FI12327U1 - Solid fraction - Google Patents

Description

FIXED FRACTION

FIELD OF THE INVENTION

The invention relates to a solid fraction comprising solids consisting of lignocellulosic material.

BACKGROUND OF THE INVENTION

Various methods of forming carbohydrates from various raw materials such as biomass are known in the art. In many biorefinery processes, e.g. hydrolysis, lignin and sugars are formed after biomass treatment.

PURPOSE OF THE INVENTION

It is an object of the invention to provide a novel process for producing a high concentration of soluble carbohydrate fraction. Another object of the invention is to provide a fraction containing soluble carbohydrates in higher concentration and improved recovery. One object of the invention is to improve the fractionation of biomass to produce an improved concentrated liquid fraction containing soluble carbohydrates in a high recovery rate and to produce a solid fraction free of soluble materials.

SUMMARY OF THE INVENTION

The solid fraction of the present invention is characterized by what is disclosed in protective claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are appended to illustrate the invention and which are part of this disclosure, illustrate some embodiments of the invention and are used in conjunction with the description to assist in explaining the principles of the invention. In the drawings:

Figure 1 is a flowchart of a method according to an embodiment of the present invention,

Figure 2 is a flowchart of a method according to another embodiment of the present invention,

Figure 3 is a flowchart of a method according to another embodiment of the present invention,

Fig. 4 is a flowchart of a method according to another embodiment of the present invention,

Fig. 5 is a flowchart of a method according to another embodiment of the present invention,

Fig. 6 is a flowchart of a method according to another embodiment of the present invention,

Fig. 7 is a flowchart of a method according to another embodiment of the present invention,

Figure 8 shows the results of an example carried out in accordance with an embodiment of the present invention,

Figure 9 shows the results of an example carried out in accordance with an embodiment of the present invention, and

Figure 10 shows the results of an example carried out in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

A method for increasing the concentration of a liquid fraction comprising soluble carbohydrates, such as a fraction containing soluble carbohydrates, wherein the lignocellulosic material (3) formed by treating the plant-based raw material (1) is introduced into a separating section (4,6). The method comprises at least one solid-liquid separator (4.6) for separating the soluble carbohydrate-containing fraction (10) and / or the wash filtrate (12) from the lignocellulosic material (3). The separation section comprises one or more separation steps. At least part of the soluble carbohydrate-containing fraction (10) and / or the washing filtrate (12) is recycled to the lignocellulosic material (3), preferably prior to the desired separation step of the separating section (4,6), to increase the concentration of soluble carbohydrates. The fraction (10) containing solids (11) and at least a portion of the soluble carbohydrates (10) is fed off from the separator. In one embodiment, at least a portion of the washing filtrate (12) is discharged from the separating portion.

An embodiment of the present invention is shown in Figure 1. Another embodiment of the present invention is shown in Figure 2. Another embodiment of the present invention is shown in Figure 3. Another embodiment of the present invention is shown in Figure 4. Another embodiment of the present invention is Figure 5. Another embodiment of the present invention is shown in Figure 6. Another embodiment of the present invention is shown in Figure 7.

The apparatus comprises at least one solid-liquid separator (4,6) for introducing lignocellulosic material (3) formed by treating the plant-based raw material (1) and separating the fraction (10) containing soluble carbohydrates and / or the washing filtrate. (12) a list of lignocellulosic materials (3). The apparatus further comprises at least one feed device, such as a pump, for feeding the lignocellulosic material (3) to the separation device (4,6). The apparatus further comprises at least one recycling device for recycling at least a portion of the soluble carbohydrate-containing fraction (10) and / or wash filtrate (12) to the lignocellulosic material (3), preferably in front of the desired separator or separation step to increase the concentration of soluble carbohydrate. The apparatus further comprises means, such as a discharge means or a discharge means, for feeding the solids (11) and the fraction (10) containing at least a portion of the soluble carbohydrates out of the apparatus. In one embodiment, the apparatus comprises means for feeding at least a portion of the washing filtrate (12) out of the apparatus.

