124results about "Azeotropic distillation" patented technology

The invention provides a polymer devolatilization process and a devolatilization system. The devolatilization process comprises the following steps: heating a polymer raw material containing volatile components to obtain a molten polymer, pressurizing the molten polymer, mixing with an entrainer, and feeding into a falling film device; after sudden pressure drop and heating, the entrainer carries volatile components to be separated from the system, and a devolatilization product is obtained; the mass ratio of the polymer raw material to the entrainer is (10: 1)-(10000: 1). According to the polymer devolatilization process provided by the invention, the entrainer with a low boiling point is introduced into a reaction system, a large number of microbubbles are formed through vaporization of the entrainer and azeotropy of volatile components, removal of the volatile components in the material is enhanced through pressure swing flash evaporation, and extremely low pressure does not need to be reached in a devolatilization device.

The invention relates to a process for extracting alcohols from an initial mixture (1) comprising alcohols in aqueous phase, with:a distillative separation by an isopropanol-butanol distillation column (III) equipped at the top with a condenser (c3), intended for separating said mixture into a water-isopropanol azeotrope stream (6) at the top and into a water-butanol azeotrope stream (7) at the bottom,a distillative separation intended for separating the water-butanol azeotrope stream into water and butanol, by a hetero-azeotropic distillation system comprising at least one water-recovering water column (IV) and at least one butanol (9)-recovering butanol column (V) equipped with a reboiler (r5),such that a heat transfer is performed from the top water-isopropanol azeotrope stream (6) entering the condenser of the isopropanol-butanol distillation column (III), to the stream entering the reboiler of the butanol column (V).

The invention relates to a vinyl acetate refining system and method, and the system comprises: an azeotropic tower for extracting a vinyl acetate azeotrope from the top of the azeotropic tower, extracting a water-containing acetic acid material flow from the bottom of the azeotropic tower, and extracting an ethyl acetate material flow from the side line of the azeotropic tower; the azeotrope tower reflux unit is used for separating the vinyl acetate azeotrope into an azeotrope organic phase and an azeotrope water phase; the dehydration unit is used for carrying out light component and vinyl acetate separation on an azeotrope organic phase output by the azeotropic tower reflux unit, so as to realize light component recovery and vinyl acetate finished product recovery; the ethyl acetate treatment unit is used for carrying out ethyl acetate separation and vinyl acetate component recovery on the ethyl acetate material flow through the ethyl acetate treatment unit; and the vinyl acetate material flow output end of the ethyl acetate treatment unit is connected with the input end of the azeotropic tower, so that the vinyl acetate material flow flows back to the azeotropic tower. The method provided by the invention can realize separation of each component in the vinyl acetate crude product, significantly improves process stability, reduces separation difficulty, and reduces energy consumption at the same time.

The invention relates to the technical field of refrigerant raw material preparation, and discloses a novel energy-saving environment-friendly refrigerant raw material preparation system which comprises a raw material preparation and supply unit, a reaction and separation unit and a refining unit which are connected in sequence, the reaction and separation unit comprises a mixer, a reflux device, a reactor, a cooling separation device, a membrane type absorption device and a tail gas tower which are connected in sequence; the refining unit comprises an azeotropic tower, a rectifying tower I and a rectifying tower II which are connected in sequence, and is used for performing dehydration, deacidification and rectifying purification on the separated crude chlorinated liquid to obtain a high-purity carbon tetrachloride product; by optimizing the technological process of the raw material preparation and supply unit, the reaction and separation unit and the refining unit, efficient, environment-friendly and energy-saving production of carbon tetrachloride is realized; the problem that the production raw material carbon tetrachloride of the fourth-generation refrigerant is insufficient is solved, the production cost is reduced, and the production efficiency is improved.

