# US 11,306,045 B2 · Refrigeration recovery from reactor feed in a propane dehydrogenation system

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- Number: US 11,306,045 B2
- Document ID: US11306045B2
- Status: Granted
- Kind: B2
- Application number: 17/016,530
- Filed: 2020-09-10
- Published: 2021-03-11
- Granted: 2022-04-19
- Earliest claimed: 2019-09-10
- Assignees: Kellogg Brown & Root LLC
- Applicants: Rian Reyneke
- Inventors: Rian Reyneke
- Web page: https://patentgrep.com/patent/US11306045B2

## CPC

- C07C 7/005: {Processes comprising at least two steps in series}
- B01D 3/007: {Energy recuperation; Heat pumps}
- B01D 3/143: {by two or more of a fractionation, separation or rectification step}
- B01D 5/006: {with evaporation or distillation}
- C07C 7/04: by distillation
- C07C 7/09: by fractional condensation
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- 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)

## Abstract

A method to recover refrigeration credit from propane feed to a propane dehydrogenation reactor by fully condensing a Depropanizer overhead stream, letting the condensed stream down in pressure, and vaporizing the stream at lower pressure against process streams to recover refrigeration credit.

## Claims

### Claim 1

A process to provide refrigeration to a propane dehydrogenation process, the process comprising:
partially or fully condensing a purified propane-rich depropanizer overhead stream against a relatively warm cooling medium at relatively high pressure;
letting down the liquid purified-rich overhead stream in pressure; and
partially or fully vaporizing the liquid purified-rich overhead stream against at least one process stream to provide refrigeration, where vaporization pressure is based on back-pressure from a propane dehydrogenation reactor, and where at least a portion of the partially or fully vaporized stream is used as feed to the propane dehydrogenation reactor.

### Claim 2 (depends on 1)

The process of claim 1 where the letting down the liquid overhead stream in pressure is based on the back-pressure from the propane dehydrogenation reactor.

### Claim 3 (depends on 1)

The process of claim 1 where in vaporizing the liquid overhead stream against at least one process stream to provide refrigeration, the refrigeration is in the range of about −10 to about 30° C.

### Claim 4 (depends on 1)

The process of claim 1 where in vaporizing the liquid overhead stream against at least one process stream to provide refrigeration offsets the requirement for refrigeration provided by a propylene or propane refrigeration system in the same temperature range.

### Claim 5 (depends on 1)

The process of claim 1 where the relatively warm cooling medium is at a temperature between about 20° C. and about 50° C. and where the relatively high pressure is between about 10 and about 20 barg.

### Claim 6

A process to provide refrigeration for recovering propylene from a propane dehydrogenation process, the process comprising:
partially or fully condensing a purified propane-rich depropanizer overhead stream against a relatively warm cooling medium at relatively high pressure, where the relatively warm cooling medium is at a temperature between about 20° C. and about 50° C. and where the relatively high pressure is between about 10 and about 20 barg;
letting down the liquid purified-rich overhead stream in pressure based on the back-pressure from a propane dehydrogenation reactor; and
partially or fully vaporizing the liquid purified-rich overhead stream against at least one process stream to provide refrigeration, where vaporization pressure is based on back-pressure from the propane dehydrogenation reactor, and where at least a portion of the partially or fully vaporized stream is used as feed to the propane dehydrogenation reactor.