Composition and process for gas dehydration

Patent metadata

Field	Value
Publication number	US-10625202-B2
Application number	US-201615761831-A
Country	US
Kind code	B2
Filing date	Oct 3, 2016
Priority date	Oct 19, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

The present invention relates to a dehydration composition and method of use thereof for drying gas streams, in particular natural gas streams, wherein the dehydration composition comprises (i) a glycol, (ii) a borate compound, (iii) an alkali metal carboxylate, and (iv) an additional glycol different than (i), and/or (v) an additional additive selected from an alkanolamine, a phosphate acid or salt compound, a sweetening agent, a low temperature viscosity improver, a corrosion inhibitor, an antifoaming agent, or mixtures thereof.

First claim

What is claimed is:

1. A gas dehydration composition comprising:
i from 60 to 99.9 weight percent of a glycol,
ii from 0.1 to 10 weight percent of a borate compound,
iii from 0.01 to 10 weight percent of an alkali metal carboxylate,
iv from 0 to 30 weight percent of an additional glycol different than i,
and
v from 0 to 25 weight percent of an additional additive selected from an alkanolamine, a phosphate acid or salt compound, a sweetening agent, a low temperature viscosity improver, a corrosion inhibitor, an antifoaming agent, or mixtures thereof
wherein weight percents are based on the total weight of the dehydration composition.

2. The gas dehydration composition of claim 1 wherein
i the glycol is monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, or glycerol,
ii the borate compound is boric acid, metaboric acid, sodium metaborate, tetraboric acid, sodium tetraborate, potassium tetraborate, their corresponding hydrates, or mixtures thereof,
iii the alkali metal salt is sodium acetate, potassium acetate, sodium formate, potassium formate, sodium bicarbonate, potassium bicarbonate, sodium glycolate, potassium glycolate, sodium lactate, potassium lactate, their corresponding hydrates, or mixtures thereof,
and
iv the additional glycol is the glycol is monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, glycerol, or mixtures thereof.

3. The gas dehydration composition of claim 1 wherein
i the glycol is triethylene glycol,
ii the borate compound is sodium tetraborate,
and
iii the alkali metal salt is sodium acetate.

4. The composition of claim 3 further comprising
iv glycerol in an amount from 0.1 to 30 weight percent.

5. A process for removing water from a gas comprising water using a gas dehydration composition comprising:
i from 60 to 99.9 weight percent of a glycol,
ii from 0.1 to 10 weight percent of a borate compound,
iii from 0.01 to 10 weight percent of an alkali metal carboxylate,
iv from 0 to 30 weight percent of an additional glycol different than i,
and
v from 0 to 25 weight percent of an additional additive selected from an alkanolamine, a phosphate acid or salt compound, a sweetening agent, a low temperature viscosity improver, a corrosion inhibitor, an antifoaming agent, or mixtures thereof
wherein weight percents are based on the total weight of the dehydration composition.

6. The process of claim 5 wherein
i the glycol is monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, or glycerol,
ii the borate compound is boric acid, metaboric acid, sodium metaborate, tetraboric acid, sodium tetraborate, potassium tetraborate, their corresponding hydrates, or mixtures thereof,
iii the alkali metal salt is sodium acetate, potassium acetate, sodium formate, potassium formate, sodium bicarbonate, potassium bicarbonate, sodium glycolate, potassium glycolate, sodium lactate, potassium lactate, their corresponding hydrates, or mixtures thereof,
iv the additional glycol is monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, monopropylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, glycerol, or mixtures thereof.

7. The process of claim 6 wherein
i the glycol is triethylene glycol,
ii the borate compound is sodium tetraborate,
and
iii the alkali metal salt is sodium acetate.

8. The process of claim 7 wherein the gas dehydration composition further comprises
iv glycerol in an amount from 0.1 to 30 weight percent.

9. The process of claim 5 wherein the gas is natural gas.

10. The process of claim 5 comprising the step of:
a contacting said gas in a continuous counter current contact zone with said dehydrating composition to form a water-rich dehydrating composition.

11. The process of claim 10 further comprising the step of:
b regenerating said water-rich dehydrating composition at a temperature of 120° C. to 225° C. to form a lean dehydration composition
and
c using all or part of the regenerated lean dehydration composition, repeat step a.

Assignees

• Dow Global Technologies Llc

Inventors

• Laroche Christophe R
• Hassanzadeh Armin
• Klinker Eric J

Classifications

• B01D53/28 Primary

  Selection of materials for use as drying agents · CPC title

• C10L2290/12

  Regeneration of a solvent, catalyst, adsorbent or any other component used to treat or prepare a fuel · CPC title

• B01D2252/50

  Combinations of absorbents · CPC title

• B01D2252/606

  Anticorrosion agents · CPC title

• B01D2252/2026

  Polyethylene glycol, ethers or esters thereof, e.g. Selexol · CPC title