323results 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 the technical field of potassium tert-butoxide preparation, in particular to potassium tert-butoxide refining equipment which comprises a rectifying tower, a reboiler, a cooler and a phase splitter, the crystallization tower is located on the outer side of the rectifying tower, a rectifying chamber of the rectifying tower is connected with a crystallization chamber of the crystallization tower through the pre-filtering assembly, and the heater is installed at the bottom of the crystallization chamber of the crystallization tower; the input end of the low-pressure exhaust pipe is connected with the top of a crystallization chamber of the crystallization tower, the output end of the low-pressure exhaust pipe is connected with the input end of the cooler, the discharging pipe is installed on the side wall of the upper portion of the crystallization tower and communicated with the crystallization chamber of the crystallization tower, and the flashboard is inserted into the discharging pipe in a lifting mode. And the filter plate hopper is mounted in a crystallization chamber of the crystallization tower in a lifting and sliding manner. The azeotropic distillation kettle liquid can be subjected to efficient evaporation drying, redispersion, cooling crystallization and other processes after azeotropic distillation, potassium tert-butoxide can be efficiently discharged, and the practicability is good.

Processes and systems for producing recycled content polyethylene terephthalate (r-PET) are provided. Integration of chemical recycling facilities with PET production facilities reduces energy consumption and helps minimize adverse environmental impacts, while providing valuable end products having up to 100 percent recycled content.

The invention relates to the technical field of dehydration and regeneration methods of water-containing ethylene glycol rich liquor, in particular to an ethylene glycol dehydration and regeneration process and device adopting azeotropic distillation, in the ethylene glycol dehydration and regeneration process adopting azeotropic distillation, fuel gas is adopted as an entrainer of ethylene glycol rich liquor water, so that the boiling point of azeotrope in an ethylene glycol reboiler is reduced. Compared with an existing conventional ethylene glycol rich solution distillation regeneration process, under the condition that the same ethylene glycol barren solution regeneration concentration is achieved, the regeneration temperature is reduced by at least 30 DEG C, heating through a low-frequency electromagnetic heater can be achieved, and heating is safer and more reliable compared with heating through a traditional resistance heater; the regeneration energy consumption is reduced by about 10%, no regeneration tail gas is discharged, the VOCs discharge amount is zero, and the method has the advantage of environmental protection.

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 utility model discloses rectification equipment for removing light components from MIBK (methyl isobutyl ketone), and belongs to the technical field of chemical rectification. A rectifying tower of the rectifying equipment comprises a tower body with a cylindrical barrel structure, and a vertical partition plate is arranged in the tower body and divides the rectifying tower into a first pre-fractionation section, an azeotrope rectifying section, a stripping section, a second pre-fractionation section and an acetone rectifying section. By adopting the rectification equipment, an organic matter mixed solution containing light components such as 2-MPA and acetone from an MIBK synthesis system can be rectified, extracted and separated. A target product 2-MPA debounded region is obtained in the extraction section; a target product diacetone obtained in an acetone rectifying section of the rectifying tower is directly returned to an MIBK synthesis system as a raw material for use; a target product tri-MIBK solution obtained in the stripping section of the rectifying tower is subjected to boundary region rectification, and MIBK is separated. By utilizing the rectification equipment, the quantity of equipment can be reduced, the process flow is simplified, the device investment is reduced, the consumption of raw materials and energy in production is reduced, the production cost is reduced, and the carbon emission of a production device is reduced.

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.

A reactive distillation system for decomposition of hydriodic acid into hydrogen gas and iodine, with optional secondary purification unit(s) is described. Methods for using the reactive distillation system with optional secondary purification unit(s) for the decomposition of hydriodic acid into hydrogen gas and iodine is also described. When the purification unit is present, the system and methods of the disclosure can be used for the production and purification of hydrogen from hydriodic acid.

Processes and systems for producing recycled content polyethylene terephthalate (r-PET) are provided. Integration of chemical recycling facilities with PET production facilities reduces energy consumption and helps minimize adverse environmental impacts, while providing valuable end products having up to 100 percent recycled content. Additionally, processes and systems described herein may provide high IV, crystalline PET based on dimethyl terephthalate, which can exhibit desirable properties during molding and other end use applications.

Processes and systems for producing recycled content polyethylene terephthalate (r-PET) are provided. Integration of chemical recycling facilities with PET production facilities reduces energy consumption and helps minimize adverse environmental impacts, while providing valuable end products having up to 100 percent recycled content. Additionally, processes and systems described herein may provide high IV, crystalline PET based on dimethyl terephthalate, which can exhibit desirable properties during molding and other end use applications.

