Bubble point product specification, temperature

Depending on the initial guesses, the calculated value of B may not equal the sp>ecified B. A calculated B higher than specified indicates that t and are too low, and that the bottom product contains excessive lights. An addition trial is then needed, at higher and/or t . Usually, the estimated feed temperature is raised this raises both and ce the top and bottom temperatures are fixed by the products dew and bubble points, they are best maintained constant until Bxg adds up to the specified amount. Conversely, if the calculated Bxg is lower than specific, the estimated feed temperature s uld be lowered. The above is analo gous to an operator adjusting the control temperature to obtain a desired split. 

---