How food waste can turn into climate-friendly jet fuel


For many uses, Liquid fuels provide the most practical power – clear examples of aircraft and large ships. It is possible to produce biofuel for these applications. So far no one was able to send in the perfect solution, which is not strange.

In this New paperA team of researchers in the United States has therefore looked at the possibility of converting food waste into jet fuel. Chemically, the results are great, producing ingredients that can be blended somewhat with standard jet fuel to meet all regulatory standards. Economically, the situation is not so great, it only works at the price it was five years ago. But the truth is that the waste would otherwise keep methane in the atmosphere because it decides more than offset Carbon dioxide Produced by jet fuel in the mixture. Thus a price equation of carbon can change.

The work here has been termed “wet waste” which includes things like food waste, animal manure and sewage. As you might expect, we produce a lot of this stuff, the authors estimate that its total power is equivalent to about 10 billion gallons of jet fuel per year. Due to the amount of water present, it is very powerful to convert this waste directly into any type of fuel, since water has to be discarded, but it is possible to place the waste in an oxygen-free environment and convert it to bacteria. Methane.

What the authors are focusing on is hindering the process. If you grow bacteria under the right conditions, they will not completely break down chronic, complex fats. Instead, they will stop at a point where these cells have a large amount of carbon in the form of relatively short molecules that are four to eight carbons long. They usually contain two oxygen at one end of the carbon chain, causing them to form weak acids.

Chemically, it is possible for these molecules to react in such a way that two of the weak acids merge into a single molecule, leaving a single molecule of water and carbon dioxide in the process. The resulting molecule is now twice the length (two four-carbon molecules to form a seven-carbon molecule and the other carbon to express CO)D). And it brings the length closer to the common hydrocarbons in jet fuel.

The longer molecule still has oxygen attached to it and there are two ways to get rid of it. A common reaction, including a hydrogen and a cheap catalyst, removes oxygen in the form of water. One alternative is to combine more weakly acid molecules, creating more complex branched structures. (This process also requires a reaction with hydrogen to convert the substance into pure hydrocarbons) Jet fuel.

So the researchers now had a process. Feed the waste in a bacterial digestion, prevent the bacteria from producing methane, and separate low fatty acids from digestion. Then, go through a few reactions and mix a hydrocarbon that can be used as fuel.

Of course, there are several fairly specific requirements for the formation of jet fuel designed by airlines to ensure the safety of aircraft and on-ground operations. And some of the fuels produced by these two processes differ from standard jet fuels in some mesh methods such as flash point and freezing, which determine the behavior of the fuel in response to high and low temperatures, respectively.

This would have been no problem if these biofuels had been kept below 10 percent of the total jet fuel mixture. But if you want to create a blend that is basically biofuels. However, two different reactions produced products that differed in opposite ways (one produces higher flashpoint liquids, the other lower-flashpoint liquids). So by mixing the two together, it was possible to create a jet fuel mixture that was more than 70 percent biofuel.



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