1262 results about "Xylooligosaccharide" patented technology

The invention relates to a continuous reaction process flow for producing ethylene glycol and 1, 2-propylene glycol through continuous hydrocrackin of sugars and provides a method for producing the ethylene glycol and the 1,2-propylene glycol through continuous hydrocrackin of sugars. In the process flow, sugars (comprising one or more than two of sugar, glucose, fructose, xylose, soluble xylo-oligosaccharide and starch) are hydrocracked in the presence of a catalyst in a reactor and the hydrocracked product enters a separating system. Hydrogen gas in a gas phase is recycled by separating and recovering; a liquid phase product partially reflows to the reactor and other liquid phase products are refined and separated to form the ethylene glycol, the propylene glycol and other polyhydric alcohols; and concentrated soluble catalyst components in the refined and separated residual component liquid phase are partially returned to the reactor.

The present invention discloses a fruit and vegetable soybean milk drink which is prepared from the following raw materials in parts by weight: fruit juice 10-15 parts, vegetable juice 5-10 parts, Chinese red date soybean milk 3-5 parts, white granulated sugar 3-5 parts, high glucose syrup 2-3 parts, xylo-oligosaccharide 1-2 parts, malic acid 2-5 parts, citric acid 0.1-0.2 part, stabilizer 0.1-0.15 part and pure water 77.15-87.3 parts. The preparation method of the fruit and vegetable soybean milk drink comprises the following steps: (1) preparing the fruit juice; (2) preparing the vegetable juice; (3) preparing the Chinese red date soybean milk; (4) blending; (5) homogenizing and degassing; and (6) sterilizing and bottling. The prepared fruit and vegetable soybean milk drink increases the taste, improves the mouthfeel, maintains the nutritional values and increases the nutrients of the soybean milk, not only satisfies the people's pursuit for taste preferences, but also maintains and adds more nutrients, and has higher nutritional values.

The invention discloses a comprehensive utilization process of wood cellulose, which comprises the processes of comprehensive treatment, oligosaccharide preparation, lignin preparation, fiber ethanol preparation and the like. The invention has the advantages of decomposing a biomass macromolecular natural compact structure by using a high-pressure instant steam exploding technology, being beneficial to the separation and the extraction of the lignin, the cellulose and the cellulose, reducing the consumption of the energy sources and the materials, such as acid, alkali, heat, catalyst and the like for preprocessing, reducing the emission of pollutants and lightening the pollution of the environment. Secondly, the cogeneration of oligosaccharide and lignin realizes the comprehensive utilization of the energy sources, especially the application of the steam exploding technology ensures that the quality of the two products of the oligosaccharide and the lignin is greatly improved and the yield is greatly increased; and alcohol and the lignin of production fuels of sugar residues can be extracted irrespective of the order.

The invention provides a method for preparing ethylene glycol and 1,2-propylene glycol by using a high-concentration saccharide solution. Reaction raw materials comprise cane sugar, glucose, fructose, fructosan, xylose, soluble lower polyxylose and soluble starch. According to the method, high-concentration saccharide is used as a reaction raw material, and a high-pressure pump feeding mode is used in a reaction process which is performed in a high-pressure reaction kettle; iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum which serve as transition metal in eighth, ninth and tenth groups are used as hydrogenation active ingredients; the hydrogenation active ingredients form a composite catalyst together with metal tungsten, tungsten carbide, tungsten nitride, tungsten phosphide, tungsten oxide, tungsten sulfide, tungsten chloride, tungsten hydroxide, tungsten bronze, tungstic acid, tungstate, metatungstic acid, metatungstate, paratungstic acid, paratungstate, peroxotungstic acid, peroxotungstate and tungsten-containing heteropolyacid which serve as catalytic active ingredients; and the high-concentration saccharide solution can be efficiently prepared into the ethylene glycol and the propylene glycol at high selectivity and high yield in a one-step catalytic conversion process under the hydrothermal condition that the temperature is 120 to 300 DEG C and the hydrogen pressure is 1 to 13MPa. By the method, the problem of coking of the high-concentration saccharide in the catalytic conversion process can be effectively solved, and high-concentration ethylene glycol and propylene glycol can be prepared by the high-concentration saccharide.

