What is the role of the contactor in a glycol dehydration unit?

What is the role of the contactor in a glycol dehydration unit?

The purpose of a glycol contactor is to remove water from a natural gas stream. When natural gas is produced, it typically contains a large amount of water that can be saturated or is at the water dew point.

Which chemical is used in dehydration unit?

Triethylene Glycol (TEG) Triethylene Glycol is most commonly used in glycol dehydration. It reconcentrates at temperatures between 350° and 400°F, which yields purity of 98.8%.

What is the purpose of methanol injection in gas dehydration?

Methanol injection prevented hydrate formation and proved to be a more efficient and simpler method of controlling gas hydrate formation in gas lines than glycol dehydration.

How does triethylene glycol work?

Triethylene glycol is placed into contact with natural gas, and strips the water out of the gas. Triethylene glycol is heated to a high temperature and put through a condensing system, which removes the water as waste and reclaims the TEG for continuous reuse within the system.

What is Meg used for in oil and gas?

Monoethylene glycol (MEG) is widely used by the oil and gas markets in wellheads and pipelines to prevent hydrate formation at pipeline conditions. In offshore deepwater gas production facilities, where the exposure to lower temperatures in subsea pipelines is common, MEG is used for hydrate inhibition.

Which is used commonly in the dehydration of water?

The reverse reaction, where water combines with hydroxyl groups, is termed hydrolysis or a hydration reaction. Chemicals commonly used as dehydrating agents include concentrated phosphoric acid, concentrated sulfuric acid, hot ceramic and hot aluminum oxide.

What is gas dehydration process?

Gas dehydration is the process of removing water vapor from a gas stream to lower the temperature at which water will condense from the stream; this temperature is called the “dew point” of the gas. Increasing water vapor concentration in inlet feed gas leads to a marked decrease in dehydration efficiency.

Why methanol is the best choice for prevention of hydrate?

Thanks to its chemical properties, Methanol can lower the freezing point of a water-based liquid and increase its boiling point, therefore, it is used as an antifreeze to keep cleaning fluids from freeing.

Is methanol a hydrate inhibitor?

Hydrate inhibitors are used to lower the hydrate formation temperature of the gas. Methanol and ethylene glycol are the most commonly used inhibitors.

Where is triethylene glycol used?

It is used as a dehydrating agent for natural gas processing; as a lubricating and finishing agent for textiles; a constituent in brake fluids, lubricants, antifreeze formulations, wallpaper strippers and in artificial fog solutions; a solvent for printing inks and textile dyes; and is used as an intermediate in the …

How is the heat supplied to the gas reboiler?

The heat is usually supplied through a fire tube in the reboiler in which natural gas is burned. The fire tube is always submerged in the glycol by having the glycol flowing from the reboiler over a weir or pipe, which is higher than the top of the fire tube.

What is the function of the reboiler in the column?

Function of the reboiler The rich glycol leaving the absorber must be regenerated to a high purity so that it can be recirculated to the absorber to continue its dehydration function. The regeneration is accomplished in the reboiler and the still column above the reboiler.

How is treated gas routed through a reboiler column?

The treated gas leaves the contactor at the top through a mist eliminator and usually meets the specified water content. The rich glycol can be routed through a heat exchange coil in the top of the reboiler column called the still.

What is a thermo dehydration unit?

Some types of dehydration units may be referred to as a thermo or stack pack. Figure 1. A diagram outlining the operation of a glycol dehydration unit. The gas is treated with a chemical that is hygroscopic, meaning it will absorb the water vapor in the gas.