The invention provides novel azeotrope-like compositions and separation processes utilizing the same. An azeotrope-like composition comprising 1,2-difluoroethylene (HFO-1132) and hydrogen fluoride. An azeotrope-like composition comprising 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride. A separation process for a composition comprising at least one member selected from the group consisting of trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), and 1,1,2-trifluoroethylene (HFO-1123) and hydrogen fluoride.

A production system, production method and application of general-purpose high-purity chemicals are disclosed. The production system includes a raw material tank, and an adsorption system, a crystallizer, a first light-impurity removal tower, a first heavy-impurity removal tower, a second light-impurity removal tower, a motorized tower, a second heavy-impurity removal tower, a vapor permeation device, a membrane separation system and a filling system connected with the raw material tank in sequence. The high-purity chemicals produced by the above system have high purity and excellent quality. Compared with the prior art, the system and method designed by the present disclosure have more pertinence, integrity, progressiveness, energy-saving, precision, high safety coefficient and great industrial promotion value. And the products produced are of excellent quality, which can meet the standards applied to the manufacturing of integrated circuit electronic components and meet the high-end needs of the semiconductor industry market.

The utility model provides an azeotropic-phenomenon-based rectifying tower high-efficiency dewatering device which comprises an azeotropic rectifying tower, a liquid inlet pipe is fixedly communicated with the upper position of the surface of the azeotropic rectifying tower, a gas inlet pipe is fixedly communicated with the lower position of the surface of the azeotropic rectifying tower, and the azeotropic-phenomenon-based rectifying tower high-efficiency dewatering device is arranged in the azeotropic rectifying tower and is used for full contact of gas and liquid. Raw materials are guided into the material mixing box from the feeding pipe and enter the upper position in the azeotropic rectifying tower through the liquid inlet pipe, entrainer enters the material mixing box through the feeding cover and the feeding opening, the cavity dividing blades rotate along the rotating shaft under the action of the raw materials, the interior of the material mixing box is divided into a plurality of cavities through the cavity dividing blades, and the entrainer enters the azeotropic rectifying tower through the liquid inlet pipe. The added entrainer uniformly falls into each cavity, so that the entrainer is prevented from being accumulated, the mixing effect is improved, and the mixing effect and the water blowing efficiency are further improved under the stirring rods of the cavity dividing blades.

The utility model belongs to the technical field of acrylic acid esterification reaction systems, and particularly relates to an air polymerization inhibition system for acrylic acid esterification reaction. The air polymerization inhibition system for the acrylic acid esterification reaction comprises a reaction kettle, an air inlet in the upper portion of the reaction kettle is connected with an air pipeline, the reaction kettle is provided with a pipeline connected with a dehydrating tower, the dehydrating tower is provided with a return pipeline connected with the reaction kettle, and the top of the dehydrating tower is connected with a reaction return tank through a first-stage condenser. The first-stage condenser is connected with the second-stage condenser; an air inward extending pipe is arranged at the air inlet of the reaction kettle, a double-layer distributor is arranged on the air inward extending pipe, and a stirrer is arranged in the reaction kettle. According to the air polymerization inhibition system for the acrylic acid esterification reaction, the double-layer distributor, the double-layer stirring paddle and the guide plate are arranged and matched with the optimized return pipeline, so that uniform dispersion and microbubbling of air are realized, the contact area and the contact efficiency of the air and materials are improved, the polymerization inhibition effect is enhanced, and the dosage of a chemical polymerization inhibitor is reduced.

This disclosure provides a method for efficiently purifying difluoromethane (HFC-32).Specifically, the present disclosure provides a method for producing a purified HFC-32, the method including:an extractive distillation step of contacting a composition containing difluoromethane (HFC-32) and a component X with a solvent A to obtain a composition containing a reduced component X from the composition,wherein the component X is at least one selected from the group consisting of pentafluoroethane (HFC-125), 1, 1, 1-trifluoroethane (HFC-143a), and dichlorodifluoromethane (CFC-12), andwherein the solvent A is at least one of an amine and a fluorinated ether.