The invention relates to a preparation method of a biological preservative. As known to all, along with the rapid development of the society, chemical preservatives have been used in food, have strong impact on food safety and endanger the health of consumers, therefore, the use of preservatives causes great concern of government departments and consumers. According to the biological preservative, natural plants and microbial antibiotic substances are used as base materials, for example, the biological preservative is prepared by mixture of carboxymethyl chitosan, xylooligosaccharide, nisin from lactic streptococci, acetic acid, lactobacillus reuteri, pediococcus acidilactici, calcium citrate, ionized calcium, lactic acid, plant essential oil and water. The biological preservative can inhibit growth of harmful microorganisms by antagonistic and competitive inhibition effects among different microorganisms and produce extracted and separated components of antibacterial active ingredients having antifungal and antibacterial functions in normal growth and metabolism processes, thereby achieving antiseptic and fresh-keeping effects.

To provide a high-purity xylooligosaccharide composition while preventing the formation of UV-absorbing substances and coloring matters.A high-pure xylooligosaccharide composition containing reduced UV-absorbing substances and reduced coloring matters and a method of producing the same which comprises alkali-treating or pressure- and heat-treating a plant material such as wood, corn cob, cotton seed hull, bagasse or rice straw, further enzymatically treating the same, and purifying the crude saccharide solution containing the residues thus obtained, wherein the solution is concentrated and then optionally subjected to desalting and active carbon-treatment. According to the method of the invention, the saccharified solution is concentrated followed by the desalting and active-carbon treating so that a high-purity xylooligosaccharide composition can be produced while preventing the formation of UV-absorbing substances and coloring matters.

The invention relates to a process for producing furfural from xylose comprising: (a) mixing an aqueous xylose solution containing xylose oligosaccharides with sub-critical or near-critical water to form a mixture at a first temperature and a first pressure; (b) maintaining the mixture at the first temperature and the first pressure for a first time period; and (c) rapidly cooling the mixture to a second temperature and a second pressure, wherein furfural is produced by the process (d) process can also be carried out with or without mixing of carbon dioxide with aqueous xylose solution before it is mixed with sub-critical or near-critical water to form a mixture at a first temperature and pressure.

The invention discloses a meal replacement protein powder solid beverage for managing the body weight and belongs to the field of nutrient foods. The solid beverage comprises the following components of soybean isolated protein, dried skim milk, whey protein concentrate, resistant dextrin, inulin, L-carnitine, a white kidney bean extract, a guarana extract, soy dietary fiber powder, pea fiber, oat fiber, erythritol, stevioside, phospholipid, Arabic gum, xanthan gum, pectin, alkalized cocoa powder, xylooligosaccharide and edible essence. By comprehensively considering the difference of nutrient components required by a human body at daytime and nighttime, the solid beverage disclosed by the invention is reasonable in formula matching and balanced in nutrition, and is the meal replacement solid beverage for supplementing the nutrients of the human body and controlling the body weight; the production process is simple and the drying is avoided; the damage to plant extracts and other components is prevented, so that the effects of nutrient components are guaranteed; besides, no sugar is added in the formula of the meal replacement protein powder solid beverage, so that the meal replacement protein powder solid beverage is suitable for being eaten by people with diabetes.

The invention provides a comprehensive utilization method of corn cob, which effectively separates hemicellulose, lignin and cellulose contained in a reproducible biological resource of corn cob in a reasonable process order at low cost and high efficiency, and makes full use of every type of biomass components, thereby solving the problem of utilization of residue in the biomass refining process of preparing ethanol and butanol by extracting xyio-oligosacchandes and enzymolysis from the corn cob in the prior art, and making reasonable and effective use of main components of biomass contained in the corn cob; particularly, the lignin can substitute partial petrochemical materials to prepare modified high-molecular materials, thereby reducing the cost of high-molecular materials and saving the energy consumption of petrochemical materials to bring great social benefit; in addition, the comprehensive utilization method of corn cob is featured by simple processing technique, easy implementation and favorable effect.

The invention relates to a lignocellulose acid / alkali coupling pretreatment method. Lignocellulose is separated into cellulose, hemicellulose and lignin by acid / alkali coupling pretreatment; and simultaneously, lignocellulose components are separated and subjected to high-efficiency enzymolysis and saccharification. The method comprises the steps of lignocellulose pretreatment, component separation, cellulose enzymolysis, solvent recovery and the like. The lignocellulose material is pretreated by formic acid or dilute sulphuric acid and is then subjected to solid-liquid separation, wherein the liquid component is used for recovering hemicellulose hydrolyzed sugar and part of lignin; and the solid component is further treated by ammonia water or a sodium hydroxide solution and is then subjected to solid-liquid separation, the liquid component is used for recovering lignin, and the solid component (cellulose) is subjected to enzymolysis and saccharification. By converting the lignocellulose into cellulose hydrolyzed sugar (glucose), hemicellulose hydrolyzed sugar (xylose and xylooligosaccharide) and lignin, the invention provides a basis for full-biomass utilization and develops a green process route for recovering the pretreatment solvent.

