Taking a Route into Flow and Onto Scale · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.
به انگلیسی

From flask to flow

Science · Chemistry · ages 23-24
Name ______________________   Date ____________

  1. Which approach accounts for transport changes when enlarging a batch vessel?

    • Copy temperature and stirrer speed; assume transport is unchanged
    • Reassess mixing, heat removal and operating conditions
    • Keep concentration fixed; assume cooling scales with volume

  2. Which observation most directly identifies a heat-removal bottleneck during scale-up?

    • Heat generation outruns heat removal
    • Heat release remains low and controlled
    • Slow equilibration occurs at a fixed temperature

  3. A small-volume flow reactor can still overpressurise if its outlet becomes blocked.

    Circle one:   True   False

  4. A proposed flow specification lists only concentration and mean residence time. What further information is needed for a repeatable, safety-assessed procedure?

    • Only pump capacity; temperature and pressure follow from residence time
    • Only reactor volume; feed composition and shutdown controls are optional
    • Feed rates, layout, operating conditions, monitoring and shutdown controls

  5. Under steady, incompressible flow, a 6 mL reacting channel has total flow 2 mL/min. What is its mean residence time in minutes?

    Answer: ______________

  6. At the same intermediate concentration, replacing a 10 L reacting batch with a 10 mL reacting flow volume directly reduces what?

    • Intermediate amount in the reacting zone
    • Chemical instability of each intermediate molecule
    • Every pressure and downstream collection hazard

  7. An already well-mixed homogeneous reaction moves to flow at unchanged temperature and composition. What follows solely from changing the vessel?

    • Intrinsic rate must rise because feed enters continuously
    • The reaction must stop because the vessel is not batch
    • No automatic increase in intrinsic rate

  8. For the same task, batch equipment is quoted at $400 and flow equipment at $1,600. What is the quoted capital-cost difference, excluding running costs?

    • $1,200 less for flow
    • $1,200 more for flow
    • No difference between the quoted units
LightMySky · lightmysky.comW1-mt_eOjBPoeZSf-s1

Answer key

For grown-ups. Fold this page away before handing over the rest.

From flask to flow W1-mt_eOjBPoeZSf-s1

  1. Reassess mixing, heat removal and operating conditions · Matching a few operating settings does not show that mixing or cooling will also match. Reassess both at the larger scale.
  2. Heat generation outruns heat removal · When heat is generated faster than it leaves, heat accumulates and temperature can rise.
  3. True · Low reacting inventory does not prevent pressure accumulation behind a blockage.
  4. Feed rates, layout, operating conditions, monitoring and shutdown controls · Concentration and mean residence time do not determine the full setup or its controls. Record the feeds, reactor, conditions and safety arrangements.
  5. 3 · Mean residence time is V/Q = 6 mL divided by 2 mL/min = 3 min.
  6. Intermediate amount in the reacting zone · Inventory is concentration times volume. The reacting inventory is 1,000 times smaller, but molecular instability and other hazards remain.
  7. No automatic increase in intrinsic rate · The vessel alone does not change intrinsic kinetics under unchanged conditions. Transport improvements or different conditions can change observed rates.
  8. $1,200 more for flow · $1,600 - $400 = $1,200. This describes the given quotes, not every batch and flow system.
Worksheet · LightMySky