Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients; and associated systems and methods

Patent metadata

Field	Value
Publication number	US-2024150235-A1
Application number	US-202318395402-A
Country	US
Kind code	A1
Filing date	Dec 22, 2023
Priority date	Jan 16, 2019
Publication date	May 9, 2024
Grant date	—

Abstract

Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients (e.g., spatially varying pH gradients), and associated systems and methods, are generally described.

First claim

What is claimed is:

1 . A method comprising:
producing an acid; dissolving a material comprising calcium with the acid to produce calcium ions; treating the calcium ions to produce solid calcium hydroxide and/or calcium oxide; and heating the solid calcium hydroxide and/or calcium oxide in a kiln to produce a cement.

2 . The method of claim 1 , wherein producing the solid calcium hydroxide and/or calcium oxide comprises producing a byproduct different from the calcium hydroxide and/or calcium oxide.

3 . The method of claim 2 , further comprising collecting the byproduct.

4 . The method of claim 1 , further comprising heating the solid calcium hydroxide and/or calcium oxide with silica and/or alumina in the kiln to produce the cement.

5 . The method of claim 1 , further comprising heating the solid calcium hydroxide and/or calcium oxide with silicate in the kiln to produce the cement.

6 . The method of claim 1 , wherein the cement is Portland cement.

7 . The method of claim 1 , wherein dissolving the material with the acid occurs in a region of a reactor with a pH of 6 or less.

8 . The method of claim 1 , wherein the material further comprises magnesium and/or nickel.

9 . The method of claim 8 , wherein the material comprises calcium carbonate, magnesium carbonate, and/or nickel carbonate.

10 . The method of claim 1 , further comprising heating the calcium hydroxide in a heater to convert the calcium hydroxide to calcium oxide.

11 . The method of claim 1 , further comprising mixing the cement with water and an additive to form a concrete.

12 . A method comprising:
producing an acid; dissolving a material comprising calcium with the acid to produce calcium ions; treating the calcium ions to produce solid calcium hydroxide and/or calcium oxide; and heating the solid calcium hydroxide and/or calcium oxide with silica, alumina, and/or silicate in a kiln to produce a cement.

13 . The method of claim 12 , wherein producing the solid calcium hydroxide and/or calcium oxide comprises producing a byproduct different from the calcium hydroxide and/or calcium oxide.

14 . The method of claim 13 , further comprising collecting the byproduct.

15 . The method of claim 14 , wherein the cement is Portland cement.

16 . The method of claim 15 , wherein dissolving the material in the acid is in a region of a reactor with a pH of 6 or less.

17 . The method of claim 16 , wherein the material further comprises magnesium and/or nickel.

18 . The method of claim 17 , wherein the material comprises calcium carbonate, magnesium carbonate, and/or nickel carbonate.

19 . The method of claim 12 , further comprising heating the calcium hydroxide in a heater to convert the calcium hydroxide to calcium oxide.

20 . The method of claim 16 , further comprising mixing the cement with water and an additive to form a concrete.

Assignees

• Massachusetts Inst Technology

Inventors

• Chiang Yet-Ming
• Ellis Leah
• Badel Andres

Classifications

• Y02P40/121

  Energy efficiency measures, e.g. improving or optimising the production methods · CPC title

• C04B7/06 Primary

  using alkaline raw materials (C04B7/60 takes precedence) · CPC title

• Y02P40/18

  Carbon capture and storage [CCS] · CPC title

• C04B2/08 Primary

  Devices therefor · CPC title

• B01J19/0033

  Optimalisation processes, i.e. processes with adaptive control systems (adaptive control systems per se G05B13/00) · CPC title