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AssigneesToyota Jidosha Kabushiki Kaisha, Genesis Research Institute, Inc.
InventorsKunio Arai, Tadafumi Ajiri, Hideo Hattori, Mitsuru Sasaki
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A method for forming II-type cellulose, which comprises introducing together a slurry having water and a I-type cellulose dispersed therein and water in the state of high temperature and high pressure to a tubular reactor (28) contacting the I-type cellulose with a hot water in a supercritical state or subcritical state for a predetermined time in the tubular reactor (28), to thereby cleave a part of the hydrogen bonds in the I-type cellulose and dissolve the I-type cellulose into the water in a supercritical state or subcritical state, cooling a cellulose solution discharged from the tubular reactor (28) in a cooler (30) to room temperature or lower, followed by allowing to stand, to thereby precipitate crystals of II-type cellulose having a molecular weight lower than that of the I-type cellulose, and separating the resultant II-type cellulose from a solvent. The method allows the preparation of pure II-type cellulose by the use of a simple process.
A method for forming a cellulose, comprising the steps of cleaving hydrogen bonds in a type I cellulose in a solvent of water in a supercritical state or water in a subcritical state and at a temperature of 350 to 400° C. and a pressure of 25 to 33 MPa such that the type I cellulose is dissolved in the water in a supercritical state or the water in a subcritical state, and then allowing the resulting solution to return to room temperature or lower at atmospheric pressure to obtain a type II cellulose having a lower polymerization degree than the type I cellulose.
A method for forming a type II cellulose, comprising the steps of:
A method for forming a cellulose, comprising the steps of:
Dependencies are inferred from the claim text.