24results about How to "Reduce separation energy consumption" patented technology

This invention relates to the field of waste salt resource utilization and industrial waste gas treatment technology, and provides a skid-mounted micro-interface enhanced dual electro-displacement device for preparing ammonium alkali from mixed salts. The invention includes a selective electrodialysis unit, a micro / nano bubble generator unit, and at least two sets of parallel multi-chamber dual electro-displacement units. The selective electrodialysis unit separates a mixed salt solution of sodium chloride and sodium sulfate into sodium chloride and sodium sulfate stock solutions. This device integrates selective electrodialysis, the micro / nano bubble generator, and the dual electro-displacement unit in a skid-mounted configuration, forming an integrated continuous flow reaction system. This device achieves efficient and synergistic resource conversion of industrial waste salt and waste gas, producing sodium carbonate and ammonium salts with high purity that meet national standards. Furthermore, the process is energy-saving, environmentally friendly, and produces no secondary pollution.

The application discloses a system and method for separating crude organosilicon monomers by six-tower heat integration rectification, and is characterized by comprising a high-removing tower, a low-removing tower, a light separation tower, a hydrogen-containing tower, a trimethyl tower, a dimethyl tower, a separator and a mixer; the high-removing tower is connected with a preheater through a pipeline; a gas phase outlet at the top of the high-removing tower is connected with an inlet of the separator through a first heat exchanger; one outlet of the separator is connected with an inlet of the mixer through a second heat exchanger; another outlet of the separator is connected with the inlet of the mixer through a third heat exchanger; an outlet of the mixer is connected with the high-removing tower and the low-removing tower respectively; the low-removing tower is connected with the light separation tower; the low-removing tower is connected with the dimethyl tower through a preheater; a bottom product outlet of the dimethyl tower is connected with an auxiliary reboiler and the third heat exchanger respectively; the light separation tower is connected with the hydrogen-containing tower through the first heat exchanger; the hydrogen-containing tower is connected with the trimethyl tower through the second heat exchanger; and the method has the advantages of realizing high-purity separation of crude organosilicon monomers and greatly reducing energy consumption in production.

The application relates to the technical field of liquid fuel preparation, and discloses a catalyst for preparing liquid fuel through CO2 hydrogenation as well as a preparation method and application of the catalyst. The catalyst preparation method comprises the following steps: (1) synthesizing Na-MOR molecular sieves through a template-free hydrothermal method, and sequentially performing ammonium exchange, pyridine adsorption, sodium exchange, metal salt exchange and diethylamine solution exchange to obtain 8Na-12Me-MOR molecular sieves; and (2) mixing the 8Na-12Me-MOR molecular sieves and metal oxides to obtain the catalyst. According to the application, Na ions selectively occupy 8-member ring acid sites of the MOR molecular sieves, metal ions partially exchange 12-member ring acid sites, the 12-member ring acid strength and the pore environment are effectively controlled, the product is concentrated in the C5-C 11 range, the selectivity of the liquid fuel can reach 65-80%, the selectivity of methane is lower than 12%, and the stability of the catalyst is excellent.

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

This invention relates to the field of acyclic or carbocyclic compounds and discloses a method for preparing 6-bromo-2,3-difluorotrifluorotoluene, comprising: dissolving 2,3-difluorotrifluorotoluene in a mixed solvent composed of a polar modifier containing a proton acceptor site and a nonpolar solvent; adding a polyether stabilizer and an iron-based catalyst; and dropwise adding liquid bromine to trigger a directional bromination reaction. The method utilizes the protonated ion-pair complex formed by the in-situ generation of hydrogen bromide and the polar modifier, which, in conjunction with the polyether stabilizer, constructs a sterically hindered shielding structure at positions 4 and 5 of the substrate molecule. This invention forces the electrophilic substitution pathway to be directed towards position 6 of the substrate molecule, overcoming the bottleneck of extremely low positioning accuracy in passivated aromatic ring systems, transforming disordered isomers into a single dominant isomer, thereby reducing separation energy consumption.

