15 results about "Relative volatility" patented technology

The utility model discloses a kind of deuterium water distillation preparation devices, belong to deuterium water distillation technical field, comprising: retort, the bottom of retort is fixedly connected with heating layer;Multi-stage pressure control mechanism, be in retort, to, the pressure control in retort, multi-stage pressure control mechanism includes inner tank ring, outer tank ring, two groups of through-hole and pressure control pump.The deuterium water distillation preparation device, by the use of multi-stage pressure control mechanism, can control the pressure inside retort gradually reduce, using boiling point difference amplification effect, the relative volatility of H2O and D2O is improved from 1.01 to 1.05, significantly reduce energy consumption, improve use effect, the deuterium water distillation preparation device, by the use of control mechanism, can operate multi-stage pressure control mechanism to use, and, the whole structure is simple, use same structure, control first sealing ring and second sealing ring respectively rotating, complete closed use, improve flexibility in use process.

The invention belongs to the technical field of chemical separation, and discloses a separation method of a high-boiling-point component in high-carbon aldehyde production. The method is characterized in that 0.05%-2.0% of functional ionic liquid is added into a rectification system, and the apparent vapor pressure of impurities is directionally inhibited and the relative volatility is remarkably improved by utilizing the selective hydrogen-bond interaction between anions of the functional ionic liquid and hydroxyl / carbonyl in the impurities. According to the method, the ionic liquid with a molecular recognition function is introduced, the phase equilibrium relation between the high-carbon aldehyde and the high-boiling-point impurities is reconstructed from the thermodynamic essence level, the inherent limitation that traditional rectification depends on weak physical property differences is broken through, efficient, low-energy-consumption and high-stability purification of the high-carbon aldehyde product is achieved, the ionic liquid can be recycled, and the method is suitable for industrial production. The invention provides a novel high-carbon aldehyde purification method which has the advantages of novel principle, simplicity and convenience in operation, high efficiency, energy conservation and industrial feasibility.

The invention discloses an MTO-grade methanol production process system and a process method thereof. The process system comprises a compressor, a first methanol synthesis tower, a first separator, a second methanol synthesis tower, a second separator, a light component removal tower, a multi-stage vaporizer and a heavy component removal tower. According to the process system, heat of synthesized methanol gas is coupled to the gas-gas heat exchanger, the light component removal tower reboiler and the vaporizer through reasonable heat exchange and utilization, low-grade heat is fully utilized, and energy consumption and production cost are reduced. According to the process method, the high relative volatility between the wax and the methanol and between the metal ions and the methanol is fully utilized, the wax and the metal ions in the methanol are thoroughly removed through staged vaporization of the multi-stage vaporizer in cooperation with the de-heavy tower, the content of the wax is lower than 30 ppm, the content of the metal ions is lower than 0.1 ppm, and the requirement for MTO-grade methanol is met.

This invention discloses a refining process and equipment for high-concentration sulfur dioxide byproducts of chemical production tail gas, relating to the field of chemical tail gas treatment and resource recovery technology. The process includes pretreatment, adsorption and regeneration, extractive distillation, double-effect distillation, and finished product collection. In this invention, micro-oxygen pre-removal utilizes the reaction of sodium bisulfite with oxygen to remove trace amounts of oxygen from the tail gas. Simultaneously, the crystals precipitated from the reaction capture residual micron-sized acid mist, blocking the sulfite oxidation side reaction at its source and preventing equipment scaling and clogging. Gradient reverse adsorption changes the gas flow direction, matching different concentrations of impurities to corresponding adsorbents, achieving synchronous saturation of each adsorption layer and improving adsorbent utilization. Pressure swing extractive distillation sets different pressure ranges within a single tower to increase the relative volatility of carbon disulfide and sulfur dioxide, enhancing the separation of difficult-to-separate impurities. Finally, a four-stage separation system is constructed to remove impurities of different properties at each stage for progressive depth removal.

The invention relates to the technical field of trioxymethylene production, and discloses a composition for trioxymethylene and a method for synthesizing trioxymethylene. The composition contains a formaldehyde aqueous solution, an acid catalyst and a catalytic promoter, in the formaldehyde aqueous solution, the content of formaldehyde is 28-75wt%, the content of methanol is 0.5-3wt%, and the content of formic acid is 0.02-0.5 wt%; the acid catalyst is sulfuric acid of which the concentration is not lower than 90wt%; relative to 1kg of the formaldehyde aqueous solution, the content of the acid catalyst is 0.3 to 1.0 mol, and the content of the catalytic promoter is 0.3 to 2.0 mol. According to the scheme, the activity of water in the formaldehyde aqueous solution can be reduced, and the relative volatility of the product trioxymethylene and water can be improved, so that the generation of a byproduct formic acid is reduced, and the conversion rate of formaldehyde and the yield of trioxymethylene are improved.