The invention is based on a solid-liquid separation. Further, the invention is preferably based on the recycling of sugars containing filtrates such as soluble carbohydrate fraction and / or wash filtrate to increase the concentration of soluble carbohydrate fraction. In the invention, the sugar content of the soluble carbohydrate fraction can be increased by recycling the filtrates in various applications. At the same time, the recovery of the liquid soluble carbohydrate fraction can be increased and a more solid solid fraction may be formed. In addition, the carbohydrate content and purity of solids can be increased by the present invention. Furthermore, if the washing filtrate is formed, it can be utilized in the process. In one embodiment, a small amount of washing is used, and thus the concentration of soluble compounds can be further increased. In one embodiment, displacement washes are used to further increase the concentration of soluble compounds and to increase the purity of the solid fraction. In this context, the wash filtrate refers to the dilute filtrate obtained from the washing step in which the ligno-cellulosic material is washed. As used herein, a fraction containing soluble carbohydrates means a filtrate containing soluble carbohydrates, preferably in a high concentration separated from the lignocellulosic material. In a preferred embodiment, the wash filtrate and the soluble carbohydrate fraction contain carbohydrates, preferably C5 sugars (Ο5Η10Ο5 or (C5 (H2O) n). The soluble carbohydrate fraction may comprise carbohydrates such as monosaccharides (C6 H12 and / or polysaccharides ((CgHxo05) or (CsHgOJn) · Preferably, the soluble carbohydrate fraction comprises soluble C5 carbohydrates and (Ο5Η10Ο5 or C5 (H2O) n) and other carbohydrates. In a preferred embodiment, the solids comprise carbohydrates, and preferably C6 carbohydrates and (C6H12O6 or C6 (H2O) n) solids. The solids may also include other carbohydrates and other components. Herein, the plant-based raw material means any plant-based raw material. , e.g., wood-based raw material The plant-based raw material contains lignin, cellulose and hemicellulose. In one embodiment, the vegetable-based raw material is selected from the group consisting of wood-based raw material, wood, lignocellulosic biomass, agricultural residues, sugar-cane-based material, sugar-cane-based, and mixtures thereof and combinations thereof. In one embodiment, the plant-based raw material is a wood-based raw material or a mixture comprising a wood-based material. In one embodiment, the plant-based raw material comprises plant fragments, e.g., wood fragments. As used herein, lignocellulosic material means any lignocellulosic material formed by treatment, such as pre-treatment, of a plant-based raw material with one or more suitable processing methods. In one embodiment, the lignocellulosic material contains carbohydrates and lignin. Preferably, the carbohydrates have the formula Cn (H2O) n or Cn (H2O) ni · The carbohydrates may comprise monosaccharide and (C6H12O6 or Ο5Η10Ο5), disaccharide and (C12H220n), oligosaccharides and / or polysaccharides ((C6H10O5) 10a) or contains carbohydrates such as soluble C5 carbohydrates and (Ο5Η10Ο5 or C5 (H2O) n) and solid C6 carbohydrates and (C6H12O6 or C6 (H2O) n). The lignocellulosic material (3) is formed from a plant-based raw material (1) and subjected to one or more processing steps (2,5) In one embodiment, the lignocellulosic material is formed or treated by a treatment, preferably a pre-treatment selected from the group consisting of physical treatment. , such as flour extrusion, microwave, ultrasonic and freezing, chemical treatment such as acid treatment, alkaline treatment, ionic liquid treatment, organosolv treatment and ozonolysis, physico-chemical treatment such as steam blasting, steam blasting, treatment with liquid hot water and wet oxidation; biological treatment and combinations thereof. Preferably, the plant-based raw material is treated to dissolve hemicellulose. In one embodiment, the lignocellulosic material is formed or treated by hydrolysis, e.g., acid hydrolysis, autohydrolysis, thermal hydrolysis, enzymatic hydrolysis, supercritical hydrolysis, and / or alcritical hydrolysis, wherein at least a portion of the raw material is separated by hydrolysis. In one embodiment, the lignocellulose is formed or treated by steam blasting of hemicellulose and wherein at least some of the polysaccharides of the hemicelluloses are degraded to monosaccharides and oligosaccharides. In one embodiment, the lignocellulosic material is formed or treated by hydrolysis and steam blasting in one or more steps. In one embodiment, the lignocellulosic material is formed or treated by catalytic pretreatment, e.g., using an acid or base as a catalyst. In the pretreatment process, the plant-based feedstock is fed to the reactor unit where the pretreatment takes place. The lignocellulosic material may be treated with one or more treatments. The treated lignocellulosic material can then be blown into a blow tank. Further, the lignocellulosic material can advantageously be dewatered, e.g., by dewatering presses in two parts. Dewatering enables the separation of sugar-based streams. In one embodiment, the lignocellulosic material consists of fine solid particles. Thanks to the fine particle size, high yields and low degradation rates can be achieved in the process. Preferably, the fine solid particles are fibrous or unspecified particles smaller than 0.2 mm, or particles small enough to pass a Bauer McNett 200 mesh screen. The particle size of the lignocellulosic material may be measured, for example, by an optical measuring device such as Metso FS5 or a laser diffraction method such as Coulter LS230. Particle size values depend on the method and therefore the values obtained from Metso FS5 and Coulter LS230 cannot be directly compared with one another. The particle size of the solid particles can be determined according to ISO 16065-N or TAPPI T271. The pretreatment process reduces the particle size and fiber length of the original wood fiber, which can be determined by separating the fibers by boiling the wood, e.g. As a result of the suiting process, the fiber length is about 80% of the post-maceration fiber length.

In one embodiment, the lignocellulosic material has a dry solids content of 20 to 80% by weight after pretreatment. The dry matter content is determined by evaporation at 45 ° C. When the dry matter content is determined at 45 ° C, low molecular weight organic compounds remain in the pulp during drying. In one embodiment, the dry matter determination may be based, at least in part or applicable, on the National Renewable Energy Laboratory (NREL) Laboratory Analytical Procedures to perform standard biomass analysis as defined in Technical Report NREL / TR-510-48087 (July 2011). ). In one embodiment, the lignocellulosic material is diluted with liquid, preferably water, or water vapor to form a feed of lignocellulosic material to the separating portion. In one embodiment, the feed concentration of the lignocellulosic material to the solid-liquid separator is 2 to 60% by weight, preferably 5 to 30% by weight, more preferably 10 to 20% by weight. If the feed concentration of the lignocellulosic material is low, then the size of the device increases. Preferably the fraction containing the wash filtrate and / or soluble carbohydrates which is recycled to the lignocellulosic material is used to dilute the lignocellulosic material.

In one embodiment, the lignocellulosic material is fed to the solid-liquid separator by a pump, e.g., a mono pump or a piston pump or other suitable pump. The pump selection is based, for example, on the feed concentration and / or viscosity of the lignocellulosic material.

The solid-liquid separator may comprise one or more separation steps. In one embodiment, the solid-liquid separation is performed in one or more separation steps in the separating section. In one embodiment, the solid-liquid separation section comprises more than one successive separation step. In one embodiment, the solid-liquid separator comprises various operations that can be performed in separate separation steps. Alternatively, more than one operation is performed in one process step.

In one embodiment, separation of the soluble carbohydrate-containing fraction and the washing filtrate is carried out in the same separation step. In one embodiment, separation of the soluble carbohydrate-containing fraction and the washing filtrate is performed in separate separation steps. In one embodiment, the fraction containing soluble carbohydrates is separated in one step. In one embodiment, the fraction containing soluble carbohydrates can be separated in a first step in a two-step process or a multi-step process. In one embodiment, the fraction containing soluble carbohydrates can be separated in the final step in a two-step process or a multi-step process. In one embodiment, the fraction containing soluble carbohydrates can be separated between the first and last step. Alternatively, the fraction containing soluble carbohydrates may be separated in more than one step. In one embodiment, some of the soluble carbohydrates or some of the fraction containing the soluble carbohydrates may be separated during the pretreatment process in which the lignocellulosic material is formed and / or treated. In one embodiment, the wash filtrate is separated in one step. In one embodiment, the wash filtrate is separated in more than one step. In one embodiment, the fraction containing the soluble carbohydrates and / or the washing filtrate is separated at each separation step.

In one embodiment, the wash filtrate is not separated from the lignocellulosic material (3). In this case, only the fraction (10) containing soluble carbohydrates is separated from the lignocellulosic material (3). In one embodiment, the washing step is not performed, and no washing filtrate is formed. Only the fraction (10) containing soluble carbohydrates is separated from the lignocellulosic material (3).

