Posted on 02/08/2024 11:11:15 AM PST by Red Badger
A breakthrough moment for sustainable aviation fuel / Depositphotos
A simple, cheap pretreatment promises to radically cut the price of sustainable aviation fuel (SAF) made from waste wood biomass – potentially making it cost-competitive with fossil-based jet fuel, while cutting down emissions by up to 80%.
SAF isn't a perfect green solution to aviation – indeed, no perfect solution exists at this point. Running SAF instead of jet fuel still produces carbon dioxide – but it's a higher-purity fuel, producing up to 3% more energy while burning cleaner, with heavily reduced sulfur and particulate emissions. It eliminates the entire emissions cost of the oil extraction and refining processes, and depending on the feedstock you use, you can even get it to be net carbon negative – all without modifying your jet engines.
It's distinct from biofuel, in that second-generation SAF doesn't use corn, sugar cane, soy or other food crops. That's a heinous waste of land and water. Instead, feedstocks like wood residues from milling operations, sugarcane bagasse, corn stover and other cheap, abundant waste products are used.
The problem, according to UC Riverside researchers, has been lignin, a key structural component in plant cells. Tough and resilient, lignin gives trees their strength – and also makes it hard to extract carbon for fuel from biomass, particularly when you're dealing with the harder woods. Indeed, many operations choose to just burn the lignin for process heat and power, a process which makes economic sense, but looks absolutely bananas from an environmental perspective.
(Excerpt) Read more at newatlas.com ...
https://news.ucr.edu/articles/2024/02/07/inexpensive-carbon-neutral-biofuels-are-finally-possible
Inexpensive, carbon-neutral biofuels are finally possible...From solvent to solvency
JULES BERNSTEIN February 7, 2024
When it comes to making fuel from plants, the first step has always been the hardest — breaking down the plant matter. A new study finds that introducing a simple, renewable chemical to the pretreatment step can finally make next-generation biofuel production both cost-effective and carbon neutral.
For biofuels to compete with petroleum, biorefinery operations must be designed to better utilize lignin.
Lignin is one of the main components of plant cell walls. It provides plants with greater structural integrity and resiliency from microbial attacks. However, these natural properties of lignin also make it difficult to extract and utilize from the plant matter, also known as biomass.
“Lignin utilization is the gateway to making what you want out of biomass in the most economical and environmentally friendly way possible,” said UC Riverside Associate Research Professor Charles Cai. “Designing a process that can better utilize both the lignin and sugars found in biomass is one of the most exciting technical challenges in this field.”
To overcome the lignin hurdle, Cai invented CELF, which stands for co-solvent enhanced lignocellulosic fractionation. It is an innovative biomass pretreatment technology.
“CELF uses tetrahydrofuran or THF to supplement water and dilute acid during biomass pretreatment. It improves overall efficiency and adds lignin extraction capabilities,” Cai said. “Best of all, THF itself can be made from biomass sugars.”
A landmark Energy & Environmental Science paper details the degree to which a CELF biorefinery offers economic and environmental benefits over both petroleum-based fuels and earlier biofuel production methods.
The paper is a collaboration between Cai’s research team at UCR, the Center for Bioenergy Innovation managed by Oak Ridge National Laboratories, and the National Renewable Energy Laboratory, with funding provided by the U.S. Department of Energy’s Office of Science. In it, the researchers consider two main variables: what kind of biomass is most ideal and what to do with the lignin once it’s been extracted.
First-generation biofuel operations use food crops like corn, soy, and sugarcane as raw materials, or feedstocks. Because these feedstocks divert land and water away from food production, using them for biofuels is not ideal.
Second-generation operations use non-edible plant biomass as feedstocks. An example of biomass feedstocks includes wood residues from milling operations, sugarcane bagasse, or corn stover, all of which are abundant low-cost byproducts of forestry and agricultural operations.
According to the Department of Energy, up to a billion tons per year of biomass could be made available for the manufacture of biofuels and bioproducts in the US alone, capable of displacing 30% of our petroleum consumption while also creating new domestic jobs.
Because a CELF biorefinery can more fully utilize plant matter than earlier second-generation methods, the researchers found that a heavier, denser feedstock like hardwood poplar is preferable over less carbon-dense corn stover for yielding greater economic and environmental benefits.
Using poplar in a CELF biorefinery, the researchers demonstrate that sustainable aviation fuel could be made at a break-even price as low as $3.15 per gallon of gasoline equivalent. The current average cost for a gallon of jet fuel in the U.S. is $5.96.
