sufficient to dry the slurry until a water content of about 20% of a dry mass of the carbide slag is achieved, thereby producing activated dried carbide slag. The method including contacting the activated dried carbide slag with a gaseous mixture containing CO2, thereby permitting the activated dried carbide slag to capture CO2.

## Claims

### Claim 1

An method of manufacturing active carbide slag adsorbent for capturing carbon dioxide from a gaseous mixture at an ambient temperature, said method comprising
obtaining carbide slag;
regulating a water content of the carbide slag such that the water content of the carbide slag is approximately 10% to 40% of a dry mass of the carbide slag, and wherein, the step of regulating the water content of the carbide slag comprises heating the carbide slag at a temperature of about 105° C. and -contacting the active carbide slag adsorbent with the gaseous mixture containing carbon dioxide, thereby permitting the active carbide slag adsorbent to capture carbon dioxide.

### Claim 2 (depends on 1)

The method of claim 1 wherein, the water content of the carbide slag is regulated such that the water content of the carbide slag is approximately 20% of a dry mass of the carbide slag.

### Claim 3 (depends on 1)

The method of claim 1 wherein, the step of heating the carbide slag is carried out for about 2 hours.

### Claim 4 (depends on 1)

The method of claim 1 wherein, the gaseous mixture is any gas containing carbon dioxide in gaseous form selected from any of or combination of effluent gases, atmosphere, gaseous reaction products and carbon dioxide enriched gas stream.

### Claim 5 (depends on 1)

The method of claim 1 wherein, the CO2 capture capacity of the active carbide slag adsorbent is 4.32% to 19.75% by weight.