2118results about "Distillation purification/separation" patented technology

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

A process for distilling a raffinate 2 stream as feed stream in at least two distillation columns DK1 and DK2 has two different inlets for the feed stream in at least the distillation column DK1. It is a feature of the process that the feed stream is analysed for its composition before being introduced; and one of the at least two inlets for the feeding of the feed stream is chosen depending on the composition of the feed stream.

A method for producing hydrocarbons includes subjecting a first feed stream to steam cracking to obtain a first product stream, and subjecting an ethane-containing second feed stream to oxidative dehydrogenation to obtain a second product stream. A portion of the first product stream is subjected to a deethanization or a depropanization separately from the second product to obtain a lighter fraction and a heavier fraction. A demethanization feed stream is formed by combining at least a portion of the lighter fraction and at least a portion of the second product stream and is subjected at least in part to demethanization. Partial oxygen removal is carried out during the formation of the demethanization feed stream. The oxygen removal is carried out downstream of the combining step.

A method for producing one or more hydrocarbons, includes subjecting a first feed stream to a steam cracking to obtain a first product stream and subjecting a second feed stream containing ethane to an oxidative dehydrogenation to obtain a second product stream At least a portion of the first product stream is subjected to a treatment to obtain hydrocarbon fractions. The treatment includes a selective hydrogenation of hydrocarbons having two carbon atoms and a demethanization. At least a portion of the second product stream is subjected to a trace removal, which comprises the removal of oxygen and / or acetylene, to obtain an subsequent stream. At least a portion of the subsequent stream is fed to the treatment at a position downstream of the selective hydrogenation and upstream of the demethanization. A portion of the subsequent stream is subjected to a carbon dioxide removal upstream of the feed point into the treatment.

The invention provides a continuous rectification recovery process of 1, 2-butadiene, which comprises the following steps: preheating a heavy C4 raw material and an extraction agent, feeding the preheated heavy C4 raw material and extraction agent into an extractive distillation tower, steaming out a light component A from the tower top, condensing, and returning to the tower top as reflux; the heavy component A is rectified in an extractant separation tower, a light component B is distilled out from the tower top, part of the light component B returns to serve as reflux, and the other part of the light component B enters a heavy component removal tower; the heavy component B returns to the extractive distillation tower through the heat exchanger. After heavy components of the light component B are removed in the heavy component removal tower, the light component C is evaporated out from the tower top, condensed and fed into a 1, 2-butadiene storage tank. And the heavy component C finally flows into a waste liquid tank. Wherein the heavy C4 raw material and the extraction agent are preheated by a heat exchanger, and the heat exchanger uses the heavy component B as a heat source. By providing a simple, feasible, economical and efficient continuous extractive distillation process, high-purity 1, 2-butadiene can be efficiently recovered from heavy C4 byproducts of a 1, 3-butadiene extraction device, and the content of the 1, 2-butadiene can reach 97%.

A process for producing hydrocarbons, usable as fuels, from industrial, agroforestry, urban waste and derivatives thereof, with high sustainability and lower CO2 emissions, given the same energy, with respect to the equivalent fuels of fossil origin, by means of a series of subsequent conversions in which first a syngas is produced,, obtained by gasification of waste with oxygen at high temperature, which is purified and adjusted in composition by modulating the H2 / CO ratio and then converted into methanol. The methanol obtained is in turn catalytically converted into light olefins by means of methanol -to- propylene (MTP) technology; such olefins are catalytically converted by oligomerization in order to obtain a hydrocarbon mixture comprising an ultra-light fraction (C1 and C2 ), a light fraction (C3 and C4), a fraction with a boiling range from 60 to 300°C, and a fraction with a boiling temperature above 300°C to be used for product separation and fractionation treatments.

The invention relates to a method and a process for separating isopropanol-isooctane by using an N, N-dimethylacetamide (DMAC) organic extraction agent. The process is composed of an extractive distillation tower and a solvent recovery tower. According to the method, N, N-dimethylacetamide is used as an extraction agent, isopropanol-isooctane firstly enters an extractive distillation tower for extraction separation, high-purity isopropanol is obtained at the top of the extractive distillation tower, and materials at the bottom of the tower enter a solvent recovery tower for separation. High-purity isooctane is obtained at the top of the solvent recovery tower, and an extracting agent DMAC is obtained at the bottom of the solvent recovery tower. The method has the advantages of low energy consumption, simple process, convenience in operation, greenness, energy conservation, high purity of separated products and the like, and the adopted extracting agent N, N-dimethylacetamide is good in stability, non-toxic, low in corrosivity and environment-friendly.