According to the present invention, the high-purity separation and recovery of the allyl acetate-allyl alcohol-water azeotrope are achieved by using the ionic liquid-based continuous production heat integration auxiliary integrated reaction rectification apparatus, and the separation is achieved by using the characteristic that the extraction agent has the large influence on the relative volatility of the allyl acetate-allyl alcohol-water azeotrope. The purity of the separated allyl acetate and allyl alcohol reaches 99.9% or above, high-purity recycling and reusing of the extraction agent can be achieved, the separation cost is greatly reduced, and the method is low in energy consumption and flexible to operate.

The invention relates to the technical field of C8 aromatic hydrocarbon separation, and discloses compound slurry, application thereof and a method for separating ethylbenzene and p-xylene from C8 aromatic hydrocarbon. The compound slurry comprises first slurry and second slurry; the first slurry comprises an m-xylene adsorbent and a first liquid-phase medium; the second slurry comprises a p-xylene adsorbent and a second liquid-phase medium; wherein the m-xylene adsorbent is a metal organic framework material; the p-xylene adsorbent is an X-type molecular sieve. The compound slurry effectively improves the relative volatility between C8 aromatic hydrocarbon raw materials, is used as a separating agent for separating ethylbenzene and p-xylene from C8 aromatic hydrocarbon, effectively separates ethylbenzene and p-xylene at the same time through the coupling effect of adsorption and rectification, and is low in energy consumption.

The utility model provides a system for recycling heavy oil in cyclohexanone production, the system comprises a heavy oil coalescer, a heavy oil separator and the like, DMAC is added into heavy oil, so that the relative volatility of methylcyclopentane and cyclohexanol in the heavy oil can be improved, rectification separation of cyclohexanol is facilitated, cyclohexanol is convenient to recycle, the utilization rate of cyclohexanol is improved, and the enterprise cost is reduced. The pressure in the heavy oil separator can be reduced by using the two parallel vacuum pumps and the two parallel compressors, so that the boiling point of heavy oil in the heavy oil separator is reduced, and rectification separation is facilitated; and meanwhile, the use amount of 1.2 MPa live steam is also saved. The mixed steam compressed by the compressor is introduced into the second reboiler or the third reboiler according to different temperatures of the mixed steam, so that heat is provided for the heavy oil separator, meanwhile, the energy of the secondary steam is reasonably utilized, and the use amount of 1.2 MPa live steam is further saved.

The utility model discloses an F22 / HFP azeotrope extraction and separation device which comprises an absorption tower, the absorption tower is provided with an absorption tower top condenser, an azeotrope feeding pipeline, an HFP discharging pipeline and an extraction agent discharging port, the extraction agent discharging port is communicated with a desorption tower condenser through a pipeline, the pipeline is provided with a circulating pump, the desorption tower condenser is communicated with a desorption tower through a pipeline, and the desorption tower is provided with a circulating pump. The desorption tower is communicated with a desorption tower condenser through a pipeline, the desorption tower condenser is communicated with an absorption tower cooler through a pipeline, the absorption tower cooler is communicated with an extracting agent feeding hole of the absorption tower through a pipeline, and two heat exchange pipelines in the desorption tower condenser are used for exchanging heat; a gas-phase material outlet of the desorption tower is communicated with a tower top condenser of the desorption tower, the tower top condenser of the desorption tower is communicated with a gas-phase material inlet of the desorption tower through a material return pipeline, and the material return pipeline is provided with an F22 discharge pipeline. According to the extraction separation device disclosed by the utility model, materials containing F22 / HFP are conveyed to the absorption tower, the relative volatility among components in an original mixture is changed by adding the extraction agent, and the absorbed F22 and HFP are released from the absorption agent in manners of heating, pressure reduction and the like and are recycled, so that efficient separation is realized, the production efficiency is further improved, and the production cost is reduced. The production cost is reduced.

