# US 9,517,447 B1 · Processes for removing contaminants from a dehydrogenation effluent

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

- Number: US 9,517,447 B1
- Document ID: US9517447B1
- Status: Granted
- Kind: B1
- Application number: 14/727,246
- Filed: 2015-06-01
- Published: 2016-12-01
- Granted: 2016-12-13
- Earliest claimed: 2015-06-01
- Assignees: Uop LLC
- Applicants: Uop LLC
- Inventors: Vladislav I. Kanazirev; Jayant K. Gorawara; Joseph E. Zimmermann
- Web page: https://patentgrep.com/patent/US9517447B1

## CPC

- B01J 20/3458: {in the gas phase}
- B01D 53/04: with stationary adsorbents {(B01D53/025 takes precedence)}
- B01D 53/0462: {Temperature swing adsorption}
- B01D 53/261: {by adsorption}
- B01D 53/82: with stationary reactants
- B01J 20/3433: {of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425}
- C07C 5/333: Catalytic processes
- C07C 7/12: by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
- B01D 2253/1124: Metal oxides
- B01D 2257/2045: Hydrochloric acid
- B01D 2257/2064: Chlorine
- B01D 2257/304: Hydrogen sulfide
- B01D 2257/308: Carbonoxysulfide COS
- B01D 2257/80: Water
- B01D 2259/40056: Gases other than recycled product or process gas
- B01D 2259/40086: by using a purge gas (B01D2259/4009 takes precedence)
- B01D 2259/402: using two beds
- Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. CO2
- 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)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A process for the providing a regenerant gas stream for a regenerable adsorbent used to remove water and hydrogen sulfide from a reactor effluent in a catalytic dehydrogenation process is described. The reactor effluent is compressed in a compressor to provide a compressed effluent. The compressed effluent may be treated to remove chlorides, and then passed to a dryer zone having a regenerable adsorbent. A regenerant gas stream is used to desorb the water and hydrogen sulfide and the spent regenerant stream may be passed to a cleaning zone having a sorbent configured to remove hydrogen sulfide from the spent regenerant stream. The cleaned regenerant gas stream may be recycled to the dryer zone to desorb and/or regenerate the regenerable adsorbent.

## Claims

### Claim 1

A process for removing contaminants from a reactor effluent of a catalyst dehydrogenation process, the process comprising:
dehydrogenating a paraffin feed in a dehydrogenation reaction zone under dehydrogenation reaction conditions in the presence of a dehydrogenation catalyst to form a reactor effluent containing olefins;
compressing the reactor effluent to provide a compressed effluent;
removing chloride contaminants from the compressed effluent in a chloride removal zone to provide a treated effluent;
removing water and hydrogen sulfide from the treated effluent in a dryer zone to provide a dryer output stream including olefins and unconverted paraffins, the dryer zone having at least one vessel comprising a regenerable adsorbent;
separating the dryer output stream into a vapor stream and a liquid stream comprising an olefin product stream;
regenerating the regenerable adsorbent in the dryer zone with a regenerant gas stream to produce a spent regenerant stream, the spent regenerant stream including water and hydrogen sulfide; wherein the regenerant gas stream comprises a portion of the reactor effluent;
removing the hydrogen sulfide from the spent regenerant stream in a regenerant cleaning zone to provide a cleaned regenerant stream, the regenerant cleaning zone including at least two vessels having a sorbent to remove hydrogen sulfide from the spent regenerant stream; wherein two vessels are operated in a lead-lag configuration; wherein at least one vessel is used as a heat exchanger to remove heat from the cleaned regenerant stream to provide a cooled regenerant stream;
removing contaminants form the cooled regenerant stream; and
recycling the cooled regenerant stream to provide to the dryer as the regenerant gas stream.

### Claim 2 (depends on 1)

The process of claim 1 wherein the dehydrogenation reaction zone comprises a plurality of reactors, and wherein the regenerant gas stream comprises an effluent stream.

### Claim 3 (depends on 2)

The process of claim 2 further comprising:
compressing the cleaned regenerant gas stream to provide a compressed regenerant gas; and
passing the compressed regenerant gas to a water removal vessel to remove water, heavy hydrocarbons, or both from the compressed regenerant gas.

### Claim 4 (depends on 3)

The process of claim 3 further comprising:
passing the compressed regenerant gas to the product separator.

### Claim 5 (depends on 3)

The process of claim 3 further comprising:
combining the compressed regenerant gas with the compressed effluent.

### Claim 6 (depends on 3)

The process of claim 3 further comprising:
combining the compressed regenerant gas with the treated effluent.

### Claim 7 (depends on 1)

The process of claim 1 wherein the sorbent in the regenerant cleaning zone comprises a solid adsorbent which includes metal oxide on a support.