The effect of coal tar on MDEA
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What is the impact of coal tar on MDEA desulfurization?
It is mainly the contamination of the solvent by impurities such as coke dust, as well as the impact on the flowability of the trays, which causes the efficiency of solvent absorption to gradually decline!
Some discussions on MDEA mention a \"oil skimming\" operation that takes place in a flash tank. What is this process? Could you explain it? Thank you
The MDEA used in sulfur plants is generally a water-soluble solvent; the presence of oil will inevitably affect the absorption efficiency of the solvent! At this point, it is necessary to carry out the flash operation you mentioned in advance on the solvent, which is simply the separation of oil, gas, and liquid. The solvent containing a small amount of oil enters the flash tank and comes into direct or indirect contact with low-pressure steam, and separation is achieved due to the difference in boiling points between the oil vapor and the solvent. It is personally recommended to use a contactless method for flashing in order to avoid affecting the solvent concentration!