The present invention relates to a process for producing trifluoroethylene in a reactor having a fixed catalyst bed comprising a catalyst, the process comprising the steps of: a) reacting chlorotrifluoroethylene with hydrogen in an aqueous phase in the presence of a catalyst to produce a stream A comprising trifluoroethylene; b) treating said stream A under conditions sufficient to produce a stream D1 comprising 1,1,2-trifluoroethane with a content of less than 15% by weight, based on the total weight of stream D1; and c) recycling stream D1 to step a).

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 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 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.

The present invention belongs to the technical field of chemical production, and particularly relates to an ODS recovery device and method, wherein the equipment comprises: a bracket, which is used for overall fixing of the device; a mixing cylinder, which is arranged at the upper end of the bracket and is used for mixing ODS and a fractionation reagent; a stirring component, which is used for stirring during extraction; a flow interception component, which is used for dripping ODS; a spray mechanism, which is arranged in the middle of the mixing cylinder and consists of an intermittent component, an intermittent mechanism, and a connecting component, and is used for atomizing, spraying and mixing the extraction reagent; a fractionation tower, which is used for azeotropic distillation of the mixed ODS; through the intermittent component, when the mixed spraying of the ODS solvent is carried out, the chamber is sealed by the slide rod and the partition plate, and the spring sleeved in the slide rod is used, and the intermittent opening and closing of the intermittent component is completed by combining the arc block and the arc surface between the arc blocks for inclined transmission; the stirring component is then used to realize stirring through belt transmission, and when the belt transmission is overloaded, the belt slips to protect the transmission end.

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 invention belongs to the technical field of separation, and particularly relates to a separation process of ethyl acetate and butanone, which comprises the following steps: a butanone-ethyl acetate-ethanol mixture to be treated enters the middle part of a butanone separation tower, liquid produced from the top of the butanone separation tower is continuously introduced into an ethanol separation tower, and a butanone product is continuously produced from the bottom of the butanone separation tower; continuously introducing tower top produced liquid of the ethanol separation tower into an ethyl acetate separation tower, and continuously producing an ethanol product from the tower bottom of the ethanol separation tower; liquid produced from the top of the ethyl acetate separation tower returns to the butanone separation tower, and ethyl acetate products are continuously produced from the bottom of the ethyl acetate separation tower. According to the method, the ethanol is introduced as an entrainer, the azeotropic ratio of the ethanol to the ethyl acetate and the butanone is obviously changed by changing the operation pressure, and the operation is performed in different rectification areas generated under different pressure conditions, so that the operation difficulty of direct pressure swing rectification separation of the ethyl acetate and the butanone is reduced, and the separation of the ethyl acetate and the butanone is realized.

The invention relates to an apparatus for carrying out mass transfer processes, comprising a column having at least two inlet pipes for introducing a gaseous phase, where separation-active internals are accommodated in the column and a column section extends from the at least two inlet pipes to the separation-active internals, in which section a coverage of a cross-sectional area of the column is less than 25%, based on the total cross-sectional area, and where the at least two inlet pipes have a height offset which corresponds to not more than three times an inlet pipe diameter and the at least two inlet pipes are at an angle (α) of from 60° to 150° to one another and have asymmetry with respect to one another. The invention further relates to a use of the apparatus and also a method for designing the apparatus.

The utility model discloses rectification equipment and a rectification system for MIBK (methyl isobutyl ketone) rectification, and belongs to the technical field of chemical rectification. The rectification equipment for MIBK rectification comprises a rectification tower, the rectification tower comprises a tower body of a cylindrical barrel structure, and vertical partition plates are arranged in the tower body and divide the rectification tower into a pre-fractionation section, a rectification section, a stripping section and a middle discharging section. By adopting the rectifying tower, an MIBK solution which is from an MIBK light component removal system and does not contain light components but contains heavy components and water can be rectified and separated. Removing organic water in the rectifying section of the rectifying tower; heavy components are removed at a stripping section of the rectifying tower; a target product-MIBK is obtained at a middle discharging section of the rectifying tower. By utilizing the rectifying tower, the quantity of equipment can be reduced, the process flow is simplified, the device investment is reduced, the raw material and energy consumption in production is reduced, the production cost is reduced, and the carbon emission of a production device is reduced.

The present invention relates to the field of chemical synthesis technology, and in particular to a 2-ethylanthraquinone synthesis production line. According to the order of synthesis, it includes an acylation hydrolysis reaction module, a precipitation and dehydration module, a closed-loop reaction module, a crude product cleaning and separation module, and a crude product refining module connected by pipelines; acylation and hydrolysis are first completed inside the acylation hydrolysis reaction module. Then enter the precipitation and dehydration module for precipitation and dehydration, and then enter the closed-loop reaction module to complete the closed-loop reaction. After the closed loop is completed, enter the crude product cleaning and separation module for alkali washing separation and water washing separation to obtain a crude product, and these crude products finally enter the crude product refining module for refining to obtain a final product. The synthesis production line of the present invention has a simple structure, can be reacted using a solid catalyst, is more environmentally friendly, and has lower cost.

