46results about How to "Reduce separation energy consumption" patented technology

The production equipment comprises a slurry tank, an esterification reactor, a multi-stage polycondensation tower and an esterification separation tower which are sequentially connected, the esterification separation tower is further circularly connected with the esterification reactor, the slurry tank is used for feeding alcohol and acid, the esterification reactor is used for carrying out esterification reaction, and the multi-stage polycondensation tower is connected with the esterification separation tower. The multi-stage polycondensation tower comprises multi-stage tower sections, the pressure of the multi-stage tower sections is gradually reduced from the feeding end to the discharging end, the multi-stage polycondensation tower is used for carrying out polycondensation reaction on esterification materials from the esterification reactor, polycondensation products generated by the multi-stage polycondensation tower are discharged, and the esterification separation tower is used for separating water, alcohol and small molecular substances in polycondensation condensate; and alcohol separated by the esterification separation tower flows back to the esterification reactor. The device can be used for continuous production of low-molecular-weight polyester, and can reduce equipment investment and separation energy consumption and reduce energy consumption and cost while improving efficiency and yield.

The invention belongs to the technical field of olefin hydroesterification reaction and catalysts thereof, and particularly relates to a Pd-loaded PAN catalyst, a preparation method thereof and a method for preparing carboxylic ester by adopting the Pd-loaded PAN catalyst. The preparation method of the Pd-loaded PAN catalyst comprises the following steps: performing vacuum drying on PAN, and then pre-oxidizing to obtain pre-oxidized PAN; adding the pre-oxidized PAN into a sulfonating reagent solution, stirring for reaction, taking out, washing and drying to obtain sulfonated PAN; and putting the sulfonated PAN into a Pd compound solution in a dark N2 atmosphere, and filtering, washing and drying after dipping to obtain the Pd-loaded PAN catalyst. According to the preparation method of the Pd-loaded PAN catalyst provided by the invention, the prepared catalyst has many active sites and is applied to preparation of carboxylic ester, so that the catalyst is recycled, and the stability of the catalyst is improved.

The invention belongs to the technical field of azeotropic distillation and dehydration of isopropanol, particularly relates to an azeotropic distillation and dehydration method of industrial-grade isopropanol, and aims to solve the problems that the energy consumption of separation of isopropanol and solvents is high, the energy consumption is low and the like due to the fact that solvents such as benzene and cyclohexane are adopted for azeotropic distillation and dehydration in the conventional isopropanol dehydration process, but the boiling points of benzene and cyclohexane are close to those of isopropanol. In order to solve the problems that when diethyl ether is used as an azeotropic agent, the solvent is easily enriched at the tower top to form potential safety hazards, and when the solvents are used for azeotropic distillation, the requirements of electronic chemicals cannot be met, the following scheme is provided: the method comprises the following steps: S1, adding an industrial-grade isopropanol raw material into an azeotropic distillation tower; the azeotropic dehydrating agent disclosed by the invention is small in boiling point, high in ignition point, non-corrosive, low in price, good in safety and low in separation energy consumption, and has excellent application value and application prospect in industrial production and experiments, the used device is simple and easy to operate, the yield is high, and automatic production can be realized.

The invention provides a pretreatment system for desalting a salt-containing alcohol-water mixture. The pretreatment system comprises a coarse separation tower and a dehydration tower, a bottom extraction port of the coarse separation tower is connected with an extraction port of the dehydration tower, and an extraction port at the bottom of the dehydration tower is connected with a coarse salt-containing mixture pipeline and a salt-containing pipeline; an extraction port at the top of the dehydrating tower is connected with an extraction port of the phase-splitting tank, an extraction port of the phase-splitting tank is connected with a water recycling pipeline and a return pipeline, and water, salt and fusel components are continuously separated and removed through the pretreatment system of the coarse separation tower and the dehydrating tower, so that equipment blockage is avoided, the separation energy consumption is reduced, and the operation intensity is reduced. The coarse separation tower and the dehydration tower have rectification and crystallization coupling effects, the purpose of separating water, salt and a target product can be achieved at the same time, the simplest process flow is achieved, the number of equipment is reduced, the occupied area is small, and the cost is further saved.