The invention discloses a separation system and a separation method of a dichloromethane, ethanol and methanol aqueous solution multi-element azeotropic system. The separation system comprises three stages of rectifying towers connected in series; a reflux pipeline with a condenser is connected to a tower top extraction port of each stage of rectifying tower, and the reflux pipeline corresponding to the first stage of rectifying tower is also connected with a mixer for mixing tower top extraction substances of the first stage of rectifying tower with water and a phase splitter for separating oil and water in the mixer; a water phase outlet of the phase splitter and a tower kettle extraction opening of the first-stage rectifying tower are respectively connected with a feeding opening of the second-stage rectifying tower; a methanol extraction opening is formed in the side line of the second-stage rectifying tower; a tower kettle extraction opening of the second-stage rectifying tower is connected with a feeding opening of the third-stage rectifying tower; and a device for separating ethanol and water is connected to a tower top extraction port of the third-stage rectifying tower. The method provided by the invention can effectively separate the dichloromethane, ethanol and methanol aqueous solution multi-element azeotropic system, and the obtained dichloromethane, ethanol and methanol products have high purity.

The invention relates to a method and installation for recycling a mixture comprising at least one fluorinated fluid, the mixture comprising one or more fluorinated chemical components and one or more contaminants selected from one or more hydrocarbons and / or one or more fluorinated contaminants, including a double membrane filtration step to reduce the contaminant content of the mixture. Figure for the abstract: Figure 1

The invention provides a device and method for producing engineering plastics through continuous polymerization of a rubber solution, and the device comprises a direct rubber solution conveying system which is provided with a polymerization kettle; the premixing unit comprises a dynamic mixer and a premixing kettle; the solvent recovery system comprises a devolatilization tower and an azeotropic rectification tower; wherein the polymerization kettle is directly connected with the premixing unit through a thermal insulation pipeline. According to the invention, the glue solution is directly used for polymerization production of ABS or HIPS, and the cyclohexane solvent is refined and recycled, so that the problems of high energy consumption, low efficiency, complex flow, environmental pollution and the like in the traditional process can be solved.

The utility model provides a kind of for perchloromethylmercaptan purification azeotropic distillation device, belong to captan production technical field, including: distillation kettle and azeotropic rectification tower;The feed inlet of distillation kettle is connected with perchloromethylmercaptan storage tank, and the distillation outlet of distillation kettle upper portion is connected with carbon tetrachloride storage tank by vacuum pump, and the discharge port of distillation kettle bottom is connected with the feed inlet of azeotropic rectification tower by feed pump;The feed inlet of azeotropic rectification tower is also connected with dichloroethane storage tank;The bottom discharge port of azeotropic rectification tower is connected with captan synthesis kettle, and the top discharge port of azeotropic rectification tower is connected with azeotrope storage tank.This device can significantly reduce carbon tetrachloride content, process and simple operation, and the azeotrope used can be reused, and the carbon tetrachloride content in perchloromethylmercaptan after purification is reduced to below 100ppm, which can be directly sent into captan synthesis kettle to participate in synthesis reaction, so that it meets export standard.

This invention discloses a separation system for ethanol and acetal, comprising an acetal separation tower. The acetal separation tower has a raw material inlet and an azeotropic agent inlet on its wall. The raw material inlet is located in the middle of the tower wall, and the azeotropic agent inlet is positioned lower than the raw material inlet. An azeotropic agent recovery tower is connected to the top of the acetal separation tower, and both the acetal separation tower and the azeotropic agent recovery tower have outlets at their bottoms. This invention also discloses a method for separating ethanol and acetal using the aforementioned separation system. This invention uses acetonitrile as an azeotropic agent, obtaining high-purity acetal through one-step azeotropic distillation, and then separating the acetonitrile and ethanol through pressure swing distillation.

