57 results about "Biorefinery" patented technology

Methods of making glucose and/or furfural from biomass require one or more supercritical fluids that may be used to process biomass, cellulose from the biomass, and/or xylose from the biomass. Examples of supercritical fluids for use in processing biomass include ethanol, water, and carbon dioxide at a temperature and pressure above the critical points for ethanol and carbon dioxide but at a temperature and/or pressure below that of the critical point for water. A supercritical fluid containing carbon dioxide and water may be used to convert cellulose to glucose or convert xylose to furfural. The fluid has a temperature and pressure above the critical point of carbon dioxide, but at least one of the temperature and pressure is below the critical point for water.

An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.

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.

The present invention generally provides methods of improving lignin separation during biomass fractionation with an acid to release sugars and a solvent for lignin (such as ethanol). In some embodiments, a digestor is employed to fractionating a feedstock in the presence of a solvent for lignin, sulfur dioxide, and water, to produce a liquor containing hemicellulose, cellulose-rich solids, and lignin. A solid additive is added to the digestor, wherein the solid additive combines with at least a portion of the lignin. Then a mixture of lignin and the solid additive is separated from the liquor, prior to hemicellulose recovery. Optionally, a solid additive may also be introduced to a hydrolysis reactor for converting hemicellulose oligomers to monomers, to improve separation of acid-catalyzed lignin. In some embodiments, the solid additive is gypsum or a gypsum/lignin mixture.

The present invention improves corn dry milling in several ways. Integrated corn biorefinery processes are disclosed which can produce ethanol, edible corn oil, DDGS, solvent-extracted meal, power, and optionally crude corn oil, starting from corn. Some variations employ corn fractionation and edible corn oil recovery using liquid carbon dioxide, avoiding hazardous hydrocarbon-based solvents to produce edible corn oil. Some variations employ integration of gas-fired co-generation into the dry-milled corn ethanol plant to significantly reduce energy usage and carbon footprint associated with the overall process. Counter-current drying is preferably employed to produce a high-quality DDGS product with high protein content, low mycotoxin content, and low residual ethanol content.

A method of making alkanes from lignocellulosic sources of C5 and C6 sugars. Suitable biomass feedstocks are converted into alkane-based fuels such as diesel and jet fuel blendstocks. Sugar monomers from the feedstocks are converted to chlormethylfurfural (CMF) with a levulinic acid (LA) byproduct. The CMF and LA are converted to ethyl levulinate (EL) and hydroxymethylfurfural (HMF), which are then combined into longer chain molecules via aldol condensation reactions. The condensation products are partially or fully saturated by mild hydrotreating, followed by deoxygenation to form alkanes with boiling ranges suitable for use as liquid fuels.

The invention relates to an efficient method for separating solid residue and products in lignocellulose fermented mash. The method comprises the specific steps of: (1) preparing a flocculant solution; (2) evenly mixing the lignocellulose fermented mash with a flocculant solution, and stirring for 5 min to fully contact the flocculant with the lignocellulose solid; and (3) conducting a solid-liquid separation on the mixed fermented mash by using a mill or a vacuum filtration device, so as to obtain a clear liquid containing fermentation products and lignocellulose solid residue. The invention has wide raw material resources, greatly reduces energy consumption of the solid-liquid separation in the condition of ensuring yield of effective products in the lignocellulose fermented mash, further improves the production process of fuel ethanol and bulk chemicals from biotransformation lignocellulose, and provides technical reserve for industrialization of lignocellulose biorefinery.

The invention provides a method for preprocessing lignocellulose raw materials for biorefinery and discloses a method for preprocessing raw materials for biorefinery. The method comprises the following steps of promoting stripping of acetyl on hemicellulose in a preprocessing process by use of a small amount of alkali, and neutralizing formed acetic acid; carrying out precorrection on an acid environment formed in a hydrothermal preprocessing process, destroying chemical bonds between the hemicellulose and lignin by utilizing a high-temperature liquid water environment, so as to change the existence state of cellulose. The preprocessing method can be used for effectively avoiding generation of degradation products sourced from the hemicellulose and the lignin in the preprocessing process, greatly improving the hemicellulose recovery rate, and meanwhile ensuring that enzymolysis of the cellulose and the hemicellulose is easy. The preprocessed biomass raw materials can be used for production of cellulosic ethanol, oligosaccharide, xylitol and high-quality lignin.

