24-07-2012, 02:23 PM
NATURAL GAS TREATMENT PROCESSES
NATURAL GAS TREATMENT PROCESSES .ppt (Size: 1,020.5 KB / Downloads: 72)
Acid Gas Treatment
Physical absorption
selective absorption solvent is used.
2. Physical adsorption
solid adsorbent is used.
3. Chemical absorption
solvent (a chemical) capable of reacting reversibly with the acid gases is used
Acid Gas Treatment: Physical Absorption
Processes:- Selexol, the Sulfinol,and the Rectisol
The solvent, or absorbent, is a liquid that selectively absorbs the acid gases and leaves out the hydrocarbons.
In the Selexol process for example, the solvent is dimethyl ether of polyethylene glycol.
Raw natural gas is contacted with the proper solvent in a countercurrent Packed Bed Absorber. See Figure below:-
What are Hydrates:
They are solid white compounds formed from a physical-chemical reaction between hydrocarbons and water under the high pressures and low temperatures used to transport of NG via pipeline.
Hydrates reduce pipeline efficiency.
NG is treated with glycols.
Ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) are typical solvents for water removal.
TEG is preferable (low vapor pressure less glycol loss)
INTRODUCTION
NG and crude oils are main sources for hydrocarbon intermediates or secondary raw materials for the production of petrochemicals.
Ethane and LPG olefins and diolefins.
Methane synthesis gas methanol and ammonia.
Refinery gases from different crude oil processing schemes olefins and LPG.
Crude oil distillates and residues olefins and aromatics via cracking and reforming processes.