Pretreatment of cellulosic material with carbon dioxide

Details Pretreatment of cellulosic material with carbon dioxide Pretreatment of cellulosic material with carbon dioxide

1988-08-04

1991-02-26

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

127 37, 162 50, D21C 100, D21C 104

Patent

active

049959433

ABSTRACT:
Pretreatment of cellulosic material with carbon dioxide gas, preparatory to being converted chemically, as by hydrolysis, etc. Biomass material, such as branches, stalks, brush, or foliage, or cellulosic products, such as waste paper or cardboard, is reduced to finely divided dry form and is exposed to carbon dioxide in an anhydrous environment, is compressed to superatmospheric pressure and then is decompressed to subatmospheric pressure, expelling air and other gases, particulates, water, other volatiles, etc. Then the cellulosic material is returned to atmospheric pressure, and subsequently is either recycled through such compression and decompression and return, or is compressed to even high pressure. Such environment is enriched in carbon dioxide, such as comprising it in substantial or major part or consisting essentially thereof.

REFERENCES:
patent: 1790260 (1931-01-01), Cable
patent: 3558428 (1971-01-01), Asplund
patent: 3711366 (1973-01-01), Nakano
patent: 3726756 (1973-04-01), Polak
Rydholm; "Pulping Processes"; Interscience Publishers, N.Y., Sep. 1967, pp. 294-305.
Casey; Pulp & Paper, 2nd Ed., vol. I; Interscience Publishers, Inc.; N.Y., 1960, pp. 1372-1375.

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