35 results about "Membrane reactor" patented technology

The present application relates to a kind of synthesis method and device of isosorbide, comprising (1) the homogeneous mixture of sorbitol aqueous solution and solid catalyst in preheater, from the upper end of membrane reactor feed, under vacuum condition reaction, product flows from the lower end of reactor;(2) the separated solid catalyst after the dissolved product of flowing out is added organic solvent, filtrate is crystallized by cooling, and the product isosorbide is prepared.The present application selects membrane reactor and combines fluorine modified solid catalyst to carry out synthesis reaction, while ensuring yield, so that water can be quickly removed from the reaction system, reduce byproduct generation, avoid catalyst blockage, and prolong the service life of catalyst.

This invention discloses a comprehensive utilization method for the step-by-step conversion of mother liquor in lithium salt production, relating to the field of lithium salt preparation technology. The method includes: feeding lithium enrichment transformation liquid A (after liquid shaping) and sodium carbonate solution B1 into a micro-liquid membrane reactor MMR-101, where underequivalent transient nucleation occurs under conditions of η1 of 0.55-0.68; the resulting nucleated slurry enters the first-stage continuous crystallizer G1, where sodium carbonate solutions B2, B3, and B4 are distributedly added along the effective residence time axis; then it enters the second-stage continuous ripening crystallizer G2, where sodium carbonate solution B5 is added at the G2 inlet; and lithium carbonate is obtained through low-shear ripening, hot solid-liquid separation, hot displacement washing, and low-temperature vacuum drying. This method can suppress localized excessive nucleation and pulverization, reduce Na, S, and B entrainment, narrow particle size distribution, increase filtration flux, reduce washing water consumption, and extend continuous stable operation time.

This invention discloses a synergistic modification method for improving the CO2 decomposition performance of ceramic membrane reactors. By preparing a dense membrane substrate containing fluorite and B-site-doped perovskite phases, and constructing an A-site-defect perovskite porous coating on the CO2 feed side, the synergistic regulation of substrate stabilization and surface activation is achieved. The B-site-doped membrane substrate provides a stable transmembrane transport channel for oxygen species generated during CO2 decomposition, while the A-site-defect coating enhances the generation process of oxygen species on the CO2 feed side. Together, they reduce the resistance to surface reactions and oxygen migration on the CO2 side, enabling the membrane reactor to maintain long-term stable operation even at high CO2 decomposition rates. This invention provides an effective substrate-coating synergistic modification method for improving the CO2 decomposition rate and long-term operational stability of membrane reactors.

This application discloses a deep denitrification system for ultra-low C / N ratio kitchen waste slurry, belonging to the field of kitchen wastewater treatment technology. The system comprises three sequentially connected stages: pretreatment, fine treatment, and deep treatment. The pretreatment stage involves pretreatment, hydrolysis, acidification, and centrifugation, followed by pumping into an anaerobic external circulation membrane bioreactor composed of an anaerobic fermenter and an external PVDF tubular membrane. The PVDF tubular membrane effluent is divided into three streams: one is returned to the anaerobic fermenter, the other directly enters the flotation unit, or the third enters a combined deep denitrification coupling device consisting of an anaerobic reactor-membrane aeration biofilm reactor-anaerobic ammonia oxidation reactor. After deep denitrification, the effluent flows into the flotation unit, and after two-stage nitrification, it enters the ultrafiltration system. Part of the ultrafiltration permeate is reused for backwashing, and the concentrate is returned to the deep denitrification coupling device to adjust the C / N ratio. This application achieves differentiated efficiency enhancement, resource reuse, and energy saving of ultra-low C / N ratio kitchen waste slurry through three-stage gradient synergy and precise seasonal control, enabling deep denitrification without the need for an external carbon source.

The present invention relates to a method for producing polyvinylidene fluoride with polymerization of vinylidene fluoride, in particularly using a polymerization reactor that comprises a membrane.

The present application relates to a kind of liquid membrane reactor for gas-liquid reaction and the method of gas-liquid reaction.The reactor includes reactor shell and the several reaction tubes for carrying out chemical reaction arranged in reactor shell;The reactor shell is filled with reaction gas between reaction tube;Reaction liquid film is formed on the outer wall of the reaction tube;The inside of the reaction tube is used for the flow of heat conducting medium circulation.The reactor of the present application can improve the gas-liquid mass transfer efficiency under high viscosity system;Effectively prevent the liquid flooding phenomenon under high gas speed;While it can solve the problem of high viscosity material blockage, easy to clean and maintain.

