cheme hw, Chemical Engineering

Assignment Help:

Consider a process for the partial oxidation of benzene to produce maleic anhydride (C4H4O4) using air. There are two reactions to be concerned with: The first partially oxidizes the Benzene to produce maleic anhydride along with carbon dioxide and water.

The second, undesired reaction fully oxidizes the benzene. The process used is as follows:

1) Benzene Purification: The benzene flows into a pressurized still with water at 23.2

psia. The liquid in the still is 80% benzene by mass. Energy is supplied to keep the mixture at its boiling point (180°F) resulting in a vapor mixture of pure water (partial pressure = 7.52 psia) and pure benzene (partial pressure = 15.68 psia). The contaminates along with waste benzene flow out as a liquid.

2) Reaction: The vapor stream is mixed with enough air (T = 150°F, 1 atm, 50% relative humidity) to provide an 18/1 molar ratio of oxygen/benzene entering the reactor. At the exit to the reactor an analysis of the gasses (mole, dry basis) shows 0.76% C4H4O4, and 80.0% nitrogen.

3) Stripping: The exit gasses from the reactor flow into a water scrubber operating at 1 atm. Pure water enters the top of the column and the reactor outlet gas enters the bottom. The water "scrubs" out the maleic anhydride where it exits as a liquid at the bottom of the column with a concentration of (mole %) 12% C4H4O4, 88% water.

Exiting the top of the column as a gas are all of the unreacted benzene, oxygen, carbon dioxide, and nitrogen. This gas stream exits at 142°F saturated with water.

4) Drying: The liquid stream from the scrubber goes to a dryer where the water is driven off leaving pure maleic anhydride. What is (use pound moles):

a) The moles of benzene that are completely oxidized in the reactor per mole of benzene fed into the reactor? (i.e. the moles benzene used in the second reaction per mole fed)

b) The pounds of water leaving the dryer per mole of benzene fed into the reactor?

c) The composition of the gas leaving the scrubber (mole percent, wet basis)?

d) The pounds of water added to the top of the scrubber per mole of benzene fed into the reactor?

Related Discussions:- cheme hw

A bugs life, Whats the lifetime of a bugg?

Whats the lifetime of a bugg?

Provision for services-gas, Normal 0 false false false fals...

Normal 0 false false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Distinguish between intrinsic and extrinsic semiconductor, Distinguish betw...

Distinguish between intrinsic and extrinsic semiconductor. In intrinsic semiconductors, the conduction is because of the intrinsic processes characteristics of the crystal, wit

Reference electrodes, construction and working of calomel and Ag-AgCl elect...

construction and working of calomel and Ag-AgCl electodes

Explain with sketch the process of "forging", Explain with sketch the proce...

Explain with sketch the process of "forging". Forging is the process by which metal is heated and is shaped by plastic deformation by suitably applying compressive force. Gener

Polymers, free radical mechanism

free radical mechanism

Applications of dielectric materials, Dielectric materials  1) These ar...

Dielectric materials  1) These are the materials in which valence electrons used are bounded very strongly to their parent atoms. 2) They need very large electric field to r

Homes, Ask questionbats #Minimum 100 words accepted#

Ask questionbats #Minimum 100 words accepted#

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd