METHOD OF PRODUCTION OF THE HIGH-STRUCTURED CARBON-SILICA COMPOSITES PRODUCED OUT OF THE BIOMASS Russian patent published in 2007 - IPC C01B33/12 C01B31/00 

FIELD: chemical industry; methods of production of the carbon-silica absorbents.

SUBSTANCE: the invention is pertaining to production of the carbon-silica absorbents - the high-carbonized amorphous silicon dioxide in particular, to production of the high-ash lignocellulose raw. Grind the source biomass up to the sizes of 2-5 mm and exercise carbonization either by the pyrolysis in the inert medium or in the reducing medium at the temperature of 300-650°С within 0.5-5 hours, or by gasification (partial oxidizing) in the fluidized layer of the catalyst or the inert carrier at the temperature of 400-800°С with the duration of the contact of 0.1-60 seconds and α=0.8-3.0 (α is the ratio of О₂ of the air to carbon). After carbonization the material is fused at the temperature of 750-1000°С with the sodium carbonate or with the potassium carbonate or with the sodium hydroxide in the inert medium. The produced alloy at the temperature of 30-60°С is solved in the minimum water volume (the mass ratio of the water/alloy = 3-4). To the produced solution add the solution of the inorganic acid with the concentration of 1-7 mole/l, or the carbon-dioxide gas. The settled gel is aged within 10-100 hours. After washing the gel SiO₂ with the containing in it carbonic particles, the produced material is dried at the temperature of up to 100°С and incinerated at 130-200°С. The carbon-silica composites produced by the tendered method have the more structural morphology, the high values of the specific surface, the ash content in the more broad range and the homogeneous distribution of the phases.

EFFECT: the invention ensures production of the carbon-silica composites having the more structural morphology, the high values of the specific surface, the ash content in the more broad range and the homogeneous distribution of the phases.

5 cl, 2 dwg, 10 ex