The application provides a kind of oxygen-enriched membrane reactor and membrane bioreactor coupling sewage treatment system, relating to domestic sewage technical field, including: coupling treatment pool, clear water pool, sludge storage pool, equipment room, guide wall, sewage inlet pipe, air supply fan, oxygen-enriched membrane reactor and inorganic membrane bioreactor;The upper portion of the coupling treatment pool is the equipment room, and the air supply fan and the control system are in the equipment room.The application integrates the oxygen-enriched membrane reactor and the inorganic membrane bioreactor by modularization reinforcement treatment, forms the aerobic zone, the facultative zone and the anaerobic zone in the oxygen-enriched membrane reactor due to its unique structure and high oxygen utilization efficiency, is used for the nitrification of ammonia nitrogen and the removal of most total nitrogen, forms simultaneous nitrification and denitrification reaction in the reactor, further strengthens the removal of pollutants in water in the inorganic membrane bioreactor, and realizes the separation of sludge and water, so that the effluent quality of the sewage treatment system is stable and up to standard under the condition of ensuring certain fluctuation of water quantity.

This invention relates to a flow-type electrolysis device for enhancing carbon dioxide mass transfer and its application, comprising: a clamping assembly including a first clamping plate and a second clamping plate; at least one set of electrode assemblies, each including a cathode plate and an anode plate, the cathode plate being connected to the first clamping plate and the anode plate being connected to the second clamping plate, the cathode plate having a cathode medium outlet and a cathode medium inlet, and the anode plate having an anode medium outlet and an anode medium inlet; and a bipolar plate located between the cathode plate and the anode plate; wherein the diameter of the bipolar plate outlet is smaller than the diameter of the bipolar plate inlet. This invention utilizes the electrolyte flow characteristics to solve the problems of difficult water management and poor stability caused by salt deposition in traditional membrane reactors, ultimately achieving both high current density and stability in the electrocatalytic reduction of carbon dioxide. This enhances the carbon dioxide mass transfer process.

The application discloses a device and method for realizing autotrophic and heterotrophic coupling deep denitrification and dephosphorization of low carbon-nitrogen ratio sewage based on a continuous flow membrane aerated biofilm reactor. A hollow fiber membrane is arranged in the continuous flow reactor, and an oxygen concentration gradient is formed through bubble-free membrane aeration technology. In the biofilm area, spatial partitioning of functional bacteria such as nitrifying bacteria and anaerobic ammonia oxidation bacteria is established, two anoxic zones realize efficient denitrification through short-cut denitrification coupled with anaerobic ammonia oxidation (PD / A) and simultaneous nitrification and denitrification. In terms of phosphorus removal, the system adopts an anaerobic-aerobic operation mode, and the polyphosphorus bacteria release phosphorus in the anaerobic state and absorb excess phosphorus in the aerobic state, and finally, phosphorus removal is realized through residual sludge discharge. The system integrates an internal carbon source extraction process, recovers sludge carbon source to supplement the electron donor required for denitrification, and reduces operation cost and carbon emission. The continuous flow MABR denitrification system strengthens the denitrification efficiency of the PD / A system, is suitable for large-scale operation, and realizes efficient and stable deep denitrification of low carbon-nitrogen ratio municipal sewage treatment plants.

The application provides a method for continuously producing chitooligosaccharide with specific polymerization degree by using an immobilized enzyme membrane reactor. The method is as follows: 1. preparing a PLGA nanofiber-temperature-sensitive hydrogel composite carrier, fixing the carrier in the inner wall of a ceramic membrane to obtain a composite carrier membrane; 2. assembling the composite carrier membrane into a folding enzyme membrane reactor with temperature control, pressure monitoring and material switching units; 3. introducing enzyme solution to fix chitosanase, and then introducing pretreated chitosan substrate to catalyze the reaction; 4. monitoring the polymerization degree on line to control the reaction process, washing the reactor after the reaction to realize continuous production, and concentrating and spray drying the product to obtain the target product. The application fuses the characteristics of multiple carriers to construct a “rigid support-flexible regulation” structure: the ceramic provides stable mechanical support, the temperature-sensitive hydrogel adjusts the swelling degree with temperature, the enzyme active site is exposed at low temperature to improve the efficiency, and the product is released by shrinking at a later stage, so that the problem of product retention and side reaction is solved.