The present application belongs to the field of chemical separation technology, and discloses a separation method of high-boiling-point components in high-carbon-aldehyde production. The method is characterized in that 0.05%-2.0% of functional ionic liquid is added in a rectification system, and the selective hydrogen bond effect of the anion thereof on the hydroxyl group / carbonyl group in impurities is utilized to directively inhibit the apparent vapor pressure of the impurities and significantly improve the relative volatility. The present application reconstructs the phase equilibrium relationship between high-carbon-aldehyde and high-boiling-point impurities from the thermodynamic essential level by introducing ionic liquid with molecular recognition function, breaks through the inherent limitation of traditional rectification which relies on weak physical property difference, realizes efficient, low-energy-consumption and high-stability purification of high-carbon-aldehyde product, and the ionic liquid can be recycled, has environmental friendliness and economy, and provides a novel-principle, simple-operation, efficient and energy-saving and industrial-feasible new method for high-carbon-aldehyde purification.

The invention relates to the field of material science and engineering, and particularly discloses a preparation process of vinyl ethyl ether. The process comprises the following steps: conveying acetylene and an ethanol catalyst solution into a micro-packed bed reactor for continuous gas-liquid reaction, carrying out gas-liquid separation on a reaction solution, feeding the reaction solution into an extractive distillation tower, carrying out separation and purification under the action of an extraction agent, strengthening gas-liquid mass transfer by using a micropore structure of a micro-packed bed, and realizing efficient conversion under mild pressure, the acetylene explosion risk is obviously reduced; the residence time is accurately controlled, so that acetalation and self-polymerization side reactions are effectively inhibited, and the problem of scaling of the reactor is solved; besides, the relative volatility of components is changed by utilizing an extractive distillation technology, an azeotropic system of vinyl ethyl ether and ethanol is broken, and a product with higher purity can be directly obtained without water washing; according to the process, the problems of poor mass transfer, low safety and difficulty in azeotropic separation of a traditional kettle method are solved, and intrinsically safe and stable production is realized.

The application provides a method for separating cyclohexanol and phenol by extractive rectification, relates to the field of chemical separation technology, and selects alcohol solvents such as ethylene glycol as extractants for extractive rectification, changes the relative volatility among components, effectively overcomes the defect that the conventional rectification technology is difficult to separate due to the highest azeotropic point of cyclohexanol and phenol, and can obtain cyclohexanol and phenol products with high purity and high yield. The purity of the cyclohexanol product is greater than or equal to 99.5 wt%, the purity of the phenol product is greater than or equal to 99.95 wt%, and the product yield is greater than or equal to 98%. The separation process is simple and efficient, the solvent can be recycled, and the method has good economic benefits and application prospect.

The invention discloses a multi-stage gradient distillation impurity removal device for germanium purification and a purification method, and relates to the technical field of rare metal purification. Through the multi-stage gradient design of first-stage distillation, second-stage re-distillation arsenic removal and third-stage rectification, a directional and synergistic separation mechanism based on the physical and chemical property difference of impurities is constructed; the first-stage distillation unit selectively volatilizes part of impurities with lower boiling points preferentially by controlling lower temperature and pressure, and high-boiling-point metal chlorides are retained at the bottom of a kettle due to insufficient saturated vapor pressure, so that first-stage crude separation is realized, and the second-stage re-distillation arsenic removal unit introduces chlorine gas, so that the high-boiling-point metal chlorides are separated from the bottom of the kettle; the three-stage rectification unit is used for oxidizing volatile arsenic impurities into non-volatile arsenic acid in situ, targeted chemical fixation and separation are realized, and the three-stage rectification unit is used for ultimate fine separation of trace impurities with similar boiling points on the basis of removal of high-boiling-point and specific impurities in the first two stages, so that fine separation based on relative volatility is realized.

The application discloses a limonene extraction agent in tire pyrolysis oil, wherein 30-60wt% p-aminoacetanilide and 40-70wt% quinoline are contained in the extraction agent; the extraction agent changes the interaction force between substances by itself group, and then changes the relative volatility between key components, so that the limonene product can reach more than 95% of industrial grade purity, and the yield of the limonene product also reaches more than 85%.

The invention relates to a method for extracting, rectifying and separating vinyl acetate, methyl acetate and water by using a mixed extracting agent, which utilizes the characteristic that a vinyl acetate-methyl acetate-water azeotropic system changes the intermolecular relative volatility along with the addition of the mixed extracting agent, and through the three-tower operation of a rectifying tower (T1), a rectifying tower (T2) and a rectifying tower (T3), the content of the methyl acetate in the water is reduced. The method realizes efficient separation of the ternary mixture, the molar fraction of the separated vinyl acetate is greater than 99.99%, the molar fraction of the separated methyl acetate is greater than 99.99%, and the molar fraction of the separated water is greater than 99.99%. The method solves the problem that the azeotropic system is difficult to separate by using common rectification, is flexible to operate, is economical and environment-friendly, and can realize effective separation of the ternary azeotropic mixture through three towers.