Methods and apparatuses for purifying crude propane

Patent metadata

Field	Value
Publication number	US-10829425-B2
Application number	US-202016823006-A
Country	US
Kind code	B2
Filing date	Mar 18, 2020
Priority date	Apr 25, 2018
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

Systems and methods for purifying crude propane streams are provided herein. For example, in some embodiments, methods are provided including passing a crude propane stream to a fixed bed reactor containing a Beta zeolite configured to reduce the propylene oxide content of the crude propane stream and produce a propylene-treated stream and contacting the propylene-treated stream with an acetaldehyde scavenger to produce a treated propane stream. In some embodiments, methods are provided including passing a crude propane stream through a water wash system to provide a treated propane stream having a lower propylene oxide content, a lower acetaldehyde content, or both.

First claim

What is claimed is:

1. A reactor for purifying a crude propane stream, the reactor comprising:
a fixed bed reactor having a crude propane stream inlet, the crude propane stream comprising propane, propylene oxide, acetaldehyde, and propylene;
the fixed bed reactor comprising a Beta zeolite configured to contact the crude propane stream, reduce the propylene oxide content of the crude propane stream, and produce a first treated propane stream; and
an acetaldehyde scavenger system configured to contact one or more of the crude propane stream and the first treated propane stream with one or more acetaldehyde scavengers under conditions sufficient to reduce the acetaldehyde content of the one or more of the crude propane stream and the first treated propane stream.

2. The reactor system of claim 1 , wherein the acetaldehyde scavenger system comprises a static mixer configured to mix at least a portion of the one or more of the crude propane stream and the first treated propane stream with an acetaldehyde scavenger to produce a second treated propane stream.

3. A propane production system comprising:
a first system configured to produce a first hydrocarbon stream comprising C3 hydrocarbons;
a distillation column configured to separate propylene and propane and produce a crude propane stream;
the reactor of claim 1 configured to purify the crude propane stream.

Assignees

• Lyondell Chemical Tech Lp

Inventors

• Keyvani Majid

Classifications

• C07C7/148 Primary

  by treatment giving rise to a chemical modification of at least one compound · CPC title

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title

• C07C7/005

  Processes comprising at least two steps in series · CPC title

• C07C7/13 Primary

  by molecular-sieve technique · CPC title

• C07D301/32

  Separation; Purification · CPC title