The present application belongs to the technical field of electrochemical gas separation and purification, and particularly relates to a flat-plate solid oxide oxygen ion conductor membrane reactor, a preparation method and application, and is particularly suitable for removing trace oxygen impurities; the solid oxide oxygen ion conductor membrane reactor adopts LSGM electrolyte, and composite material BSCF-SDC is used as the cathode and the anode; the membrane reactor can realize high removal of trace oxygen in argon under the condition of 750-900 DEG C and 1-2.0 V, so that the oxygen content can be lower than 10 ppm; the membrane reactor has the advantages of low energy consumption, high stability, no secondary pollution and the like, and is suitable for preparation of high-purity argon in the fields of semiconductor manufacturing, metal smelting and the like.

The application provides a device and method for regulating biological membrane niche to realize simultaneous methanogenesis and denitrification, and belongs to the technical field of water treatment, comprising a biological membrane reactor, a water distribution tank, a peristaltic pump, an aeration system and an electric stirrer, the biological membrane reactor is filled with biological membrane carriers, and an anoxic-anaerobic biological membrane layered structure can be formed inside the carriers. The application inoculates functional sludge, domesticates the biological membrane carriers, regulates aeration intensity to build a dissolved oxygen gradient, combines with microelectrode real-time monitoring of the dissolved oxygen and oxidation-reduction potential profile inside the carriers, realizes efficient cooperation of denitrifying bacteria and methanogenic bacteria in the same biological membrane reactor, integrates anaerobic digestion and denitrification process, has the advantages of low energy consumption, small land occupation and strong impact resistance, can simultaneously realize organic matter degradation and denitrification of high-concentration organic wastewater, optimizes carbon source utilization efficiency, reduces treatment cost, is suitable for treatment of various high-concentration organic wastewater, and has important theoretical innovation value and engineering application prospect.

This invention provides an apparatus and method for producing isobutyl methacrylate using a novel membrane reactor. The apparatus integrates a tubular fixed-bed reactor with a pervaporation membrane system. A compartmentalized structure maintains the pressure difference across the membrane, and a dual-tube module optimizes the channel spacing to suppress polymerization side reactions. During the reaction, the pervaporation membrane selectively removes the byproduct water, breaking the equilibrium limitation of the esterification reaction and significantly improving the feed conversion rate. Simultaneously, it disrupts the water-isobutanol azeotropic system, reducing subsequent separation energy consumption and achieving integrated reaction and separation processes. This invention solves the problems of equilibrium limitation on conversion rate, high separation energy consumption, and easy polymerization in traditional processes. It features high conversion rate, low energy consumption, and stable operation, making it suitable for the continuous and green production of isobutyl methacrylate.

This invention discloses a method for preparing multilayer molecular sieve membranes using in-situ phase inversion technology and its application in membrane reactors. It relates to materials research and development technology and mainly includes the following steps: after synthesizing a first layer of macroporous molecular sieve membrane on a support, a treatment solution is used to in-situ transform the surface layer of the molecular sieve membrane into a second layer of microporous molecular sieve membrane. Subsequently, a repair solution is used to repair structural defects in the formed second layer of molecular sieve membrane, ultimately obtaining a multilayer molecular sieve membrane. This invention solves the technical problem of the trade-off between permeability and selectivity currently faced by molecular sieve membrane materials. The resulting multilayer molecular sieve membrane possesses both high permeability and high selectivity, with the microporous molecular sieve membrane acting as an interceptor and the macroporous molecular sieve membrane acting as a dehydrator, thus enhancing the membrane's role in the reaction process. Furthermore, the multilayer molecular sieve membrane exhibits high coupling between its layers and a stable membrane structure, making it suitable for harsh industrial conditions and possessing significant application potential in the field of permeable membrane reactors.