The invention relates to a nutritive defatting food. The nutritive defatting food comprises the following components of whey protein concentrate, hydrolyzed fish collagen protein, soy protein isolate,rice protein, inulin, psyllium husk, resistant dextrin, resistant starch, chenopodium quinoa willd, konjaku flour, chia seeds, fructo-oligosaccharide, xylooligosaccharide, isomaltulose, erythrite, steviosides, linseeds, linseed oil, CMC, medium chain triglyceride, conjugated linoleic acid glycerides, L-carnitine, ferment, complex vitamins, and composite mineral substances. The nutritive defattingfood is good in satiety, balanced in nutrients, and good in defatting effect.

The invention discloses grading and separating of all components of forestry cellulose biomass and preparing of fuel alcohol and xylo-oligosaccharide by utilizing the separated components. The method comprises the following steps of: (a) crushing, immersing and filter pressing dry substances of the forestry cellulose biomass; (b) immersing the filter pressed solid phase part using an alkaline solution, adding an oxidizing agent, extracting and solidifying phase to form a cellulose crude product; (c) concentrating pressure filtrate through a nano-filtration membrane, adding alcohol with the final concentration of above 50% to the concentrated solution, filtering or centrifugally separating after standing to obtain precipitate and supernatant, wherein the precipitate is a hemi-cellulose crude product; and (d) adjusting the supernatant obtained in the step (c) to be acid, and filtering, separating and precipitating to obtain a lignin crude product. According to the method disclosed by the invention, the resource utilization is maximized; the independence on imported oil in our country can be reduced; the environment pollution is reduced; establishment of a new energy industry and a biological chemical industry can also be promoted; the economic growth pattern in our country is changed; and social and economic sustainable development can be realized.

A method for using biomass to produce cellulose, lignin and wood sugar comprises that breaking and screening the biomass, using low-boiling-point organic acid to immerge to decompose the biomass into wood sugar and oligosaccharide, and fluidize the cellulose and lignin, cools the liquid biomass after reaction, adds organic solvent, mixes uniformly and lays, after deposits completely, separating deposits and washes, dries to obtain non-shaped cellulose, distills the mother liquid of cellulose, recycles organic acid and generated volatile organics, distills mother liquid, cools and lays until complete deposition, separates deposits, washes, and dries to obtain wood sugar and oligosaccharide, evaporates to recycle the wood sugar and the organic solvent of deposited mother liquid, then separates the deposits, and dries to obtain lignin. The invention can completely circulate organic acid and organic solvent without waste discharged.

The present invention relates to a reaction apparatus for preparing a low carbon polyol by catalysis and conversion of a carbohydrate, and a reaction process thereof. The reaction process adopts a high pressure reactor, wherein a catalyst filtering gondola is positioned inside the high pressure reactor, the position of the gondola is higher than the liquid level of the reactant inside the reactor, and the reaction is carried out under a high temperature hydrothermal condition. During the reaction, reactant slurry of the carbohydrate (comprising one or more than two materials selected from cellulose, hemicellulose, sucrose, glucose, fructose, xylose, soluble xylooligosaccharide and starch) flows from the bottom of the reactor, is driven to flow back to the reactor by a high pressure liquid pump, then is injected into the gondola to perform a catalytic reaction with the catalyst inside the gondola, and flows and accumulates on the bottom of the reactor, and the reaction is circulated. With the process, catalyst poisoning and deactivation can be effectively reduced, such that the reaction selectivity and the catalyst life can be improved.

