US 12,017,199 B2 · Process for preparing sulfated adsorbents, sulfated adsorbents and use

Abstract

The present invention is in relation to a process for preparing calcium phosphate-based sulfated adsorbents that capture mercury in gas streams, comprised of the steps of synthesis of the precursors, incorporation of a transition metal, and sulfation of the material. These adsorbents present high efficiency both for removal of low concentrations of mercury, such as in natural gas, and for stabilization of this pollutant. The adsorbents obtained in the invention may be used in the Mercury Removal Units (MRUs) present in natural gas processing plants, which mercury removal units may be located either upstream or downstream of the dehydration and H2S removal units, due to the adsorbents obtained showing resistance to H2S poisoning, and maintaining their performance in the presence of water.

Claims11

Dependent claims

A process for preparing sulfated adsorbents, comprising:

a. synthesizing precursors;
b. incorporating 3 to 25% of transition metals in the synthesized precursors via dry impregnation, calcination at 350° C. occurring in two steps;
c. Pre-treating the product of step b at 200° C. with a heating rate of 10° C./min for 2 hours under a flow of inert gas;
and
d. sulfating the resulting adsorbent by passage of the mixture of 5% w/w H2S/inert gas at ambient temperature;
wherein the precursors are hydroxyapatite (HAp), titanium dioxide, or a physical mixture thereof;
wherein the hydroxyapatite (HAp) is synthesized by direct precipitation;
and
wherein the titanium dioxide is synthesized by slow hydrolysis of titanium isopropoxide in an inert atmosphere.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/506,296Filed 20 Oct 2021

Priority

BR BR102020021821223 Oct 2020

Published

US 2022/0126266 A128 Apr 2022

Granted

25 Jun 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

B01J 20/048
Comprising compounds of alkali metals, alkaline earth metals or magnesium: containing phosphorus, e.g. phosphates, apatites, hydroxyapatites
B01D 53/02
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g.…: by…
B01J 20/3085
Processes for preparing, regenerating, or reactivating: chemical treatments not covered by groups B01J20/3007 - B01J20/3078
B01J 20/3204
Characterised by the carrier, support or substrate used for impregnation or coating: inorganic carriers, supports or substrates

Process for preparing sulfated adsorbents, sulfated adsorbents and use

Life of this patent

Process for preparing sulfated adsorbents, sulfated adsorbents and use

Life of this patent

Abstract

Claims11