The utility model discloses a heat energy utilization system of a C3 and C4 mixed dehydrogenation device, and relates to the technical field of heat energy utilization. According to the utility model, heat generated by a heat pump compressor is respectively used as a heat source of materials extracted from the side lines of a propane tower reboiler and a C3 and C4 separation tower A, heat of an aromatic solvent pipe system is used as a heat source of the reboiler of the C3 and C4 separation tower A, and heat of materials at the bottom of a C3 and C4 separation tower B is used as a heat source to exchange heat with materials at the inlet of the C3 and C4 separation tower A; surplus heat of the dehydrogenation device is fully utilized, steam consumption is reduced, and the purpose of saving energy is achieved.

Processes and systems for making recycle content hydrocarbons, including olefins, from recycled waste material. Recycle waste material may be pyrolyzed to form recycle content pyrolysis oil composition (r-pyoil), at least a portion of which may then be cracked to form a recycle content olefin composition (r-olefin). The r-olefin may then be further separated into product streams in a separation zone downstream of the cracker furnace. The presence of recycle content hydrocarbons may facilitate more efficient operation of one or more distillation columns in the separation zone, including the propylene fractionator.

The invention relates to the field of separation and purification, and discloses a norbornene separation and purification method and system. The method provided by the invention is suitable for separation and purification of the norbornene synthesis liquid obtained by a solvent method, high-purity norbornene can be obtained in two steps, and meanwhile, a solvent which can be reused in a norbornene synthesis process can be directly obtained. According to the method, high-purity norbornene suitable for COC synthesis can be obtained at a high yield, and the method has the advantages of being short in technological process, high in resource utilization rate, reliable in process, easy to manage, easy to industrially popularize and the like.

The invention belongs to the technical field of bioengineering, and particularly relates to a preparation process of nanoscale water-soluble squalene. Comprising the following steps: S1, treating corn flour, adding pure water, and performing enzymolysis by adopting compound enzyme to obtain corn saccharified liquid for later use; s2, inoculating saccharomyces cerevisiae GS-A3 into a culture medium containing the corn saccharification liquid, and fermenting; s3, centrifuging the fermentation liquor, and extracting by adopting supercritical CO2 to obtain a squalene crude product; and S4, carrying out nanocrystallization treatment after molecular distillation treatment. According to the method, corn is taken as a raw material, rich starch resources are utilized, the corn is converted into glucose through enzymolysis, squalene is generated in saccharomyces cerevisiae through an MVA way, high-yield and high-purity squalene is prepared, the stability of squalene is improved through a special nanocrystallization treatment mode, the storage life of squalene in the application process is prolonged, and the method is suitable for industrial production. And the bioavailability can be obviously improved. In addition, the technology used in the invention meets the requirements of green and environmental protection.

The invention relates to the technical field of organic synthesis, in particular to a method and device for preparing 4-methyl-1-pentene, and the method comprises the following steps: (1) pretreating a raw material containing propylene and an inert substance, and carrying out heat exchange on the obtained refined raw material to obtain a heat-exchanged raw material; (2) carrying out dimerization reaction on the raw material subjected to heat exchange and a catalyst in the presence of inert gas, wherein the obtained reaction product is divided into a part of reaction product and a residual part of reaction product; (3) cooling the part of the reaction product as a heat exchange medium, and carrying out heat exchange with the refined raw material to obtain a heat-exchanged product; (4) separating a mixed material of the rest reaction product and the product after heat exchange to obtain a light component and a heavy component; and carrying out rectification on the heavy component to obtain the 4-methyl-1-pentene. According to the method, by controlling the reaction temperature rise, the stable reaction temperature and the uniform reaction process are ensured, and the raw material conversion rate and the product selectivity are further improved.

Provided is a continuous process for converting waste plastics to recycle for polypropylene polymerization. The process includes the steps of selecting waste plastics comprising polyethylene and / or polypropylene, and preparing a stable blend of petroleum and the selected plastics. The amount of plastics in the blend constitutes less than 20 wt% of the blend. The blend is passed to a refinery-hydrocracking unit. A liquefied petroleum gas C3 olefin / paraffin mixture is recovered from the hydrocracking unit. The C3 paraffins and C3 olefins are separated into different fractions, the C3 olefin fraction is passed to a propylene polymerization reactor, and the C3 paraffin fraction is optionally passed to a dehydrogenation unit to produce additional propylene. A heavy fraction is also recovered from the hydrocracking unit and can be passed to an isomerization dewaxing unit to prepare base oil.

