Chemical Engineering Answers

Soda ash is also called as

a) Sodium hydroxide

b) sodium carbonate

c) Sodium bicarbonate d) none of these.

6)The principal raw materials for the manufacture of soda ash by Solvay's method are. a) Limestone and potassium chloride

b) dolomite and sodium hydroxide

c)Limestone, brine and coal

d) coal and caustic soda

5)The most favorable conditions of temperature and pressure for oxidation of sulfur dioxide to sulfur trioxide are

a) Low temperature high pressure b) low temperature low pressure c) High temperature high pressure d) high temperature low pressure

4)Catalyst used in the production of ammonia from synthesis gas.

a) V₂05

c) Porous iron

b) Al₂O3 d) Nickel

3)Production of urea from ammonium carbamate is a

a) Dehydrogenation reaction e) De-nitration reaction

b) De-oxidation reaction d) Dehydration reaction

2.------present in the molten sulfur deteriorates the platinum catalytic activity?

a) H₂SOA

c) Phosphorous

b) Arsenic

d) Coke

A petrochemical plant in Jurong Island produces formaldehyde (CH2O) industrially by the catalytic oxidation of methanol (CH3OH). The following is the chemical reaction: CH3OH + ½O2 → CH2O + H2O --- (Equation 1) Unfortunately, a significant portion of the formaldehyde will react with oxygen to produce CO and H2O. The following is the side reaction: CH2O + ½O2 → CO + H2O --- (Equation 2) Assume twice the stoichiometric amount of air needed for oxidation (include Equation (1) and Equation (2)) is fed to the reactor. The conversion of methanol is 90% in the reactor. The outlet stream of the reactor was analysed and found to be 150 kg/hr of formaldehyde, 30 kg/hr of CO and other components.

(i) Determine the mass flowrate (kg/hr) of Stream A. ( 4 marks ) (ii) Determine the molar flowrate (kg-moles/hr) of Stream B. ( 4 marks ) (iii) Determine the mass flowrate (kg/hr) of water in the outlet stream. ( 4 marks ) (iv) Determine the molar composition in the outlet stream. ( 5 marks )

A petrochemical plant in Jurong Island produces formaldehyde (CH2O) industrially by the catalytic oxidation of methanol (CH3OH). The following is the chemical reaction: CH3OH + ½O2 → CH2O + H2O --- (Equation 1) Unfortunately, a significant portion of the formaldehyde will react with oxygen to produce CO and H2O. The following is the side reaction: CH2O + ½O2 → CO + H2O --- (Equation 2) Assume twice the stoichiometric amount of air needed for oxidation (include Equation (1) and Equation (2)) is fed to the reactor. The conversion of methanol is 90% in the reactor. The outlet stream of the reactor was analysed and found to be 150 kg/hr of formaldehyde, 30 kg/hr of CO and other components.