________ injection downstream of the desalter is another common method used to reduce the amount of HCl going overhead.
A) Hydrogen
B) Nitrogen
C) Water
D) Caustic

Question

Quizplus · Accepted Answer

Caustic injection (also known as alkaline injection) is the preferred method for neutralizing the HCl in the overhead stream because it reacts with the acid to form salt and water, which are easily separated from the hydrocarbon product. Hydrogen injection can also be used, but it requires careful control to avoid over-reduction and the formation of hazardous hydrogen sulfide (H2S) gas. Nitrogen and water injection do not have any neutralizing properties and can actually increase the volatility of the HCl, making the problem worse.

________ Injection Downstream of the Desalter Is Another Common Method