System and Method For PH Control Of Lean MEG Product From MEG Regeneration and Reclamation Packages

Patent metadata

Field	Value
Publication number	US-2016101403-A1
Application number	US-201514973443-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Sep 29, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A lean MEG stream having a first pH level is contacted with a CO 2 -rich gas stream to yield a lean MEG product having a second different and lower pH level preferably in a range of 6.5 to 7.0. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the lean MEG stream being a MEG regeneration section of the package. The CO 2 -rich gas could be a vented CO 2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO 2 overdosing of the lean MEG stream does not lead to rapid acidification of the lean MEG product to be stored or injected.

First claim

What is claimed:

1 . A system for adjusting a pH level of a MEG stream, the system comprising:
a vessel having an inlet to receive a MEG stream and ported to receive a CO 2 -rich gas, the MEG stream and CO 2 -rich gas coming into contact with one another within the vessel.

2 . A system according to claim 1 , the MEG stream having a first pH level when entering the vessel and, after coming into contact with the CO 2 -rich gas, having a second different pH level when exiting the vessel.

3 . A system according to claim 2 wherein an amount of the CO 2 -rich gas is at least equal to a stoichiometric quantity effective for achieving a desired second lower pH level.

4 . A system according to claim 3 wherein the amount of CO 2 -rich gas exceeds the stoichiometric quantity.

5 . A system according to claim 2 wherein the second different pH level is at least 6.

6 . A system according to claim 2 wherein the second different pH level is 7.

7 . A system according to claim 1 further comprising a source of the CO 2 -rich gas is a vented CO 2 stream from a MEG reclamation unit.

8 . A system according to claim 1 wherein the MEG stream is mixed with a second MEG stream having a different pH level than a pH level of the MEG stream.

9 . A system according to claim 8 further comprising a source of the second MEG stream is a MEG reclamation unit.

10 . A system according to claim 8 wherein the second MEG stream has a pH level of 7.

11 . A system according to claim 1 further comprising a source of the MEG stream is a MEG regeneration unit.

12 . A system according to claim 11 wherein a portion of the MEG stream exiting the regeneration unit is routed to a reclamation unit.

Assignees

• Cameron Solutions Inc

Inventors

• Messenger Brian E

Classifications

• B01J2219/00177

  controlling the pH · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title

• B01J19/24 Primary

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title

• B01D53/263

  by absorption · CPC title

• C07C29/88

  by treatment giving rise to a chemical modification of at least one compound (chemisorption C07C29/76) · CPC title