The invention belongs to the field of ethylene production devices, and discloses a method and a system for coupling RTC dry gas and an ethylene device and transformation of the ethylene device. The system comprises an ethylene rectifying tower unit, an original propylene refrigeration unit, a newly added propylene refrigeration unit, a cold box unit and an RTC ethylene-rich C2 gas feeding pipeline. According to the invention, the newly added cold box unit and the newly added propylene refrigeration unit are used for recovering cold energy in circulating ethane and a liquid-phase ethylene product of a modified system, so that the temperature and the operation difficulty of RTC dry gas entering an ethylene rectifying tower are reduced, the yield of the ethylene product is increased, and the influence degree on an original ethylene device is minimum; the investment cost and the construction period can be saved.

The invention relates to an acetylene purification system and method, in particular to a method for removing impurities in acetylene to an electronic-grade acetylene level through a membrane separation technology coupled rectification process, and belongs to the field of gas separation. Aiming at the characteristics of an industrial grade acetylene material, the invention provides a technology for preparing electronic grade acetylene based on membrane separation coupling rectification, the membrane separation technology and the rectification technology are organically coupled, and a safe solvent is introduced into a rectification tower, so that the thermal stability of liquid acetylene is effectively improved, and the explosion risk is remarkably reduced. According to the technology, efficient preparation of the electronic-grade acetylene (the purity is greater than or equal to 99.9999%) is realized, and the method has a good industrial application prospect and popularization value.

The invention belongs to the technical field of byproduct recovery in phenol-acetone production, and particularly relates to a device and a method for purifying alpha-methyl styrene from byproducts in phenol-acetone production. The device comprises a filter, a light component removal tower, an AMS purification tower, a first cooler, a second cooler, a first reflux tank, a second reflux tank, a first reflux pump, a second reflux pump, a first reboiler, a second reboiler and a discharge pump. The alpha-methylstyrene is purified by using the device disclosed by the invention, so that the investment cost of a catalyst for generating cumene through hydrogenation of AMS is saved, the alpha-methylstyrene with high additional value can be recovered, and the economic benefit is improved.

The disclosure relates to a process for separating a hydrocarbon-containing feedstock stream by extractive distillation, wherein the feedstock stream is contacted with a water-soluble solvent for aromatics in countercurrent. An aliphatics fraction is distillatively removed as aliphatics product stream from the mixture obtained. The aromatics are stripped from the aromatics-enriched solvent that remains and the aromatics-depleted solvent is recycled in a solvent circuit, with compounds having a lower boiling point compared to the solvent accumulating in the solvent circuit as impurities. At least a substream of the solvent circuit is purified for removal of the impurities, wherein the substream for the purifying is subjected to a thermal separation process, in which the impurities are at least partly discharged in a top product and the purified solvent that remains is recycled into the solvent circuit. An apparatus for carrying out the process is also disclosed.

The present invention relates to a separation device comprising a distillation column having double separation walls, a first reboiler, a second reboiler, and a condenser and, more specifically, to a separation device which prevents the problem of clogging due to by-products and improves the recovery rate of unreacted monomers by improving the circulation system and the structure of the bottom section of a distillation column in an oligomerization process.

The invention belongs to the field of chemical engineering, and particularly relates to a separation device and a separation method for separating a toluene and n-butyl alcohol mixture through low-temperature water washing. According to the method, different intersolubility changes of toluene and n-butanol in water at different temperatures are mainly utilized, n-butanol is washed into water in a low-temperature water washing standing layering mode, and then water and n-butanol are separated through rectification; according to the method, a third medium (containing water in a mixed solvent of methylbenzene and n-butyl alcohol) is not introduced, so that the secondary treatment difficulty and potential quality hazards are not increased; the processing mode is simple, the hardware investment cost is low, the low-temperature refrigerant is common in chemical enterprises, and old and existing equipment can be easily utilized in the chemical enterprises; the operation mode is simple, and the operation control difficulty is low.

The utility model relates to a negative-pressure crude benzene distillation system adopting a tubular furnace for heating. The negative-pressure crude benzene distillation system comprises a debenzolization tower, the tubular furnace and a crude benzene condensing, cooling and separating integrated device, the debenzolization tower is sequentially provided with a rectifying section, a stripping section, a storage tank section and a regeneration section from top to bottom; the crude benzene condensing, cooling and separating integrated device comprises a heat exchange tower and a separating tank; a low-temperature water heat exchanger is arranged at the lower part of the heat exchange tower; a crude benzene collecting section, an oil-gas-water separating section and a water collecting section are arranged in the separating tank; a first heating section and a second heating section are arranged in the tubular furnace. Compared with an existing negative-pressure crude benzene distillation process system, the negative-pressure crude benzene distillation process system has the remarkable advantages that the tail gas output is low, the tail gas is not discharged, the tube furnace operation temperature is low, the washing oil consumption is small, no additional separated water is generated, the one-time investment is low, and the like.

