Reactor Design & Scale-up interview questions

1. A.batch suits small volumes, multi-product plants and long reaction times; continuous suits large single-product plants with steady quality
2. B.loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
3. C.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
4. D.RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up

Answer + AI explanation with Pro

1. A.Catalyst deactivation
2. B.Residence time
3. C.Batch vs continuous selection
4. D.Semi-batch dosing

Answer + AI explanation with Pro

1. A.Batch vs continuous selection — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
2. B.Batch vs continuous selection — adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
3. C.Batch vs continuous selection — temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
4. D.Batch vs continuous selection — batch suits small volumes, multi-product plants and long reaction times; continuous suits large single-product plants with steady quality

Answer + AI explanation with Pro

1. A.average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
2. B.adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
3. C.constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
4. D.jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow

Answer + AI explanation with Pro

1. A.Kinetics from lab data
2. B.Catalyst deactivation
3. C.Residence time
4. D.Semi-batch dosing

Answer + AI explanation with Pro

1. A.Residence time — average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
2. B.Residence time — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
3. C.Residence time — differential (rate against concentration) or integral (fit concentration-time to an assumed order) analysis of batch data, with Arrhenius fitting across temperatures
4. D.Residence time — loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins

Answer + AI explanation with Pro

1. A.controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
2. B.jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
3. C.RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
4. D.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process

Answer + AI explanation with Pro

1. A.Adiabatic temperature rise
2. B.Kinetics from lab data
3. C.Reaction calorimetry
4. D.Heat removal on scale-up

Answer + AI explanation with Pro

1. A.Heat removal on scale-up — jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
2. B.Heat removal on scale-up — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
3. C.Heat removal on scale-up — loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
4. D.Heat removal on scale-up — average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions

Answer + AI explanation with Pro

1. A.controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
2. B.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
3. C.average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
4. D.adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes

Answer + AI explanation with Pro

1. A.Kinetics from lab data
2. B.Batch vs continuous selection
3. C.Semi-batch dosing
4. D.Catalyst deactivation

Answer + AI explanation with Pro

1. A.Semi-batch dosing — jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
2. B.Semi-batch dosing — adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
3. C.Semi-batch dosing — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
4. D.Semi-batch dosing — constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first

Answer + AI explanation with Pro

1. A.differential (rate against concentration) or integral (fit concentration-time to an assumed order) analysis of batch data, with Arrhenius fitting across temperatures
2. B.RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
3. C.jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
4. D.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process

Answer + AI explanation with Pro

1. A.Heat removal on scale-up
2. B.Adiabatic temperature rise
3. C.Residence time
4. D.Catalyst deactivation

Answer + AI explanation with Pro

1. A.Adiabatic temperature rise — temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
2. B.Adiabatic temperature rise — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
3. C.Adiabatic temperature rise — constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
4. D.Adiabatic temperature rise — loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins

Answer + AI explanation with Pro

1. A.controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
2. B.jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
3. C.adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
4. D.RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up

Answer + AI explanation with Pro

1. A.Time to maximum rate
2. B.Semi-batch dosing
3. C.Catalyst deactivation
4. D.Reaction calorimetry

Answer + AI explanation with Pro

1. A.Reaction calorimetry — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
2. B.Reaction calorimetry — constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
3. C.Reaction calorimetry — temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
4. D.Reaction calorimetry — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry

Answer + AI explanation with Pro

1. A.jacket duty is limited by U·A·ΔT, and since area scales with volume to the two-thirds power, heat removal per unit volume falls as vessels grow
2. B.constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
3. C.loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
4. D.adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes

Answer + AI explanation with Pro

1. A.Kinetics from lab data
2. B.Catalyst deactivation
3. C.Mixing scale-up criteria
4. D.Batch vs continuous selection

Answer + AI explanation with Pro

1. A.Mixing scale-up criteria — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
2. B.Mixing scale-up criteria — constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
3. C.Mixing scale-up criteria — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up
4. D.Mixing scale-up criteria — differential (rate against concentration) or integral (fit concentration-time to an assumed order) analysis of batch data, with Arrhenius fitting across temperatures

Answer + AI explanation with Pro

1. A.average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
2. B.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
3. C.constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first
4. D.differential (rate against concentration) or integral (fit concentration-time to an assumed order) analysis of batch data, with Arrhenius fitting across temperatures

Answer + AI explanation with Pro

1. A.Kinetics from lab data
2. B.Time to maximum rate
3. C.Adiabatic temperature rise
4. D.Mixing scale-up criteria

Answer + AI explanation with Pro

1. A.Kinetics from lab data — adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
2. B.Kinetics from lab data — loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
3. C.Kinetics from lab data — differential (rate against concentration) or integral (fit concentration-time to an assumed order) analysis of batch data, with Arrhenius fitting across temperatures
4. D.Kinetics from lab data — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry

Answer + AI explanation with Pro

1. A.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
2. B.adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
3. C.loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
4. D.constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first

Answer + AI explanation with Pro

1. A.Semi-batch dosing
2. B.Reaction calorimetry
3. C.Time to maximum rate
4. D.Catalyst deactivation

Answer + AI explanation with Pro

1. A.Time to maximum rate — adiabatic time for a runaway to reach peak rate; under 24 h at the maximum synthesis temperature demands safety measures in Stoessel's criticality classes
2. B.Time to maximum rate — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
3. C.Time to maximum rate — batch suits small volumes, multi-product plants and long reaction times; continuous suits large single-product plants with steady quality
4. D.Time to maximum rate — RC1-type measurement of heat release rate, total enthalpy and accumulation to fix safe dosing rates and cooling requirements before scale-up

Answer + AI explanation with Pro

1. A.average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
2. B.temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process
3. C.loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
4. D.constant power per unit volume, tip speed or blend time cannot all be held together, so the controlling mechanism must be chosen first

Answer + AI explanation with Pro

1. A.Kinetics from lab data
2. B.Reaction calorimetry
3. C.Heat removal on scale-up
4. D.Catalyst deactivation

Answer + AI explanation with Pro

1. A.Catalyst deactivation — loss of activity by sintering, coking or poisoning, handled by regeneration cycles, guard beds and end-of-run temperature margins
2. B.Catalyst deactivation — controlled addition of one reactant so accumulation stays low and the reaction remains dosing-controlled, the main defence against runaway in exothermic batch chemistry
3. C.Catalyst deactivation — average time material spends in a flow reactor, equal to reactor volume divided by volumetric flow at reactor conditions
4. D.Catalyst deactivation — temperature increase if all reaction heat stayed in the mass, ΔH·C/(ρ·Cp); values above about 50 K flag a runaway-prone process

Answer + AI explanation with Pro