The invention discloses a probiotic solid drink with a hypoglycaemic effect and a preparation method of the probiotic solid drink. The probiotic solid drink comprises components in percentage by weight as follows: 5%-15% of complex probiotics, 14%-28% of xylooligosaccharide, 50%-80% of L-arabinose and 4%-6% of dietary fiber. Complex probiotic powder contains lactobacillus rhamnosus, lactobacillus reuteri and bifidobacterium adolescentis. With the adoption of the probiotic solid drink, a large quantity of probiotics can be proliferated, the colonization rate and survival rate of exogenous probiotics on the intestinal mucosa are increased, a balanced system of intestinal flora is improved, immunity of a human body is improved, an organism is promoted to repair various functions, so that the auxiliary hypoglycaemic effect is realized. With the adoption of a dry blending technology, nutrient substances with different characteristics are subjected to optimizing and compounding combination, so that the problems of need for refrigeration, short guarantee period, single flora constitution, low viable counts and the like of a conventional liquid probiotic drink are solved, and the market prospect of products is broad.

The invention discloses a blueberry composite tablet candy capable of relieving visual fatigue and a preparation method thereof. The blueberry composite tablet candy capable of relieving the visual fatigue comprises the following raw materials in percentage by weight: 13.25 percent of a blueberry extract, 0.5 percent of lutein esters, 0.3 percent of beta-carotene, 1.0 percent of citric acid, 64.45 percent of sorbitol, 2 percent of xylooligosaccharide, 3 percent of dextrin and 15 percent of microcrystalline cellulose, wherein the blueberry extract is extracted from a mixture of blackberry pomace dry matter and acid ethanol; the acid ethanol comprises ethanol and water with the volume percentage of 60 percent; the pH value of the acid ethanol is 1.5 to 3.0; the blackberry pomace dry matter and the acid ethanol are in the mass volume ratio of 1:50-1:70; the preparation method of the blueberry composite tablet candy capable of relieving the visual fatigue comprises the following main steps: 1, preparing the blueberry extract; 2, crushing; 3, mixing; 4, granulating; 5, tabletting; 6 packaging. The blueberry composite tablet candy capable of relieving the visual fatigue can effectively relieve the visual fatigue, can improve eyesight after long-term eating, and is convenient to take; a new using way is provided for utilizing fresh blueberry and fully playing intentional physiological and pharmacological efficacies.

The invention relates to a continuous reaction process for producing ethylene glycol and 1,2-propanediol by catalytic hydrocracking sugar conversion, and provides a method for producing ethylene glycol and 1,2-propanediol by continuous hydrogenation cracking sugar conversion. During this process, sugars (including one or more of sucrose, glucose, fructose, xylose, soluble xylooligosaccharides, and starch) are hydrocracked by catalysts in the reactor and then enter the separation system. The hydrogen in the gas phase is separated and recovered for recycling; part of the liquid phase product is returned to the reactor, and the rest of the liquid phase product is refined to separate ethylene glycol, propylene glycol, and other polyols; it exists in the remaining heavy components after refining and separation. Concentrate in the liquid phase The soluble catalyst components are partially recycled back to the reactor.

The invention relates to a method for preparing xylo-oligosaccharides by utilizing extrusion-assisted enzymatic hydrolysis of wheat bran, and specifically belongs to the technical fields of agricultural and sideline product development, functional food additives and nutritional health care. It mainly uses wheat bran as raw material. After crushing, enzymatic decomposition is used to remove starch and protein to prepare wheat bran dietary fiber. After passing through a twin-screw extruder, Bacillus subtilis xylanase is used for enzymatic hydrolysis reaction to determine the extrusion rate. Pressure and enzymatic hydrolysis process conditions; the enzymatic hydrolysis supernatant is concentrated and dried to prepare xylo-oligosaccharides. The yield rate of xylo-oligosaccharides of the present invention is 11% (calculated based on wheat bran), the purity of xylo-oligosaccharides exceeds 70%, and the content of xylobiose, xylotriose and xylotetraose is more than 50%; wheat can be realized Effective value addition and utilization of bran, the prepared xylo-oligosaccharides have high purity, excellent biological activity, good bifidobacteria proliferation effect, low heat performance and good surface activity.

A process for extracting xylan from wooden fibre material features that under the catalysis of microwave, the alkali solution containing hydrogen peroxide in directly sued to treat raw material for performing extraction of xylane and bleaching it at same time. Its advantages are high speed, less consumption of alkali, and high extracting rate. The resultant xylan solution can be deposited in organic solvent or superfilted and dried to obtain light-color xylan product.