An object of the present invention is to provide a novel azeoropic or azeotrope-like composition that is effective for the separation of HF from 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene (HCO-1130(E)), or cis-1,2-dichloroethylene (HCO-1130(Z)). The object can be achieved by an azeotropic or azeotrope-like composition comprising HCC-140, HCO-1130(E), or HCO-1130(Z), and hydrogen fluoride.

The invention relates to the technical field of polyphenylene sulfide production, in particular to a device and a method for separating NMP (N-Methyl Pyrrolidone) and trichloromethane in a rectification process. The device comprises a first rectifying tower, a second rectifying tower, a third rectifying tower, a fourth rectifying tower, an NMP collecting tank, a first condensing device, a second condensing device, a third condensing device, a fourth condensing device, a first heating device, a second heating device, a third heating device and a fourth heating device. According to the method, trichloromethane is selected as an extraction agent, an NMP-containing oil phase obtained through extraction is subjected to four-stage rectification, and meanwhile, the temperature of a tower kettle of a rectification tower is controlled, so that decomposition of trichloromethane is inhibited, the pH value environment in the tower is controlled, equipment corrosion and generation of other organic impurities due to NMP hydrolysis are prevented, separation of NMP and trichloromethane is achieved through a low-temperature azeotropic control means, and the yield of NMP is increased. And carrying out system recycling on the separated NMP and trichloromethane.

According to the method for recovering the PGME and the PGIE from the HPPO process wastewater, the HPPO process wastewater is concentrated through the membrane separation device, the content of the PGME and the PGIE in the wastewater is greatly increased, and compared with the prior art, the energy consumption can be greatly reduced, the recovery efficiency can be improved, and the recovery cost can be reduced; 2-pentanone or 3-pentanone and a mixture of 2-pentanone and 3-pentanone are used as an azeotropic solvent to replace benzene, and the solvent circulation amount in the dehydration process can be reduced by 50% under the same pressure, so that the dehydration energy consumption is remarkably reduced, and the green and environment-friendly process requirements are met; the water layer of the dehydrated fraction is recycled into the HPPO process wastewater and then is subjected to membrane separation, so that the loss of trace PGME entrained in the dehydrated fraction can be avoided, and the yield of the PGME is increased; according to the technical scheme, the recovery rates of the PGME and the PGIE can reach 99%.

The application provides a device and method for continuously polymerizing rubber glue solution to produce engineering plastics, and the device comprises: a glue solution direct conveying system, which is provided with a polymerization kettle; a premixing unit, which comprises a dynamic mixer and a premixing kettle; and a solvent recovery system, which comprises a devolatilization tower and an azeotropic rectification tower; wherein the polymerization kettle is directly connected with the premixing unit through an insulation pipeline. Through the technical means of directly using the glue solution for ABS or HIPS polymerization production and refining and recovering cyclohexane solvent, the problems of high energy consumption, low efficiency, complex process and environmental pollution in the traditional process can be overcome.

The utility model belongs to the technical field of separation, and particularly relates to an ethyl acetate and butanone separation device, which comprises a butanone separation tower, an ethanol separation tower and an ethyl acetate separation tower which are connected in sequence, in the utility model, the tower top produced liquid of the ethyl acetate separation tower returns to the butanone separation tower, so that the purity of the product can be further improved; the gas phase of the butanone separating tower is used as a heat source of a reboiler at the bottom of the ethyl acetate separating tower, the gas phase at the top of the ethyl acetate separating tower is used as a heat source of a reboiler at the bottom of the ethanol separating tower, heat coupling can be realized between the rectifying towers with different operating pressures, the energy consumption in the rectifying and separating process is further reduced, and the method has higher operability.