A biological agent packing material, its preparation method, and its reactor for the simultaneous removal of ammonia nitrogen and nitrate are disclosed. The steps include: sludge enrichment and acclimatization, preparation of biological agent, preparation of steel slag and coal gangue micro-packing material, and biofilm formation. The reactor includes, from top to bottom, steel slag and coal gangue microporous packing material, porous aeration plates, guide plates, a support layer, a microporous aeration system, and filter plates. A backwash valve is installed at the bottom of the reactor, and the flow rate is controlled by a backwash water tank through a backwash flow meter. Backwashing is achieved by an inlet pump pumping water in conjunction with the porous aeration plates. An exhaust port is provided at the top of the reactor, and the water discharged through the outlet enters a sedimentation tank for sedimentation and drainage. The steel slag and coal gangue microporous packing material used in this invention simultaneously removes ammonia nitrogen and nitrate under the driving action of iron circulation. The preparation process is simple, suitable for domestic sewage and industrial wastewater, and features no secondary pollution, high biological activity, low cost, and simple operation and management. It has significant effects in the simultaneous removal of ammonia nitrogen and nitrate.

This invention discloses a continuous method for preparing 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid based on a cascaded process of cyclization-de-alcoholization-scraped membrane fluorination, belonging to the field of continuous synthesis technology in fine chemicals. The method includes: cyclizing ethyl 2-ethoxymethylene-4,4-dichloroacetoacetate with methylhydrazine in a loop reactor with forced external circulation, controlling the circulation ratio boundary at 15:1 to 18:1 to improve the selectivity of the target isomer; continuously removing at least some ethanol from the cyclized liquid and adding sulfolane for solvent replacement, ensuring that the ethanol content in the system before entering the fluorination stage is no higher than 1.0% (wt) and the water content is 0.1-0.2% (wt); subsequently, the resulting intermediate material, along with anhydrous potassium fluoride and 18-crown-6 to form a heterogeneous slurry, is fed into a vertical scraped membrane reactor, with a residence time strictly controlled at 169-171°C for 80-100 seconds, and rapid cooling within 3 seconds after discharge; finally, the target product is obtained through hydrolysis and acidification. This specific combined process can achieve high 1,3-isomer selectivity, high fluorination conversion, low aldehyde byproduct levels, and good long-term continuous operation stability without separating the cyclization intermediate.

The present application relates to sewage treatment technical field, disclose a kind of membrane aeration biological membrane reactor's operating method and operating device, sewage treatment system.The operating method has at least one control cycle during the continuous operation of reactor, the cycle includes: pre-control step, provide negative pressure pulse to membrane assembly inside, the normal compressive stress directed to membrane silk inside is applied to the biological membrane attached to the outer surface of membrane, so that the microstrain of outer layer structure is generated;Fluidized cutting step, add and fluidize circulating cutting microparticles to reactor, and microparticles are rolled cutting to the surface of biological membrane under the driving of fluid.By the cutting action of cutting microparticle and negative pressure pulse, the outer layer of biological membrane is selectively stripped from invalid biomass.The present application realizes the fine control from inside to outside to biological membrane under the condition of not interrupting sewage treatment process, can long-term maintain biological membrane in thin, high-activity ideal mass transfer state, effectively solve the problem that mass transfer efficiency attenuates with operating time.

The utility model provides a kind of preparation device of nanometer titanium oxide particle sol, the preparation process of titanium oxide particle sol is controlled using full membrane method process, specific content includes: dynamic microporous ceramic membrane feed, dynamic rotation+microporous penetration, realize the high homogenization of reaction system;Dynamic ceramic membrane separates, concentrates and washes intermediate product, and the intermediate product is purified;Dynamic microporous ceramic reactor carries out on-line particle classification to reaction product, realizes the homogenization of product particle;Efficient separation alcohol and water by pervaporation membrane, realize the reuse of alcohol.The reactant is added in the device using membrane reactor D1 (dynamic rotating membrane reactor), so that the reactant is more evenly dispersed in the system, and the product particle size distribution is too wide due to local concentration being too high or too low is inhibited.

This specification describes a membrane-aerated biofilm reactor (MABR) and method for nitrosation, nitrosation-denitrosation, or deammonification. Oxygen supply through a gas transfer membrane is limited to inhibit growth of nitrite oxidizing bacteria (NOB). Exhaust gas from the MABR unit can have an oxygen concentration of 4% or less. The method can optionally include one or more of the following: intermittent (batch) feed process air; process air conditioning; process air direction reversal; process air recirculation; and, process air step flow. The method can optionally include adding inoculum sludge containing anammox to the reactor, optionally after pretreatment and selection.