The invention relates to a pretreatment method for biorefinery of lignocellulose, comprising the following steps: preparing five carbon sugar and a small amount of six carbon sugar which are used for fermenting in the steps of enabling the raw material of lignocellulose to be subjected to the autocatalytic hydrolysis reaction at medium temperature for one time, filtering, washing and concentrating, and preparing lignose and cellulose in the steps of enabling the five carbon sugar and the six carbon sugar to be subjected to the basic carbonate catalytic degradation reaction, filtering, washing, reducing pressure and steaming. Because the carbonate is used as the catalyst, the lignose can be effectively removed from the biomass of the lignocellulose, the cellulose enzymolysis efficiency can be improved and the cellulosic ethanol production cost can be reduced. The method for preprocessing and biologically refining the lignocellulose can ensure that 90 percent of the five carbon sugar, more than 91 percent of lignose and more than 93 percent of cellulose can be recovered, and in addition, the method for preprocessing and biologically refining the lignocellulose has low cost, needs no strong base or strong acid and is simple and environmental friendly.

The invention discloses biochemical crude oil which mainly consists of biological oil and petroleum and/or alcohol ether fuel. In the invention, fossil petroleum is subversively replaced with a biomass from the raw material phase, so that an economic structure which does not depend on the fossil petroleum is established, and by ecological restoration of saline alkali and mineral waste lands, the greening of the heavy chemical industry is promoted simultaneously when biorefinery is developed; the biochemical crude oil is prepared by the existing petroleum production, refining and sale system or equipment of oil refining enterprises, chemical plants, clean fuel enterprises and the like; and the biochemical crude oil can be pumped and stored by a pump and is conveyed by a pipeline, a road, a railway and an oil tanker. Therefore, the original eliminated unenlightened or polluted productivity is converted into the productivity of a green oil field, a low sulphur oil refinery and a greening industry; the biochemical crude oil not only has little investment and low cost and is rapid to start; in the developing process, the environment is protected, the original huge productivity is prevented from changing into waste properties so as to promote the forward development of the emerging industry and the low-carbon economy.

The invention discloses a preparing method for furfural, and belongs to the technical field of biorefinery. The preparing method is characterized by including the steps that 1) corncobs are micro-smashed, methyl alcohol is added, and the mixture is stirred and soaked to be subjected to solid-liquid separation; 2) methylbenzene and dilute sulphuric acid with the mass concentration of 3% to 10% aredirectly added into a solid-liquid-separation liquid phase, and an acidolysis reaction is conducted under the stirring condition, wherein the mass ratio of the dilute sulphuric acid to methylbenzene to the corncobs in the step 1) is (20-50):(15-45):10; 3) acidolysis is completed, standing is conducted, then separation of the water phases and oil phases is conducted, and oil phases distill to recover methylbenzene, and the biorefinery is obtained. Solid in the preparing method is not subjected to acid treatment, residual methyl alcohol is easy to volatilize and treat, and follow-up using is notinfluenced. In the hydrolytic process, the generated furfural is continuously separated through methylbenzene, it is also promoted that hydrolysis normally runs, and the yield is greatly increased; the used methylbenzene can be distilled, recycled and reused.

The invention belongs to the field of biorefinery, and relates to a method for synthesizing L-lactide by producing chiral L-lactic acid from a lignocellulose raw material. The method comprises the following steps: (1) removing an inhibitor from a pretreated lignocellulose raw material in an ultimate biodegradation manner; (2) performing high-solid-content synchronous saccharification and co-fermentation on the lignocellulose raw material to obtain cellulose L-lactic acid with high concentration, high chirality and extremely low residual sugar; (3) preparing polymer grade L-lactic acid; and (4) carrying out dehydration, polycondensation, depolymerization and purification on the purified cellulose chiral L-lactic acid to obtain L-lactide. According to the method disclosed by the invention, the influence of an inhibitor on L-lactic acid fermentation and L-lactic acid purity is relieved by adopting a biodegradation method, high-concentration and extremely low-residual-sugar cellulose chiral L-lactic acid is obtained by adopting a high-solid-content total-sugar co-fermentation method, and the cellulose chiral L-lactic acid is subjected to the steps of purification, polycondensation, depolymerization and the like; the synthesis of the L-lactide from the lignocellulose raw material is realized.

The invention belongs to the technical field of dissolving pulp preparation, and particularly relates to a preparation method of broadleaf wood dissolving pulp. The preparation method of the broadleaf wood dissolving pulp is characterized by comprising the following steps: (1) carrying out steaming treatment on broadleaf wood chips and then carrying out extrusion treatment; (2) pretreating the extruded wood chips by using a mixed solution of p-toluenesulfonic acid, sodium hypochlorite and sodium chlorite to obtain crude pulp, performing ultrasonic dispersion treatment on the crude pulp, and then washing and filtering the pulp until the crude pulp is neutral; (3) carrying out two-stage oxygen delignification treatment on the slurry; (4) carrying out chlorine dioxide bleaching treatment on the pulp subjected to oxygen delignification; (5) carrying out secondary bleaching treatment on the pulp by using enhanced alkali to obtain the dissolving pulp. The method has the beneficial effects that the reaction condition is mild, the reaction time is short, the pulping process flow is simple, the environmental pollution and machine corrosion are small, and the green concept of modern biorefinery is met.