Jan Withag


Room: Horst N215

Phone: +31 53 489 2417

Fax: +31 53 489 3663

E-mail: j.a.m.withag@utwente.nl

Research topic:

Supercritical water gasification (SCWG) is a thermochemical conversion route for wet biomass/waste streams (70-95 wt.% water) into medium calorific gas, rich in either hydrogen or methane but also containing carbon monoxide and carbon dioxide. At temperatures above the critical point of water (Tc = 373.95˚C, Pc = 220.64 bar) there is no distinction between gas and liquid phase. The properties of supercritical water differ from liquid water or steam; for example a reduced dielectric constant causes that supercritical water behaves like an organic solvent. Furthermore supercritical water has excellent transport characteristics due to its low density and high diffusibility. Anticipated applications of biomass gasification in supercritical water are for example:

· The on-site production of hydrogen in industry, vehicles, buildings.

· The production of renewable hydrogen as a clean fossil fuel.

· The production of a methane rich gas.

SCWG is a new technology in the early stages of technical development. A better understanding of the fundamental phenomena is essential for an adequate SCWG reactor- and process design. In order to maximize conversion and optimize the gas conditions, research on reaction pathways and reaction mechanisms are of great importance.

Curriculum Vitae


PhD student at the Laboratory of Thermal Engineering at the University of Twente


Msc., Mechanical Engineering at the University of Twente

Thesis: Noise Prediction for an oscillating lean premixed CH4/air flame.

1999 – 2001

Industrial Engineering & Management at the University of Twente

Propedeuse (2000),
Switched to Mechanical Engineering in September 2001.