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.

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 method for producing purified isopropyl alcohol by dehydrating crude isopropyl alcohol containing water as an impurity, comprising: storing a mixture of the crude isopropyl alcohol and an azeotropic agent in a phase separation tank, and subjecting the mixture to phase separation into an upper phase liquid containing the azeotropic agent, water and isopropyl alcohol and a lower phase liquid containing water; azeotropically distilling the upper phase liquid in an azeotropic distillation column to extract a distillate containing an azeotropic mixture of the azeotropic agent and water and a bottoms liquid containing isopropyl alcohol; and supplying the distillate to the phase separation tank. A method for producing purified isopropyl alcohol is provided.

Provided is a method for producing purified isopropyl alcohol by dehydrating crude isopropyl alcohol containing water as an impurity, the method comprising: a phase separation step in which a mixed liquid of the crude isopropyl alcohol and an azeotropic agent is accommodated in a phase separation tank and phase-separated into an upper-phase liquid containing the azeotropic agent, water, and isopropyl alcohol and a lower-phase liquid containing water; and an azeotropic distillation step in which the upper-phase liquid is subjected to azeotropic distillation in an azeotropic distillation column, and a distillate containing an azeotropic mixture of the azeotropic agent and water and a bottom product containing isopropyl alcohol are extracted, wherein the distillate is supplied to the phase separation tank.

The invention relates to a production system and method of electronic-grade propylene glycol monomethyl ether. The production system comprises a primary rectifying tower (1), a secondary rectifying tower (2), a first micro-filter (3), a first anion and cation remover (4), a primary dehydrating tower (5), a secondary dehydrating tower (6) and a nano-filter (7) which are sequentially connected in series in the direction from industrial-grade propylene glycol monomethyl ether feeding to electronic-grade propylene glycol monomethyl ether discharging. And the first-stage dehydrating tower (5) and the second-stage dehydrating tower (6) are connected with an entrainer adding mechanism and an entrainer reflux mechanism. Compared with the prior art, the electronic-grade propylene glycol monomethyl ether production system provided by the invention has the advantages that not only are organic impurities and zwitterions in the product of the system reach the electronic grade, but also the water content in the product also reaches the electronic grade requirement by a method of adding the entrainer, and the yield of the final product is 90% or above.

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.

The utility model discloses a water removal system for a reaction system. The water removal system comprises a reactor, a solvent storage tank, a constant-temperature heat tracing jacket, a stirrer, an oil-water separator, a gravity sensor, a condenser and a water collection tank, the gas phase outlet is communicated with an inlet of the oil-water separator through a pipeline, a gas phase outlet in the top of the oil-water separator is communicated with a gas inlet of the condenser through a pipeline, and a liquid outlet of the condenser is communicated with the inlet of the oil-water separator through a pipeline; a liquid phase outlet in the bottom of the oil-water separator is communicated with an inlet of the water collecting tank through a pipeline; and a water distribution switch is arranged at a liquid phase outlet of the oil-water separator. The solvent which does not participate in the reaction and has a boiling point similar to that of water is added into the reactor through the solvent storage tank, and the water can be discharged out of the reactor in time in the reaction process by utilizing the principle that the solvent and the water are azeotropic, so that the hydrolysis reaction is prevented, the pressure in the reactor can be prevented from being too high, the product yield can be improved, and the production cost is reduced. The usage amount of raw materials is further reduced.

The present invention is a method for evaporation and concentration of a radioactive metal nuclide, which comprises the following steps: a first evaporation and concentration step of heating a radioactive solution obtained by dissolving a radioactive metal nuclide in an acidic aqueous solution to evaporate the solvent in the radioactive solution, thereby obtaining a concentrated solution of the radioactive metal nuclide; and a second evaporation and concentration step of adding a low-boiling organic solvent having a boiling point lower than that of water to the concentrated solution and heating the mixture to cause the low-boiling organic solvent and the concentrated solution to azeotrope, thereby obtaining an evaporation concentrate of the radioactive metal nuclide. According to the present invention, it is possible to perform the treatment from separating the radioactive metal nuclide from the radioactive solution obtained by dissolving the radioactive metal nuclide in the acidic aqueous solution to reacting it with the labeling target compound to generate a radioactive label without manual operation.