This invention discloses an air separation system and method for co-producing hydrogen, belonging to the field of air separation and hydrogen production technology. It includes four oxygen-permeable membrane reactors and two condensers. The oxygen-producing outlet of the fourth oxygen-permeable membrane reactor (R4) is connected to the second condenser (C2), which has a condensate drain outlet and an oxygen outlet. The nitrogen-producing inlet of the third oxygen-permeable membrane reactor (R3) is connected to the air-producing outlet of the fourth oxygen-permeable membrane reactor (R4). The fuel-producing inlet of the second oxygen-permeable membrane reactor (R2) is connected to the fuel-producing outlet of the third oxygen-permeable membrane reactor (R3). The fuel-producing inlet of the first oxygen-permeable membrane reactor (R1) is connected to both the fuel-producing outlet and the hydrogen-producing outlet of the second oxygen-permeable membrane reactor (R2), and the hydrogen-producing outlet of the first oxygen-permeable membrane reactor (R1) is connected to the first condenser (C1), which has a condensate drain outlet and a hydrogen outlet. This invention simultaneously produces hydrogen, oxygen, and nitrogen through a reasonable process arrangement. The method is simple, efficient, and highly economical and practical.

The dehydration membrane reactor for methanol production from CO2 hydrogenation includes one or more porous supports, a dehydration membrane on the one or more porous supports, and a catalyst layer on the dehydration membrane. The one or more porous supports include hollow ceramic fibers and the dehydration membrane includes NaA zeolite. The reactor is made by dip-coating the porous supports in a zeolite crystal seed solution and drying the coated porous support. The coated porous support is dried at about 80° C. and then heated to a temperature above about 200° C. The NaA zeolite membrane is then grown on the seeded support, and a catalyst layer is applied to the zeolite membrane. A feedstream including carbon dioxide and hydrogen is fed to the catalyst layer, where a product stream including methanol and water is evolved. The water is then removed from the product stream through the dehydration membrane to produce a high-purity methanol product.

This invention discloses an oligomeric wheat peptide and its preparation method, belonging to the field of plant peptide technology. The method uses wheat bran as raw material, which undergoes extrusion puffing and ultrafine grinding pretreatment, followed by alkaline extraction combined with amylase hydrolysis to obtain a wheat bran protein extract. Subsequently, it undergoes low-temperature controlled denaturation pretreatment, followed by freeze-thaw cycles to partially unfold the protein. Cysteine ​​is added as a conformation-locking agent to form reversible mixed disulfide bonds with exposed free thiol groups to stabilize the metastable conformation. Then, site-specific enzymatic hydrolysis is performed in an ultrasound-assisted enzyme membrane reactor, with ultrafiltration separating the oligopeptides in real time. Finally, electrodialysis desalination, nanofiltration concentration, and spray drying yield high-purity wheat bran oligomeric wheat peptides with gastric mucosal protective activity. This invention achieves high-value utilization of wheat bran components, with a green and efficient process, and produces peptides with high uniformity and strong activity, significantly improving the quality and market competitiveness of wheat peptide products.

This invention relates to the field of rural domestic sewage treatment technology, and provides a micro-aeration biofilm reactor and treatment method. The reactor includes a swing frame installed in an aerobic tank, a membrane module installed within the swing frame, a water supply pipeline connected to the outside of the aerobic tank, a drive mechanism for driving the swing frame to swing back and forth relative to the aerobic tank, and an aeration tank connected to the outlet of the aerobic tank. A first aeration pipe is located in the aerobic tank at the bottom of the swing frame, and several first aeration heads are located at the bottom of the swing frame. A second aeration pipe is located in the aeration tank, and several second aeration heads are located on the second aeration pipe. The first and second aeration pipes are respectively connected to the air outlet of a blower. A flushing head is located on the upper part of the swing frame, and the flushing head is connected to the supernatant area of ​​the sedimentation tank by a connecting pipe, which is equipped with a circulation pump. This invention reduces aeration energy consumption, improves biochemical treatment efficiency, and enables online cleaning of the membrane module without disassembly.

