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

1985-02-28

1985-12-03

Alvo, Steve

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

162 14, 162 63, C13K 102

Patent

active

045564310

ABSTRACT:
A continuous process for hydrolyzing cellulose-containing material (substrate) with gaseous hydrogen fluoride, HF is sorbed by the substrate at a temperature above its boiling point in n sorption steps and thereafter the sorbed HF is removed from the substrate by heating in n desorption steps. The number n of sorption steps and of desorption steps is identical and the reaction steps mentioned each occur in reactors which are separated from one another in a gas-tight manner. After introduction into the first sorption reactor (1a), the substrate passes consecutively through gas-tight valves into the second (1a) . . . nth sorption reactor and from the latter, optionally via a hold-up reactor (2) into the first, second, . . . nth desorption reactor (3a) and is removed from the nth desorption reactor (3a). The streams of HF gas, which contain an inert carrier gas in addition to HF, are circulated between the first (1a) or second (1b) or . . . (n-1)th or nth sorption reactor and the nth (3a) or (n-1)th (3b) . . . or second or first desorption reactor respectively.

REFERENCES:
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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.
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The Condensed Chemical Dictionary, 6th Ed., Reinhold, N.Y., 1961, p. 590.
Concise Chemical & Technical Dictionary, Chem. Pub. Co., 1974, p. 558.
Fredenhagen et al., "Breakdown of Cellulose by Hydrogen Fluoride . . . ", Angewandte Chemie, Feb. 1933, vol. 46, 7, pp. 113-124.

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