[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]
UC Davis process produces gasoline-range hydrocarbons from biomass-derived levulinic acid; field-to-tank yield of >60% claimed
February 04, 2014
|GC-MS chromatogram of the liquid products obtained after hydrodeoxygenation of angelica lactone dimer. Source: Mascal et al. SI. Click to enlarge.|
Researchers at the University of California, Davis have developed a process for the production of branched C7–C10 hydrocarbons in the gasoline volatility range from biomass-derived levulinic acid with good yield, operating under relatively mild conditions, with short reaction times.
Considering that levulinic acid is available with more than 80% conversion from raw biomass, a field-to-tank yield of drop-in, cellulosic gasoline of more than 60% is possible, the researchers claimed. A paper on their work is published in the journal Angewandte Chemie International Edition; UC Davis has filed provisional patents on the process, and is making it available for licensing.
KiOR expects to produce 920K gallons of cellulosic biofuels by year end; short-term focus on economics
December 24, 2013
Cellulosic gasoline and diesel company KiOR, Inc. expects that, given current and anticipated operations through the remainder of the year, its Columbus, Mississippi facility will produce approximately 410,000 gallons of renewable fuel during the fourth quarter of 2013, bringing full year production total from the facility to approximately 920,000 gallons. (Earlier post.) The ratio between gasoline, diesel and fuel oil expected to be produced during the year is approximately 35% gasoline, 40% diesel, and 25% fuel oil.
In August, the US Environmental Protection Agency (EPA) finalized the 2013 percentage standards for four fuel categories that are part of the Renewable Fuel Standard (RFS) program. With the final 2013 overall volumes and standards requiring 16.55 billion gallons of renewable fuels to be blended into the US fuel supply (a 9.74% blend), EPA projected 6 million gallons (0.004%) of cellulosic biofuels. Of that, EPA projected the bulk to come from the KiOR Columbus plant (5-6 million gallons of renewable gasoline and diesel).
Converting glycerol from biodiesel production into bio-gasoline
December 16, 2013
A team at the University of Idaho has demonstrated that glycerol, a byproduct from biodiesel production, could be used as a substrate for producing drop-in gasoline-range biofuel. In a paper published in the ACS journal Energy & Fuels, Guanqun Luo and Armando G. McDonald describe their study of converting methanol (MTG) and a mixture of methanol and glycerol (MGTG) into gasoline-range hydrocarbons using a bench-top, fixed-bed microreactor.
The MTG- and MGTG-generated liquids showed a similar composition, mainly methylbenzenes, to regular gasoline, and composition changed as the reaction proceeded to favor heavier aromatics.
KIT’s fast biomass pyrolysis to liquids bioliq plant produces first gasoline
September 30, 2013
|The multi-stage bioliq process produces high-quality synthetic fuels from straw and other biogenous residues. Graphic: N. Dahmen, KIT/IKFT. Click to enlarge.|
The synthesis stage of Karlsruhe Institute of Technology’s (KIT’s) multi-stage bioliq pilot plant has begun operation and has produced biogasoline. All stages of the bioliq process—flash pyrolysis, high-pressure entrained-flow gasification, and now synthesis—have now been realized and the project will now be completed by testing the entire process chain and optimizing it for the large industrial scale.
As soon as all stages of the bioliq process will have been linked, the pilot plant will supply high-quality fuel from straw, probably in mid-2014. The complete bioliq process (Biomass to Liquid Karlsruhe) comprises four stages (earlier post):
KAIST team engineers novel pathway for direct production of biogasoline by E. coli bacteria
A team at the Korea Advanced Institute of Science and Technology (KAIST) has developed a a novel strategy for microbial gasoline production through the metabolic engineering of Escherichia coli. The team engineered engineered platform E. coli strains that are capable of producing short-chain alkanes (SCAs; i.e., gasoline); free fatty acids (FFAs); fatty esters; and fatty alcohols via the fatty acyl (acyl carrier protein (ACP)) to fatty acid to fatty acyl-CoA pathway.
As reported in their paper in Nature, the final engineered strain produced up to 580.8 mg per liter of SCAs consisting of nonane (327.8 mg l−1), dodecane (136.5 mg l−1), tridecane (64.8 mg l−1), 2-methyl-dodecane (42.8 mg l−1) and tetradecane (8.9 mg l−1), together with small amounts of other hydrocarbons.
New route for upgrading bio-oil to biogasoline via molecular distillation and catalytic cracking
September 18, 2013
|Bio-oil-graded upgrading route based on molecular distillation and catalytic cracking. Credit: ACS, Wang et al. Click to enlarge.|
A team at Zhejiang University, China, has developed a novel cracking technology for the upgrading of bio-oil, produced by the fast pyrolysis of biomass, to biogasoline. In a paper published in the ACS journal Energy & Fuels, they report that the co-cracking of the distilled fraction (DF) from bio-oil molecular distillation and ethanol produced a well-defined gasoline phase, and that both increasing the reaction temperature and adopting pressurized cracking benefited the yield and quality of this gasoline phase.
