ACS CP ACS CP Industrial & Process Chemistry 1 — Questions and Answers
Question 1: The Haber-Bosch process synthesizes ammonia from nitrogen and hydrogen at which typical operating conditions?
- 25°C, 1 atm, platinum catalyst
- 150–200°C, 10 atm, vanadium pentoxide catalyst
- 400–500°C, 150–300 atm, iron catalyst with promoters (Correct answer)
- 800°C, 1 atm, nickel catalyst
Correct answer: 400–500°C, 150–300 atm, iron catalyst with promoters
The Haber-Bosch process operates at 400–500°C and 150–300 atm using an iron catalyst with K2O and Al2O3 promoters to achieve commercially viable ammonia yields.
Question 2: In chemical process safety, the 'hierarchy of controls' lists which option as most effective?
- Personal protective equipment (PPE)
- Administrative controls
- Engineering controls (substitution or elimination) (Correct answer)
- Training and procedures
Correct answer: Engineering controls (substitution or elimination)
The hierarchy of controls prioritizes elimination and substitution (inherently safer design) as the most effective controls, followed by engineering controls, then administrative controls, with PPE as the last resort.
Question 3: The Contact Process for sulfuric acid production uses which catalyst?
- Iron (Fe)
- Platinum (Pt)
- Vanadium pentoxide (V2O5) (Correct answer)
- Nickel (Ni)
Correct answer: Vanadium pentoxide (V2O5)
The Contact Process uses vanadium pentoxide (V2O5) catalyst to oxidize SO2 to SO3 at 400–600°C, which is then absorbed in concentrated H2SO4 to form oleum.
Question 4: Which industrial process converts heavy petroleum fractions into lighter, more valuable gasoline-range hydrocarbons?
- Alkylation
- Catalytic cracking (FCC) (Correct answer)
- Polymerization
- Isomerization
Correct answer: Catalytic cracking (FCC)
Fluid catalytic cracking (FCC) breaks down high-molecular-weight petroleum fractions into lighter hydrocarbons (gasoline, olefins) using zeolite catalysts at high temperatures.
Question 5: HAZOP (Hazard and Operability Study) is a systematic process hazard analysis technique that examines:
- Environmental impact of chemical releases using dispersion modeling
- Deviations from design intent using guide words like 'more of,' 'less of,' and 'reverse' (Correct answer)
- Fault tree logic for equipment failure probabilities
- Consequence severity using dose-response relationships
Correct answer: Deviations from design intent using guide words like 'more of,' 'less of,' and 'reverse'
HAZOP uses structured guide words (More, Less, No, Reverse, Other than, As well as, Part of) applied to process parameters to systematically identify hazards and operability problems.
Question 6: The Ostwald process for nitric acid production involves catalytic oxidation of ammonia over which catalyst?
- Iron-molybdenum oxide
- Platinum-rhodium gauze (Correct answer)
- Vanadium pentoxide
- Copper chromite
Correct answer: Platinum-rhodium gauze
The Ostwald process oxidizes NH3 to NO over a platinum-rhodium gauze catalyst at 850–950°C, which is further oxidized and absorbed in water to produce HNO3.
ACS CP ACS CP Industrial & Process Chemistry 1
The Haber-Bosch process synthesizes ammonia from nitrogen and hydrogen at which typical operating conditions?