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CAPE1010 > Semester 2 Reaction Engineering > Flashcards

Semester 2 Reaction Engineering Flashcards

1
Q

What are the 3 steps for a chemical reactor process

A

Mixing, reaction, separation

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2
Q

What is homogenous chemical reaction

A

Single phase chemical reaction

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3
Q

What is a heterogeneous chemical reaction

A

Reacting taking place with at least 2 distinct phases

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4
Q

What is the function of catalyst

A

Increase ror without getting used up

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5
Q

What us mass balance

A

Accounting materials entering, converting, accumulating and leaving within the reactor

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6
Q

What is energy balance

A

Accounting heat entering, leaving, accumulating, forming Orr disappearing from or within g the reactor

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7
Q

What is stoichiometry

A

Moles of reactant react to yield of product produced

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8
Q

Rate law equation

A

-rA=kCna

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9
Q

What is contacting in chemical reaction

A

How reactants are connected for the reaction to take place in a reaction plant

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10
Q

What is the performance equation

A

Output=f(input,kinetics,contacting)

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11
Q

Rate of reaction for the volume of reacting fluid

A

Ri= 1/v x dn/dt

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12
Q

Ror of mass of solid in fluid solid system

A

Ri’=1/w x dn/dt

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13
Q

Ror of the volume of solid in solid gas system

A

Ri’’=1/s x dv/dt

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14
Q

Ror of solid in gas-solid system

A

Ri’’’=1/v x dn/dt

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15
Q

Ror of volume of reaction, if different from the rate based on volume of fluid

A

Ri’’’’=1/vr x dn/dt

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16
Q

What is rA

A

Rate of formation

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17
Q

What is -rA

A

Rate of dissapearence

18
Q

What is the stoichiometric equation of aA+bB—>rR+sS

A

-rA/a=-rB/b=rR/r=rS/s

19
Q

Definition of reaction law rate

A

Algebraic equation for reaction rate as a function of properties of the reaction materials and conditions

20
Q

What is elementary reaction

A

Reaction with no intermediate, single step

21
Q

Units for 0 order

A

Mol L-1 s-1

22
Q

Unit for 1st order

A

S-1

23
Q

unites for 2nd order

A

Mol-1 L s-1

24
Q

What is the rate reaction for gas phase reaction, including simplified version (show how it is derived)

A

Pv=nRT, C=n/v
So, p=CRT, C=p/RT

-rA=kCnA
-rA=k(pA/RT)n

Where k’=k/(RT)n

So, -rA=k’Pna

25
Q

Ahrenius equation

A

K=k0e^-e/RT

26
Q

Ahrenius equation interms of y=mx+c

A

LnK=lnK0-(E/R)1/T

27
Q

Interms of what is the conversion of reactant used in batch process

A

Moles

28
Q

Signs of
Fractional conversion
Initial amount of moles
Moles A present after certain time

A

XA
NA0
NA

29
Q

2 equation of the conversion of A in time t for batch process

A

Xa=(NA0-NA)/NA0

Xa=1-(NA/NA0)

30
Q

No of moles of A interms of NA0 and XA, equation

A

NA=NA0(1-XA)

31
Q

Fractional conversion equation when volume is constant

A

XA=1-CA/CA0

32
Q

Conversion rate in continuous process

A

XA=(FA0-FA)/FA0

33
Q

What type of system batch reactor

A

Closed system, neither inflow nether outflow

34
Q

What happens to concentration over time in batch reactor

A

Changes

35
Q

What is batch reactor usually used for

A
  1. Same volume prediction
  2. Flexibility of multi product operation
  3. Lower capital cost
  4. Lab testing
36
Q

What is continuous reactors used for

A

Long production runs and products made in large scale

37
Q

What happens to conditions in continuous process over time

A

Doesn’t change

38
Q

When is CSTR used

A

Large scale, liquid phase, intense agitation

39
Q

condition of CSTR can work

A

Up to 300 degrees and 300 bar

40
Q

What about the concentration in CSTR

A

Assume perfect mixing, C is the same everywhere in the reactor

41
Q

ADV of CSTR

A

Cheap construction cost
Good T control

42
Q

Disadvantage of CSTR

A

Mix might not be done properly
Reactants might bypass through outlet

CAPE1010 (1 decks)

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