13 results about "Hydrothermal liquefaction" patented technology

The embodiment of the application discloses a nitrogen content prediction method, a program product, an equipment and a storage medium, comprising: obtaining experimental data of each biomass raw material under each hydrothermal liquefaction reaction condition, and constructing a data set according to the experimental data; performing cluster analysis on the data set based on the element composition of the raw material and the organic composition of the raw material to obtain each sub-data set corresponding to the data set; performing data enhancement on each sub-data set according to a predetermined random disturbance to obtain each enhanced sub-data set, and determining a model training data set according to each enhanced sub-data set; training a predetermined initial nitrogen migration and conversion prediction model based on the model training data set to obtain a target nitrogen migration and conversion prediction model. The application constructs a nitrogen migration and conversion prediction model suitable for small sample and high heterogeneity data conditions. The prediction accuracy and generalization ability of the target nitrogen migration and conversion prediction model are improved.

The present disclosure relates to a continuous biomass hydrothermal liquefaction reaction intelligent control method and system, comprising: real-time monitoring of biomass feed solid content and feed flow rate by mass flow meter, dynamic adjustment of feed flow rate by feed pump frequency converter combined with pre-input material characteristic parameters, control of reaction residence time; based on real-time sampling data and feed flow rate, dynamic adjustment of reaction temperature and reaction pressure by prediction model, and adjustment of discharge valve opening to optimize reaction residence time; real-time monitoring of flow rate, regulating valve opening, separation temperature, separation pressure and liquid level of gas-liquid separation buffer tank and solid-liquid separation buffer tank, automatic adjustment of regulating valve opening according to separation pressure of gas-liquid separation buffer tank and solid-liquid separation buffer tank, and staged recovery of heat by three-stage cooler; judging whether the current key parameters exceed the warning value, if yes, triggering an emergency alarm signal and emergency process. The present disclosure improves the intelligence and safety of the continuous biomass hydrothermal liquefaction reaction process.

This invention discloses a method for preparing a composite flotation reagent using biomass hydrothermal liquefaction products, comprising the following steps: Raw material preparation: providing biomass raw materials rich in lipids or proteins; Catalytic hydrothermal liquefaction: placing the biomass raw materials and a composite catalyst in a reactor, reacting at a temperature of 250-350℃ and a pressure of 4-20 MPa, wherein the water content of the biomass raw materials is 70-95%, and the composite catalyst contains alkaline components, metal oxide components, and rare earth element components; Product separation: separating the reaction products into oil and water to obtain bio-crude oil containing amphiphilic molecules; Flotation application: applying the bio-crude oil as a composite flotation reagent to mineral flotation, where the bio-crude oil simultaneously functions as a frother and a collector. This invention uses waste biomass as raw material to prepare a composite flotation reagent with both frother and collector functions, realizing the resource utilization of waste and the green upgrading of flotation reagents, and has the characteristics of wide raw material sources, excellent reagent performance, and environmental friendliness.

The present invention provides an improved hydrothermal liquefaction process for managing and sequestering PFAS contaminants in waste materials.

This invention belongs to the field of hydrothermal liquefaction technology and discloses a method for CO2-promoted hydrothermal liquefaction demulsification and separation of rolling mill sludge. The method involves weighing rolling mill sludge into a high-pressure reactor, adding water, and introducing sufficient carbon dioxide gas to purge air from the reactor. A hydrothermal liquefaction reaction is then carried out, and the liquid phase product in the high-pressure reactor is collected and washed with acetone. The washing liquid and the liquid phase product in the high-pressure reactor are then vacuum filtered together. After washing the filter residue with acetone, a filtrate and a filter residue are obtained. The filter residue is dried to obtain the solid phase product of the reaction. Dichloromethane is added to the filtrate, and after thorough stirring and extraction, the liquid is separated. The upper layer is an aqueous solution, and the lower layer is a mixed solution of acetone, dichloromethane, and bio-oil. Rotary evaporation is used to remove the organic solvent from the oil phase mixture, yielding the oil phase. This invention improves the oil phase separation efficiency and calorific value of rolling mill sludge by using CO2 as a reaction atmosphere during the hydrothermal liquefaction process.

A process where a liquid or supercritical CO2 co-solvent is used in a hydrothermal liquefaction (HTL) process. The process improves yield of the HTL process.

The present invention relates to a method for use in a biogas plant having at least one digester (12) and a thermal treatment unit (50), the method comprising the steps of : a ) anaerobically digesting an organic biomass (18) in at least one digester (12) through microorganisms at a temperature below 50 ° C to produce methane-containing biogas (16) and a digestate (14); b) removing a major fraction (32) of the digestate (14) from the digestion process after a fast retention time t and subjecting at least part of said major digestate fraction (32) to a thermal treatment in a thermal treatment unit (50) at a temperature above 175 ° C for at least one minute, wherein the thermal treatment step involves at least one treatment selected from the group consisting of pyrolysis, torrefaction, gasification, hydrothermal gasification, hydrothermal carbonization and hydrothermal liquefaction; and c ) retrieving a minor fraction (34) of the digestate (14) from the digestion process after an inoculum retention time T that is longer than the fast retention time t, returning said minor digestate fraction (34) into the digestion process and mixing the minor digestate fraction with the organic biomass (18) within the digester (12).