This invention discloses a process for in-situ decarbonization of oily sludge using autocatalytic gasification of sintering circulating flue gas to produce hydrogen-rich gas, which is then reinjected into the sintering machine. The core innovation of this process lies in the fact that it eliminates the need for additional catalysts and carbon-fixing agents. It directly utilizes the metal oxides contained in the ash of the oily sludge as an autocatalyst and the calcium-based components as a carbon-fixing agent. Using sintering circulating flue gas as the gasification medium, under reaction conditions of 500-900℃, the autocatalytic gasification of the oily sludge and in-situ carbonization of CO2 are simultaneously achieved, thereby producing high-purity hydrogen-rich gas. This hydrogen-rich gas is then reinjected into the sintering machine, replacing fossil fuels in sintering production. Simultaneously, the iron- and calcium-rich residue generated after the reaction is recycled back into the ore and used as sintering raw material in the sintering process, realizing the resource recovery of valuable elements. This invention effectively achieves waste resource utilization, process decarbonization, and energy cascade utilization, significantly reducing the total carbon emissions and production operating costs of the sintering process.

This invention discloses a method for producing hydrogen and co-producing liquid carbon dioxide by methanol cracking. Methanol and demineralized water are pressurized and then vaporized into gaseous methanol and water vapor via heat exchange. This vapor is sent to a conversion tower to convert methanol and water into carbon dioxide, hydrogen, a small amount of methane, and a small amount of carbon monoxide. Excess steam is then cooled via heat exchange and sent to a temperature swing adsorption separation unit to remove liquid. The high-pressure liquid is pressurized and returned to the raw material methanol system. The dried gas is directly sent to carbon dioxide liquefaction. The liquefied gas is then purified by Fischer-Tropsch purification of carbon monoxide and carbon dioxide before being sent to a pressure swing adsorption hydrogen production unit to produce hydrogen with a concentration of over 99.9%. The regenerated gas-liquid mixture is heated during the methanol-water vaporization process using catalytic combustion.

The application provides a method and a process system for continuously producing citronellal from citral. The method comprises the following steps: introducing hydrogen into citral to produce citronellal under the catalysis of a catalyst; wherein the hydrogen introduced in the hydrogenation reaction contains 100-600 ppm of activating gas; and the activating gas is selected from NO or NO2. The method and device for continuously producing citronellal from citral provided by the application overcome the shortcoming that noble metal catalysts in aldehyde systems are easily poisoned by CO generated by aldehyde decomposition, realize online activation of the catalyst, and realize circulation and reuse of the catalyst in the reactor.

The invention relates to a method for preparing lactide with different optical purities, belongs to the technical field of lactide preparation, and discloses a method for preparing lactide with different optical purities through multistage depolymerization, lactic acid oligomer is depolymerized, segmentation is carried out at least twice in the depolymerization process to obtain crude lactide with different m-lactide contents, and optionally, the crude lactide is separated from the crude lactide to obtain the lactide with different optical purities. And respectively purifying crude lactide with different contents of m-lactide. According to the invention, mixing of m-lactide and lactide with optical purity is reduced from the source, and lactide with different optical purity can be obtained as required; the method provided by the invention can obtain gt; according to the present invention, the lactide with the optical purity of 96% does not need the separation of m-lactide and L-lactide, such that the amount of the lactide crude product requiring the separation of m-lactide and L-lactide is substantially reduced, and the separation energy consumption is reduced.

This invention discloses a highly efficient composite solubilizer for the hydration of butene to sec-butanol, belonging to the field of chemical process technology. Its composition includes: 0-60 parts of a polyether-based polymeric surfactant, 15-35 parts of a highly polar aprotic solvent, and 10-20 parts of a co-catalyst. The main solubilizing component of this invention disperses oily butene into extremely small droplets, allowing it to mix uniformly in water, thereby increasing the surface area for the reaction. The co-solvent, as the main component, provides a stable environment, ensuring that this highly mixed state is maintained for a certain period. The added additives, possessing both water and oil solubility, facilitate smoother dissolution of the mixture and help the reactants quickly contact the active sites of the catalyst. This accelerates the reaction rate of butene and water, significantly improving the efficiency of the one-time conversion to sec-butanol and greatly saving the large amount of energy required for material recycling.