In one embodiment, the method comprises more than one partition. In one embodiment, the method comprises more than one successive separation part.

In one embodiment, the apparatus comprises more than one separation device. In one embodiment, the solid-liquid separator comprises at least one separator. In one embodiment, the solid-liquid separator comprises more than one separator. In one embodiment, one or more separation steps may be performed in the same separation device. In one embodiment, the separation device comprises one or more separation steps, e.g., a separation segment.

In one embodiment, the separation device is based on counter current washing. In one embodiment, the separation device is selected from the group consisting of a filtration device, a centrifuge device, and combinations thereof. In one embodiment, the separation device is selected from the group consisting of a pressure filtration device, a vacuum filtration device, a vacuum-based filtration device, an overpressure-based filtration device, a filter press, another suitable press, a centrifuge device, and combinations thereof. In one embodiment, the separation device is a pressure filtration device, a vacuum filtration device, a vacuum-based filtration device, or a pressure-pressure filtration device. Alternatively, the separator may be another washing machine using a low amount of washing water and washing at a high solids content. Good recovery can then be achieved.

Preferably, the solid-liquid separator comprises separating the soluble carbohydrate-containing fraction and / or the wash filtrate from the lignocellulosic material. In one embodiment, the fraction containing the soluble carbohydrates and / or the washing filtrate is separated from the lignocellulosic material by filtration, centrifugation or combinations thereof. In one embodiment, the filtration is effected by means of pressure, vacuum or excess pressure.

In one embodiment, the solid-liquid separator comprises filtration in which the fraction containing soluble carbohydrates is separated in liquid form and a solid cake is formed. Preferably, pressure is applied to the filtration. In one embodiment, the liquid is separated by a differential pressure such as vacuum or overpressure. In one embodiment, the solid-liquid separator comprises washing, which is a displacement wash of the lignocellulosic material with a small amount of pure water so as to remove most of the sugars, inhibitors and other soluble compounds from the solid lignocellulosic material and provide a high recovery of soluble compounds. Preferably, the ratio of wash water to solids is less than 6, preferably less than 3, and more preferably less than 1.5. In one embodiment, the solid-liquid separator comprises filtration and washing. In one embodiment, the filtration and washing is carried out in a static chamber, preferably a stationary chamber. In one embodiment, the filtration and washing is carried out in a single apparatus under pressure without agitation between filtration and washing. Preferably, said separation device comprising filtration and washing is in a vertical or horizontal plane, not in an inclined plane. A high concentration and recovery rate of soluble material in the liquid phase can be achieved with a small amount of pure water and a solid fraction free of soluble compounds can be obtained.

In one embodiment, the separation member comprises extraction, liquid separation, and washing.

In one embodiment, the fraction containing the soluble carbohydrates and / or the wash filtrate is separated from the lignocellulosic material by pressure filtration. In one embodiment, the apparatus comprises at least one pressure filtration device as a solid-liquid separator. In one embodiment, the solid-liquid separator comprises a single pressure filtration device. In one embodiment, the solid-liquid separator comprises more than one pressure filtration device. In a preferred embodiment, washing in a pressure filtration device is based on displacing the liquid. In one embodiment, the pressure filtration comprises a pumping step, pressing, washing step, pressing and cake removal. In the pumping step, the solid cake is formed and pressed. Preferably, in the pumping step, the chamber of the pressure filtration device is filled and precompressed. In one embodiment, after the pumping step or after the first pressing step, air blowing is performed to further remove the liquid from the cake. Preferably, the fraction containing soluble carbohydrates is separated during the pumping step. In the washing step, washing water is squeezed through the cake and the cake is squeezed and preferably drains water. During the washing step, the cake liquid can be replaced with water. In one embodiment, the washing step is air blown to further remove liquid from the cake. The wash filtrate is separated by squeezing during the washing step. The dewatered solid cake is removed from the pressure filtration device. Preferably, the dewatered solid cake forms a solid fraction. The advantage of pressure filtration is that all separation steps can be performed on a single device.

Separation may be carried out in different separation sections by the same or different separation methods or separation devices.

In one embodiment, the amount of wash filtrate is optimized by adjusting the wash water ratio. In one embodiment, the ratio of wash water to solid composition is 1: 1 to 6: 1, preferably 1: 1 to 5: 1, more preferably 1: 1 to 4: 1, most preferably 1: 1 to 3: 1. Preferably, the water balance is optimized in the method of the present invention.

In one embodiment, at least a portion of the wash filtrate and / or fraction containing the soluble carbohydrates is recycled to the lignocellulosic material in front of the separation section. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled to the lignocellulosic material in front of the desired separation step, e.g., the first separation step or between two separation steps. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled to lignocellulosic material which is fed to the same separator. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled to the lignocellulosic material, which is fed to the next separation section or to the next separation section of the separation section. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled by feeding it to a blow tank, the inlet side of the solid-liquid separator, the inlet side of the feeder or the first stage of the solid-liquid separator, e.g. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled to the desired separation step of the separator, e.g., a segment. In one embodiment, at least a portion of the wash filtrate and / or the fraction containing soluble carbohydrates is recycled to an earlier separation step, e.g. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled to an earlier separation step, e.g., a segment, from each separation step in the separation device. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is continuously recycled. In one embodiment, at least a portion of the wash filtrate and / or fraction containing soluble carbohydrates is recycled at each separation step or each separation section. Recycling can reduce the amount of wash water.

In one embodiment, the wash filtrate is recycled, preferably completely, to the lignocellulosic material. In one embodiment, 80-100% by weight of the wash filtrate is recycled to the lignocellulosic material. In one embodiment, the wash filtrate contains wash water and carbohydrates such as galactose, glucose, mannose, arabinose, xylose, glucuronic acid and galacturonic acid. In addition, the wash filtrate may contain soluble lignin.

In one embodiment, at least a portion of the soluble carbohydrate-containing fraction is recycled to the lignocellulosic material. In one embodiment, less than 80 wt.%, In one embodiment less than 50 wt.%, In one embodiment less than 20 wt.%, And in one embodiment less than 20 wt.%, The soluble carbohydrate fraction of any liquid containing soluble carbohydrates and other compounds is recycled to lignocellulose. .

