Question # $5$Question # $4$

A hydrotreater prepares vacuum gas oil $($VGO$)$ feed to another unit. It is

expected to reduce the sulfur content in the feed from $5\mathrm{.}0wt\%$ to $0\mathrm{.}1wt\%.$ The

feed flow rate is $25,000BPD$ and its density is $870k\frac{g}{m^3}.$ The hydrotreater

operates at a temperature of $410C$ and pressure of $\frac{50}{b}ar.$

a$)$ Calculate production of hydrogen sulphide $(k\frac{g}{h})$ from the unit.

b$)$ What is the conversion across the bed, if the temperature rise across the

bed is limited to $25C.$

Following additional information is given:

Specific heat of feed mixture is $3\mathrm{.}5k\frac{J}{k}g.$C

Average molecular weight of sulfur compounds is $152k\frac{g}{k}$mol.

Average heat of desulfurization reaction $(H_{RA})$ is $-175{10}^{3}k\frac{J}{k}$mol

Hydrocracking is playing increasingly important role in modern petroleum

refinery. Discus's the following aspects of this process.

Chemistry with examples of four reactions

Catalyst function and types

Operating conditions and their significance.