Temperature controlled adsorption process for recovering condensable components from a gas stream

Patent metadata

Field	Value
Publication number	US-10093877-B2
Application number	US-201515514908-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Oct 27, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Disclosed is an improved process for recovering condensable components from a gas stream, in particular, hydrocarbons from a gas stream such as natural gas. The present process uses solid adsorbent media to remove said hydrocarbons wherein the adsorbent media is regenerated in a continuous fashion in a heated continuous counter-current regeneration system, wherein said heated regenerated adsorbent media is cooled prior to reuse.

First claim

What is claimed is:

1. A continuous process for separating hydrocarbons from a gas feedstream comprising methane and one or more of ethane, propane, butane, pentane, or heavier hydrocarbons, consisting of the steps of:
(a) providing one or more adsorbent bed consisting of an adsorbent media selected from a porous cross-linked polymeric adsorbent, a pyrolized macroporous polymer, or mixtures thereof, wherein said adsorbent media adsorbs one or more of ethane, propane, butane, pentane, heavier hydrocarbons, and/or mixtures thereof,
(b) passing the gas feedstream through the one or more adsorbent bed to provide a methane rich gas stream and a loaded adsorbent media,
(c) recovering, transporting, liquefying, combusting, or flaring the methane rich gas stream,
(d) using a heat to regenerate the loaded adsorbent media to produce a heated regenerated adsorbent media and a product gas comprising one or more desorbed ethane, propane, butane, pentane, heavier hydrocarbons, and/or mixtures thereof,
(e) recovering, transporting, liquefying, re-injecting, excluding, by-passing, combusting, or flaring the one or more desorbed ethane, propane, butane, pentane, and/or heavier hydrocarbons individually and/or as mixtures,
(f) cooling the heated regenerated adsorbent media in a cooling unit to form a cooled regenerated adsorbent media wherein the temperature for the cooled regenerated adsorbent media is equal to or greater than 10° F. cooler than the temperature of the heated regenerated adsorbent media prior to entering the cooling unit,
and
(g) introducing the cooled regenerated adsorbent media back into the adsorption bed for reuse.

2. The process of claim 1 wherein the cooling unit is an indirect cooling unit.

3. The process of claim 1 wherein the cooling unit is a direct cooling unit.

4. The process of claim 1 wherein the heating means for regenerating the loaded adsorbent is a heated gas and/or a radiant heat contact exchanger.

5. The process of claim 1 wherein the regeneration of the loaded adsorbent media is achieved by a using a pressure swing adsorption (PSA) process, a temperature swing adsorption (TSA) process, or a combination thereof.

6. The process of claim 1 wherein the heating means for regenerating the loaded adsorbent media is a microwave heating system.

Assignees

• Dow Global Technologies Llc

Inventors

• Dugas Ross E
• Badhwar Ajay N

Classifications

• B01J20/267

  Cross-linked polymers · CPC title

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title

• B01D2257/702

  Hydrocarbons · CPC title

• B01D2253/106

  Silica or silicates · CPC title

• B01D2253/104

  Alumina · CPC title