The present application includes a production process, device and method of cyclopentanol. The process includes pyrolyzing a raw material containing dicyclopentadiene to obtain a material A containing cyclopentadiene, mixing it with hydrogen and contacting it with a bimetallic catalyst to undergo a hydrogenation reaction to obtain a material B containing cyclopentene, cyclopentadiene and cyclopentane, mixing it with an acid and a solid acid catalyst to undergo a catalytic esterification reaction to obtain a material C containing fatty acid cyclopentyl ester and fatty acid cyclopentenyl ester, and mixing the material C with hydrogen and then mixing it with a copper-based hydrogenation catalyst to undergo a hydrogenation reaction to obtain a product containing cyclopentanol. The device includes a pyrolysis unit, a selective hydrogenation unit, a catalytic distillation unit and a catalytic hydrogenation unit connected in series in a pipeline; the route has low raw material cost, mild reaction conditions, simple operation, low separation energy consumption, and is suitable for continuous and stable large-scale production. Adding an inhibitor prolongs the life of the catalyst and improves the yield. The yield of cyclopentanol is more than 95% based on cyclic olefins as raw materials.

The present application relates to the field of chemical and chemical technology, and in particular to a method for synthesizing sodium azide. It can solve the problems of long reaction time, low production efficiency, many by-products, large pollution emissions, and high safety hazards in the sodium azide preparation process in the related technology. A method for synthesizing sodium azide, comprising: using aromatic alcohol as a raw material to prepare nitrite ester of aromatic alcohol; under alkaline conditions, allowing nitrite ester to undergo a reduction reaction with hydrazine hydrate to prepare sodium azide; wherein the aromatic alcohol comprises: one or more compounds represented by the structural formula: #imgabs0#, wherein Ar is selected from the following substituted or unsubstituted C6~C 20 Aryl and substituted or unsubstituted C3~C 10 Any one of the heteroaryl groups, R is selected from #imgabs1#n is an integer of 1 to 3; wherein, in #imgabs2#, R1 and R2 are the same or different and are independently selected from any one of H and C1 to C3 alkyl groups; when Ar is selected from substituted C6 to C 20 Aryl or substituted C3~C 10 In the case of heteroaryl, the substituted substituent is selected from C1-C9 alkyl, and * indicates the attachment site.

The invention belongs to the technical field of olefin hydroesterification reaction and catalysts thereof, and particularly relates to a sulfonic acid resin-based Pd catalyst double-modified by a sulfonic acid group and a phosphine ligand, a preparation method of the sulfonic acid resin-based Pd catalyst and application of the sulfonic acid resin-based Pd catalyst in olefin hydroesterification reaction. The preparation method of the sulfonic acid resin-based Pd catalyst comprises the following steps: adding halogen into sulfonic acid resin in a dark place, and refluxing alkali liquor to obtain halogenated sulfonic acid resin; carrying out reflux reaction on the phosphine ligand and a deprotonation agent to obtain a phosphine ligand precursor; dropwise adding a phosphine ligand precursor into the halogenated sulfonic acid resin for reaction, and adding an acidic solution to obtain dual-modified sulfonic acid resin; and adding sulfonic acid and phosphine ligand double-modified sulfonic acid resin into the Pd compound, carrying out impregnation reaction, and drying to obtain the sulfonic acid resin-based Pd catalyst. When the sulfonic acid resin-based Pd catalyst is used for preparing organic carboxylic ester, the product is easy to separate, the corrosion to equipment is small, the repeated utilization rate of the sulfonic acid resin-based Pd catalyst is high, the reaction conditions are mild, the raw material application range is wide, and the product selectivity is high.

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 invention discloses composite separation membrane slurry and a preparation method thereof, a reverse osmosis composite membrane and application, and the preparation method comprises the following steps: dispersing SiO2 particles and a surfactant in water, and mixing to obtain SiO2 dispersion liquid; moS2 particles are uniformly dispersed in the SiO2 dispersion liquid, and a silicon-molybdenum mixed liquid is obtained; grinding the silicon-molybdenum mixed solution by using a colloid mill until the particle size of MoS2 particles is less than 500nm to obtain silicon-molybdenum slurry; and finally, filtering, cleaning and dispersing the silicon-molybdenum slurry to obtain the composite separation membrane slurry. The MoS2 is stripped into a porous sheet structure by adopting a colloid mill and utilizing extrusion and friction acting force among particles, and the reverse osmosis composite membrane prepared from the MoS2 has the advantages of large flux, high desalination rate, controllable pore diameter and good hydrophilicity, is beneficial for reducing desalination pressure, and can be applied to the fields of seawater desalination, saline-alkali water desalination, sewage desalination treatment and the like.

