Select your localized edition:

Close ×

More Ways to Connect

Discover one of our 28 local entrepreneurial communities »

Be the first to know as we launch in new countries and markets around the globe.

Interested in bringing MIT Technology Review to your local market?

MIT Technology ReviewMIT Technology Review - logo

 

Unsupported browser: Your browser does not meet modern web standards. See how it scores »

Renmatix, a startup based in Kennesaw, Georgia, is using water at high pressure and temperature to transform wood chips into sugar, which can then be fermented to make biofuels and other chemicals. The company says the process can produce sugar for the same price as making it from sugarcane, which has led to profitable biofuels production in Brazil.

Renmatix is addressing the most difficult step in producing ethanol from abundant cellulosic materials such as wood chips, instead of from corn or sugar crops. Once the sugar is made, the same technology employed in a conventional corn or sugarcane ethanol plant can be used to produce ethanol.

So far, Renmatix has only demonstrated the technology on a small scale, using a facility that can process three tons of wood chips a day. As with all advanced biofuels companies, one of the biggest challenges will be convincing investors to hand over the money needed to build a larger commercial facility to prove the venture is commercially viable. The U.S. Environmental Protection Agency has been forced to waive requirements for cellulosic ethanol because commercial plants for converting cellulosic material to ethanol haven’t yet been built. By lowering the cost of producing sugar from cellulosic materials, Renmatix hopes to at last break this logjam.

Researchers and companies have tried many methods of turning cellulose into sugar. Some involve breaking the biomass down using acids or specially tailored enzymes. Others involve using heat and pressure to turn biomass into hydrogen and carbon monoxide, which can be converted to biofuel using inorganic catalysts. Each method has drawbacks: enzymes are expensive; acids are toxic. Both processes are slow, and they require expensive equipment. The processes that use high heat and inorganic catalysts also have relatively low yields of the desired fuels.

Instead of using enzymes or acids, Renmatix employs supercritical water—water at very high temperatures and pressures. Under these conditions, cellulose will dissolve and very quickly break down into sugar molecules. The reactions take seconds, compared to days for some other processes. Because of the high speed of the reaction, a relatively small amount of equipment can produce a large amount of sugar, keeping capital costs down. Smaller equipment could also make it possible to distribute the production of biofuels, thereby decreasing the cost of transporting biomass.

2 comments. Share your thoughts »

Credits: Renmatix

Tagged: Energy, biofuel, wood chips, sugarcane

Reprints and Permissions | Send feedback to the editor

From the Archives

Close

Introducing MIT Technology Review Insider.

Already a Magazine subscriber?

You're automatically an Insider. It's easy to activate or upgrade your account.

Activate Your Account

Become an Insider

It's the new way to subscribe. Get even more of the tech news, research, and discoveries you crave.

Sign Up

Learn More

Find out why MIT Technology Review Insider is for you and explore your options.

Show Me