CS246447B1 - A method for continuous partial hydrolysis of pentosanic raw materials at atmospheric pressure and a device for converting this process - Google Patents

Abstract

The solution relates to a method of continuous partial hydrolysis of pentosan raw materials at atmospheric pressure using catalysts, preferably diluted mineral acids, as well as a device for carrying out the method. The essence of the method is that the pentosan raw material, prepared by crushing or chopping, preheated to a temperature of 90 to 110 °C, is treated with given aqueous solutions of catalysts, preheated to a temperature of 95 to 98 °C, for a period of 60 to 180 minutes in thermally stabilized conditions in the temperature range of 80 to 100 °C, at a hydromodulus of 0.3 : 1 to 1 : : 3, where the obtained product remains in the form of a particulate substance. The novelty of the design of the device is the heating of both the processed raw material and the catalyst and the hydrolysis device in the form of a thermally insulated container.

Description

4 246447

SUMMARY OF THE INVENTION The present invention relates to a process and apparatus for the preparative hydrolysis of pentosanic raw materials at atmospheric pressure, for the processing of plant raw materials characterized by high pentosan content and low lignin content, such as corn pickles, sunflower husks, cereal straw, bagasse, sawdust sawdust. and so on. At present, partial hydrolysis is carried out in plants operating continuously or continuously, at a pressure higher than atmospheric pressure using a suitable catalyst, and using almost exclusively water vapor as the heat transfer medium, it is therefore necessary to dimension the hydrolysis plant to water vapor pressure.

With continuously operating pressure devices there are difficulties in feeding the raw material into the reactor and emptying the ligno-cellulose therefrom. At elevated temperatures, the sugars are subjected to other, especially deihydrating, reactions, which are particularly undesirable in the processing of hydrolysers for the production of D-xylose crystals and in the processing of hydrolysates into feed proteins.

It is known from the prior art to provide a comprehensive process for the processing of vegetable raw materials, where the whole process takes place in a liquid state, and the product obtained is liquid.

If the hydrolysis is carried out at a temperature of up to 100 ° C; substantial longer reaction times are needed in special devices designed for this purpose. At higher temperatures, the reaction time is shortened, but it requires equipment operating at higher high pressures, and since the process is run in a liquid state, larger volumes of hydrolysis apparatus are also required.

The above drawbacks are eliminated by the method and apparatus for the continuous partial hydrolysis of pentosanic raw materials under atmospheric pressure, the principle of which is that the crushed or chopped pentosan feedstock, the pre-heated temperature of 90 ° C to 110 ° C, is water-soluble. catalyst solutions, preheated to 95 to 98 ° C, for 60 to 180 minutes in a heat-stabilized environment in the temperature range of 80 to 100 ° C, for hydromolecules 0.3: 1 to 1: 3, and the hydrolyzedurea obtained in For example, after the neutralization of the catalyst used, it is used directly for feeding purposes or subjected to a fermentation process to transform the pentoses into proteins.

The apparatus for carrying out the method consists of a separating cyclone, connected to the auxiliary intermediate tank, which is provided with a flanging-out bladder and an interrupter, wherein a thread conveyor is provided to the auxiliary storage tank provided with a duplicator for supplying a heating medium which is directly connected to an impregnating device directly connected to a heat insulated container provided with a discharge mechanism. The impregnating device is provided with a conduit for supplying the catalyst water supply to the reservoir with the upstream pump and the heat exchanger.

The hydrolyzed raw material thus obtained can also be treated in other ways, for example by means of a continuous extraction of pentose-burning water to obtain a hydrolyzate for the production of 2-furaldehyde, D-xylose, respectively. whites, while the lignocellulosic residue undergoes delignification. In this alternative treatment, in addition to the basic products, high-quality feed with a digestibility value of 80 to 92% and an organic liquid lignin fertilizer of valuable composition are obtained.

