++++ Introduction

sweetening/acid removal is the process of removing them.

Natural gas sweetening methods include absorption processes, cryogenic

processes, adsorption processes (PSA, TSA and iron sponge) and

membranes. Often hybrid combinations are used, such as cryogenic and

membranes.

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Gas treatment may also include calibration. If the delivery specification is for

a specific calorific value (BTU per scf or MJ per scm), gas with higher values

can be adjusted by adding an inert gas, such as nitrogen. This is often done

at a common point such as a pipeline gathering system or a pipeline onshore

terminal.

Raw natural gas from the well consists of methane as well, as many other

smaller fractions of heavier hydrocarbons and various other components.

Natural gas is characterized in several ways dependent on the content of

these components:

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