The U.S. government issues credits for biofuel production in the form of renewable identification number credits, a subsidy meant to bolster domestic biofuel production. The tier of these credits issued for second-generation biofuels, the D3 tier, is typically traded at $1 per gallon or higher. At this price per credit, the paper demonstrates that one can expect a rate of return of over 20% from the operation.
“Spending a little more for a more carbon-rich feedstock like poplar still yields more economic benefits than a cheaper feedstock like corn stover, because you can make more fuel and chemicals from it,” Cai said.
The paper also illustrates how lignin utilization can positively contribute to overall biorefinery economics while keeping the carbon footprint as low as possible. In older biorefinery models, where biomass is cooked in water and acid, the lignin is mostly unusable for more than its heating value.
“The older models would elect to burn the lignin to supplement heat and energy for these biorefineries because they could mostly only leverage the sugars in the biomass - a costly proposition that leaves a lot of value off the table,” said Cai.
In addition to better lignin utilization, the CELF biorefinery model also proposes to produce renewable chemicals. These chemicals could be used as building blocks for bioplastics and food and drink flavoring compounds. These chemicals take up some of the carbon in the plant biomass that would not get released back into the atmosphere as CO2.
“Adding THF helps reduce the energy cost of pretreatment and helps isolate lignin, so you wouldn’t have to burn it anymore. On top of that, we can make renewable chemicals that help us achieve a near-zero global warming potential,” Cai said. “I think this moves the needle from Gen 2 biofuels to Gen 2+.”
In light of the team’s recent successes, the Department of Energy’s Bioenergy Technology Office has awarded the researchers a $2 million grant to build a small-scale CELF pilot plant at UCR. Cai hopes that demonstrating the pilot plant will lead to larger-scale investment in the technology, as harnessing energy from fossil fuels adds to global warming and hurts the planet.
“I began this work more than a decade ago because I wanted to make an impact. I wanted to find a viable alternative to fossil fuels and my colleagues and I have done that,” Cai said. “Using CELF, we have shown it is possible to create cost-effective fuels from biomass and lignin and help curb our contribution of carbon emissions into the atmosphere.”
AVIATION PING!.....................
Yeah, we’ve got something that works great 👍👍👍👍 for decades.
Let’s change it. Brilliant.
WHAT could possibly go wrong?
waste wood biomass is a scam ... there’s almost no ACTUAL wood waste ... anything that can’t be made into lumber is already pulped for paper or ground up for particle and OSB ...
what REALLY happens is that entire forests are clear cut, and even if ALL the forests in the world were clear cut, there STILL wouldn’t be enough to replace fossil fuels ... and worse, clear cutting the world’s forest is a massive destruction of the biosphere and often results in permanent desertification ....
Numerous fungi breakdown lignin but don’t turn it into jet fuel.Oyster mushrooms, shiitake and a host of others.
$3.15/gal before transport, marketing and taxes is $133 per barrel, and likely does not include the cost of the facility to produce it. Crude oil is about $70 per barrel.
Another solution looking for a problem.
LIGNIN AVIATION FUEL!
Not commercially viable in necessary quantity.
“waste wood biomass is a scam ... there’s almost no ACTUAL wood waste ... anything that can’t be made into lumber is already pulped for paper or ground up for particle and OSB ...
what REALLY happens is that entire forests are clear cut, and even if ALL the forests in the world were clear cut, there STILL wouldn’t be enough to replace fossil fuels ... and worse, clear cutting the world’s forest is a massive destruction of the biosphere and often results in permanent desertification ....”
Agreed, about the only wood waste is in end user sawdust or when I don’t measure properly.
I’m not a chemist, but I don’t think one can make a hydrocarbon fuel that does NOT have carbon DIoxide as a by-product. (see headline of article) Not sure.
This will go perfectly with Bill gates6 plan to cut down a billion trees.
But.. but.... THIS would give our rulers and elites a way to “feel good” and proclaim they’re “not hurting thee environment” as they buzz around the world in their private jets..
The low-IQ and the woke will lick it up like ice cream....lol
Another solution looking for rich, stupid libs to FUND it.
There sure a lot of people spending a ton of money and time trying to find a solution for a problem that doesn’t exist. Mass Hysteria.
Chop down trees to make aviation fuel?
Why not just grow trees to consume CO2?
This is why everyone is researching the idea of using non-THC hemp to make sustainable aviation fuel. Given that hemp grows in many environments that couldn’t sustain other types of plant life and grows really fast, they could become a major feedstock for SAF.
“Another solution looking for rich, stupid libs to FUND it.”
Are you talkin’ about me? Because it’ll you and me that fund this nonsense. Don’t know about you Friend, but I’m neither a lib nor rich and stupid.
is there some reason this process will not work in countries
with low labor cost?
How many stupid things can they think of?
How big is infinity?.......................
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