Raw Methane (Natural Gas) is collected from a group of adjacent wells and is fir

Question

Raw Methane (Natural Gas) is collected from a group of adjacent wells and is first processed at the collection point for removal of free liquid water and natural gas condensate. The condensate is then transported to a petroleum refinery and the water is disposed of as wastewater.
The raw gas was subsequently pipelined to a gas processing plant where it is initial purified to remove of acid gases (hydrogen sulfide and carbon dioxide). The purification process was performed by treating the natural gas with Amine.

The acid gases removed by amine treatment are then routed into a sulfur recovery unit which converts the hydrogen sulfide in the acid gas into elemental sulfur. There are a number of processes available for that conversion, but the Claus Process is by far the one usually selected. The residual gas from the Claus process is commonly called ''tail gas'' and that gas is then processed in a tail gas treating unit (TGTU) to recover and recycle residual sulfur-containing compounds back into the Claus unit. Again, as shown in the flow diagram, there are a number of processes available for treating the Claus unit tail gas. The final residual gas from the TGTU is incinerated. Thus, the carbon dioxide in the raw natural gas ends up in the incinerator flue gas stack. The next step in the gas processing plant is to remove water vapor from the gas using either the regenerable absorption in liquid triethylene glycol (TEG), commonly referred to as glycol dehydration, or a pressure swing adsorption (PSA) unit which is regenerable adsorption using a solid adsorbent. Other impurities such as mercury, nitrogen were remove. Mercury is then removed by using adsorption processes such as activated carbon or regenerable molecular sieves followed by a subsequent removal and rejection of Nitrogen through a cryogenic process.
The next step is to recover the natural gas liquids (NGL) for which most large, modern gas processing plants use another cryogenic low temperature distillation process involving expansion of the gas through a turbo-expander followed by distillation in a demethanizing fractionating column. Some gas processing plants use a lean oil absorption process rather than the cryogenic turbo-expander process.The residue gas from the NGL recovery section is the final, purified sales gas which is pipelined to the end-user markets.

1.State the number of units involve in the purification process of Raw Methane (Natural Gas) to the final purified sales gas which is pipelined to the end user

2. Ascribe names to each unit identified

Explanation / Answer

1.Natural gas processing consists of seperating first, all impurities found including acid gases,water vapor, and inert gases,This stage is called Gas Treatment.Sweetening of sour natural gas is the initial purification

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