In one embodiment, the fraction of soluble carbohydrate-containing fraction in the recirculated air filtrate may be 0 to 95%, more preferably 60 to 90%, in a single step process. When the wash filtrate is also used as dilution water, the fraction of soluble carbohydrate-containing fraction can be recycled from 0 to 90%, more preferably from 35 to 80%, in a single step process.

In one embodiment, at least a portion of the soluble carbohydrate-containing fraction is recycled to the lignocellulosic material. In one embodiment, the wash filtrate is recycled to the lignocellulosic material. In one embodiment, the mixture of wash filtrate and fraction containing soluble carbohydrates is recycled to the lignocellulosic material. In one embodiment, the wash filtrate and the fraction containing soluble carbohydrates are mixed to form a mixture, and the mixture is recycled to the lignocellulosic material.

Preferably, the feed concentration of the lignocellulosic material is optimized by means of a recycling composition.

In one embodiment, the sugar concentrate of the fraction containing soluble carbohydrates is optimized. Preferably, the fraction containing soluble carbohydrates contains soluble C5 carbohydrates. The total carbohydrate content can be measured by HPLC after acid hydrolysis according to SCAN-CM 71: 9. The concentration of monomeric carbohydrates can be measured by HPLC directly from the liquid fraction without acid hydrolysis. The fraction containing soluble carbohydrates may also contain C6 carbohydrates, preferably less than 20% by weight. Preferably, the fraction containing soluble carbohydrates may contain other monosaccharides, disaccharides, oligosaccharides and / or polysaccharides. In one embodiment, the soluble carbohydrate-containing fraction contains galactose, glucose, mannose, arabinose, xylose, glucuronic acid, and galacturonic acid. In one embodiment, the fraction containing soluble carbohydrates comprises soluble C5 carbohydrates such as Ο5Ο10Ο5 or C5 (H2O) n / and other carbohydrates and some other compounds. In one embodiment, the soluble carbohydrate-containing fraction has a soluble carbohydrate concentrate of greater than 50 g / l, preferably greater than 70 g / l, more preferably greater than 100 g / l after solids separation. In one embodiment, the soluble carbohydrate fraction has a soluble carbohydrate concentrate of less than 250 g / l, in one embodiment less than 200 g / l, in another embodiment less than 150 g / l of solid-liquid separation. In one embodiment, the soluble carbohydrate-containing fraction has a soluble carbohydrate concentration of 15 to 280 g / l, preferably 30 to 200 g / l, more preferably 50 to 165 g / l after solids separation. Preferably, the fraction containing soluble carbohydrates is in the form of a solution. In one embodiment, the water-soluble substance is present after 20 to 425 g / l, preferably 45 to 303 g / l, more preferably 75 to 250 g / l, after the solid-liquid separation. The water-soluble substance may be determined by the method described hereinafter as the "gravimetric washing method".

Preferably, at least a portion of the fraction containing soluble carbohydrates is expelled from the separation portion. The fraction containing soluble carbohydrates may be dispensed after any desired step in the separation section. In one embodiment, the fraction containing soluble carbohydrates is dispensed after the first step of the separation section.

In one embodiment, a high concentration of soluble carbohydrate fraction (10) can be formed. The soluble carbohydrate fraction is formed from a lignocellulosic material (3) formed by treating a vegetable-based raw material (1), wherein the soluble carbohydrate fraction is formed by separating the soluble carbohydrate fraction (10) and / or (3) in one or more separating portions (4,6) and recycling at least a portion of the soluble carbohydrate-containing fraction and / or wash filtrate to increase the concentration of the soluble carbohydrate-containing fraction in the lignocellulosic material. The fraction containing soluble carbohydrates can be used as a component in the preparation of the final product.

In one embodiment, a portion of the fraction (14) containing soluble carbohydrates is separated from the lignocellulosic material (3) during a pretreatment step (2.5) in which the lignocellulosic material is formed and / or treated. The fraction (14) containing soluble carbohydrates may be separated by a similar separation process or apparatus used in the separation section (4,6) or by any other suitable separation process or apparatus.

In one embodiment, two soluble carbohydrate-containing fractions (10,14) can be formed at a high concentration and with a high degree of recovery of the soluble compounds. The two soluble carbohydrate-containing fractions are formed from the lignocellulosic material (3) formed by treating the plant-based raw material (1) in two or more steps. A first fraction (14) containing soluble carbohydrates is formed by separating some of the soluble compounds between the first and last pretreatment step (2,5) and a second fraction (10) containing soluble carbohydrates is formed by separating most of the soluble compounds after the final pretreatment step. Preferably, the second soluble carbohydrate-containing fraction (10) is separated in the separating portion (4) so that the soluble carbohydrate-containing fraction and / or wash filtrate is separated from the solid lignocellulosic material and at least a portion of the soluble carbohydrate-containing fraction and / or wash filtrate Fractions (14) and (10) containing soluble carbohydrates may be combined or used separately as a component in the preparation of the final product. Combined or separate fractions containing soluble carbohydrates may be concentrated for further use.

In one embodiment, two soluble carbohydrate-containing fractions (10,14) can be formed at a high concentration and with a high degree of recovery of the soluble compounds. The two soluble carbohydrate-containing fractions are formed from the lignocellulosic material (3) formed by treating the plant-based raw material (1) in two or more steps. The first fraction (14) containing soluble carbohydrates is formed such that the liquid to solid ratio (w / w) of the lignocellulosic material is less than 5: 1, preferably less than 4: 1, more preferably less than 3: 1, and most preferably less than 2: 1. between the first and the last pretreatment step (2,5). The second fraction (10) containing soluble carbohydrates is formed by separating most of the soluble compounds after the final pretreatment step. Preferably, the second soluble carbohydrate-containing fraction (10) is separated in the separating portion (4) so that the soluble carbohydrate-containing fraction and / or wash filtrate is separated from the solid lignocellulosic material and at least a portion of the soluble carbohydrate-containing fraction and / or wash filtrate The amount of fresh wash water is less than 4: 1 (liquid: solid (w / w)), preferably less than 3: 1, more preferably less than 2: 1, most preferably close to 1: 1. The solids carbohydrate fraction removal efficiency must be high and higher than 60%, preferably greater than 70%, more preferably greater than 80%, most preferably greater than 90%. Fractions (10) and (14) containing soluble carbohydrates may be combined or used separately as a component in the preparation of the final product. Combined or separate fractions containing soluble carbohydrates may be concentrated for further use.