The invention relates to the technical field of chemical engineering, and particularly discloses an anhydrous organic peroxy acid production system and method.The anhydrous organic peroxy acid production system comprises a peroxidation reaction distiller, a first oil-water separator, an azeotropic distillation tower and a second oil-water separation and light component removal tower, and moisture is brought out of a reaction system through two times of azeotropy and two times of oil-water separation; and the solvent and the entrainer are respectively recovered through the azeotropic distillation tower and the light component removal tower, and the recovered materials can be recycled. According to the present invention, with the method, the hydrogen peroxide conversion rate and the organic peroxy acid selectivity are high, the prepared anhydrous organic peroxy acid has characteristics of excellent quality and water content of less than 0.01%, and the process has advantages of short reaction time, high raw material utilization rate, high heat energy utilization rate and good economy.

The present invention provides a method for producing acrylic acid, the method including the steps of: supplying an aqueous lactic acid solution to a reactor and performing a dehydration reaction to obtain a first reaction product containing lactic acid, lactic acid dimer, water and acrylic acid; supplying the first reaction product to a first cooling tower and separating it into a lower fraction of the first cooling tower containing lactic acid and lactic acid dimer and an upper fraction of the first cooling tower containing water and acrylic acid; supplying the lower fraction of the first cooling tower to a lactic acid conversion tank and converting the lactic acid dimer to lactic acid to obtain a second reaction product; separating lactic acid from the second reaction product to recover lactic acid; and separating acrylic acid from the upper fraction of the first cooling tower to obtain acrylic acid.

The present disclosure relates to a method and a system for continuous regeneration of high-proof ethanol in a dry mill ethanol plant by a dual-rectification process that uses waste heat from the vacuum system, including routing azeotrope vapor comprising ethanol and water from the first rectifier to a molecular sieve vessel to produce pure, dry ethanol and routing the resulting regenerant to a second rectifier to produce a high-proof condensate that can be directly injected back into the MS vessel for an additional dehydration. The present invention also allows for simultaneous direct injection of azeotrope vapor from the first rectifier to the second rectifier to produce additional condensates that can be directly injected into the second rectifier for a continuous and cyclical feed-and-regeneration cycle for the production of pure, high-proof dry ethanol.

To provide a method for efficiently purifying difluoromethane (HFC-32).SOLUTION: The present disclosure provides a method for producing purified difluoromethane (HFC-32), the method including an extractive distillation step of bringing a composition containing HFC-32 and a component X into contact with a solvent A to obtain a composition where an amount of the component X is reduced from the composition. The component X is at least one selected from the group consisting of pentafluoroethane (HFC-125), 1,1,1-trifluoroethane (HFC-143a), and dichlorodifluoromethane (CFC-12), and the solvent A is at least one of an amine and a fluorinated ether.SELECTED DRAWING: None

A process apparatus for a distillation process comprises a distillation column (100) that processes material (104) of a mixture of water, at least acetic acid and formic acid and furfural, furfural being used as a former of azeotrope and an extractant in the mixture. A flowing material channel (102) is located between a lower section (106) of the column (100) and an upper section (108) of the column (100), the flowing material channel (102) comprising a solid material remover (110). A feed arrangement (112) is connected with the flowing material channel (102) between the lower section of the column (100) and the solid material remover (110). The flowing material channel (102) receives a stream of the processed material (104) from the lower section (106) of the column (100), a stream of precipitant from the feed arrangement (112), precipitation effect of the precipitant being based on water, and directs the mixture of the streams of precipitant and processed material (104) to the solid material remover (110), which removes solid material caused by the precipitant from the mixture. The flowing material channel (102) feeds a stream of the mixture, from which the solid material has been at least partly removed, to the upper section (108) of the column (100).

A method of purifying ethylenediamine includes the steps as follows. A phenyl compound is added into an ethylenediamine mixture solution, so as to obtain a mixture to be distilled, wherein the ethylenediamine mixture solution includes at least one of a first organic amine compound with a boiling point higher than ethylenediamine and a second organic amine compound with a boiling point lower than ethylenediamine, and the phenyl compound, ethylenediamine and water form an azeotrope. The mixture to be distilled is distilled under a distillation pressure, so as to obtain a low boiling point mixture, wherein the distillation pressure equals to or is smaller than a normal pressure. The low boiling point mixture is phase-separated and water is removed, so as to obtain a purified ethylenediamine product. A purity of the purified ethylenediamine product is larger than 99.5%.