The invention relates to a clean and high-efficiency production process for preparing xylose and L-arabinose and belongs to the field of application of wastes of agriculture and forestry. The production process comprises the following steps of: performing pretreatment on raw materials; hydrolyzing the raw materials in a high-temperature cooking mode; performing neutralizing treatment and performing centrifugal separation on solid slag to obtain xylose or xylooligosaccharide hydrolyzate; adding coarse enzyme solution into xylooligosaccharide solution to hydrolyze to obtain xylose solution; treating the hydrolyzate by Angle yeast; purifying by using active carbon and resin; performing recompression and concentration treatment on the purified hydrolyzate by using a mechanical vapor recompression (MVR) machine; crystallizing the concentrated solution in a gradient program cooling mode to obtain xylose products and xylose mother solution; separating the xylose mother solution by a simulated moving bed or a chromatographic separation technology to obtain a xylose phase and an L-arabinose phase; returning the xylose phase to the xylose solution to concentrate and recrystallize; reusing the xylose mother solution; performing MOVR concentration treatment on the L-arabinose phase and crystallizing in a gradient program cooling mode to obtain L-arabinose products; and reusing the L-arabinose mother solution.

A high-purity oligoxylose is prepared from corn cob through pretreating by diluted acid, digestion, enzymolyzing by xylanase, refining, ultrafiltering, and nano filtering. Its advantages are high purity (90%) and low cost.

The invention discloses a method for preparing xylooligosaccharide, lignin and microcrystalline cellulose by completely utilizing straws, belonging to the technical fields of food and chemical engineering. The method comprises the following steps: by using straws of wheat, rice, corn and other agricultural crops as raw materials, pulverizing, soaking in water, carrying out certain-intensity steam explosion depolymerization treatment, adding xylanase for enzymolysis, filtering, and carrying out membrane separation on the filtrate to obtain the xylooligosaccharide; carrying out certain-intensity steam explosion treatment on the filtration residue, adding cellulase and laccase for enzymolysis, filtering, carrying out high-pressure value equalizing on the filtrate, decolorizing, concentrating and drying to obtain the microcrystalline cellulose; and immersing the filtration residue in a solution with a certain pH value, reacting at specific temperature, carrying out vacuum filtration under reduced pressure, carrying out solid-liquid separation, and drying to obtain the refined lignin. By adopting the steam explosion and composite enzymolysis, the method has the advantage of mild conditions, avoids using toxic reagents, and implements complete utilization of the hemicellulose, cellulose and lignin components in the straws.

Xylooligosaccharide is produced from a lignocellulose pulp by enzyme-treating a lignocellulose pulp with hemicellulase, filtering the resultant reaction mixture to separate a liquid fraction from the enzyme-treated pulp, subjecting the separated liquid fraction to a permeation treatment through a separation membrane to separate a non-permeated fraction containing xylooligosaccharide-lignin complex with an increased concentration from a permeated fraction, collecting the non-permeated fraction, and separating and recovering xylooligosaccharide from the collected non-permeated fraction.

The invention discloses a bio-preparation method for production of high-purity xylo-oligosaccharide and coproduction of arabinose and xylose. The method comprises the following steps of: washing hemicellulose-enriched biomass, performing size mixing pretreatment, adding xylanase, performing enzymolysis, and separating and purifying to obtain mixed liquid glucose; concentrating the mixed liquid glucose until the mass concentration is 50 to 70 percent, and performing chromatographic separation to sequentially obtain AD phase, BD phase, CD phase and BD phase, and concentrating the BD phase to obtain a high-purity xylo-oligosaccharide syrup liquid product; concentrating the CD phase, mixing with cellulosic materials, drying, and crushing to prepare fiber feed; performing yeast fermentation on the AD phase to remove glucose, removing impurities, purifying, concentrating and performing chromatographic separation to obtain the high-purity xylose liquid and arabinose liquid; concentrating the xylose liquid, crystallizing, separating and drying to obtain crystallized xylose; and concentrating arabinose liquid, crystallizing, separating and drying to obtain crystallized arabinose. The invention also provides a bio-preparation method for arabinose and xylose.

The invention relates to a sterilization combination containing oligosaccharide and a methoxy acrylic ester ingredient. The methoxy acrylic ester ingredient is selected from one of trifloxystrobin, benzene kresoxim-methyl, SYP-1620, pyraclostrobin, metominostrobin, orysastrobin, picoxystrobin, coumoxystrobin and pyraoxystrobin or JS399-19. The oligosaccharide is selected from one of oligochitosan, sodium alginate oligosaccharide, pectin oligosaccharide, isomalt oligosaccharide, xylooligosaccharide or soybean oligosaccharides. Preferably, the weight ratio between the oligosaccharide and the methoxy acrylic ester ingredient is (9:1)-(1:99). The sterilization combination is remarkable in synergism, expands a control spectrum, reduces using cost and delays drug resistance.

