Definition of a crystallization micropilot
Use of the pilot
First, we choose the type of crystallizer that we believe best suited to ensure that the crystal granulometry obtained is suited to our requirements going forward:
- - liquid-solid separation and drying;
- - ease of use for clients.
We must then ensure the merits of this choice by means of a pilot, which must be:
- - cheap, so small;
- - easily extrapolated according to clear laws;
- - fitted with pipes that do not constantly become blocked.
The pilot must allow us to study the influence of the kinetic parameters on granulometry (and crystallization yield if we proceed by cooling). These parameters are as follows:
- - residence time of the slurry in the crystallizer;
- - temperatures required by the slurry at various places in the installation;
- - slurry crystal content;
- - recirculation flow through the exchanger.
- - choice of temperature, to avoid crusting the exchanger while remaining economical;
- - sensitivity of crystals to stress imposed by pumps and agitators (mechanical fragility).
If the pilot study is performed correctly, the industrial exchanger will not become blocked and a fortiori, neither will the tubes. We will consider several principles to adhere to for a correct pipe design.