Process for hydrolyzing cellulose-containing material with gaseous hydrogen fluoride

US4556431A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Rudiger Erckel · Eppstein, DE
• Raimund Franz · Kelkheim, DE
• Rolf Woernle · Bad Soden am Taunus, DE
• Theodor Riehm · Heidelberg, DE

Key dates

• Filing date: Feb 28, 1985
• Grant date: Dec 3, 1985
• Expiry date: Feb 28, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C13K1/02
• WIPO field: Food chemistry
• WIPO sector: Chemistry

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.