US 5,401,481 AGranted

Processes for removing acid components from gas streams

AssigneeBoard of Regents, The University of Texas System

InventorsGary T. Rochelle, Claus Jorgensen, John C. S. Chang, Theodore G. Brna, Charles B. Sedman, Wojciech Jozewicz

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Abstract

The present disclosure relates to improved processes for treating acid gases to remove acid gas components therefrom. Processes in accordance with the present invention include preparing a calcium silicate hydrate sorbent in the form of a semi-dry, free-flowing powder, and treating the gas with the powdery sorbent, such as by injecting the sorbent into a stream of the gas. The powdery sorbents may be prepared by slurrying/drying or pressure hydration techniques. Examples disclosed herein demonstrate the utility of these processes in achieving improved acid gas-absorbing capabilities in both lab-scale and pilot plant studies. Additionally, disclosure is provided which illustrates preferred plant design configurations for employing the present processes using conventional dry sorbent injection equipment. Retrofit application to existing plants is also addressed.

Claims5

Dependent claims

A process for preparing a semi-dry, free-flowing powdery substance for use in reducing the level of acid components in a gas stream, the substance being prepared by a process that comprises:

(a) preparing a mixture comprising a material containing calcium together with a material containing calcium-reactive silica, the calcium and silica being present in amounts sufficient to allow for formation of calcium silicate, the mixture being prepared by a method which comprises:
(i) mixing the material containing calcium together with the material containing calcium-reactive silica;
(ii) heating the mixture to a temperature above ambient to facilitate in the formation of the calcium silicate;
and
(iii) pressuring the mixture with water in the form of steam in a manner sufficient to allow for hydration of the calcium silicate;
and
(b) providing the mixture at a water content of between about 5% and about 50% by weight to provide the semi-dry, free-flowing powdery substance by using a method which comprises:
(i) hydrating the mixture with a sufficient amount of water to produce an aqueous slurry;
and
(ii) drying the slurry by mixing it with spent solids.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/032,472Filed 15 Mar 1993 · continuation
Priority: 10 Nov 1986
Granted: 28 Mar 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B01D 53/508
Sulfur oxides: by treating the gases with solids
B01D 53/68
Removing components of defined structure: halogens or halogen compounds
C01B 33/24
Silicates: alkaline-earth metal silicates
B01D
Separation

Family

Serial930,171Parent of this continuation-in-part · filed 10 Nov 1986
Serial163,090Parent of this division · filed 2 Mar 1988
Serial771,051Parent of this continuation · filed 2 Oct 1991
US 5,100,643 AParent of this division
US 5,401,481 AThis patent

From the US filing history. Foreign family members aren’t listed.