The invention relates to the technical field of waste gas treatment, and particularly discloses a method and system for recycling xylene in high-concentration xylene waste gas, the system comprises a precooler, an absorption system, a regeneration system and a receiving tank, the absorption system is composed of an absorption tower, a heat exchanger and a recooler, the precooler is connected with a lower inlet pipeline of the absorption tower, and the absorption tower is connected with a lower outlet pipeline of the heat exchanger; a booster fan is arranged in a pipeline connecting the precooler and the absorption tower, a bottom outlet of the absorption tower is connected with a first inlet pipeline of the heat exchanger, and a rich liquid pump is arranged on a pipeline connecting the absorption tower and the heat exchanger; the regeneration system comprises a regeneration tower, a condenser, a vacuum buffer tank, a vacuum pump tail cooler and a vacuum pump tail gas recooler. According to the invention, the high-concentration xylene waste gas can be stably and continuously treated, xylene in the xylene waste gas can be efficiently recovered, the quality of the recovered product is ensured, the absorbent can be recycled, the absorbent does not need to be replaced during treatment work, the production cost is saved, and the production efficiency is improved.

[Problem] To provide a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. [Solution] A method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha, the method including step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

The present invention provides a vacuum tail gas pipeline anti-blocking and smoke elimination device for a coking crude benzene hydrogenation equipment, wherein the coking crude benzene hydrogenation equipment comprises a distillation tower, a tower top condenser, a reflux tank, a vacuum unit, a vacuum tail gas pipeline, a continuous liquid discharge liquid sealing device, and a flare, wherein the vacuum tail gas pipeline anti-blocking and smoke elimination device comprises a water washing tank and a gas-liquid separation tank, wherein the water washing tank is arranged on the inlet pipeline of the vacuum unit, between the reflux tank and the vacuum unit, and the gas-liquid separation tank is arranged between the vacuum tail gas pipeline and the continuous liquid discharge liquid sealing device. The vacuum tail gas pipeline anti-blocking and smoke elimination device of the present invention can effectively eliminate the smoke phenomenon caused by the blockage of the vacuum tail gas pipeline and the entrainment of benzene liquid, and realize the dual treatment of vacuum tail gas emission smoke and pipeline blockage.

The utility model provides an aromatic hydrocarbon extraction device. The aromatic hydrocarbon extraction device comprises a de-heavy tower, an extraction tower, a recovery tower, a first rectifying tower and a second rectifying tower which are connected in sequence, a tower top steam outlet of the de-heavy tower is connected with a heat source inlet of an extraction tower reboiler, and a heat source outlet of the extraction tower reboiler is connected with a feed port of the extraction tower through a de-heavy tower return tank. A discharge port of the extraction tower is connected with a feed port of the recovery tower, a tower top steam outlet of the recovery tower is connected with a feed port of the first rectifying tower through a recovery tower return tank, and a discharge port of the first rectifying tower is connected with a feed port of the second rectifying tower. The aromatic hydrocarbon extraction device disclosed by the utility model has the characteristics of high aromatic hydrocarbon extraction rate, high purity, energy conservation and high efficiency.

The invention relates to the technical field of propylene dimerization, in particular to a method and device for preparing 4-methyl-1-pentene through propylene dimerization, and the method comprises the following steps: (1) dehydrating and deoxidizing a raw material containing propylene, a coking inhibitor and a diluent to obtain a treated raw material; (2) contacting the treated raw material with a catalyst, carrying out dimerization reaction to obtain a reaction material, carrying out heat treatment on part of the reaction material, returning, and carrying out the dimerization reaction; (3) carrying out rectification separation on the rest reaction material to obtain a light component, 4-methyl-1-pentene and a heavy component; wherein the total temperature rise delta T of the dimerization reaction is regulated and controlled through the mass ratio of the diluent to the propylene in the raw materials and the recycle ratio of the reaction materials, and the recycle ratio of the reaction materials is the mass ratio of the part of the reaction materials to the propylene in the raw materials. According to the method, the selectivity of the 4-methyl-1-pentene is effectively improved.

