Title:
Co-Production Schemes in the Bio-SNG Process: BTX Production and Harvesting
Author(s):
Mourão Vilela, C.F., Aranda Almansa, G., Vreugdenhil, B.J., Bos, A., Kuo, Y.T.
Document(s):
Paper
Abstract:
In the thermochemical route for the production of bio-SNG there are several compounds (e.g. ethylene, BTX) that have to be removed or converted since they will have a harmful effect in downstream processes (deactivation of nickel catalysts). However, these components have a high economic value, even higher than the final product, SNG. ECN has envisioned a novel process for the recovery of these valuable compounds which consists of catalytically converting ethylene into BTX followed by the direct recovery of the BTX as a liquid product from the product gas using a scrubbing process. The present work explores the performance of an aromatization Ga-ZSM5 catalyst under different temperatures and during long periods of time (24h) and the direct recovery of BTX from the product gas. Among the temperatures studied, 500°C is the best for the optimization of BTX in the product gas with carbon selectivity up to 55%. During the 24h test at this temperature the ethylene conversion slightly decreased from 98% to 95% whereas the acetylene was fully converted. The production of BTX was stable throughout the test. The duration test at 300°C showed a fast deactivation of the catalyst probably due to coke formation. The composition of the collected bio-BTX product depends on the composition of the inlet product gas which in turn is dependent on the gasification conditions upstream (feedstock composition, temperature, bed material). Regardless of these changes the recovery of BTX occurred without problems and with high efficiencies, 98% of benzene and 100% of toluene were removed from the product gas. The main components of the product gas were not affected during the recovery.
Keywords:
catalytic conversion, allothermal gasification, synthetic natural gas (SNG), ethylene aromatization, bio-BTX
Topic:
Biomass Conversion Technologies for Fuels, Chemicals and Materials
Subtopic:
Biorefineries
Event:
26th European Biomass Conference and Exhibition
Session:
3BO.3.3
Pages:
947 - 952
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-3BO.3.3
Price:
FREE
