# Rate law and type of reactor

1. Sep 15, 2014

### Maylis

Hello,

I noticed, when deriving rate laws, the assumption is that the reaction is happening in a batch reactor. Does the rate law of a chemical reaction change if put into some type of flow reactor?

Thanks

2. Sep 20, 2014

### Staff: Mentor

What specifically are you referring to (mathematically) when you use the term "rate law?"

3. Sep 21, 2014

### Maylis

Something like this

$r_{A} = -kC_{A}^{\alpha}C_{B}^{\beta}$

4. Sep 21, 2014

### Staff: Mentor

Yes. This applies to all reactors, both flow and batch. But often, in the laboratory, the parameters in the rate expression are measured in a batch reactor (since it's easier to set up).

Incidentally, the reaction rate is usually expressed without the minus sign, so the rate represents the rate of disappearance of A and B.

Chet

Last edited: Sep 21, 2014