Process for pyrolysis of carbohydrates
AssigneeEvonik Degussa GmbH
InventorsAlfons Karl, Jürgen Erwin Lang, Hartwig Rauleder, Bodo Frings
Life of this patent
Estimating the term…
Abstract
The present invention relates to processes for industrial pyrolysis of a carbohydrate or carbohydrate mixture with addition of amorphous carbon, to a pyrolysis product thus obtainable and to the use thereof, especially as a reducing agent in the production of silicon from silica and carbon at high temperature.
Claims21
A process for industrial pyrolysis of a carbohydrate or carbohydrate mixture, wherein the process is performed with addition of amorphous carbon.
A pyrolysis product formed from at least one carbohydrate, wherein the product has a very low ash content of less than 0.5% by weight, or a content of:
- a. aluminium less than or equal to 5 ppm,
- b. boron less than 10 ppm to 0.0001 ppt,
- c. calcium less than or equal to 2 ppm,
- d. iron less than or equal to 20 ppm;
- e. nickel less than or equal to 10 ppm,
- f. phosphorus less than 10 ppm to 0.0001 ppt,
- g. titanium less than or equal to 2 ppm,
- h. zinc less than or equal to 3 ppm.
(canceled)
A process for producing silicon, wherein
- a mixture of a carbohydrate and an amorphous carbon are pyrolysed at temperatures of 400 to 700° C., and the pyrolysis product is subsequently used to produce silicon.
A process for producing silicon, wherein
- a mixture of a carbohydrate and an amorphous carbon is introduced in unpyrolysed form into a reduction reactor, a carbon reducing agent is produced in situ therein by pyrolysis and the carbon reducing agent is subsequently reacted with silica or silicon carbide to give silicon.
Dependencies are inferred from the claim text.