Bioprocessengineering at Universität Für Bodenkultur Wien | Flashcards & Summaries

Lernmaterialien für Bioprocessengineering an der Universität für Bodenkultur Wien

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TESTE DEIN WISSEN

Brazing vs. Soldering vs. Welding

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TESTE DEIN WISSEN
  • Brazing = Hartlöten = Joining possibly dissimilar metal parts with a filler. Might be more stable than the metal itself.
  • Soldering = Löten = like brazing with a lower Temperature (>450°C), possibly joining a wide variety of metals. The joint is usually weaker than the metals joint.
  • Welding = Schweißen, very hot way to join usually steel. The joint is as strong as the metal itself, if done right. Only metals of the same kind can be joint this way.
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TESTE DEIN WISSEN
What 2 large groups of balances do I have in BPE?
(Mathematically) For what balances/processes are they each used?
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TESTE DEIN WISSEN
  1. Integral balance
    • amounts, often for batch process
  2. Differential balance
    • rates, often for continuous processes
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TESTE DEIN WISSEN
How can I influence the kla value?
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TESTE DEIN WISSEN
  • higher rpm on stirrer
  • Higher aeration rate
  • optimisation of container/stirrer geometry
  • Increase of interphase - surface (gas - liqud)
  • optimisation of medium
Lösung ausblenden
TESTE DEIN WISSEN
For what entities (not SI, rather cathegories) can I set up a mass balance?

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TESTE DEIN WISSEN
  1. Total mass/moles
  2. Mass/Moles of chemical compound
  3. Mass/Moles of an atomic species
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TESTE DEIN WISSEN
What is the chronological order of describing a biotech process?
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TESTE DEIN WISSEN
  1. Draw a picture of the system and flows in and out
  2. Label picture
  3. Write general mass balance
  4. Write mass/Species balances
  5. Fill in numbers
  6. Check numbers and units
Lösung ausblenden
TESTE DEIN WISSEN
What is th klA value in BPE?
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TESTE DEIN WISSEN
In Biotechnological processes, kla gives insight into how well the microorganisms are supplied with oxygen.
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TESTE DEIN WISSEN
Difference between Steady state vs continous process?
what do they ech mean and what are their opposites?
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TESTE DEIN WISSEN
The 2 do not necissarily cancel each other out! (often go together)

A continuous process is one where mass enters and leaves. (opposite: batch process)
Steady state, on the other hand defines that process variables do not change over time. (opposite: transient state)
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TESTE DEIN WISSEN
How is klA calculated?
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TESTE DEIN WISSEN
Not at all! It is dependent on so many variables -> it is measured.
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TESTE DEIN WISSEN
What means WCW and DCW? + unit
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TESTE DEIN WISSEN
  • WCW = Wet cell weight (g/L)
  • DCW = Dry cell weight (g/L)
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TESTE DEIN WISSEN
4 Ways to increase chemical reaction rate? (incl. reasons)
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TESTE DEIN WISSEN
  1. Incease surface area (solids) -> more exposed molecules
  2. Increase temperature -> higher mobility -> more prob. meeting
  3. Increase Concentration (liquids) -> -> more exposed molecules -> higher prob. of meeting reactants
  4. Use a catalyst -> lowers necessary reaction entropy
Lösung ausblenden
TESTE DEIN WISSEN
What are the 3 most basic prerequisites for a reaction?
Lösung anzeigen
TESTE DEIN WISSEN
  1. Reactants must collide
  2. Reactants must have the proper energy
  3. Reactants must have the right geometry
Lösung ausblenden
TESTE DEIN WISSEN
Give the most general formula for the mass balance in a batch process!
Lösung anzeigen
TESTE DEIN WISSEN
m(In) - m(out) + m(generated) - m(consumed) = m(accumulated)
Lösung ausblenden
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Q:

Brazing vs. Soldering vs. Welding

A:
  • Brazing = Hartlöten = Joining possibly dissimilar metal parts with a filler. Might be more stable than the metal itself.
  • Soldering = Löten = like brazing with a lower Temperature (>450°C), possibly joining a wide variety of metals. The joint is usually weaker than the metals joint.
  • Welding = Schweißen, very hot way to join usually steel. The joint is as strong as the metal itself, if done right. Only metals of the same kind can be joint this way.
Q:
What 2 large groups of balances do I have in BPE?
(Mathematically) For what balances/processes are they each used?
A:
  1. Integral balance
    • amounts, often for batch process
  2. Differential balance
    • rates, often for continuous processes
Q:
How can I influence the kla value?
A:
  • higher rpm on stirrer
  • Higher aeration rate
  • optimisation of container/stirrer geometry
  • Increase of interphase - surface (gas - liqud)
  • optimisation of medium
Q:
For what entities (not SI, rather cathegories) can I set up a mass balance?

A:
  1. Total mass/moles
  2. Mass/Moles of chemical compound
  3. Mass/Moles of an atomic species
Q:
What is the chronological order of describing a biotech process?
A:
  1. Draw a picture of the system and flows in and out
  2. Label picture
  3. Write general mass balance
  4. Write mass/Species balances
  5. Fill in numbers
  6. Check numbers and units
Mehr Karteikarten anzeigen
Q:
What is th klA value in BPE?
A:
In Biotechnological processes, kla gives insight into how well the microorganisms are supplied with oxygen.
Q:
Difference between Steady state vs continous process?
what do they ech mean and what are their opposites?
A:
The 2 do not necissarily cancel each other out! (often go together)

A continuous process is one where mass enters and leaves. (opposite: batch process)
Steady state, on the other hand defines that process variables do not change over time. (opposite: transient state)
Q:
How is klA calculated?
A:
Not at all! It is dependent on so many variables -> it is measured.
Q:
What means WCW and DCW? + unit
A:
  • WCW = Wet cell weight (g/L)
  • DCW = Dry cell weight (g/L)
Q:
4 Ways to increase chemical reaction rate? (incl. reasons)
A:
  1. Incease surface area (solids) -> more exposed molecules
  2. Increase temperature -> higher mobility -> more prob. meeting
  3. Increase Concentration (liquids) -> -> more exposed molecules -> higher prob. of meeting reactants
  4. Use a catalyst -> lowers necessary reaction entropy
Q:
What are the 3 most basic prerequisites for a reaction?
A:
  1. Reactants must collide
  2. Reactants must have the proper energy
  3. Reactants must have the right geometry
Q:
Give the most general formula for the mass balance in a batch process!
A:
m(In) - m(out) + m(generated) - m(consumed) = m(accumulated)
Bioprocessengineering

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