Synthesis of CO2-one adsorbent for CO2 removal

Patent metadata

Field	Value
Publication number	US-9480969-B2
Application number	US-201414167460-A
Country	US
Kind code	B2
Filing date	Jan 29, 2014
Priority date	Jan 29, 2014
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A new adsorbent CO 2 -ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced Ca—Na—SiO2-Al2O3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca 2 Al(Al 1.22 Si 0.78 O 6.78 )OH 0.22 and Stilbite Na 5.76 Ca 4.96 (Al 15.68 Si 56.32 O 144 ) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca 2 Al(Al 1.22 Si 0.78 O 6.78 )OH 0.22 , Stilbite Na 5.76 Ca 4.96 (Al 15.68 Si 56.32 O 144 ) and Lawsonite CaAl 2 Si 2 O 7 OH 2 (H 2 O) with percentage of 4.1 and 7.4 and 88, respectively.

First claim

The invention claimed is:

1. A Ca—Na—SiO 2 —Al 2 O 3 /Sodium-Calcium-Aluminosilicate composition comprising:
40-45% gehlenite and 55-60% stilbite.

2. The composition of claim 1 , further comprising one or more acidic gases adsorbed thereon.

3. The composition of claim 1 , comprising 42-44% gehlenite and 56-58% stilbite.

4. The composition of claim 1 , comprising 43% gehlenite and 57% stilbite.

5. A method for making the composition of claim 1 , comprising:
mixing limestone and kaolin with a base to form a first mixture;
crystallizing the first mixture using a hydrothermal reactor and nitrogen to form a second mixture; and
calcining the second mixture to form a composition comprising gehlenite and stilbite.

6. The method of claim 5 in which the base is NaOH and the base is mixed with limestone and kaolin in an amount of 4 g/100 mL to 36 g/100 mL.

7. The method of claim 5 , further comprising calcining the second mixture at 550° C. for 2 hours.

8. The composition of claim 1 , having an acidic gas adsorption capacity of 0.10 mol/g-0.2 mol/g after a 1 st regeneration cycle.

9. The composition of claim 1 , having an acidic gas adsorption capacity of 2.0 mol/g-2.5 mol/g after a 5 th regeneration cycle.

10. A Ca—Na—SiO 2 —Al 2 O 3 /Sodium-Calcium-Aluminosilicate composition comprising 3-6% gehlenite, 5-9% stilbite, and 86-92% lawsonite.

11. The composition of claim 10 , comprising 4-5% gehlenite, 6-8% stilbite, and 87-91% lawsonite.

12. The composition of claim 10 , comprising 4.1% gehlenite, 7.4% stilbite, and 88% lawsonite.

13. A method for making the composition of claim 10 , comprising:
mixing limestone and kaolin with a base to form a first mixture;
crystallizing the first mixture using a hydrothermal reactor and nitrogen to form a second mixture; and
calcining the second mixture to form a composition comprising gehlenite and stilbite.

14. The method of claim 13 , in which the base is NaOH and the base is mixed with limestone and kaolin in an amount of 4 g/100 mL-36 g/100 mL.

15. The method of claim 13 , further comprising calcining the second mixture at 550° C. for 2 hours.

16. The composition of claim 10 , having an acidic gas adsorption capacity of 0.10 mol/g to 0.2 mol/g after a 1 st regeneration cycle.

17. The composition of claim 10 , having an acidic gas adsorption capacity of 2.0 mol/g to 2.5 mol/g after a 5 th regeneration cycle.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Shawabkeh Reyad Awwad
• Faqir Naim Moh'D
• Bkour Qusay Yousef

Classifications

• B01J20/283

  based on silica · CPC title

• B01J20/16 Primary

  Alumino-silicates (B01J20/12 takes precedence) · CPC title

• B01J20/041

  Oxides or hydroxides · CPC title

• B01J20/165

  Natural alumino-silicates, e.g. zeolites · CPC title

• B01J20/3078 Primary

  Thermal treatment, e.g. calcining or pyrolizing · CPC title