The invention relates to a tablet candy containing prebiotics and a preparation method thereof. The tablet is prepared from the following components in parts by weight: 1-40 parts of isomaltooligosacharide, 1-20 parts of fructo-oligosaccharide, 1-30 parts of xylooligosaccharide, 5-30 parts of microcrystalline cellulose, 1-15 parts of citric acid, 5-30 parts of xylitol, 5-30 parts of skim milk powder and 0.1-3 parts of magnesium stearate. The tablet candy containing prebiotics is obtained through the steps of crushing all of the raw materials, respectively, filtering through an 80-mesh sieve, mixing evenly, forming a soft material, pelleting, drying, shaping and tableting. The tablet candy containing prebiotics provided by the invention is capable of promoting the multiplication of probiotics in the intestinal tract of the human body and then improving the intestinal environment of the human body, promoting intestinal tract movement, preventing constipation, reducing the multiplication of harmful bacteria, improving the immunity of the human body, promoting the synthesis of group B vitamins and also promoting the absorption of trace elements such as Ca, Fe and Zn.

The invention belongs to the technical field of comprehensive utilization of subsidiary agricultural products, and relates to a method for preparing xylooligosaccharide and cellulose by using a crop straw acid hydrolysis method. The method for preparing the xylooligosaccharide by using the crop straws is used for preparing the xylooligosaccharide by four steps of pretreatment, acid hydrolysis, decoloration and desalination for hydrolysate and concentration drying; and a cellulose product can be obtained by performing alkaline treatment, stewing, pulping and drying on solid residues produced in a xylooligosaccharide preparation process. According to the method for preparing the xylooligosaccharide and the cellulose by using the crop straw, the crop straw is used as a raw material; the xylooligosaccharide and the cellulose are prepared by hot water pretreatment and acid hydrolysis by using the agricultural forest byproducts; the production technology is simple; the practicability is high; the economical value of the product is improved; the difficulty in utilization of the straw is well solved.

The invention discloses a fruit, vegetable and Chinese herbal medicine composite enzyme, which is prepared from the following components in parts by weight: 100-200 parts of vegetable raw materials, 120-400 parts of fruit raw materials, 70-150 parts of Chinese herbal medicinal materials, 100-150 parts of a sweetening agent, 5-10 parts of xylooligosaccharide, 1-3 parts of microelements, 200-300 parts of distilled water and 10-20 parts of strains. Through compounding a vegetable enzyme, a fruit enzyme and a herb enzyme, the requirements of people can be basically met; through adding the microelements, the nutrients are more balanced, the enzyme is more diverse in function, more abundant in formula and safe to eat; through adding the sweetening agent and xylooligosaccharide, fermentation of high glucose is effectively avoided, the fruit, vegetable and Chinese herbal medicine composite enzyme can adapt to the requirements of more people, the phenomenon of over-high blood glucose of a user is effectively avoided, the requirements of a human body is benefited and the composite enzyme is beneficial to human health after being frequently eaten.

A composition composed of a Lactobacillus bacterium, Bifidobacterium longum, and xylooligosaccharide is provided for use in reducing uric acid levels in the blood and preventing or treating hyperuricemia or gout.

The invention discloses a method for preparing oligosaccharide and paper pulp, belonging to the technical fields of pulping and the comprehensive utilization of pulping. The method comprises the steps of: using crop straws as raw materials, pre-treating the raw materials to obtain a pre-extracting solution, concentrating the pre-extracting solution by a membrane separation method, then obtaining a crude xylan solution via precipitation and centrifugal separation, and then preparing oligosaccharide via enzymolysis, vacuum concentration and frozen-drying. The pre-treated solid residues are stewed via an alkaline process so as to prepare unbleached paper pulps of which the indexes such as fiber length, whiteness, fracture length, tear resistance, folding strength and the like are all improved. The generated black liquid has the characters of low viscosity and high heat productivity. The method for preparing oligosaccharide and paper pulp integrates the comprehensive utilization method with the biomass transformation method on the premise of optimizing the traditional alkaline chemical pulping technique to prepare products with high additional values, namely oligosaccharide, thereby increasing the quality of the paper pulp and the extraction, vaporization and combustion performances of the black liquid.