In one embodiment, a fraction (10) containing soluble carbohydrates can be formed at a high concentration and with a high degree of recovery of the soluble compounds. The fraction containing soluble carbohydrates is formed from the lignocellulosic material (3) formed by treating the plant-based raw material (1) in one or more steps. The fraction containing the soluble carbohydrates is formed by separating most of the soluble compounds after the final pretreatment step (2,5) so that the fraction and / or washings containing the soluble carbohydrates are separated from the solid lignocellulosic material and the at least part of the increase. The fraction containing soluble carbohydrates can be used as a component in the preparation of the final product. Fractions containing soluble carbohydrates may be concentrated for further use.

In one embodiment, a fraction (10) containing soluble carbohydrates can be formed at a high concentration and with a high degree of recovery of the soluble compounds. The fraction containing soluble carbohydrates is formed from the lignocellulosic material (3) formed by treating the plant-based raw material (1) in one or more steps. The fraction containing the soluble carbohydrates is formed by separating most of the soluble compounds into the residue of the final pretreatment step (2,5) so that the fraction and / or washings containing the soluble carbohydrates are separated from the solid ligno-cellulosic material and at least a portion to increase the concentration of the carbohydrate-containing fraction. The amount of fresh wash water is less than 4: 1 (liquid: solid (w / w)), preferably less than 3: 1, more preferably less than 2: 1, most preferably close to 1: 1. The solids carbohydrate-containing fraction must have a high solids removal efficiency of greater than 70%, preferably greater than 80%, more preferably greater than 90%, most preferably greater than 95%. The fraction containing soluble carbohydrates can be used as a component in the preparation of the final product. Fractions containing soluble carbohydrates may be concentrated for further use.

In one embodiment, the fraction containing soluble carbohydrates is recovered. In one embodiment, the fraction containing soluble carbohydrates is fed for further processing. In one embodiment, the fraction containing the soluble carbohydrates is subjected to monomerization before further processing. In one embodiment, the fraction containing soluble carbohydrates is fed to the fermentation process. In one embodiment, the soluble carbohydrate-containing fraction is used as the starting material in the fermentation. In one embodiment, the fraction containing soluble carbohydrates is fed to the hydrolysis process. In one embodiment, the soluble carbohydrate-containing fraction is used as starting material in hydrolysis such as acid hydrolysis, enzymatic hydrolysis, or the like. In one embodiment, the fraction containing soluble carbohydrates is fed to the catalytic treatment process. In one embodiment, the soluble carbohydrate-containing fraction is used as the starting material in the catalytic process. The fraction containing the soluble carbohydrates may be fed directly to the fermentation, hydrolysis, catalytic treatment or other suitable process, or alternatively, via a suitable treatment or further step, e.g., additional concentration or purification step, to fermentation, hydrolysis, catalytic processing.

In one embodiment, at least a portion of the washing filtrate is fed to another process or process step. In one embodiment, the wash filtrate is used as dilution water in another process, e.g., a pretreatment process. In one embodiment, the wash filtrate is used as wash water in another process.

The solids (11) are discharged from the solid-liquid separator (4.6). In one embodiment, a solid fraction comprising solids is discharged from the solid-liquid separator. In one embodiment, the solid fraction comprising solids (11) is formed from a lignocellulosic material (3) formed by treating the plant-based raw material (1) so that the solid fraction is formed by separating the soluble carbohydrate-containing fraction (10) and / or ) from the solid lignocellulosic material in at least one solids-liquid separator (4,6) and recycling at least a portion of the soluble carbohydrate-containing fraction and / or washing filtrate to the lignocellulosic material (3), and the solids (11) are recovered from the separator. In one embodiment, the solids comprise C6 carbohydrates and, such as (C6H12O6 or (C6 (H2O) n), other solid carbohydrates and lignin, and some other compounds such as some residual soluble material. In one embodiment, the solid fraction is in the form of a cake. In one embodiment, the cake has a dry solids content of 40 to 80% by weight, preferably 45 to 70% by weight, more preferably 50 to 60% by weight, after a solids-liquid separator. , preferably 15 to 45% by weight, more preferably 25 to 35% by weight, after the solid-liquid separator. In one embodiment, the solid fraction contains soluble compounds less than 15%, preferably less than 6%, more preferably less than 3% by weight of the solid-liquid separator In one embodiment, the water-soluble substance is determined by a gravimetric washing method. The dry matter content (DM%) of the raw material, eg solid and soluble fraction, is measured at 60 ° C, the amount of solids remaining after the sample has been heated at 60 ° C to constant weight, measure and calculate the dry matter content on the basis of wet and dry weight. For washing, take about 10 g of absolute dry material, weigh it (exact weighed amount) and mix with hot water (50 ° C) in a total vessel of 200 g, mix for 20 s (Bamix Mono Hand Mixer, 'C') blade, speed 1 (7000 rpm)), soak mixture for 5 min, blend for 10 s (Bamix Mono rod blender, C'blade, speed 1 (7000 rpm)), measure dry filter paper pulp, filter using Buchner filter (125 mm diameter) and filter paper, close the vacuum valve when the cake is completely matte (dry), remove the filtrate and wash the mixer and container with filtrate and re-filter the filtrate through the cake, wash the cake three times with 100 g of hot water. maintaining the suction effect and adding wash water (100 g) when the cake is completely matt (dry), weighing the foil pan, drying the cake and filter paper in the foil pan, drying the cake (60 ° C), and the filter paper is weighed in the foil flow and the weight of the filter paper and the foil flow is subtracted from the mass of the dried cake, filter paper and foil flow and then the soluble non-soluble solids (WIS) of the test material can be determined. The water insoluble solids, WIS%, can be calculated as follows: WIS% = (weight of washed and dried material, e.g. cake) / (weight of wet wash slurry, e.g. raw material). The water soluble solids content of the solids, WS%, can be calculated as follows: WS% = (Initial slurry, e.g., raw material, solids (DM%) - (water insoluble solids, WIS%). In one embodiment, the high solubility of the raw material at a concentration of material (25-50% soluble in total solids), the solid fraction contains less than 15%, preferably less than 9%, more preferably less than 5% by weight of soluble compounds as measured by the gravimetric washing method. at a concentration of material (less than 25% soluble in total solids), the solid fraction contains less than 9%, preferably less than 6%, more preferably less than 3% by weight of soluble compounds as measured by the gravimetric washing method.

