2 replies to this topic

[equilibrium]

Can someone explain what exactly happens to products when we steam strip the bottom of a crude column in releation to product properties, and D86 5% and 95% points for side draws right above the bottom stripping zone and the ovhd product?

 

For instance when we steam strip the bottom of the column will the D86 95% point of the first product draw above the bottom steam stripping section increase or decrease.  I would think that the D86 95% point will decrease due to the entrained light ends in the heavy bottoms moving up the column.

 

[Chellani]

Both D86 T95 of of side draw and T05 of bottoms will increase.

[neel_avi]

Introduction of steam above the liquid pool in the column, reduces the partial pressure of the component to be stripped in the vapor phase  below the vapor pressure of that fluid component at that temperature, thus enabling, that component's liquid counterpart to boil out from the liquid pool.

 

ASTM D86 95% will increase substantially w.r.t D86 5%, but both will increase. 

 

Regards

 

Avijit