Bissoy.com
Doctors Medicines MCQs Q&A

Increasing the contact time in oxidation of naphthalene yields better quality of phthalic anhydride.

Increasing the contact time in oxidation of naphthalene yields better quality of phthalic anhydride. Correct Answer True

A longer contact time of 10 seconds in a fluid bed catalytic reactor yields better product than a contact time of 0.1 – 0.4 seconds in a fixed bed multi tubular reactor. The yields are equivalent and almost no maleic acid if produced, thus giving very high purity phthalic anhydride product.

Related Questions

A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0.2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 * 10 –6 m2/sec Kinematic viscosity of air = 1.5 * 10 –5 m2.sc Concentration of naphthalene at the air-solid naphthalene interface = 1 * 10 – 5 kmol/m3 Calculate the overage mass transfer coefficient over the flat plate. Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation. Nu = 0.664 ReL1/2 Pr1/3 you may use analogy between mass and heat transfer.
Can manufacture of phthalic anhydride from oxidation of naphthalene be improved?
Why is the liquid naphthalene fed through nozzles directly to the bottom of the reactor, in the fluidized bed for phthalic anhydride production?
In the reaction of naphthalene to phthalic anhydride, what is the intermediate formed?
A 70 kg tea powder contains mixture from two qualities. Some amount of quality 1 tea powder is added so that ratio of quality 1 to quality 2 becomes 5 : 4. What is the extra amount of of quality 2 to be added so that, quality 2 becomes double the amount of quality 1 in new mixture. Given: current quality 1 exceeds quality 2 in old mixture by 10 kg?
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
Phthalic anhydride is produced by the oxidation of
Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
Consider the following statements: In case of helical gears, teeth are cut at an angle to the axis of rotation of the gears. 1) Helix angle introduces another ratio called axial contact ratio. 2) Transverse contact ratio is equal to axial contact ratio in helical gears. 3) Large transverse contact ratio does not allow multiple teeth to share the load. 4) Large axial contact ratio will cause larger axial force component Which of the above statements are correct?
Molten phthalic anhydride is stored in a/an __________ vessel.