The present application relates to a kind of for aromatic hydrocarbon combined plant adsorption separation unit extract partition wall rectification system, including partition wall rectification tower, toluene separation flow path, p-xylene separation flow path and p-diethylbenzene separation flow path;Partition wall rectification tower includes the partition wall being arranged in tower interior, one end of partition wall is fixed in tower bottom, the other end of partition wall extends upwards and is kept a certain distance from tower top, and partition wall separates the space in tower interior into first separation chamber and second separation chamber being arranged left and right, and common rectification chamber being located above partition wall, first separation chamber, second separation chamber and common rectification chamber are in fluid communication;Toluene separation flow path is connected with the top of common rectification chamber;P-diethylbenzene separation flow path is connected with the bottom of first separation chamber;P-xylene separation flow path is connected with the bottom of second separation chamber.Compared with double-tower rectification process, investment is greatly reduced, tower top gas cooling load is less, system waste heat is fully recycled, energy consumption and cost are reduced, and economic benefit is generated.

The invention discloses a method for preparing vicinal diol, which comprises the following steps: carrying out contact reaction on raw materials containing olefin, an oxidant and halogenated alcohol in the presence of a titanium silicalite molecular sieve catalyst and a hydration catalyst to obtain a vicinal diol-containing product, and has the advantages of mild reaction conditions, simple operation process and high yield. The method has the characteristics of high oxidant conversion rate and effective utilization rate, high vicinal diol selectivity and low product separation energy consumption.

The invention provides a system and a method for preparing synthesis gas and hydrogen from biogas through medium-temperature chemical looping, and belongs to the technical field of preparation of synthesis gas and hydrogen from biogas through medium-temperature chemical looping conversion. The system comprises a biogas desulfurization system, a reduction reaction system, a water vapor oxidation reaction system, a hydrogen extraction system and an oxygen carrier circulating system, and the method comprises the following steps: by adopting the system, firstly desulfurizing biogas, and then carrying out reduction reaction on purified biogas and an oxidation-state oxygen carrier in a reduction reactor; the generated reduction state oxygen carrier and water vapor are subjected to an oxidation reaction in the water vapor oxidation reactor, obtained crude hydrogen is purified into high-purity hydrogen, meanwhile, heat is recycled through the heat exchange device, the oxygen carrier is recycled, the system aims at solving the problem of carbon emission caused by mass use of fossil fuel, and the prepared hydrogen is high in concentration, easy to separate and low in cost. Meanwhile, methane is efficiently utilized to prepare synthesis gas and green hydrogen, and emission reduction and green methanol synthesis are assisted.

This invention discloses a biomimetic seawater separation method combining supercritical water gasification, relating to the field of biomimetic seawater separation and capture technology. It aims to address the current CO2 separation technology's lack of clear prediction of the relationship between the captured concentration and capture rate after syngas separation, its failure to clearly define the upper limit of the separation system, and the lack of clear calculation of the changes in capture flow rate and concentration with respect to capture parameters for the captured gas. The key technical solution comprises the following steps: S1: Biomimetic seawater generation; S2: Biomimetic seawater purification; A1: Calculating dissolved amounts: determining the dissolved amounts of each gas component in the biomimetic seawater and the undissolved amounts in the gas phase; A2: Calculating the separation upper limit: calculating the limit of the separation system based on the values ​​of the dissolved amounts of each gas component in the biomimetic seawater and the undissolved amounts in the gas phase; S3: Separation at atmospheric pressure; S4: Gas phase separation. This achieves lower separation energy consumption and less separation energy loss.

The invention discloses a liquid-liquid extraction dearomatization process and system, and belongs to the field of petrochemical industry. According to the process, N, N '-dialkyl pyrrolidone and / or N, N'-dioxypyrrolidone is used as an extraction solvent, and separation is completed through four steps of liquid-liquid extraction, raffinate oil rectification, back extraction and solvent and aromatic hydrocarbon recovery. The aromatic hydrocarbon selectivity and dissolving capacity are enhanced through the double-ring synergistic effect of the twin-structure solvent, the problems that an existing monocyclic solvent is low in selectivity and large in agent-oil ratio, and water washing is needed for solvent recovery are solved, raw material pretreatment and a cosolvent are not needed in the process, the aromatic hydrocarbon recovery rate reaches 85% or above, the solvent recovery rate exceeds 91%, and the method is suitable for industrial production. The method is suitable for high-efficiency separation of aromatic hydrocarbons and non-aromatic hydrocarbons of various fuel oils such as straight-run diesel oil, catalytic diesel oil and reformed gasoline.