The particle size of the solid particles can be determined, for example, by an optical measuring device such as Metso FS5 or by a laser diffraction method such as Coulter LS230. In one embodiment, the particle size of the solid particles can be determined based on ISO 16065-N or TAPPI T271 standards. The fiber length of solid particles can be determined by reference to ISO 16065-N, when the fibers are defined as material longer than 0.2 mm. The fiber length of solid particles can be determined by the TAPPI T271 standard for fiber lengths of 0.01 to 7.60 mm. In the case of Metso FS5, Le denotes the extreme length, i.e. the fiber length of the centerline, which is the fiber length measured from one end of the fiber centerline to the other. Length Weighted Lc (1) means Length Weighted Fiber Length, which is the average fiber length measured from fiber distribution weighted according to TAPPI T271 standards. Weighted Le (w) means weighted fiber length, which is also the average fiber length measured from the fiber distribution weighted according to TAPPI T271. Arithmetic Le (n) means the arithmetic mean calculated from the fiber population distribution. As a result, the average length is calculated from the length distribution. F1 (l)% is the length-weighted distribution% (width> 10 µm, length <0.2 mm). Fiber width is measured as an integral value to account for the tapered ends of the fiber.

In one embodiment, the length-weighted particle length Lc (1) is less than [(0.4) x (fiber length of the corresponding crude pulp)], preferably less than [(0.3) x (fiber length of the corresponding crude sulphate pulp)], more preferably less than [( 0.2) x (fiber length of corresponding crude sulphate pulp)], most preferably less than [(0.1) x (fiber length of corresponding crude sulphate pulp)].

In one embodiment, the fine particles have a width (0-0.2 mm fraction) of less than [(0.7) x (fiber length of the corresponding untreated sulphate pulp)], preferably less than [(0.6) x (fiber length of the corresponding untreated sulphate pulp)], more preferably less than [(0.5) x (fiber length of the corresponding crude sulfate pulp)], most preferably less than [(0.4) x (fiber length of the corresponding crude sulfate pulp)].

In one embodiment, the solid fraction comprises fine solid particles of fibrous or undefined particles having a longest dimension less than 0.2 mm as measured by a Metso FS5 optical fiber (F1 (1) for Length Weighted (Lc (1)) Measurements and Calculations) In one embodiment, the hardwood solid fraction comprises particles having a longest dimension less than 0.2 mm, greater than 70% (E1 (1)> 70%), preferably greater than 80%, more preferably greater than 90%, and most preferably greater than 98%. by weight as determined by Metso FS5 In one embodiment, the softwood solid fraction comprises particles having a longest dimension less than 0.2 mm, greater than 50% (E1 (1)> 50%), preferably greater than 60%, more preferably greater than 70% and most preferably more than 80% by weight as determined by Metso FS5.

In one embodiment, the solid fraction comprises fine solid particles which are fibrous or undefined. The length-weighted length Lc (l) of the solid fraction as measured by TAPPI T271 includes all observed particles that meet the measurement requirements. The TAPPI T271 standard specifies the fiber length of a material so that its longest dimension is 0.01 to 7.60 mm.

In one embodiment, the solid fraction comprises fine solid particles which are fibrous or undefined. The length-weighted length Lc (l) of the solid fraction is measured with a Metso FS5. The length-weighted Le (1) value is 40% or less of the fiber length of the corresponding crude sulfate mass, preferably 30% or less, more preferably 20% or less, most preferably 10% or less. And, the length-weighted particles have a fine particle fraction (0-0.2 mm Le (1) fraction) width of 70% or less of the width of the corresponding sulfate pulp fiber, preferably 60% or less, more preferably 50% or less, most preferably 40% or less.

In one embodiment, the solid fraction of hardwood comprises fine solid particles which are fibrous or undefined. The length-weighted length Lc (l) of the solid fraction is measured with a Metso FS5. The length-weighted Le (1) fractions over a fiber length of more than 0.2 mm have 50% or less, preferably 35% or less, more preferably 20% or less, most preferably 5% or less.

In one embodiment, the solid fraction of softwood comprises fine solid particles which are fibrous or undefined. The length-weighted length Lc (l) of the solid fraction is measured with a Metso FS5. The length-weighted Le (1) fractions over a fiber length of more than 0.2 mm have 60% or less, preferably 45% or less, more preferably 30% or less, most preferably 15% or less.

In one embodiment, a solid fraction comprising solids (11) is discharged from the solid-liquid separator (4,6). In one embodiment, the solid fraction is discharged after the last solid-liquid separator. In one embodiment, at least a portion of the solid fraction is discharged between two separation sections or between two separation steps.

In one embodiment, the solid fraction is fed to hydrolysis, which may be selected from the group consisting of acid hydrolysis, enzymatic hydrolysis, supercritical hydrolysis and / or combinations thereof, or to the preparation of a composite material or to a process or other process. The solid fraction may be fed directly to hydrolysis, to the preparation of the composite material, to the combustion process or other suitable process, or alternatively to the hydrolysis, to the preparation of the composite material or to the process for processing, through a suitable processing or additional step, eg additional concentration or purification step.

The process of the present invention provides a fraction containing soluble carbohydrates and a solid fraction in high concentration and good quality. The solid fraction has a very high concentration of lignin and glucan and its Hydra-enriched products. In addition, the solid fraction has a very high purity. In the present invention, the water balance can be optimized. The soluble carbohydrate content can then be increased in the soluble carbohydrate fraction. The present invention provides improved sugar recovery. In addition, the present invention minimizes wastewater and reduces the post-treatment cost of the fraction containing soluble carbohydrates. High concentration is achieved with low energy consumption.

The present invention provides an industrially usable, simple and inexpensive way of forming a high concentration of soluble carbohydrate fraction. The process of the present invention is easy and simple to implement as a production process. The process of the present invention is suitable for use in the preparation of various sugar-based fractions and end products from various starting materials.

