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By: Chris Wilson For: Senior Capstone 2008. Overview Current process New process Economic comparison.

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Presentation on theme: "By: Chris Wilson For: Senior Capstone 2008. Overview Current process New process Economic comparison."— Presentation transcript:

1 By: Chris Wilson For: Senior Capstone 2008

2 Overview Current process New process Economic comparison

3 Natural Gas Processing The Way it is Done Current process Remove excess water Remove acid gas Dehydrate Remove mercury Remove nitrogen Separate NGL (ethane, and heavier hydrocarbons)

4 Natural Gas Processing Everything Together

5 Water removal Removes free liquid water and condensate gas Sends the gas to a refinery The water goes to waste

6 Natural Gas Processing Everything Together

7 Natural Gas Processing Acid Gas Removal Hydrogen sulfide Mercaptans Carbon dioxide Acid gas removal processes Amine treating Benfield process Sulfinol process others

8 Natural Gas Processing Amine Treatment Most common used amines Monoethanolamine Diethanolamine Diisopropylyamine Methylethanolamine Hydrogen sulfide goes through a Claus process

9 Natural Gas Processing Amine Treating

10 Natural Gas Processing Sulfinol Process Used to reduce H2S, CO2, and mercaptans from gases Great for treating large quantities of gas Solvent absorbs the sour gas Sulfolane is used

11 Natural Gas Processing Sulfinol Process

12 Natural Gas Processing Everything Together

13 Natural Gas Processing Glycol Dehydration Method for removing the water vapor from the gas Usable glycols Triethylene glycol – most commonly used Diethylene glycol Ethylene glycol Tetraethylene glycol Works by having the glycol adsorb the water

14 Natural Gas Processing Glycol Dehydration

15 Pressure Swing Adsorption Adsorbent material is used Gas and material go under high pressure Material adsorbs the gas ( H2S, mercaptans, CO2) Disadvantages Requires high pressures Slow cycle times

16 Natural Gas Processing

17 Mercury removal Current Processes Activated carbon – through chemisorption. Activated has extremely high surface area Mercury can damages aluminum heat exchangers Those used in cryogenic processing plants Those use in liquefaction plants

18 Natural Gas Processing

19 Nitrogen Rejection Processes that can reject nitrogen Cryogenic process Absorption process (using lean oil or solvent) Membrane separation Adsorption process (activated carbon)

20 Natural Gas Processing Cryogenic Process Common refrigerants used Most common method for removal of impurities such as nitrogen Disadvantages Must reach extremely low temperatures Only useful for large scale production

21 Natural Gas Processing Lean Oil Removal Lean oil is fed countercurrent with the wet gas Temperature and pressure are set to allow for the greatest absorption of unwanted gases

22 Natural Gas Processing Membranes Driving force Partial pressure Type of material determine permeability D = diffusion coefficient (cm 2 /s) k = Henrys law sorption coefficient (cm 3 /cm 3 cmHg) P 1 = Permeability of component 1 P 2 = Permeability of component 2

23 Natural Gas Processing Economics

24 Demethanizer

25 The next step is to recover the NGLs Process Cryogenics using a turbo- expander can be used This is the most common Lean oil adsorption can be used here

26 Natural Gas Processing Cryogenic Process

27 NGL recovery

28 Now the rest of the liquid is fed to three units Deethanizer Debutanizer Depropanizer Process Each sent to a distillation column

29 Sweetening NGLs

30 Merox Processes Mercaptan oxidation Removes mercaptans from Propane Butane Larger hydrocarbons

31 Natural Gas Processing Another Process

32 Novel Method Technical information momentarily not available due to IP issues However economics will be compared

33 Novel Method Advantage More cost effective than any previous methods Less environmental impacts than previous methods Separates all contaminants Separates each component Everything is done using one process

34 Novel Method

35 Current Method

36 Economics - Amine Treating

37 Amine Treating - Simulation

38 Economics - Demethanizer

39 Demthanizer - Simulation

40 Economics - Dethanizer

41 Deethanizer - Simulation

42 Economics

43 Built in Error


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