The application belongs to the technical field of fine chemical industry, and discloses a synthesis method of malonic acid ester compounds, which comprises the following steps: under the action of a heterogeneous catalyst, cyanoacetic acid and alcohol are subjected to hydrolysis-esterification reaction, and after the reaction is completed, post-treatment is performed to obtain the malonic acid ester compounds; the heterogeneous catalyst comprises a carrier and an active component; the active component comprises an ionic liquid and an active metal; the carrier is an ordered mesoporous material; and the active metal is an alkaline earth metal. The method can obtain malonic acid ester products, solves the problems of low yield, serious equipment corrosion and large amount of "three wastes", realizes efficient synthesis of malonic acid ester compounds, improves production efficiency, and greatly reduces environmental pollution.

The application provides a synthesis process of hexamethyldisilazane. The synthesis process comprises the following steps: adding trimethylchlorosilane into liquid ammonia, then performing high-pressure stirring reaction to obtain a reaction liquid; performing layer separation, and performing rectification on the lower layer of the reaction liquid to obtain hexamethyldisilazane; performing pressure relief on the upper layer of the reaction liquid, and ammonia gas is generated after the liquid ammonia is vaporized, and ammonium chloride solid is precipitated; performing reduced-pressure drying on the ammonium chloride solid, desorbing the ammonia gas adsorbed on the ammonium chloride, and obtaining refined ammonium chloride. The reaction does not need to add any solvent, the reaction rate is adjusted by controlling the dropping speed of trimethylchlorosilane, and the generated by-product ammonium chloride is completely dissolved by controlling the addition amount of liquid ammonia, so that the mass and heat transfer effects of the reaction are ensured, the product conversion rate is improved, the reaction time is shortened, and the product is easy to separate. The method avoids the use of solvent, generates less waste liquid, is green and environmental protection, and is low in cost.

The present application belongs to the technical field of petroleum chemical industry, and discloses a condensate oil separation process and device. The core of the condensate oil separation process is to improve the 'light and heavy gradual separation' process into a 'light, medium and heavy simultaneous separation' new process, and to open the side line production in the primary distillation column and the fractionating column of the condensate oil separation device. Part of the intermediate components are separated in advance, so that the back mixing of the intermediate component light naphtha in the primary distillation column and the back mixing of the intermediate component heavy naphtha in the fractionating column can be reduced, repeated rectification can be avoided, the separation difficulty of the system and the energy consumption can be effectively reduced; the C5 separation tower of the old original process is used for separating the mixed fraction of light naphtha and heavy naphtha after the pressure reduction transformation of the C5 separation tower; the heat pump technology is used in the debutanizer, the low-grade heat at the top of the tower is upgraded to serve as the reboiling heat source at the bottom of the debutanizer, part of the steam at the bottom of the tower is replaced, and the consumption of the cold utility at the top of the tower is reduced.

This invention discloses a diesel fuel aromatic removal adsorbent, its preparation method, and its application. The main component of the adsorbent is silicon dioxide, which is synthesized through a hydrolysis reaction of organosilanes and alcohols in water. After washing and drying, the adsorbent is formed by rolling to control the particle size and achieve high sphericity. The formed adsorbent is then metal-modified, resulting in a large specific surface area and fast mass transfer rate. It is used to adsorb and separate aromatic components in diesel fuel, exhibiting advantages such as large adsorption capacity and high aromatic selectivity.

The invention relates to a separation system, a separation method and a phase separation device for a mixture containing pyridine or derivatives thereof, and the separation method comprises the following steps: S1, extracting a mixture material flow containing pyridine or derivatives thereof in an extraction tower by adopting an extraction agent to obtain an extraction liquid material flow and a raffinate material flow; s2, rectifying the extraction liquid material flow in an extraction agent recovery tower, and respectively obtaining a product material flow and a first gas phase material flow at a tower kettle and a tower top; performing condensation and phase splitting on the first gas phase material flow to respectively obtain a first oil phase material flow and a first water phase material flow; the first oil phase material flow flows back to the extraction agent recovery tower. According to the method, the pyridine or the derivative thereof in the mixture is recovered by virtue of an extraction means, so that the energy consumption can be reduced, the pollutant content in the discharged material flow is lower, the discharged material flow reaches the discharge standard, and the recovered material can be used as a medicine raw material to generate additional value.