The utility model discloses a system for separating n-butyl alcohol from water by using a rectification-membrane separation integrated process. The system comprises an azeotropic rectification tower, a reboiler, a NaA molecular sieve pervaporation membrane device, a reflux pump and an n-butyl alcohol extraction pump, a feeding pipeline is arranged in the middle of the azeotropic rectifying tower, a gas phase outlet pipe is arranged at the top of the azeotropic rectifying tower, and a discharging pipe is arranged at the bottom of the azeotropic rectifying tower; the NaA molecular sieve pervaporation membrane device is arranged at the tower top, azeotrope of n-butanol and water can be effectively separated, a traditional azeotropic distillation process and a novel molecular sieve membrane dehydration separation technology are combined, azeotropic limitation of the n-butanol-water mixture is effectively broken through, efficient recovery of the two substances is achieved, and the production cost is reduced. The system is energy-saving, environment-friendly, high in recovery rate, low in investment and suitable for industrial application and popularization.

The invention belongs to the technical field of chemical synthesis processes, and particularly relates to a continuous batching method for preparing polyphenylene sulfide, and the method comprises the specific steps of reactive monomer batching, azeotropic agent mixing, azeotropic distillation, azeotropic agent recovery and product delivery. The method has the advantages that the method is simple in process, high in production efficiency, stable in dehydration product quality and simple in process control, and a binary azeotropic system is formed by the aid of the method and a water phase, so that process energy consumption and NMP (N-methyl pyrrolidone) loss are reduced, batches have good uniformity, and continuous burdening is realized. The method has the advantages of simple procedures, high production efficiency, stable dehydration product quality and simplicity in process control.

The invention belongs to the technical field of glyceryl triacetate production and purification, and discloses a dehydration and deacidification device for glyceryl triacetate production, which comprises a treatment cylinder, a negative pressure pump fixed on the outer side of the treatment cylinder, and a condensation part arranged in the treatment cylinder, the condensation part comprises a cooling storage cavity, an isolation conduction plate, a condensation pipe and a through hole formed in the isolation conduction plate. According to the invention, depressurization distillation and azeotropic distillation are respectively adopted before and after, acetic acid removal and moisture removal are respectively completed, and directional deflection of the distribution condensation collection assembly is matched, so that products in two distillation treatment processes are successfully and effectively separated, independent separation and export of acetic acid removal are realized, and directional separation and collection of subsequent moisture are realized; the condition that acetic acid and water are mixed together after being separated is avoided, independent separation and export treatment is achieved, rapid export and separation are achieved through cooperation of the distribution condensation collection assembly and the distribution export assembly after separation, additional drainage operation is avoided, and the separation effect is good.

Impurities such as sulfur dioxide (SO2) are removed from trifluoroacetyl chloride (TFAC) through distillation, adsorption, or a combination thereof, and / or including the formation of an azeotrope or azeotrope-like composition including effective amounts of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC). The trifluoroacetyl chloride (TFAC) thus purified may then be used in the manufacture of trifluoroiodomethane (CF3I). Also disclosed are azeotropes and azeotrope like compositions of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC).

This disclosure provides a method for efficiently purifying difluoromethane (HFC-32). Specifically, the present disclosure provides a method for producing a purified HFC-32, the method including: an extractive distillation step of contacting a composition containing difluoromethane (HFC-32) and a component X with a solvent A to obtain a composition containing a reduced component X from the composition, wherein the component X is at least one selected from the group consisting of pentafluoroethane (HFC-125), 1,1,1-trifluoroethane (HFC-143a), and dichlorodifluoromethane (CFC-12), and wherein the solvent A is at least one of an amine and a fluorinated ether.