EXAMPLES

The invention will be described in more detail in the following examples with reference to the accompanying drawings.

Example 1 In this example, a fraction containing soluble carbohydrates is produced according to the process of Figure 1.

From the vegetable-based raw material (1), lignocellulosic material (3) is formed by pretreatment (2). The lignocellulosic material (3) is fed to a solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material (3). The wash filtrate (12) and at least part of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the pressure filtration device. The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 2 In this example, a fraction containing soluble carbohydrates is produced according to the process of Figure 2.

From the vegetable-based raw material (1), lignocellulosic material (3) is formed by pretreatment (2). The lignocellulosic material (3) is fed to a solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material (3). The wash filtrate (12) is recycled to the lignocellulosic material in front of the pressure filtration device. The fraction (10) containing soluble carbohydrates containing C5 sugars is removed from the pressure filtration apparatus. The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 3 In this example, a fraction containing soluble carbohydrates is produced according to the process of Figure 3.

From the vegetable-based raw material (1), the lignocellulosic material (3) is formed by pretreatment (2). The lignocellulosic material (3) is fed to a solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material. The washing filtrate (12) can be recycled to the pretreatment (2) of the lignocellulosic material. Alternatively, the wash filtrate (12) is removed from the pressure filtration device and recycled to another process. At least part of the fraction (10) containing soluble carbohydrates is recycled to the lignocellulosic material in front of the pressure filtration device. The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 4 In this example, a fraction containing soluble carbohydrates is produced according to the process of Figure 4.

From the vegetable-based raw material (1), the lignocellulosic material (3) is formed by pretreatment (2). The lignocellulosic material (3) is fed to a solid-liquid separator (4) comprising a filtration device. The fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material by filtration. At least part of the fraction (10) containing soluble carbohydrates is recycled to the lignocellulosic material in front of the filtration device. The filter cake removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 5 In this example, a fraction containing soluble carbohydrates is produced according to the two-step process of Figure 5.

The plant-based raw material (1) is formed by the pre-treatment (2), e.g. by grinding, of the lignocellulosic material (3). The lignocellulosic material (3) is fed to a first solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material (3). The wash filtrate (12) and at least part of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the first pressure filtration device. Part of the soluble carbohydrate fraction (10) may be removed from the process prior to the second separation step.

In a second step, the lignocellulosic material (3) is treated by means of a treatment part (5), e.g., by physical, chemical or physico-chemical treatment such as microwave or ultrasonic treatment, or by steam blasting. The lignocellulosic material is fed to a second solid-liquid separator (6) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material. The wash filtrate (12) and at least part of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the first and / or second pressure filtration apparatus. At least part of the fraction (10) containing soluble carbohydrates is removed from the process.

The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 6 In this example, a fraction containing soluble carbohydrates is produced according to the two step process of Figure 6.

The lignocellulosic material (3) is formed from the vegetable-based raw material (1) by pretreatment (2), e.g. The lignocellulosic material (3) is fed to a first solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material (3). The washing filtrate (12) and at least a portion of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the second separation device. Part of the soluble carbohydrate fraction (10) may be removed from the process prior to the second separation step.

In the second step, the lignocellulosic material (3) is treated by means of a treatment part (5), e.g., by physical, chemical or physico-chemical treatment such as microwave or ultrasonic treatment, or by steam blasting. The lignocellulosic material is fed to a second solid-liquid separator (6) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material. The wash filtrate (12) and at least a portion of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the second pressure filtration device. At least part of the fraction (10) containing soluble carbohydrates is removed from the process.

The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues.

Example 7 In this example, a fraction containing soluble carbohydrates is produced according to the process of Figure 7.

The lignocellulosic material (3) is formed from the plant-based raw material (1) by a first pretreatment (2), e.g. by hydrolysis. After pretreatment, a portion of the soluble carbohydrates (14) is separated (13) during the first pretreatment step (2). The lignocellulosic material (3) is fed to a second pretreatment step (5) where the lignocellulosic material is treated, for example, by steam blasting. Thereafter, the lignocellulosic material (3) is fed to a solid-liquid separator (4) comprising a pressure filtration device. During the pumping and compression step of pressure filtration, a fraction (10) containing soluble carbohydrates containing C5 sugars is separated from the lignocellulosic material. During the pressure filtration washing step, the washing filtrate (12) is separated from the lignocellulosic material (3). The wash filtrate (12) and at least part of the soluble carbohydrate-containing fraction (10) are recycled to the lignocellulosic material in front of the pressure filtration device. The pressure filter device removes the solid cake (11) containing e.g. solids, solid carbohydrates, lignin and some soluble sugar, oligomer and polymer residues. At least some of the fractions containing soluble carbohydrates (10,14) are removed from the process.

Example 8 In this example, a fraction containing soluble carbohydrates is produced.

Birch chips were pre-treated in a one-step autohydrolysis and steam blasting process to dissolve hemicellulose. The formed pretreated lignocellulosic material was mixed with hot water and stirred for a few hours. Subsequently, a solid-liquid separation was performed on a two-way Outotec Larox FP 0.3 pressure filter as described in Table 1. The filtration area was 0.27 m2. To simulate the increase in concentration, the soluble carbohydrate filtrate obtained from the first press (10) was used as dilution water for the next round, and after the second filtration, the soluble carbohydrate filtrate obtained from the press was used again for the third filtration dilution. Finally, 5 filtration rounds were performed. The filtration conditions are shown in Table 1.

table 1

Total carbohydrate content was measured according to SCAN-CM 71 standard: acid hydrolysis and HPLC were used. Figure 8 shows that the concentration of carbohydrate increases well in line with the simulated concentration curve.

The simulation of the example was made with the assumption that the soluble carbohydrate content of the pretreated lignocellulosic material is 15.7%, which was also the measured value of the lignocellulosic material, e.g.

cat 8. Figure 9 shows that the concentration of soluble carbohydrate filtrate from the process reaches 104 g / L in a continuous process.

Example 9 In this example, a fraction containing soluble carbohydrates is produced.

Birch chips were pre-treated in a one-step autohydrolysis and steam blasting process to dissolve hemicellulose. The lignocellulosic material formed was mixed with hot water and stirred for a few hours. Subsequently, a solid-liquid separation was performed on a two-way Outotec Larox FP 0.3 pressure filter as described in Table 1. The filtration area was 0.27 m2. The wash water was 2: 1 (water: water-insoluble solids).