A fuel production apparatus (1) includes: a synthesis gas production unit (2) that produces a synthesis gas containing carbon monoxide and hydrogen by using carbon dioxide and hydrogen; a hydrocarbon production unit (4) that produces a hydrocarbon (C5+) by using the synthesis gas; a first distillation separator (28) that separates at least a first fraction and a second fraction lighter than the first fraction from an effluent from the hydrocarbon production unit (4); a hydrocracking unit (32) that performs a hydrocracking treatment on a portion of the first fraction; and a catalytic cracking unit (34) that performs a catalytic cracking treatment on another portion of the first fraction.

The invention provides a propylene mass fraction prediction method, a propylene mass fraction prediction system and a computer readable storage medium. The method for predicting the mass fraction of propylene comprises the following steps: acquiring data of a propylene rectifying tower; constructing a time delay matrix based on the time sequence characteristics of the propylene rectifying tower data, and performing dimension reduction on the propylene rectifying tower data by adopting principal component analysis based on the time delay matrix so as to extract characteristic data; and inputting the characteristic data into a bidirectional long-short-term memory network model to predict the propylene mass fraction, and determining parameters of the bidirectional long-short-term memory network model according to a pelican optimization algorithm. According to the prediction method for the propylene mass fraction provided by the invention, the prediction precision and the model robustness can be improved, and a more reliable and efficient solution is provided for process control of a propylene rectifying tower.

The utility model belongs to the technical field of refining devices for chemical raw materials, and particularly relates to a 1-butene refining device with coupled dividing wall column and heat pump rectification. The 1-butene refining process device with coupled dividing wall column and heat pump rectification comprises a dividing wall column, a 1 # condenser and a compressor, a partition plate is arranged in the dividing wall column and divides the internal space of the dividing wall column into four parts, namely a public rectifying section, a feeding section, a discharging section and a public stripping section, a liquid collecting tray is arranged at the public rectifying section, and a liquid outlet is formed in the liquid collecting tray. A liquid outlet of the liquid collecting tray is connected with one end of a distribution pipeline outside the dividing wall column, the other end of the distribution pipeline is connected with the feeding section and the discharging section, and a regulating valve is arranged on the distribution pipeline; a tower bottom discharge port of the dividing wall tower is connected with the 1 # heat exchanger, the 1 # heat exchanger is connected with the throttle valve, and the throttle valve is connected with the 1 # condenser. The 1-butene refining device with coupled dividing wall column and heat pump rectification, provided by the utility model, is compact in structure and low in investment.

The present application discloses a method for purifying high-purity propylene, comprising: passing an industrial-grade propylene raw material into a condensation device for at least one condensation treatment to remove heavy components therefrom; analyzing and testing the product that has undergone at least one condensation treatment, and if the analysis fails, returning it for further condensation treatment until the analysis passes; passing the qualified product into an adsorption device for adsorption treatment to remove carbon dioxide and water therefrom; passing the adsorption-treated product into a distillation device for distillation treatment to remove light components therefrom; passing the distillation-treated product into a buffer tank for filling, thereby obtaining the high-purity propylene. The high-purity propylene purification method of the present application utilizes a combination of low-temperature liquefaction, adsorption, and distillation to directly purify industrial propylene with a purity of ≥2.5N into electronic-grade high-purity propylene with a purity greater than 4N.

The invention relates to the technical field of C9 heavy aromatics, in particular to a method and device for producing mesitylene from C9 heavy aromatics, and the method comprises the following steps: firstly, in the presence of a catalyst, mixing the C9 heavy aromatics with hydrogen, performing dealkylation isomerization reaction and dehydrogenation separation to obtain a liquid-phase product, and then performing two-stage separation on the liquid-phase product to obtain mesitylene. And mesitylene is produced to the maximum extent. The C9 heavy aromatics are subjected to selective dealkylation and trimethylbenzene isomerization reaction, and the obtained product does not contain propylbenzene, and the content of methyl-ethylbenzene is 1t; the method has the advantages that the yield of mesitylene is more than or equal to 0.2%, the interference of methyl ethyl benzene on the separation of the mesitylene is eliminated, the loss of the mesitylene is small, the one-way yield of the mesitylene is more than or equal to 12%, the reaction process is simple, the mesitylene and unsym-trimethylbenzene products are high in purity, the unsym-trimethylbenzene can be recycled to further increase the yield of the mesitylene, the process is flexible, byproducts are few, the product value is high, and the utilization value of C9 heavy aromatic hydrocarbon resources is obviously improved.