Oil field associated gas purification process

According to the characteristics of oil field gas, it is necessary to choose the natural gas purification technology with low investment, simple equipment, small gas processing volume, high operating flexibility and convenient. The following describes several purification processes that are more suitable for oil field gas.
Molecular sieve deacidifying gas
The principle of anti-acid molecular sieve for oil field gas purification is surface adsorption, so the molecular sieve to remove the acid gas of oil field gas has the effect of killing two stones with one stone, which can adsorb both water and sulfur compounds, so the molecular sieve has two transfer points, the first one is water (molecular sieve first adsorb water), the second transfer point is sulfur compounds. In order to achieve the purpose of both desulfurization and dehydration, it should be based on the conversion point of sulfur compounds as the standard, timely switching regeneration.
Solid desulfurizer (SDA) desulfurization technology
SDA technology is a batch gas desulfurization technology, mainly Sulfatreat, sponge iron, Chemsweet, Sulfa-check and so on. Sulfatreat is a batch method for selective removal of hydrogen sulfide and mercaptan from natural gas, carbon dioxide and air. Sulfatreat is a dry flowing material with uniform porosity and permeability. It is composed of 30% single iron compound, 30% montmorillonite and 30% water. It is black and grainy. The Sulfatreat unit should be installed directly downstream of the gas/liquid separator and upstream of the dehydration process unit, with the gas temperature preferably between 2150 ° C and containing saturated water vapor. Sulfatreat is not sensitive to pressure and is not affected by any other component of the gas, and the Sulfatreat process method completely selectively removes hydrogen sulfide and produces no exhaust gas.
Carbonic propylene ester method
Using propylene carbonate to absorb acidic gases such as carbon dioxide is a typical physical process. The process is simple, the number of equipment is small, the energy consumption is small, and the purification cost is low. This method uses propylene carbonate to absorb the load and the partial pressure of carbon dioxide in a linear relationship at a certain temperature, improve the total pressure of the system, in the case of constant carbon dioxide content to increase the partial pressure of carbon dioxide, to achieve the purpose of purifying carbon dioxide. For solvents that dissolve acidic gases such as carbon dioxide, the acid gases such as carbon dioxide are released from the solvent by reducing pressure to normal or negative pressure, so as to achieve the purpose of solvent regeneration and recovery of carbon dioxide acidic gas.
Because the chemical properties of propylene carbonate solvent are stable, less degradation, no corrosion to carbon steel, non-toxic to the human body, the regeneration process does not require external heat, low energy consumption, therefore, especially suitable for processing oil field gas with high carbon dioxide content.