Method and device for producing fullerenes

Details Method and device for producing fullerenes Method and device for producing fullerenes

1999-12-03

2002-03-19

Mayekar, Kishor (Department: 1741)

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C423S44500R, C423S449100

Reexamination Certificate

active

06358375

ABSTRACT:

The invention relates to a method and a device for the continuous production of carbon black with a high fullerene content.
In the following the term fullerenes refers to molecular, chemically homogenous and stable fullerenes. Representatives of this group of fullerenes are C
60
, C
70
or C
84
. These fullerenes are generally soluble in aromatic solvents. A particularly preferred fullerene is the C
60
fullerene.
For the production of carbon black containing fullerenes several methods are known. However, the achievable concentration of fullerenes in the obtained carbon black is so low that a preparation of pure fullerenes is only possible with great expenditures. Due to the resulting high price of pure fullerenes interesting applications in different fields of technology are for economical reasons a priori not conceivable. The U.S. Pat. No. 5,227,038 for example, discloses an apparatus for a laboratory allowing to produce a few grams of fullerenes in a discontinuous way by means of an electric arc between carbon electrodes serving as a raw material. Apart from the fact that the produced amounts are tiny, the concentration of fullerenes C
50
in the deposited carbon black is very low and never exceeds 10% of the produced mass. Further, the fullerene C
60
is in this method present in a mixture with higher fullerene compounds requiring costly fractionation for an isolation with sufficient purity.
The U.S. Pat. No. 5,304,366 describes a method allowing a certain concentration of the product but using a system for filtering a gas circulation at a high temperature which is difficult to practically perform.
The EP-B1 0 682 561 describes a general method for the production of carbon black with a nanostructure defined by the influence of a gaseous plasma on carbon at high temperatures. In product series obtained in this way fullerenes may at sufficient treatment temperatures be obtained in a continuous technical way.
However, the reaction products resulting from the method according to EP-B1 0 682 561 are very impure and contain apart from carbon which has not been transformed into fullerenes at best 10% fullerene C
60
as a mixture with higher fullerenes.
It was therefore the problem of the invention to develop a device and a method allowing to continuously produce carbon black with a high content of fullerenes.


REFERENCES:
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patent: WO 94/17908 (1994-08-01), None

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