The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 1985
Filed:
Feb. 28, 1985
Rudiger Erckel, Eppstein, DE;
Raimund Franz, Kelkheim, DE;
Rolf Woernle, Bad Soden am Taunus, DE;
Theodor Riehm, Heidelberg, DE;
Hoechst Aktiengesellschaft, , DE;
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.