The increase in concentration was simulated so that the whole process wash filtrate (12) and some of the first compression soluble carbohydrate filtrate (10) were counted for use as the next round dilution water, and after the second filtration, the wash filtrate and some compression soluble carbohydrate filtrate . In this case, about 77% of the diluent was a soluble carbohydrate-containing filtrate. The recycled fraction containing soluble carbohydrates was 70% of the total soluble compound containing liquid. The washing efficiency was estimated to be 90%. Eventually, more than 70 iterations were performed. The simulation of the example was made with the assumption that the soluble carbohydrate content of the pretreated lignocellulosic material was 15.7%, which was also the measured value of the lignocellulosic material in Example 8.

Figure 10 shows that the concentration of soluble carbohydrate filtrate from the process reaches 102 g / L in a continuous process.

Example 10 In this example, a liquid and solid fraction is produced.

Birch wood chips were pre-treated in a two-step dilute acid-steam blasting process to dissolve hemicellulose and obtain a fraction containing soluble carbohydrates. Part of this fraction containing soluble carbohydrates is removed prior to rapid release of the lignocellulosic material by steam blasting. The lignocellulosic material formed was mixed with hot water and stirred for a while. Subsequently, solid-liquid separation was performed on an Outotec Larox PF 0.1 pressure filter as described in Table 2. The filtration area was 0.1 m2. The amount of wash water was 1: 1 (water: dry cake) and 3: 1. The results are shown in Table 3. The water soluble solids of the dry matter were measured by gravimetric washing.

Table 2

Table 3

Example 11 In this example, a liquid and solid fraction is produced.

Birch wood chips were pretreated in a two-step dilute acid-steam blasting process to dissolve the hemicellulose. The lignocellulosic material formed was mixed with hot water and stirred for a while. Subsequently, a solid-liquid separation was performed on a vacuum filtration filter as described in Table 4 (vacuum filtration in the laboratory). The filtration area was 0.1 m2. The amount of wash water ranged from 0 to 8.6 (water: cake dry).

Table 4

Example 12 In this example, a concentrated liquid and purified solid fraction is produced based on Example 10.

Birch wood chips were pretreated in a two-step dilute acid-steam blasting process to dissolve the hemicellulose. The lignocellulosic material formed was mixed with hot water and stirred for a while. Subsequently, solid-liquid separation was performed on an Outotec Larox PF 0.1 pressure filter as described in Table 2. The filtration area was 0.1 m2. The wash water was 1: 1 (water: cake insoluble solids) and 3: 1. The original pre-treated biomass had a dry solids content of 65%, a first filtration solids content of 16%, and a water-insoluble solids content of 13%. The water-insoluble solids content was kept constant in the filter press while the slurry solids increased due to the increased soluble material in the slurry. The washed cake contained about 50% dry matter. The composition of the solid fraction, which was additionally washed in the laboratory in the same manner as in the gravimetric washing method to remove any water soluble material, is shown in Table 5. The solid fraction was washed with water to remove residual soluble compounds, and properties were then determined.

The increase in concentration was simulated so that the whole process wash filtrate (12) and some of the first pressurized soluble carbohydrate filtrate (10) were counted for use as the next round dilution water, and after the second filtration, the wash filtrate and . For 1: 1 wash, about 83% of the diluent was soluble carbohydrate filtrate, and for 3: 1 wash, 48% of the diluent was soluble carbohydrate filtrate. The washing efficiency was calculated to be 83% (1: 1) and 88% (3: 1). In the end, more than 70 iterations were performed. The simulation of the example was performed with a measured solubility of 18.4% in the pretreated lignocellulosic material. The concentration of soluble filtrate from the process reaches a level of 135 g / l in continuous 1: 1 wash and 99 g / 1 in 3: 1 wash.

Table 5

Example 13 In this example, a fraction of soluble carbohydrates and a solid fraction are produced.

Eucalyptus wood chips were pretreated in a one-step autohydrolysis and steam blasting process under two different process conditions to dissolve hemicellulose. The formed pretreated lignocellulosic materials were washed with hot water in a laboratory to remove most of the water-soluble compounds. These remaining water-soluble non-solids solids were measured on two different particle size analyzers. The results of Metso FS5 and Coulter LS230 are shown in Table 6 'Two water-insoluble solids of pre-treated eucalyptus-based ligno-cellulosic materials'.

Table 6

The process of the present invention is applicable in various embodiments for use in the production of a wide variety of sugar-based fractions from a variety of raw materials.

The invention is not limited to the example described above, but many variations are possible within the scope of the inventive idea defined in the claims.

Claims (8)

SUGGESTIONS T A solid fraction comprising solids (11) consisting of a lignocellulosic material (3) formed from a plant-based raw material (1), wherein the solid fraction comprises C 6 solid carbohydrates, other solid carbohydrates and lignin. The solid fraction according to claim 1, wherein the solid fraction comprises C6 carbohydrates which are C6H12O6 and / or C6 (H2O) n. The solid fraction according to claim 1 or 2, wherein the solid fraction contains less than 15% by weight of soluble compounds after the solid-liquid separator (4.6). The solid fraction according to any one of claims 1-3, wherein the solid fraction contains soluble compounds after less than 6% by weight of the solid-liquid separator (4.6). The solid fraction according to any one of claims 1-4, wherein the solid fraction contains less than 3% by weight of soluble compounds after the solid-liquid separator (4.6). The solid fraction according to any one of claims 1-5, wherein the solid fraction comprises fine solid particles having a longest dimension less than 0.2 mm. The solid fraction according to any one of claims 1-6, wherein the solid fraction is obtainable by a process comprising the steps of: separating from the lignocellulosic material (3) the soluble carbohydrate fraction (10) and / or the washing filtrate (12) by at least one solid-liquid separator (4,6) and recycling at least a portion of the soluble carbohydrate-containing fraction (10) and / or wash filtrate (12) to the lignocellulosic material (3), and recovering the solids (11) from the separating portion. The solid fraction according to any one of claims 1-7, wherein the solid fraction is the starting material for hydrolysis, the starting material for the composite material, or the starting material for the combustion process.