A further alternative to the hydrolyzing thermo-insulating device, e.g., the vibrofluid device, can be the hydrolyzed pentosans containing the feedstock obtained by the process of the present invention to be processed without 2-furaldehyde extraction at a temperature of 160-220 ° C. -furaldehyde, water vapor, a pair of acetic acid and methanol are led directly by rectification. The strong degraded dry lignocellulosic residue is used in this case as fuel for the energy coverage of the process.

The novelty of the process for the partial hydrolysis of plant raw materials according to the invention is that the processed raw material retains the properties of particulate matter even after hydrolysis. A further advantage is that the hydrolysis takes place at atmospheric pressure, continuously directly in the thermally insulated container, and the product obtained can be used directly for feeding after neutralization of the catalyst, or the protein can be enriched by pentose fermentation. The advantage of the device for carrying out the process is in particular its simplicity, the heating of both the feedstock and the catalyst and the hydrolysis in the thermally insulated reservoir.

In the drawings, FIG. 1 is a schematic representation of the connection of successive elements of the device according to the invention.

The device according to the invention, as shown in FIG. 1, consists of a separating cyclone 1 connected to an intermediate intermediate storage tank 2, provided with a discharge mechanis 3 and a crusher 4. with a duplicator 6, the supply of a heating medium, which is directly connected to the device 7, directly connected to the thermally insulated container 8, which is equipped with a discharge device 9. The impregnation device 7 is still provided with a catalyst solution feed line connected to the reservoir 10, p

Claims (2)

The apparatus according to the invention operates in such a way that the sorted pulp of the maize crops of the aébiinous plant raw materials is pneumatically conveyed from the covering stock to the separating cyclone 1, from where it falls into the auxiliary storage tank 2. the pulp is discharged into the screw conveyor 5, and thus transported to the impregnating device 7. In said screw conveyor 5, the gypsum preheats to a temperature of 100 ° C and 1.5% of acid-sulfuric acid H2SO4, heated in the impregnating device 7, is sprayed on the pre-heated feedstock. a heat exchanger 12 at a temperature close to boiling, in the range of 95 to 98 ° C. The solution is pumped through the pump 11 from the reservoir 115. The impregnated grit is passed to a thermally insulated bladder 8 which is dimensioned such that the residence time of the material therein is 120 minutes at a continuous path. The hydrolyzed product is removed for further processing by means of a discharge mechanism 9. Example Corn pulp with a grain size of up to 5 mm, 10 kg, 90% dry matter, preheated to 105 ° C was impregnated with 18 kg of a 1.5% sulfuric acid solution at 98 ° C. The impregnated feedstock was subjected to hydrolysis with an insulated reservoir for 120 minutes. It was found by the laboratory solution that from the thus obtained hydrolyzed crumb, water extraction at 80 ° C was carried out at a rate of 3.4 kg, ie 38% , calculated on an absolute dry raw material. P R E D Μ E T A method of continuous partial hydrolysis of pentosan. raw materials at atmospheric pressure, using catalysts, preferably dilute mineral acids, at a concentration of 0.1 to 5.0%, characterized in that the treated penzane raw material is pre-heated to 90 by crushing or chopping up to 110 ° C are caused by the given aqueous catalyst solutions, preheated to a temperature of 95 to 98 ° C, for a period of 60 to 180 minutes in thermally stabilized conditions in a temperature range of 80 to 100 ° C; up to 1: 3, where the obtained productivity in the form of particulate matter. 2. A device according to claim 1, characterized in that it comprises a separating cyclone (1) connected to an auxiliary intermediate tank (2) provided with a discharge mechanism (3) and the vibration diverter (4), wherein said intermediate storage tank (2) is connected to a screw conveyor (5) provided with a duplicator (6), a supply of heating medium connected to the impregnating device (7) directly connected to a thermally insulated container (8) provided with an emptying mechanism (9), wherein said impregnating device (7) is still provided via a conduit for supplying a catalyst water supply connected to the container (10) with a pre-pump (11i and heat exchanger (12)) 1 sheet of drawings