Process for hydrolyzing cellulose-containing material with gaseo

Details Process for hydrolyzing cellulose-containing material with gaseo Process for hydrolyzing cellulose-containing material with gaseo

1985-03-12

1986-05-20

Alvo, Steve

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

162 14, 162 63, C13K 102

Patent

active

045899240

ABSTRACT:
The semi-continuous process according to the invention for hydrolyzing cellulose-containing material (substrate) with gaseous hydrogen fluoride comprises sorption and subsequent desorption of HF in a total of n steps. The substrate is divided into n batches in n reactors (1a, 1b, 1c, . . . ); each batch passes through the n process steps in one reactor (1a, . . . ). Initially, sorption is carried out in the first to the (n/2)th step by the action of HF-inert gas mixtures, having an HF concentration which increases from sorption step to sorption step, at a temperature above the boiling point of HF. Subsequently, desorption is brought about in the ((n/2)+1)th to nth step by treating with heated HF-inert gas mixtures having an HF concentration which decreases from desorption step to desorption step; n is an even number from 4 to 12 and the n steps each take place in the same time segments (periods). The sequence of steps is displaced by one period from each batch to the next batch. During each period, the batch in the first step is connected to the batch in the last step and the batch in the second step with the batch in the penultimate step and the batch in the (n/2)th step with the batch in the ((n/2)+1)th step, by HF-inert gas circulations.

REFERENCES:
patent: 3481827 (1969-12-01), Brooks
patent: 3619350 (1969-07-01), Marchfelder
patent: 3919041 (1975-11-01), Wilder
Seike et al., Industrial and Engineering Chem. Prod. Res. Dev., 21:11-16 (1982).
Chemical Abstracts, 96:202455v (1982).
Hardt et al., in Biotechnology and Bioengineering, John Wiley & Sons, N.Y., 1982, pp. 903-918.
Fredenhugen et al., "Breakdown of Cellulose by Hydrogen Fluoride . . . ", Angewardte Chemie, Feb. 1933, vol. 46, 7, pp. 113-124.
Kirk-Othmer Encyclopedia of Chemical Technology, 2nd Ed., vol. 22, Wiley-Interscience, 1970, pp. 383-384; 3rd Ed., vol. 4, 1978, p. 547; vol. 11, 1980, pp. 348-349, 362, 363.
The Condensed Chemical Dictionary, 6th Ed., Reinhold, N.Y. 1961, p. 590.
Concise Chemical & Technical Dictionary, Chem. Pub. Co., 1974, p. 558.

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