Normally, a Pyrolysis apparatus includes an exit point for the produced gases, and this is the point where the collecting tool or the analytical tool takes the gases from.

The simplest method to collect the water produced at different temperature points from the pyrolysis of coal or biomass is to prepare multiple water collecting devices and to decide what temperature intervals or temperature points you want to analyze. When the temperature of the Pyrolyzer reaches each wanted temperature (according to the temperature display of the Pyrolyzer), you connect a new water collecting device.

Thanks for your answer, Roberto.

Could you recommend several water collecting devices for me ?

The collected water is for further analysis. Hence, the  purer the better.

Thank you very much!

This article may help you.

http://pubs.acs.org/doi/abs/10.1021/ef00010a004?journalCode=enfuem

The simplest water collecting device from a hot gaseous stream is a Liebig Condenser, from which water can be collected in a clean test tube for further measurements and analyses.

Many types of condenser exist. See for example https://en.wikipedia.org/wiki/Condenser_(laboratory) .

Thank you, Roberto and Md. Rafsan Nahian

We used a specially designed 3 staged multistage hydrocyclone to separate large exhaust from the biomass pyrolyser. No condensates should escaped until we see clear exhaust meaning only pure gases escape. Oils are heaviest and extracted first and finally water vapour ladt being lightest. Thank you. Good luck.

Furthermore the hydrocyclone was jacketed with cooling water which we adjusted the rate and tempetatures of for all 3 stages of the hydrocyclone so that no colored exhaust are observed at exit points. Emulsion must be identified and handled into a decanter. Again thanks for asking.