Contactor flash separator

Rich amine from the bottom of the HjS contactor goes to a flash separator to remove dissolved hydrocarbons from the amine solution. The rich amine is pumped from the separator to the amine regenerator,... 

Flash separator pressure = 500 kPaG Separator retention time = 20 min Approach to equilibrium temperature = 4°C TEG recirculation rate = 0.025 m /kg water removed Contactor internals = bubble cup with 610-mm spacing Rich-glycol outlet temperature = 150°C (from glycol/glycol exchanger) Heat flux for fire tube design = 90,000 kJ/Cm h)... 

Steam coils at the top of the tower maintain the specified temperature gradient across the rotating disc contactor. The higher temperature in the top section of the rotating disc contactor results in separation of the less soluble heavier material from the deasphalted oil mix and provides internal reflux, which improves the separation. The deasphalted oil mix leaves the top of the rotating disc contactor tower. It flows to an evaporator where it is heated to vaporize a portion of the solvent. It then flows into the high pressure flash tower where high pressure solvent vapors are taken overhead. 

After the dispersion leaving the reactor is separated in the settler (decanter), the liquid hydrocarbon product stream is partially flashed, forming a vapor phase, mainly isobutane. The remaining liquid is hence cooled, and it is used as the coolant in the tube bundle of the reactor. As heat is transferred there, more hydrocarbons vaporize, forming a liquid-gas mixture. Obviously, temperature gradients occur on both sides of the tube bundle as a function of reactor length. Heat transfer (and temperature control) is an important design consideration in contactors. 

Function is to strip species from the liquid to produce a quality bottoms product for example, a solvent ready to be recycled as in glycol dehydration, amine absorption, extractive distillation or water that has been stripped of contaminants as in Sour Water strippers deodorize edible oils. Used to regenerate solvent for absorption or extractive or azeotropic distillation. Other equipment that is used for stripping include distillation. Section 4.2, gas-liquid separators. Section 5.1 and gas-liquid-liquid separation in flash drum. Section 5.4. The general characteristics of gas-liquid contacting are described in Section 1.6.1. Other operations that use this type of contactor include gas absorption. Section 4.8 reactors. Sections 6.13-6.16 and 6.19 and direct contact heat exchange Sections 3.7-3.9. 

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