225results about "Pretreatment with acid reacting compounds" patented technology

The invention relates to a pretreatment method of wood fiber raw materials, which belongs to the technical field of biomass chemical engineering. The process comprises the following steps: carrying out the first-step treatment after the wood fiber raw materials are mixed with mixed liquid of an organic acid solution and catalysts to obtain a liquid-solid mixture; separating the obtained liquid-solid mixture to obtain pretreatment black liquid and cellulose solids; washing the obtained cellulose solids by the organic acid solution to obtain washing black liquid and cellulose solids; adopting diluted acid or alkali for carrying out the second-step treatment on the obtained cellulose solids; mixing the obtained pretreatment black liquid and the obtained black liquid to obtain mixed black liquid; circularly using the mixed black liquid in the first-step treatment process; and recovering organic acids, lignin products and syrup solutions from the black liquid in the cyclic use for at least three times. The invention has the advantages that the full-rate development of raw materials can be realized, in addition, the environment-friendly effect can be realized, and the invention conforms to the requirement of modern biorefinery development.

A method for fractionating fibrous biomass comprising cellulose, hemicellulose and lignin components to separate said lignin, cellulose and hemicellulose from one another comprises: (a) shredding said fibrous biomass; (b) concurrently with or subsequent to said shredding, contacting said biomass with an aqueous solution of a nitrate ion source at a concentration of about 0.1-0.3% at a temperature in the range of about 60° to about 80° C. to initiate nitration of the lignin component of said biomass; (c) submerging said partially nitrated biomass in an aqueous solution of a nitrate ion source in the presence of an aluminum compound at a temperature within the range of about 75-100° C. for a time sufficient to complete the nitration of said lignin component; (d) contacting the nitrated biomass produced in step (c) with an alkaline extraction liquor comprising NH4OH at an initial concentration sufficient to solubilize said nitrated lignin component and said hemicellulose component from said cellulose component of said biomass; e) recovering said cellulose from said extraction liquor containing said solubilized nitrated lignin and hemicellulose components, wherein said cellulose comprises at least about 88% alpha cellulose; (f) treating said extraction liquor with an acid to precipitate lignin contained therein, and (g) separating said lignin from soluble hemicellulose in said extraction liquor. The recovered cellulose component comprises at least 88% alpha cellulose and is useful as a starting material for the production of ethanol.

The invention provides for methods for producing pulp (comprising cellulose) and lignin from lignocellulosic material, such as wood chips. The methods involve acid catalyzed hydrolysis. Lignocellulosic material having a relatively high moisture concentration can be used as the starting material. The lignocellulosic material is impregnated with an acid (preferably nitric acid) and heated. During the heating lignin is depolymerized at relatively low temperatures, and the acid catalyst is distilled off. The acid catalyst can be collected and recycled after impregnation and heating. The lignocellulosic material is then digested in an alkaline solution under heat, dissolving the lignin and allowing the pulp to be removed. Acid is added to the black liquor to precipitate the lignin which is then removed. The resultant amber liquor can be further processed into other ancillary products such as alcohols and/or unicellular proteins.

The present invention generally relates to processes for production of ethanol from cellulosic biomass. The present invention also relates to production of various co-products of preparation of ethanol from cellulosic biomass. The present invention further relates to improvements in one or more aspects of preparation of ethanol from cellulosic biomass including, for example, improved methods for cleaning biomass feedstocks, improved acid impregnation, and improved steam treatment, or “steam explosion.”

The present invention relates to a process for the production of xylose and dissolving pulp from xylan-containing biomass, such as hardwood. The invention is based on prehydrolysis of the xylan-containing biomass with SO₂ in specified conditions, followed by chromatographic fractionation, nanofiltration or precipitation crystallization of the xylose-containing prehydrolyzate to obtain a xylose product having a xylose content of at least 55% on DS. The dissolving pulp obtained from the process can be used for example for the production of viscose.

A method and apparatus for fractionating a lignocellulose-based biomass are provided. The method includes providing a lignocellulose-based biomass, extracting lignin from the biomass by adding a first solvent capable of dissolving the lignin, extracting xylose by adding a second solvent capable of dissolving hemicellulose to the biomass treated with the first solvent, and extracting the cellulose remaining in the biomass. In this method, a continuous process can be performed instead of a low efficiency batch-type process and components of the biomass can be obtained at high yield.

