In this Tip of The Month (TOTM), regeneration of rich triethylene glycol (TEG) with striping gas at high pressure is investigated. Specifically, this study focusses on the determination of the required stripping gas rate as a function of the lean TEG mass percent, reboiler temperature, and the number of theoretical trays in the stripping sectionContinue Reading
For dehydration of natural gas by triethylene glycol (TEG) process to a lower water content/water dew point temperature a higher lean TEG concentration is required. To achieve a higher lean TEG concentration at a specified reboiler temperature and pressure, commonly a stripping gas is used. Stripping is defined as a physical separation process by whichContinue Reading
In gas dehydration service, triethylene glycol (TEG) will absorb limited quantities of BTEX (benzene, toluene, ethylbenzene, and xylene) and acid gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) from the gas. Predicted absorption levels for acid gases can be as high as about 10 SCF/gallon (75 SCM/m3) of TEG solution and depends onContinue Reading
BTEX stands for benzene, toluene, ethylbenzene, and xylene, a group of compounds all that also belong to the broader category of Hazardous Air Pollutants (HAPs). Benzene is a known carcinogen, and has also been shown to cause blood disorders and to impact the central nervous system and the reproductive system. Toluene may affect the reproductive and central nervousContinue Reading
Glycol dehydration is the most common dehydration process used to meet pipeline sales specifications and field requirements (gas lift, fuel, etc.). Triethylene glycol (TEG) is the most common glycol used in absorption systems. Chapter 18, Gas Conditioning and Processing [1] presents the process flow diagram and basics of glycol units. A key parameter in sizingContinue Reading
The formation of hydrates in processing facilities and pipelines has been a problem to the natural gas industry. Whether the problem occurs in transportation or processing, hydrate formation can cause shutdowns and even destruction of valuable equipment. Because of these devastating and often costly consequences of hydrate formation, methods have been applied to prevent hydrateContinue Reading
In order to continue the last tip of the month’s discussion on MEG injection plant, in this “Tip of the Month”, we will focus on two more questions: Does MEG have any dehydration ability at the three phase cold separator condition of a typical mechanical refrigeration plant? What is the dehydration ability of MEG ifContinue Reading
In this “Tip of the Month”, we will focus on the question of: Which technology should you choose? The answer, of course, is “It depends.” It depends on what you are trying to accomplish, the constraints imposed on your system and the relative economics. A Rule of Thumb is “Use MEG injection if you haveContinue Reading
This Tip of the Month shows how a Short Cut Method (SCM), after one Performance Test Run (PTR), may be used to estimate the life of a Type 4A molecular sieve dehydrating a water-saturated feed of natural gas. The May 2015 Tip of the Month [1] discussed the benefits of standby time. In that Tip (whichContinue Reading
Benzene, toluene, ethylbenzene, and xylene are members of the aromatics hydrocarbon family group, often referred to as BTEX. These aromatic compounds are also belonged to the broader category of Hazardous Air Pollutants (HAPs). Benzene is a known carcinogen and has also been shown to cause blood disorders and to impact the central nervous system andContinue Reading