Method for water-efficient production of graphite from paper
US11981572B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2023 |
| Grant date | May 14, 2024 |
| Priority date | — |
| Expiry date | Oct 26, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B32/205
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for water-efficient production of graphite of low density from paper includes steeping paper in a vessel in dimethyl sulfoxide to generate paper fibers, admixing polyacrylonitrile to the dissolved the paper fibers with stirring until formation of a paste or a mixture with pastelike consistency, introducing the paste into a mold and subsequently forcing excess liquid from the paste by pressing, to form a presscake, immersing the presscake subsequently in water for curing the polyacrylonitrile for a specified time, until polymerization of the polyacrylonitrile and formation of a cured presscake, initially drying the cured presscake in air at relatively high temperature up to 100° C., heating up the cured presscake for stabilization in air up to 250° C. to remove the residual moisture, and carbonizing the cured and dried presscake in an oven at >1000° C. and then graphitizing it at >2000° C. to give a low-density graphite block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.