The application discloses a kind of processing traditional chinese medicine residue's tubular continuous hydrothermal liquefaction oil preparation process, it is related to chemical production technical field.The processing traditional chinese medicine residue's tubular continuous hydrothermal liquefaction oil preparation process, the tubular reactor includes heat exchange shell, the heat exchange shell bottom is close to left end and is provided with drainage, the heat exchange shell bottom is close to right end and is provided with liquid inlet, the heat exchange shell is internally provided with reaction mechanism, the heat exchange shell is internally provided with flow increasing mechanism, the reaction mechanism includes discharge pipe.The processing traditional chinese medicine residue's tubular continuous hydrothermal liquefaction oil preparation process, by spiral pipe rotation, simultaneously make its inner wall vibrate, can push the reactant in spiral pipe inside, in this process, spiral pipe inside slurry particle continuously flushes, wipes pipe wall, simultaneously vibration can reduce lignin and the attachment contact of spiral pipe inner wall, lignin high temperature is not easy to adhere coking, need not frequent shutdown, improve the effect of reaction.

This invention relates to the field of biomass energy utilization technology and discloses a continuous hydrothermal liquefaction method for producing oil from high-moisture-content biomass. The method includes the following steps: adding biomass material into a tank for heating and pressurization, and stirring the biomass material using a stirring mechanism to accelerate its decomposition; simultaneously, the stirring mechanism scrapes off tar adhering to the inner wall of the tank and extracts gas above the oil surface inside the tank, injecting it into the biomass material at the bottom of the tank to generate bubbles, mimicking water boiling to assist in stirring the biomass material. This invention, by setting up a stirring mechanism to stir the biomass material, enables rapid decomposition and oil precipitation from the biomass. Simultaneously, the stirring of the biomass material and the scraping off of tar adhering to the inner wall of the tank prevent tar accumulation from clogging the oil flow channels, thus increasing the stability of the biomass-to-oil production process.

This invention provides a continuous segmented hydrothermal liquefaction system and control method. The material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module are sequentially connected. A control module is connected to each of these modules. The material storage and transportation module stores materials and liquids separately, mixes them, and then heats them into a mixture. This invention achieves the migration of various impurities from the solid phase product to the liquid phase through a pretreatment device and a post-pretreatment material separation device, thereby reducing the absolute content of impurities in the hydrothermal liquefaction material. This achieves the goal of improving the quality of biomass pretreatment as required by low-temperature hydrothermal pretreatment, enabling two-stage hydrothermal liquefaction of various biomass raw materials and expanding the system's applicability.

The invention relates to a process for treating a biocrude feedstock obtained from a hydrothermal liquefaction treatment to reduce the content of inorganic compounds, comprising: - a step of diluting the biocrude feedstock with a light organic diluent to obtain a diluted biocrude feedstock; - a step of washing the diluted biocrude feedstock with at least one aqueous solvent, followed by a step of backwashing with a counter-solvent comprising at least one hydrocarbon cut at a specific boiling point, in one or more countercurrent liquid-liquid extraction columns; - a raffinate fractionation step to obtain at least the biocrude feedstock depleted in inorganic compounds and a phase comprising the diluent.

The present invention relates to a process of hydrothermal liquefaction capable of generating a liquid stream rich in renewable molecules, with a lower oxygen content, lower percentage of water and lower acidity in comparison to other products from biomass conversion thermochemical processes. In order to carry out said process efficiently, a catalyst was developed, obtained from the calcination of castor bean hulls, for use in the biofuel sector aiming to provide an environmentally friendly alternative for the production of fuel.

The application relates to the technical field of resource recycling, and discloses a supercritical hydrothermal liquefaction catalytic recycling process suitable for oxygen-containing PET; the process comprises the following steps: carrying out gas-phase reduction state pretreatment and low-temperature plasma dry deoxidization on the oxygen-containing PET, carrying out high-density depolymerization induction and low-density deep liquefaction two-stage reactions in supercritical water, adopting a core-shell structure self-repairing type oxygen vacancy enrichment catalyst, applying a bias electric field to maintain activity, adding a reducing additive to cooperatively inhibit excessive oxidation, and realizing efficient selective recovery of terephthalic acid and ethylene glycol; the process can effectively inhibit free radical chain oxidation side reactions of the oxygen-containing PET in the supercritical liquefaction process, and improve the monomer yield and product purity of the terephthalic acid and the ethylene glycol; meanwhile, the catalyst can be magnetically recycled and regenerated and utilized by electric field cooperation; and the process is suitable for resource utilization of waste PET waste materials such as oxygen-containing barrier layers or oxygen scavengers.