| 摘要 |
Recovering carbon fibers from carbon fiber-containing plastics, preferably carbon fiber-reinforced plastics, preferably carbon fiber-containing- and/or carbon fiber-reinforced composite materials, comprises subjecting an article based on a plastic comprising carbon fibers, in which carbon fibers are present in a plastic matrix, to a multi-step pyrolysis for decomposing plastic of the plastic matrix to obtain carbon fibers, in presence of oxygen and in a pyrolysis device (P) comprising a heating zone (A), a first pyrolysis zone (B1), a second pyrolysis zone (B2) and a cooling zone (C). Recovering carbon fibers from carbon fiber-containing plastics, preferably carbon fiber-reinforced plastics, preferably carbon fiber-containing- and/or carbon fiber-reinforced composite materials, comprises subjecting an article based on a plastic comprising carbon fibers, in which carbon fibers are present in a plastic matrix, to a multi-step pyrolysis for decomposing plastic of the plastic matrix to obtain carbon fibers, in presence of oxygen and in a pyrolysis device (P) comprising (i) a heating zone (A) for heating the article to be treated and/or recycled to a defined temperature, (iia) a first pyrolysis zone (B1) for carrying out pyrolysis of the plastic of the plastic matrix of the article to be treated at a defined temperature and a defined oxygen content, (iib) a second pyrolysis zone (B2) for carrying out final pyrolysis of the plastic of the plastic matrix of the article to be treated, which is remaining after the treatment in the first pyrolysis zone, at a defined temperature and a defined oxygen content, until complete removal of the carbon fibers, and (iii) a cooling zone (C) for cooling the recycled carbon fibers obtained from the second pyrolysis zone. The oxygen content in the second pyrolysis zone is increased compared to the oxygen content in the first pyrolysis zone. The temperature in the second pyrolysis zone is increased compared to the temperature in the first pyrolysis zone. An independent claim is also included for recycled carbon fibers obtainable by the above method. |
