Carbon microparticle having lignin as raw material and preparation method therefor
US9321649B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2012 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | Jun 9, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preparing a carbon microparticle from an organic raw material having lignin as a main constituent, wherein an aqueous solution with 5% total concentration of lignin and sodium hydroxide (the proportion in mass is 1:0.5) is spray-dried to prepare a complex microparticle. This complex microparticle is heat-processed under nitrogen atmosphere at 600° C. for one hour and cooled. Thereafter, this is washed with water and further dried to prepare a hollow carbon microparticle such as those shown in FIG. 2 (b). The prepared carbon microparticle is light-weight and has an equivalent specific surface area to commercially available activated charcoal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.