The present invention relates to a clean process of preparing high grade biomass products, and their use in the production of health care products, bio-energy products, biochemicals, bio-originated chemicals and biodegradable plastics.

An organic material production system using biomass material includes: a hydrothermal decomposition apparatus (13) that causes the biomass material (11) and hot compressed water (12) to countercurrently contact with each other and undergo hydrothermal decomposition, and that transfers a lignin component and a hemicellulose component into the hot compressed water, so as to separate the lignin component and the hemicellulose component from a biomass solid residue; a cellulose enzymatic saccharification device (17) that treats, with an enzyme, cellulose in the biomass solid residue, so as to enzymatically saccharify the cellulose to a first sugar solution containing hexose; an alcohol fermenter (18) that produces alcohols by fermentation using the obtained first sugar solution; a sulfuric acid decomposition device (33) that decomposes, with sulfuric acid, the hemicellulose component in hot water (30) discharged from the hydrothermal decomposition apparatus, which contains the eluted lignin component and the eluted hemicellulose component, so as to decompose the hemicellulose component to a second sugar solution containing pentose; and a second alcohol fermenter (34) that produces, using the second sugar solution containing pentose, alcohols by fermentation.

The invention discloses short linen viscose fiber and a preparation method thereof. The viscose fiber is produced by preparing linen pulp from linen and then using the linen pulp. The preparation method comprises the following steps of: pre-processing, washing, digesting, washing, pulping, degritting, concentrating, alkali refining, whitening, performing acid treatment, washing, finely selecting, degritting, concentrating, papermaking, soaking, squeezing, smashing, aging, yellowing, grinding, dissolving, filtering, defoaming, filtering, spinning, drafting, cutting off, performing post treatment, drying, packaging and the like. The preparation method has the advantages that: the performance of bacterial resistance and bacterial resistance of the linen fiber can be kept better, a finished product has high whiteness, the production period is short, the problems of large digesting intensity, complicated digesting process and the like are solved, and the pollution generated during production is low.

The invention relates to a method for preparing bagasse dissolving pulp and pre-extracting hemicellulose and products thereof; the method comprises the following steps: bagasse preparation which comprises the steps of depithing and washing; prehydrolysis which is carried out in a globe digester or a hydrolysis boiler; wherein, the process conditions are as follows: in the process for depithing and oven-drying bagasse, the solid-to-liquid ratio is 1:0.4-8.0, the hydrolysis temperature is 100-200 DEG C, the hydrolysis time is 15-240min, the pH value of the end point of hydrolysis is 2-5; in the process of the solid-to-liquid separation and washing, the filtrate is collected to prepare extracting solution; dissolving pulp is prepared by residue alkali method. By adopting the method, bagasse dissolving pulp and bagasse extracting solution which is used to prepare oligosaccharides are obtained. Most of pentosan in bagasse can be extracted by controlling the process conditions of the prehydrolysis, the technical route and the process conditions have strong pertinence so that the reactivity and the uniformity of bagasse dissolving pulp can be improved; by improving the traditional dissolving pulp alkali method for pulping, bagasse biorefinery based on dissolving pulp pulping can be realized in engineering so that the production costs for preparing bagasse dissolving pulp and pre-extracting hemicellulose are reduced.

A method for pretreating a biomass, in which a water-reactive anhydride contacts a biomass, is disclosed. The biomass is pretreated using internal heating by an exothermic reaction. Further, an apparatus for pretreating a biomass having a reaction part including an inlet part and an outlet part for the water-reactive anhydride is disclosed.

The invention relates to a method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process, which comprises the following steps of: bamboo material preparation, in which bamboo is made into bamboo sheets and bamboo threads, the bamboo sheets and threads are washed to remove impurities and dust; pretreatment, which is for removing more organic and nonorganic impurities, and in which the loss of pentosan is less than 2 percent; prehydrolysis, which is carried out at an acid concentration of sulphuric acid and hydrochloric acid of 0.1 to 10.0 weight percent, a temperature of between 80 and 14 DEG C and a liquor ratio of 1:4-15 for 30 to 400 minutes; and alkaline process. The method has the advantages that: the performance index of the bamboo dissolving pulp meets the requirements of viscose fibre pulp and the like; the improved prehydrolysis process allows the major part of pentosan in the bamboo to be hydrolyzed; the hydrolysate can be used as a raw material for xylose, xylitol, L-Arabinitol, ethanol and other products; the improved prehydrolysis process lays a good foundation for cooking and improving the reaction performance of the dissolving pulp; little production cost is added, the treatment load and cost of waste are reduced with the recovery of the products of the prehydrolysis, and the comprehensive cost is the lowest; and the comprehensive utilization of the components of biomass is realized during the pulping process of the dissolving pump.

