2 replies to this topic

[flangecoupling]

Dear All,

My question is that for the purpose of OTS (operator training simulator ) what is the best way to simulate the seperation of sulfuric acid phase from hydrocarbon for the alkylation unit in a refinery?. Beacause the seperation is difficult to attain using a simple PR equation.

Quick replies will be very helpful.

Regards

[Technical Bard]

The VLE behaviour of high concentration sulfuric acid is difficult to model with a cubic equation of state - because H2SO4 exerts almost no vapour pressure at your process conditions. Thermodynamically, the sulfuric acid is not soluble in the oil - that is why this works at all. And the simulator won't accurately predict the solubility of hydrocarbon in the acid - because it depends on the reaction of some hydrocarbon to form alkyl sulfates (acid-soluble oils). I would model it with a simple component splitter and some factors for the ASO.

[flangecoupling]

Dear Technical Bard,
Thank you very much for your informative reply to my post. But can you explain that what do you mean by ASO ?. Thanks