Under optimum reaction temperature and pressure, co-cracking of the DF and ethanol, with different weight ratios, all generated high-quality gasoline phases. Under 400 °C and 2 MPa, co-cracking of DF and ethanol with a weight ratio of 2:3 produced a high gasoline phase yield of 25.9 wt %; the hydrocarbon content in this gasoline phase was 98.3%. CO2, CO, and C3H8 (propane) were the main gaseous products, and a low coke yield of 3.2 wt % was achieved.
DARPA awards WUSTL researcher $860,000 to engineer E. coli to produce gasoline-range molecules
September 13, 2013
The Defense Advanced Research Project Agency (DARPA) of the US Department of Defense has awarded Dr. Fuzhong Zhang, assistant professor of energy, environmental & chemical engineering at Washington University in St. Louis (WUSTL) a Young Faculty Award worth $860,000 to engineer the bacterium Escherichia coli to produce gasoline-range molecules.
Zhang’s award funds up to three years of research on his plan to engineer bacteria to produce non-natural fatty acids, which can be converted to advanced biofuels and chemicals. Zhang will engineer the fatty acid pathway to make a molecule with a chemical structure similar to isooctane—a major component in gasoline.
Joule expands solar CO2 conversion platform to produce renewable gasoline and jet hydrocarbons
April 15, 2013
Joule, the developer of a direct, single-step, continuous process for the production of solar hydrocarbon fuels (earlier post), has extended its solar CO2 conversion platform to produce renewable gasoline- and jet fuel-range hydrocarbons.
Joule has engineered photosynthetic biocatalysts that convert waste CO2 into hydrocarbons through a patented, continuous process. Joule has been successfully scaling its process for making ethanol (Sunflow-E) while also developing long-chain hydrocarbons for diesel (Sunflow-D). With this latest development, Joule can now also directly produce medium-chain hydrocarbons which are substantial components of gasoline (Sunflow-G) and jet fuel (Sunflow-J).
Task 39 report finds significant advances in advanced biofuels technologies; hydrotreating accounting for about 2.4% of global biofuels production
April 06, 2013
|Capacities of the demonstration and commercial facilities sorted by technology. Source: “Status of Advanced Biofuels Demonstration Facilities in 2012”. Click to enlarge.|
Advanced biofuels technologies have developed significantly over the past several years, according to a status report on demonstration facilities prepared for IEA Bioenergy Task 39—a group of international experts working on commercializing sustainable biofuels used for transportation that is part of the International Energy Agency’s (IEA) implementation agreement for bioenergy, IEA Bioenergy.
Hydrotreatment—as exemplified by Neste Oil’s NExBTL—has been commercialized and currently accounts for approximately 2.4% of biofuels production worldwide (2,190,000 t/y), according to the report. Fermentation of lignocellulosic raw material to ethanol has also seen a strong development and several large scale facilities are just coming online in Europe and North America. The production capacity for biofuels from lignocellulosic feedstock has tripled since 2010 and currently accounts for some 140,000 tons per year.
Navigant forecasts global 6% CAGR for biofuels to 2023
March 29, 2013
|Total Biofuels production by fuel type, world markets: 2013-2023. Source: Navigant. Click to enlarge.|
Navigant Research forecasts global biofuels production will grow at a compound annual growth rate (CAGR) of 6% between 2013 and 2023, despite slower than expected development of advanced biofuels pathways (such as cellulosic biofuels); an expected expansion in unconventional oil production in key markets such as the United States; and a decline in global investment for biofuels in recent years.
In contrast, Navigant expects the CAGR for fossil-based gasoline, diesel, and jet fuel to be 3.1% over the forecast period. The research firm projects that total biofuels production will reach 62 billion gallons by 2023 or 5.9% of global transportation fuel production from fossil sources.
Primus Green Energy to support gas-to-liquids research at Princeton University; comparing STG+ to other GTL platforms
March 28, 2013
|Schematic diagram of the Primus STG+ process. Click to enlarge.|
Primus Green Energy Inc., developer of a proprietary process to produce gasoline and other fuels from biomass and/or natural gas (earlier post), will provide financial support to engineers at Princeton University for general research on synthetic fuels, which will include assessments of various gas-to-liquids (GTL) technologies—including Primus’ own STG+—for sustainability and economic viability.
STG+ technology converts syngas into drop-in high-octane gasoline and jet fuel with a conversion efficiency of ~35% by mass of syngas into liquid transportation fuels (the highest documented conversion efficiency in the industry) or greater than 70% by mass of natural gas. The fuels produced from the Primus STG+ technology are very low in sulfur and benzene compared to fuels produced from petroleum, and they can be used directly in vehicle engines as a component of standard fuel formulas and transported via the existing fuel delivery infrastructure.