# US 5,700,439 A · Method of removing hydrogen sulfide from hot gas mixtures

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,700,439 A
- Document ID: US5700439A
- Status: Granted
- Kind: A
- Application number: 08/659,966
- Filed: 1996-06-07
- Granted: 1997-12-23
- Earliest claimed: 1996-06-07
- Assignees: Chemetals Technology Incorporated
- Inventors: William J. Goyette; Francis J. Keenan
- Web page: https://patentgrep.com/patent/US5700439A

## CPC

- B01J 20/06: comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01D 2257/30: Sulfur compounds
- Y10S 502/50: Stabilized
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Coated sulfur sorbent particles have been found to resist agglomeration when used in industrial processes generating sulfur vapors at elevated temperatures, even in the presence of hydrogen chloride and/or water vapor. These coated sulfur sorbents have been found to improve vapor phase sulfur sorption processes at elevated temperatures in either single or multiple sulfidation cycles followed by regeneration.

## Claims

### Claim 1

In a hydrocarbon refining process wherein vapor phase sulfide compounds are scavenged by a solid sorbent selected from the group consisting of oxides, aluminates, titanates, and ferrites of manganese, zinc, nickel, iron and mixtures thereof, the improvement comprising retarding sorbent agglomeration by externally coating said solid sorbent with a coating which does not interfere with the sorbent's ability to sorb, said coating from 5 to 20 microns of a substance inert to both sorbent and vapor phase sulfide compounds selected from the group consisting of alumina, silica, bentonite, and cerium oxide.

### Claim 2 (depends on 1)

The process as set forth in claim 1, wherein said sulfide sorbent is selected from the group consisting of manganese oxide, zinc oxide, nickel oxide, and iron oxide.

### Claim 3 (depends on 1)

The process as set forth in claim 1, wherein said sulfide sorbent is MnO.

### Claim 4 (depends on 1)

The process as set forth in claim 1, wherein said coating material is alumina.

### Claim 5 (depends on 1)

The process as set forth in claim 1, wherein said coating material is silica.

### Claim 6 (depends on 1)

The process as set forth in claim 1, wherein said coating material is cerium oxide.

### Claim 7 (depends on 1)

The process as set forth in claim 1, including regenerating said coated vapor phase sulfur sorbent and removing additional sulfur vapors.

### Claim 8 (depends on 1)

The process as set forth in claim 1, wherein said vapor phase sulfide compound is hydrogen sulfide.

### Claim 9 (depends on 1)

The process as set forth in claim 1, wherein said coating material is bentonite.

### Claim 10 (depends on 9)

The process as set forth in claim 9, wherein said sulfide sorbent is MnO.

### Claim 11

In an industrial process wherein vapor phase sulfide compounds are scavenged by a solid sorbent selected from the group consisting of oxides, aluminates, titanates, and ferrites of manganese, zinc, nickel, iron and mixtures thereof, the improvement comprising retarding sorbent agglomeration by externally coating said solid sorbent with a coating which does not interfere with the sorbent's ability to sorb, said coating from 5 to 20 microns of a substance inert to both sorbent and vapor phase sulfide compounds selected from the group consisting of alumina, silica and bentonite.

### Claim 12 (depends on 11)

The process as set forth in claim 11, wherein said sulfide sorbent is selected from the group consisting of manganese oxide, zinc oxide, nickel oxide, and iron oxide.

### Claim 13 (depends on 11)

The process as set forth in claim 11, wherein said coating material is alumina.

### Claim 14 (depends on 11)

The process as set forth in claim 11, wherein said coating material is silica.

### Claim 15 (depends on 11)

The process as set forth in claim 11, wherein said coating material is bentonite.