by Jim Lane (Biofuels Digest) ... So, here’s what our intrepid team led by Jeffrey Blackburn and Wei Xiong did. Knowing that plants have two systems inside them for photosynthesis, and that the second doesn’t play well with others, the genetically engineered cyanobacteria to shut down the pathway and then snapped the re-imagined cell to the cathode end of an electro-chemical circuit. There’s quite a bit of spooky science in how they handle the system — the molecular equivalent of a lot of tab A – slot B undertakings.
Bottom line, you take excess solar or wind energy — and, you’re already thinking “Power-to-X, I know, well done you — and you make acetate or ethylene. Which is to say, when you’ve polymerized the ethylene, you’ve stored the solar energy inside glad-wrap, which the world pays good money to own. Reduced need to build expensive energy storage that you have to pay for as an expense, less risk of shedding valuable energy, and now we have an extremely low-carbon path to ethylene.
...
Also at NREL
...
This team here developed a fully integrated process to produce a promising precursor for diesel and jet fuel from cellulosic biomass, and the team estimates that their biomass-derived butyric acid can be sold at 55% of the current selling price of petroleum-derived butyric acid.
Especially good news when you see that oil has crept up over $80 a barrel, again.
The process established by NREL team is energy-efficient and results in a 50% reduction in greenhouse gas emissions compared to traditional biological production routes. Right now, they’ve moved on the scale-up, but they do have a process, that’s fine progress.
The backstory
The precursor, butyric acid, is normally derived from petroleum-derived propylene. Globally, approximately 80,000 tons are produced each year and sold at a price of about $1.80 a kilogram.
...
Only one slight complication here, does anyone really use butyric acid on a regular basis to make diesel and jet fuel? Just sayin’, no one’s ever going to use it as a precursor when it costs $1.80 a kilo, which works out to, depending on your fuel oil of choice, around $5.87 a gallon as a feedstock starting point.
It’s very good news that we can make it for 45% less using a bio-based route. Nevertheless, we’re down to $3.28, or around 40 cents per pound, which is about the price of pretty decent white grease or soybean oil.
It’s also very good news that we can make this from lignocellulosic biomass. That’s extending the range of available feedstocks, brava!
Nevertheless, we probably should be chatting about butyric acid as a chemical precursor as opposed to a fuel precursor.
Why are we even hearing about “jet fuel” and “diesel” from NREL on this, anyway?
We’ll make an educated guess that we’re seeing “jet fuel” and “diesel” in the description of the breakthrough for pretty much the same reason that you almost never had heard those words in the same sentence as butyric acid for, say, the last ten years. Which is to say, fuels are in vogue again. Not to mention, the research was funded by the US Department of Energy and conducted by the National Renewable Energy Laboratory. Hint hint. It’s become obligatory, it appears, to city “diesel and jet fuel precursor” in DOE-funded liquids research since 14 nanoseconds after President Biden set a goal of “3 billion gallons of jet fuel by 2030”.
...
In undertaking the research, the scientists evaluated microbes already able to produce butyric acid from biomass sugars. Very few have been studied for industrial applications. They considered two bacteria—Clostridium tyrobutyricum and Clostridium butyricum—that are able to ferment the two primary lignocellulosic sugars, glucose and xylose, and generate butyrate, acetate, carbon dioxide, and hydrogen as major products.
Using corn stover as the biomass, the researchers compared the performance of the two bacteria and determined C. tyrobutyricum better able to produce the precursor. Researchers further developed an advanced fermentation process wherein butyric acid is continuously extracted from the fermentation vessel. This process—termed by the authors hybrid extraction distillation – in situ product recovery (HED-ISPR) process—showed a “promising path” for converting biomass to butyric acid as a chemical intermediate for the production of renewable fuels. READ MORE
Process intensification for the biological production of the fuel precursor butyric acid from biomass (Cell Reports)
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