HYDROLYSIS OF MATERIAL CONTAINING PENTOSE AND PROCEDURE IN PRODUCING FURFURAL

摘要

: This invention is concerned with a method for continuous hydrolysis of a vegetable solid pentosan containing material in a temperature range between 80.degree. and 120.degree.C, and at a pH lower; than 5, with extraction of a usable hydrolysis residue by feed-in of raw material at one end and feed-out at the other end of a hydrolysis vessel. According to the invention, parts of the hydrolysis fluid are recirculated into the hydrolysis vessel at two different concentrations at different or identical level, and the supplementation necessary for hydrolysis of the fluid quantity takes place together with the recirculated hydrolysis fluid having the lower concentration. This method advantageously allows both the hydrolysis products and the hydrolysis residue to be recovered and used in a manner which is economically favorable. The apparatus for carrying out this method is also disclosed.