Process for obtaining synthetic geopolymers and synthetic geopolymers

Patent metadata

Field	Value
Publication number	US-12371377-B2
Application number	US-202217943612-A
Country	US
Kind code	B2
Filing date	Sep 13, 2022
Priority date	Sep 15, 2021
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present invention relates to a geopolymer produced from a synthetic aluminosilicate. The synthetic aluminosilicate was produced by sol gel technology, heat treated and, later, activated using sodium silicate and sodium hydroxide in solution, having as a final product a synthetic geopolymer. The final product was submitted to CO2 adsorption analysis using thermogravimetry for adsorbed quantification. In addition to the pure geopolymer, it is also possible to produce the synthetic geopolymer with the addition of surfactant, or in the composite form with the addition of zeolite, or heat treated to form a zeolite or functionalized with amine, for example, to increase the adsorption capacity.

First claim

The invention claimed is:

1. A process to produce synthetic geopolymers, the process comprising:
preparing a solution containing water, sodium silicate, and sodium hydroxide and leaving the solution to rest at room temperature for at least 10 minutes;
calcining a synthetic powder at a temperature between 300° C. and 900° C., followed by basic or acid activation, wherein the synthetic powder is a synthetic aluminosilicate;
mixing the solution with the synthetic powder to obtain a geopolymer paste; and
after mixing, waiting for a final cure, from 10 minutes, until a desired final mechanical resistance to compression of the geopolymer paste is achieved.

2. A process according to claim 1 , wherein the aluminosilicate is obtained by sol gel technology.

3. A process according to claim 1 , wherein the sodium silicate has from 5% to 20% of Na 2 O and 5% to 50% of SiO 2 .

4. A process according to claim 1 , further comprising functionalizing a geopolymer sample of the geopolymer paste through an impregnation of an amine after curing.

5. A process according to claim 4 , wherein the impregnation comprises preparing a solution between 1% and 50% of an amine in a solvent, leaving the solution stirring for 1 minute to 1 hour, adding the geopolymer sample while maintaining stirring from 3 to 24 hours and drying in an oven for 10 minutes to 12 hours at a temperature of 40° C. to 80° C.

6. A process according to claim 5 , wherein the amine is diethyl triamine and the solvent is ethanol.

7. A process according to claim 1 , further comprising incorporating a surfactant while mixing the solution.

8. A process according to claim 1 , further comprising heat treating at a temperature above 200° C., after curing, to form zeolite.

9. A process according to claim 1 , further comprising adding a zeolite while mixing the solution to form a composite.

10. A process according to claim 1 , further comprising washing the geopolymer paste to remove excess unreacted sodium.

11. The process of claim 7 , wherein the surfactant comprises cetyl trimethylammonium bromide (CTAB).

12. The process of claim 9 , wherein the zeolite comprises zeolite Y.

13. The process of claim 1 , wherein basic activation is used, wherein an alkaline activator used for base activation is sodium hydroxide or potassium hydroxide.

14. The process of claim 1 , wherein acid activation is used, wherein an acid activator used for the acidic activation is phosphoric acid.

15. A synthetic geopolymer as obtained in claim 1 , wherein the geopolymer has a mechanical resistance to compression from 0 to 40 MPa, surface area from 1 m 2 /g to 800 m 2 /g, pore structure that can present micro, meso, and macropores and CO 2 adsorption capacity from 0 to 100 milligrams of CO 2 per gram of geopolymer.

Assignees

• Petroleo Brasileiro S A —Petrobras
• Univ Federal De Minas Gerais—Ufmg

Inventors

• Vasconcelos Wander Luiz
• Ferreira Do Nascimento Jailton
• De Oliveira Notório Ribeiro Jéssica
• Cordeiro Leite Vasconcelos Daniela
• Arruda Pereira Mariana

Classifications

• C04B22/062

  of the alkali or alkaline-earth metals · CPC title

• C04B2103/0093

  Organic cosolvents · CPC title

• C04B2103/10

  Accelerators; Activators · CPC title

• C04B22/165

  Acids · CPC title

• C04B2103/404

  cationic · CPC title