Chemical Engineering January 2018 - 54

0.006
0.005
0.004
0.003
0.002
0.001
Benzene
Toluene
Ethylbenzene
p-Xylene
Operation condition
Parameter
Wet gas flowrate
Contactor pressure
Value
10 million std. m3/d
80 bara
Lean glycol circulation rate 4 m3/h
30
11 - 15 June 2018
Frankfurt am Main
40
Contactor temperature, °C
FIGURE 3. The contactor temperature is another parameter that affects BTEX
concentration in the glycol
saturation water content of the natural gas. The presence
of acid gases in the TEG solution lowers its pH and
enhances corrosion in the glycol circuit.
In addition, another major concern is dealing with the
emission of BTEX and H2S from the still regenerator. In most
countries, these components are considered hazardous
air pollutants, and emissions of these components are
strictly regulated.
Operating and maintenance issues
TEG units are typically capable of operating with few
issues. However, there are some problem areas that
can occur when the circulating glycol solution gets
dirty. To ensure trouble-free operation, it is necessary
to recognize these problems and know how
to prevent them. Some of the major problems are
as follows:
* Foaming
* Corrosion and fouling
* Glycol losses
* Thermal degradation of glycol
* Salt contamination
* Sludge formation
* Oxidation
* Low pH
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Although there are several additional concerns, this
article limits the discussion to the mitigation of foaming,
corrosion and fouling, low pH problems and the effects
of aromatics and acid gases.
Foaming
One of the most serious and common problems encountered
in gas dehydration units is foaming. The
root cause of foaming is often difficult to identify. However,
if the circulating glycol solution is not continually
cleaned by filtration, then it can cause foaming. Some
of the major factors that promote foaming are entrained
hydrocarbon liquids, dissolved aromatics, H2S
in the glycol, salt contamination, field corrosion inhibitors,
excessive turbulence and high vapor-to-liquid
contacting velocities.
www.achema.de
For details visit adlinks.chemengonline.com/70302-09
52
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
JANUARY 2018
Corrosion and fouling
Corrosion is another major issue in glycol dehydration
units. A pure glycol solution is non-corrosive to carbon
steel. However, the presence of impurities in the glycol
solution causes corrosion to occur. The impurities may
come from oxidation or thermal decomposition of the
glycol, or they may enter into the solution from the gas
stream, which is subjected to upstream purification and
processing. Glycol can react with sulfur compounds
50
Mole fraction

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Chemical Engineering January 2018

Table of Contents for the Digital Edition of Chemical Engineering January 2018

Contents
Chemical Engineering January 2018 - Cover1
Chemical Engineering January 2018 - Cover2
Chemical Engineering January 2018 - Contents
Chemical Engineering January 2018 - 2
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Chemical Engineering January 2018 - Cover3
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