National Institute of Advanced Industrial Science and Technology

Yoshio Adachi

Keiko Nishikubo

Masaya Kodama

Tsuyoshi Sakaki

Katsumi Kamegawa

Kinya Sakanishi

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&#xb0; 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.(). The prepared carbon microparticle is light-weight and has an equivalent specific surface area to commercially available activated charcoal.

Carbon microparticle having lignin as raw material and preparation method therefor

Elastic and ultra-lightweight hollow carbon fine particles and a method for producing such hollow carbon fine particles are to be provided. In the method, fine droplets are formed from a mixed solution containing a water soluble organic substance and lithium carbonate; composite fine particles of the water soluble organic substance and the lithium carbonate are prepared by drying the fine droplets formed from the mixed solution; and the composite fine particles are decomposed at a temperature in a range of 500&#xb0; C. to 900&#xb0; C.

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Tosu, Japan

Yoshio Adachi