This invention relates to the field of wastewater treatment technology, specifically to a spiral rotary MABR autotrophic denitrification reactor and its operation control method. By optimizing the distribution of membrane fibers in different regions of the inner and outer rings of the spiral rotary MABR membrane module, the sludge accumulation caused by excessively thick biofilm formation on the inner ring MABR membrane fibers is minimized. Through biofilm enhancement and reduction operations, the water level in the membrane reactor can be controlled and lowered, and the radial proportion of the membrane module exposed above the water surface can be adjusted. Utilizing the enhanced hydraulic shear force at the gas-liquid interface during rotation, the biofilm in the inner ring of the membrane module is effectively removed, enhancing the uniformity of biofilm removal from the MABR membrane element. By adjusting and controlling the rotation speed of the spiral rotary MABR membrane module, uniform mixing of wastewater in the reactor can be achieved, and the wastewater can be pushed along the axial direction of the membrane module. Through multi-point bottom water inlet, uniform water distribution and periodic pulse water inlet can be achieved, completing the uniform agitation of the bottom granular sludge zone.

The embodiment of the present application provides a kind of bacteria-algae symbiotic membrane aeration biofilm reactor and biofilm thickness control method, the bacteria-algae symbiotic membrane aeration biofilm reactor includes container, membrane component, carbon dioxide supply device, oxygen supply device and light source, membrane component is located in container, membrane component includes first membrane filament group and second membrane filament group arranged at intervals, carbon dioxide supply device is connected with the gas inlet of first membrane filament group, to provide carbon dioxide to first membrane filament group, carbon dioxide is connected with the gas inlet of second membrane filament group, to provide oxygen to second membrane filament group, light source irradiates first membrane filament group.The bacteria-algae symbiotic membrane aeration biofilm reactor of the embodiment of the present application has stronger sewage treatment effect.

This invention discloses a water treatment device and a wastewater treatment method. The water treatment device includes: a slurry bed membrane reactor with a reaction chamber inside and a drain outlet; a first inlet pipe connected to the slurry bed membrane reactor and connected in series with a first drive pump for transporting wastewater to the reaction chamber; an ozone generator for generating ozone; a gas membrane distributor arranged inside the reaction chamber and connected to the ozone generator for generating ozone micro-nano bubbles; a storage tank for storing a catalytic adsorbent configured to adsorb impurities in the wastewater and catalyze ozone decomposition; and a connecting pipe connecting the storage tank and the slurry bed membrane reactor for supplying the catalytic adsorbent into the reaction chamber. According to the water treatment device of this invention, deep treatment of wastewater can be achieved, reducing residue problems caused by chemical dosing at the source and avoiding secondary pollution caused by chemical agents, making the entire water treatment process more green and environmentally friendly.

The present invention addresses the problem of providing a separation membrane capable of selectively separating methanol with high efficiency from a gas containing carbon dioxide, hydrogen, and methanol. This separation membrane is provided with a separation layer containing MFI zeolite. In the MFI zeolite, the ratio I200 / I104 of the intensity I200 of a diffraction peak of a (200) plane to the intensity I104 of a diffraction peak of a (104) plane by X-ray diffraction measurement is 0.05-1.5, and the number-based cumulative particle diameter D50 at a cumulative number of 50% in a particle size distribution obtained by analyzing an image obtained by laser microscope observation is 2-10 µm.

The application provides a normal-pressure self-heat-supply dual-function membrane reactor and a method for simultaneously preparing propylene and methane, and belongs to the field of membrane reactors, wherein the normal-pressure self-heat-supply dual-function membrane reactor comprises a shell and a membrane assembly arranged in the shell; propylene is introduced into the shell from a feed port, and the reaction product after propylene dehydrogenation is discharged from a discharge port; the membrane assembly comprises a tubular ceramic membrane, both ends of the tubular ceramic membrane are connected to the outside of the shell, the outer wall of the tubular ceramic membrane and the inner wall of the shell form a first reaction cavity, the inside of the tubular ceramic membrane forms a second reaction cavity, propylene in the first reaction cavity is cracked into propylene and hydrogen, and the hydrogen enters the second reaction cavity through the tubular ceramic membrane; carbon dioxide and hydrogen perform a synthesis reaction in the second reaction cavity to release heat, and the heat is used for heat supply for dehydrogenation in the first reaction cavity. Compared with the prior art, the application solves the technical problems that the comprehensive energy consumption and cost of carbon dioxide utilization and propylene dehydrogenation are high and the two processes cannot be simultaneously performed.