| 摘要 |
1483132 Solid/liquid contact A GEMASS 13 Jan 1975 [16 Jan 1974] 1300/75 Heading B1F [Also in Divisions C2 and D2] A method for the continuous acid hydrolysis of pentosan-containing cellulosic fibre vegetable material, see Fig. 1, comprises feeding said material from hopper 1 into a hydrolysis vessel 3, introducing a hydrolysate comprising an acid, e.g. dilute H 2 SO 4 , into the vessel and maintaining: the temperature therein at 80‹- 120‹C and the pH of the hydrolysate at a value less than 5, withdrawing cellulosic fibrous material and pentosan-containing hydrolysate from the vessel via outlet 4, separating the latter from the former in separator 6 and collecting it in container 8, returning a major part of the hydrolysate from container 8 to the hydrolysis vessel via line 22 and passing the remainder via line 27 to a conversion plant, washing the separated cellulosic fibrous material in vessel 10 with water supplied via line 12, separating the wash liquors from the fibrous material in separator 14 and collecting said liquors in container 16, supplying acid via line 28 to the wash liquors in the container 16 to form a hydrolysate having the original acid concentration, and returning the latter via line 20 to the hydrolysis vessel. The fibrous material separated in separator 14 may be passed via line 30 to a conversion plant for conversion, e.g. into cellulose, animal fodder, or monosaccharides. In another embodiment, see Fig. 2, a V-shaped hydrolysis vessel and countercurrent flow techniques are used. The raw material may be bagasse or corn cob residues. |