The invention discloses a preparation process of gamma-butyrolactone and vanadyl sulfate, and relates to the technical field of chemical synthesis. A preparation process of gamma-butyrolactone and vanadyl sulfate comprises the following steps: S1, adding acetic anhydride and vanadium pentoxide into a reaction container, introducing ethylene, and heating for reaction to obtain a reactant; s2, the reactant is filtered, filtrate and filter residues are obtained, the filtrate contains the target product gamma-butyrolactone, and the obtained filter residues are washed and dried for standby application; and S3, transferring the washed and dried filter residues into another reaction container, and adding sulfuric acid for dissolving to obtain another target product vanadyl sulfate solid. The method is simple in technological process, gamma-butyrolactone and vanadyl sulfate can be continuously prepared in one set of process, operation is convenient, product selectivity is high, high economic benefits can be brought, and the method has production and application value.

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.

The invention provides a process and a device for separating and purifying methylal. The device mainly comprises an azeotropic distillation tower, an azeotropic distillation tower top condenser, a decanter, an entrainer phase pump, a methanol phase pump, a methylal product pump, an entrainer recovery tower, an entrainer recovery tower top condenser, an entrainer recovery tower top reflux tank, an entrainer recovery tower top reflux pump, a methanol product pump and the like. A methylal and methanol mixture is separated by adopting an azeotropic distillation process, the methylal and methanol mixture enters an azeotropic distillation tower from the middle part of the tower, a supplementary entrainer enters the tower from the upper part of the tower, tower top reflux enters the tower from the tower top, the entrainer and methanol are extracted from the tower top of the azeotropic distillation tower, and a high-purity methylal product is extracted from the tower kettle of the azeotropic distillation tower. A methanol material carrying part of the entrainer enters the entrainer recovery tower from the middle lower part, the entrainer containing a small amount of methanol is extracted from the top of the entrainer recovery tower, high-purity methanol is extracted from the bottom of the entrainer recovery tower, and the prepared methylal product is high in purity and low in energy consumption.

The invention belongs to the technical field of environment-friendly materials and water treatment, and particularly relates to application of high-salt organic dyeing and printing wastewater treatment. The porous graphene film is provided with nano-pore mass transfer channels which are arranged in a staggered and stacked manner and have proper sizes in a vertical plane, and is provided with narrow interlayer mass transfer channels in a transverse plane, so that a two-dimensional nano-channel through which small-size water molecules and salt ions can rapidly permeate but large-size organic dye cannot permeate is formed. According to the porous graphene membrane prepared by the method disclosed by the invention, under the conditions of no operation pressure and 0.1 MPa operation pressure, the rejection rate of organic dye molecules is greater than 99%, the permeation flux of the porous graphene membrane is 2-4 orders of magnitude higher than that of the existing separation membrane, and the porous graphene membrane has good dye salt separation performance. The method has the advantages of green and environment-friendly preparation process, low energy loss, no need of pressure in the application process, extremely high economic cost performance and high synergy degree with other processes, and has a huge application prospect in the field of dyeing and printing wastewater treatment.

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.

The present application discloses a method for preparing aromatic hydrocarbons, the method comprising contacting a raw gas containing methyl halide and carbon monoxide with a solid acid catalyst to react and obtain aromatic hydrocarbons; the solid acid catalyst comprises an acidic zeolite molecular sieve. The method of the present application adds carbon monoxide during the conversion of methyl halide, which can significantly improve the selectivity of aromatic hydrocarbons (especially BTX); accordingly, the method has low production and separation energy consumption, and therefore has broad application prospects.

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 utility model discloses an amination reaction and separation system. The amination reaction and separation system comprises a reaction unit (1) and a separation unit which are connected through a pipeline, the separation unit comprises an ammonia tower (2), a light component removal tower (3), a crude product tower (5), a fine product tower (6) and a wastewater tower (7) which are sequentially connected through pipelines; and the reaction unit is connected with the ammonia tower (2) through a pipeline. The utility model discloses a reaction and separation system for preparing nitrogen-containing chemicals through catalytic amination of oxygen-containing compounds, which can realize continuous operation of the production process of the nitrogen-containing chemicals to obtain qualified nitrogen-containing chemical products, can also recover ammonia and oxygen-containing compounds which are not completely reacted, realizes up-to-standard discharge of wastewater, saves raw materials, reduces energy consumption, and is suitable for industrial production. The production cost is reduced.

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 invention discloses a preparation process of gamma-butyrolactone, and relates to the technical field of chemical synthesis. The preparation process comprises the following steps: S1, adding acetic anhydride and an oxidizing agent into a reaction container, introducing ethylene, and heating for reaction to obtain a reactant; s2, the reactant is filtered, filtrate and filter residues are obtained, and the filtrate contains the target product gamma-butylester; s3, the filter residues are recycled after being subjected to roasting treatment, and the filter residues serve as an oxidizing agent to be put into the step S1 again. The method is simple in process flow, easy to operate and high in product selectivity, can reduce the cost of raw materials, can bring high economic benefits, and has production and application values.

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.