This invention discloses a method for preparing methyl ethyl carbonate and diethyl carbonate via transesterification under ambient temperature and pressure. Using dimethyl carbonate and ethyl acetate as raw materials, and sodium methoxide or sodium ethoxide as a catalyst, the raw materials are continuously added to a reaction vessel at 5-25℃ and 0.1MPa±0.02MPa. The stirring rate is 50-100 r / min, the temperature fluctuation is ≤±1℃, and the material residence time is 5-30 minutes, reaching reaction equilibrium when the dimethyl carbonate conversion rate fluctuation is ≤±0.5%. After the reaction, the generated Na₂CO₃, NaHCO₃, and CH₃COONa mixed solids are removed by vacuum filtration, pressure filtration, or centrifugation. The equilibrium liquid is sent to a continuous distillation column for separation and purification through multi-column distillation to obtain methyl ethyl carbonate and diethyl carbonate. Unreacted raw materials are recycled, and the byproduct methyl acetate is sold as a chemical product. This invention features mild reaction conditions, low equipment requirements, high reaction efficiency, low energy consumption, simple separation, no azeotropic interference, high resource utilization, and is suitable for continuous production.

The present application relates to the technical field of fine chemical separation and wastewater treatment, in particular to a method for rectifying and purifying epoxy hydrogen propane and recycling wastewater, which comprises the steps of pre-light removal treatment, main rectification purification, wastewater pretreatment, deep oxidation treatment, recycling and waste heat recovery. The main rectification adopts biomimetic fractal structured packing, combined with online near-infrared spectrum self-adaptive adjustment of reflux ratio, to stably produce high-purity epoxy hydrogen propane. The wastewater is deeply degraded by composite magnetic flocculation and bismuth-based nano photocatalysis, and then recycled and industrial salt recovered by reverse osmosis and evaporation crystallization. The rectification waste heat is used in stages by phase change heat storage medium to provide heat for the subsequent units. The present application improves the separation and wastewater treatment efficiency, reduces energy consumption and operating cost, realizes resource recycling, solves the problems of unstable purity, substandard treatment and resource waste in traditional process, and helps the green development of the industry.

The invention belongs to the technical field of chemical separation, and discloses an efficient and energy-saving system and method for separating maleate from maleic anhydride esterification liquid and application, the system comprises an esterification reaction device, a reduced pressure rectifying tower, a dividing wall rectifying tower, a first condenser, a second condenser, a first reboiler and a second reboiler, the esterification reaction device, the reduced pressure rectifying tower and the dividing wall rectifying tower are sequentially connected, the first condenser and the first reboiler are connected with the reduced pressure rectifying tower, and the second condenser and the second reboiler are connected with the dividing wall rectifying tower. By adopting a vacuum distillation and partition wall distillation coupling system, the problem of low product purity caused by reverse conversion of an intermediate product monomethyl maleate into maleic anhydride can be effectively avoided, the product yield is improved, the use of methanol in a reaction device and the energy consumption in a dimethyl maleate product separation process are remarkably reduced, and the production cost is reduced. And the product purity is improved.

The application relates to a carbon capture system for oxygen-enriched combustion based on molecular sieve adsorption separation, and relates to the field of efficient combustion and flue gas pollutant purification treatment. The carbon capture system for the existing power plant applying the oxygen-enriched combustion technology solves the problems of high oxygen enrichment energy consumption and complex system. The utility model is characterized in that air is cooled by a cold water heat exchanger, oxygen in the air is enriched by N-stage oxygen molecular sieve groups, the oxygen-enriched air is mixed uniformly in a mixing tank, the mixed air is subjected to oxygen-enriched combustion in a combustion system, flue gas is subjected to desulfurization and denitrification and water separation, and then the flue gas is subjected to pressurization and cooling to separate liquid carbon dioxide, so that the carbon dioxide in the flue gas is captured. The N-stage oxygen molecular sieve groups greatly reduce the oxygen separation energy consumption, and the concentration of the oxygen-enriched gas can be flexibly adjusted without setting a complex system, so that the utility model is suitable for different types of oxygen-enriched combustion power plants. The utility model is mainly used in the power plant applying the oxygen-enriched combustion technology.