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Sugar, not oil

Sugar, not oil
2014-03-25
(Press-News.org) Plastic, gasoline, rubber – very many items we use every day are based on oil. But this raw material is becoming increasingly scarcer. Step by step researchers are therefore investigating possibilities for using renewable raw materials to replace oil. One well-known example of this is biodiesel, which comes not from oil sources, but from fields of yellow-flowering rape. In future it is planned to produce another substance from plants, namely isobutene, a basic chemical used in the chemical industry to produce fuels, solvents, elastomers or even antiknock agents in fuel. Sugar, not oil, will be used to produce this isobutene. Researchers at the Fraunhofer Center for Chemical-Biotechnological Processes CBP in Leuna are planning to set up a pilot plant.

Valuable product of "digestion"

The basis of this was provided by staff at the company Global Bioenergies: They introduced the unique metabolic conversion of sugar to isobutene into a microorganism: If sugar is added to this microorganism, it "digests" it – and out comes gaseous isobutene. To develop and construct this pilot plant, Global Energies will receive 5.7 million euros from the German Federal Ministry of Education and Research BMBF. The company got the CBP on board as a partner. "We have the expertise for both the biotechnological and the chemical processes, and we meet all the requirements for successfully getting the project off the ground" said a very pleased Gerd Unkelbach, Director of CBP. "For example, we are able to handle isobutene: when mixed with air explosive mixtures are formed".

Construction of the 600 m2 pilot plant will start in the CBP technical center as of the fall of 2014 and it is planned that it will come into operation a year later. The large-scale processes will take place like in the laboratory: Sugar and the microorganism go into a fermenter which converts the sugar to gaseous isobutene. The isobutene is separated, purified, liquefied and filled into containers. Once the process has been transferred from the laboratory to the pilot scale, the plant will produce up to 100 tons of isobutene per year.

Sugar from wood

Sugar as a raw material has a big advantage over oil: It grows back. However, as a result of this, isobutene production is in competition with the food industry, as the sugar that ends up in the pilot plant is lost as a foodstuff. For this reason the researchers want to change tack in future, away from sugar from sugar beet to sugar from renewable raw materials that are not suitable as foods. Wood for example.

"The sugar we use is thus totally independent of food production" explained Unkelbach. The technological basis of this is already available at the CPB in the lignocellulose biorefinery. Here the researchers break wood down into its individual components: Cellulose, i.e. sugar, hemicelluloses and lignin.

INFORMATION: Researchers will present these new activities at the Industrial GreenTec as part of the Hannover Trade Fair from 7 to 11 April in Hannover (Hall 6, Booth J18).

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Sugar, not oil

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[Press-News.org] Sugar, not oil