A continuous process for treating a lignocellulosic feedstock is provided. This method comprises pretreating the lignocellulosic feedstock under pressure in a pretreatment reactor at a pH between about 0.4 and about 2.0. One or more than one soluble base is added to this pressurized, pretreated feedstock after it exits the pretreatment reactor to adjust the pretreated lignocellulosic feedstock to an intermediate pH of between about pH 2.5 to about pH 3.5. This pressurized, partially-neutralized feedstock is then further processed at the intermediate pH. This may include flashing one or more than one time at the intermediate pH. The pH of the pressurized, partially-neutralized feedstock may then be adjusted with one or more than one base to produce a neutralized feedstock having a pH between about 4 and about 6. Prior to adjusting the pH to between about 2.5 and about 3.5, the pressurized, pretreated feedstock may be partially depressurized.

A method of pretreating comminuted fibrous material with sodium carbonate and then cooking the pretreated material in the presence of anthraquinone (AQ) is provided. The resulting pulp produced has a higher yield, enhanced strength, and better bleachability compared to pulp produced by prior art methods. AQ may also be introduced to the carbonate pretreatment stage. The method may further include an acid pretreatment providing further enhanced properties to the pulp produced.

A process is disclosed for pretreating lignocellulosic biomass. The process comprises swelling the lignocellulosic biomass with an aqueous liquid. The pretreated lignocellulosic biomass may be used as a feedstock for the enzymatic conversion to ethanol, or in a thermal conversion process to produce bio-oil. The pretreatment results in a greater yield and, in the case of a thermal conversion process, a better quality of the bio-oil.

The pretreatment process may be used to adjust the composition and amount of inorganic material present in the lignocellulosic biomass material.

The present invention provides a preparation method of bamboo pulp, belonging to the field of chemical fiber technology. Said method includes the following steps: obliquely cutting bamboo strip material into the form of horseshoe, the chip cross-section spacing distance is 20-40 mm, then prehydrolyzing the prepared bamboo strip, adding alkali and cooking, removing sand, making one-stage or two-stage bleaching treatment, making the bleached pulp material undergo the processes of acid treatment, concentration and pulping so as to obtain the invented bamboo pulp. Said bamboo pulp can be used for producing viscose fibre.

A selective removal of metal and its anion species that are detrimental to subsequent hydrothermal hydrocatalytic conversion from the biomass feed prior to carrying out catalytic hydrogenation/hydrogenolysis/hydrodeoxygenation of the biomass in a manner that does not reduce the effectiveness of the hydrothermal hydrocatalytic treatment while minimizing the amount of water used in the process is provided.

This invention is directed to a process for treating biomass. The biomass is treated with a biomass swelling agent within the vessel to swell or rupture at least a portion of the biomass. A portion of the swelling agent is removed from a first end of the vessel following the treatment. Then steam is introduced into a second end of the vessel different from the first end to further remove swelling agent from the vessel in such a manner that the swelling agent exits the vessel at a relatively low water content.

The invention relates to a bagasse alkaline pulping method by pre-extracting hemicellulose and a product thereof; the method includes the following steps of: preparing bagasse: depithing and washing the bagasse; pre-extraction, in which the extracted solvent is sodium hydroxide solution and the technical condition comprises an alkaline content of 1-8percent, a solid-to-liquid ratio of 1:2.5-8.0, extraction temperature of 80-180 DEG C, heating-up time of 10-120 minutes, holding time of 0-120 minutes, a pH value of 4.5-6.9 at a reaction end point, and the pressure of saturated steam pressure at corresponding temperature; liquid solid separation and washing: collecting filtrate to produce extract; and preparing the pulp by residue alkaline process. In the invention, bagasse extract capable of extracting xyio-oligosacchandes, and the like and bagasse rough pulp for preparing whitened chemical pulp can be obtained; with a pre-extraction procedure added before stewing, the unscreened yield and hardness of bagasse are equivalent to that of pure pulping without pre-extraction by controlling the pre-extraction and stewing technical condition; bagasse biological refining on a pulping basis is realized; and the cost for pulping and pre-extracting hemicellulose is reduced, thereby saving resources.