Search results for: Ursel Hornung

Items from 1 to 8 out of 8 results

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Techno‐Economic Assessment of a Microalgae Biorefinery

Bingfeng Guo, Ursel Hornung, Shicheng Zhang, Nicolaus Dahmen

Chemie Ingenieur Technik > 95 > 6 > 950 - 954

A preliminary techno‐economic assessment of a microalgae biorefinery plant is reported, with pulsed electric field treatment (PEF) hydrothermal liquefaction as core technology. The results indicate that standalone production of microalgae biofuel would lead to an annual loss of 2.615 M€. PEF treatment could improve this scenario by bringing the microalgae biofuel to a competitive level (0.78 € kg⁻¹...

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Heterogeneous catalytic upgrading of biocrude oil produced by hydrothermal liquefaction of microalgae: State of the art and own experiments

Diego López Barreiro, Blanca Ríos Gómez, Frederik Ronsse, Ursel Hornung, more

Fuel Processing Technology > 2016 > 148 > C > 117-127

This paper reviews the literature on upgrading of biocrude oil obtained by hydrothermal liquefaction of microalgae. It analyses the influence of several parameters (e.g., temperature, operation mode, reaction time, catalyst) on the yields and properties of the upgraded product. Some own experiments are performed based on the review outcomes, comparing for the first time the application of heterogeneous...

article

Hydrothermal liquefaction of microalgae: Effect on the product yields of the addition of an organic solvent to separate the aqueous phase and the biocrude oil

Diego López Barreiro, Sascha Riede, Ursel Hornung, Andrea Kruse, more

Algal Research > 2015 > 12 > C > 206-212

The microalgae species Nannochloropsis gaditana (marine) and Scenedesmus almeriensis (freshwater) were subjected to hydrothermal liquefaction (HTL) at 350°C in small microautoclaves for 15min to study the separation of the aqueous and biocrude oil products, either by gravity or assisted by an organic solvent (dichloromethane). The vast majority of the research available for microalgae HTL determines...

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Suitability of hydrothermal liquefaction as a conversion route to produce biofuels from macroalgae

Diego López Barreiro, Mario Beck, Ursel Hornung, Frederik Ronsse, more

Algal Research > 2015 > 11 > C > 234-241

The brown algae Fucus vesiculosus, Laminaria saccharina and Alaria esculenta were subjected to hydrothermal liquefaction (HTL) for 15min at 350°C in batch microautoclaves. Further optimization was carried out in view of optimizing the biocrude oil yield, varying the temperature from 330 to 370°C. The maximum conversion to biocrude was 29.4±1.1wt.% at 360°C for A. esculenta. The reaction pathways for...

article

Cultivation of microalgae with recovered nutrients after hydrothermal liquefaction

Diego López Barreiro, Manuel Bauer, Ursel Hornung, Clemens Posten, more

Algal Research > 2015 > 9 > C > 99-106

One of the main concerns regarding the development of microalgal biofuels is the tremendous demand of nutrients that they require for growing, which places a question mark with their sustainability. In this paper, cultivation trials of Nannochloropsis gaditana, Phaeodactylum tricornutum, Chlorella vulgaris and Scenedesmus almeriensis are performed by reusing nutrients recovered from the aqueous by-product...

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Assessing microalgae biorefinery routes for the production of biofuels via hydrothermal liquefaction

Diego López Barreiro, Chiara Samorì, Giuseppe Terranella, Ursel Hornung, more

Bioresource Technology > 2014 > 174 > Complete > 256-265

The interest in third generation biofuels from microalgae has been rising during the past years. Meanwhile, it seems not economically feasible to grow algae just for biofuels. Co-products with a higher value should be produced by extracting a particular algae fraction to improve the economics of an algae biorefinery. The present study aims at analyzing the influence of two main microalgae components...

article

Kinetic Modelling of Hydrothermal Lignin Depolymerisation

Daniel Forchheim, Ursel Hornung, Andrea Kruse, Tatjana Sutter

Waste and Biomass Valorization > 2014 > 5 > 6 > 985-994

Although lignin is one of the most abundant renewable organic materials in the world, it is principally a waste product of the paper industry which is used for the production of heat and power. Hydrothermal lignin depolymerisation aids in facilitating the valorization of lignin in aqueous solutions or suspensions. For the recovery of valuable phenolic products from lignin it is crucial to understand...

article

Sequential pyrolysis and catalytic low temperature reforming of wheat straw

Ursel Hornung, David Schneider, Andreas Hornung, Vander Tumiatti, more

Journal of Analytical and Applied Pyrolysis > 2009 > 85 > 1-2 > 145-150

Aim of the work is the implementation of a low temperature reforming (LT reforming) unit downstream the Haloclean pyrolyser in order to enhance the heating value of the pyrolysis gas. Outside the focus of this work was to gain a synthesis gas quality for further use. Temperatures between 400°C and 500°C were applied. A commercial pre-reforming catalyst on a nickel basis from Südchemie was chosen for...

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