LPG series from AONG website part.2 Liquefied Petroleum Gas LPG Dehydration

1. Arab Oil & Natural Gas website
Presents

2. Liquefied Petroleum Gas LPG
Part.2
LPG Dehydration

3. Liquid water and/or water vapor are
removed from natural gas to:
 Prevent formation of hydrates in transmission lines.
 Meet a water dew point requirement of a sales gas contract.
 Prevent corrosion.

4. Techniques for dehydrating natural gas
include
 Absorption using liquid desiccants.
 Adsorption using solid desiccants.

5. Absorption using liquid desiccants
 Absorption:
the water in a gas stream is
dissolved in a relatively pure liquid
solvent stream.
 stripping (regeneration):
The reverse process, in which the
water in the solvent is transferred
into the gas phase

6. Adsorption using solid desiccants
 Adsorption
physical phenomenon that
occurs when molecules of a
gas are contact with a solid
surface and some of them
condense on the surface.

7. 150 oF
220
LB/MMSCF
WATER
CONTENT OF
GASES
3%
0.93
26
0.98
At 150°F and 1,000 psia.
W = 220 lb/MMscf
At 26 mw gas ,
Cg = 0.98
W = (0.98)(220)
= 216 lb/MMscf
For 3% brine,
Cs = 0.93
W = (0.93)(220)
= 205 lb/MMscf

8. 80 oF
0.0155
LB W /100LB
propane
Solubility of
Water in Liquid
Hydrocarbons

9. Water Content of High CO2/H2S Gases
Saturated water content higher than that of sweet
natural gas, particularly at high pressure
Corrections for H2S and CO2 should be applied
when the gas mixture contains more than 5% H2S
and/or CO2 at pressures above 700 psia.
The addition of small amounts of CH4 or N2 to
CO2 or H2S can reduce the saturated water
content compared to the pure acid gas.

10. WATER
CONTENT OF
CO2
300
At 88°F and 300 psia.
For Sweet gas
W = 115 lb/MMscf
For CO2
W = 135 lb/MMscf
At 88°F and 2000 psia.
For Sweet gas
W = 27 lb/MMscf
For CO2
W = 180 lb/MMscf
115
135
180
2000
27

11. Addition of small amounts of CH4 to CO2
At 100°F and 2000 psia.
Pure CO2
W = 215 lb/MMscf
5.31% CH4 and 94.69 CO2
W = 140 lb/MMscf
Pure CH4
W = 40 lb/MMscf
2000
215
140
40

12. for more FREE movies, visit:
Arab Oil & Natural Gas website
www.Arab-Oil-NaturalGas.com