1265results about "Distillation purification/separation" patented technology

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.

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 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 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 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 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 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 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.

The invention belongs to the technical field of dielectric material monomer synthesis, and discloses a preparation method of 1-methylbenzocyclobutene, which comprises the following steps: reacting 1-hydroxybenzocyclobutene serving as a raw material with paratoluensulfonyl chloride (TsCl) to generate 1-paratoluensulfonyloxy benzocyclobutene, then reacting with methylmagnesium chloride under the action of a catalyst to obtain 1-paratoluensulfonyloxy benzocyclobutene; the target product 1-methylbenzocyclobutene is synthesized mainly by controlling the reaction temperature, the feeding sequence and the feeding proportion under the relatively mild condition, and the method is simple in technological operation, mild in experimental condition, high in product yield and suitable for industrial production.

The invention provides a method for preparing tetracyclododecene in a reactive distillation device by taking C9 fraction and norbornene as raw materials. The method comprises the following steps: mixing the C9 fraction and the norbornene in a mixer and reacting in the reactive distillation device; the reacted material is directly rectified in a reaction rectification device, residual C9 fraction and norbornene in the reaction are obtained at the tower top, and a crude tetracyclododecene product is obtained in the reaction kettle; and separating high-boiling-point components from the crude tetracyclododecene product in the reaction kettle section of the rectifying tower in the reactive distillation device in a third rectifying tower to obtain the high-purity tetracyclododecene product. According to the invention, the reaction rectification device is used, and the reactor is combined with the rectification tower, so that the reaction product can be directly and preliminarily separated to obtain a light component mainly containing norbornene and a heavy component containing tetracyclododecene, the equipment cost can be saved, the energy consumption can be reduced, and the rectification effect can be improved; meanwhile, the C9 fraction is used as a raw material, and downstream application of the C9 fraction is expanded.

Inhibitor compositions for abating undesirable emulsion polymerization during processing of hydrocarbon stream laden with reactive vinylic monomers are provided. The polymerization inhibitor compositions include at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor including phenylenediamine. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to a process stream. The process stream includes an ethylenically unsaturated monomer that is suspended in the bulk-phase and highly polar solvents as distractive distillation solvents.

The utility model discloses a separation device for ethyl acetate and cyclohexane, which belongs to the technical field of separation and purification, solves the problems of incapability of large-scale separation, high process difficulty and poor separation effect in the prior art, and comprises an extractive distillation tower, the upper part is provided with a polyol solvent inlet, the top is connected with a first condenser, the outlet of the first condenser is connected with a cyclohexane outlet on the other side of the upper part of the extractive distillation tower, and the cyclohexane outlet is connected with a re-separation device. According to the device disclosed by the utility model, the problem of azeotropy of ethyl acetate and cyclohexane is solved by adding polar polyol, the relative volatility of the ethyl acetate and the cyclohexane is changed, and large-scale efficient separation of a mixture of the ethyl acetate and the cyclohexane is realized; the dissolubility of cyclohexane, sodium acetate and ethanol in water is different, so that the separation effect of cyclohexane is further improved, and the whole device is simple in structure.

Processes and apparatuses for separating carbon monoxide from ethylene. The ethylene may be produced from biobased alcohol. The separation utilizes a fractionation column which produces a carbon monoxide depleted ethylene stream and an overhead stream comprising carbon monoxide and ethylene. The ethylene from the overhead stream may be recovered in an absorption zone with an absorbing liquid. A oxygenate fractionation zone may be utilized to remove oxygenates from the carbon monoxide depleted ethylene stream.

The utility model provides a caprolactam rectification heat energy coupling utilization system, which comprises a cyclohexane refining tower, a cyclohexene separation tower and a debenzolization tower which are communicated in sequence, in the system, high-temperature gas-phase materials generated by the cyclohexane refining tower and the cyclohexene separation tower and kettle bottom liquid in the next tower are subjected to heat exchange treatment through a falling film evaporator, and the cyclohexene separation tower and the kettle bottom liquid in the next tower are separated; the feeding temperature of the next tower is increased, so that the heat utilization of high-temperature steam is improved, the use of steam is reduced, and the production cost is reduced; meanwhile, the use of fire coal is reduced, the emission of waste gas is reduced, and the environment is protected.

The invention discloses a tetracyclododecene preparation method, which comprises: mixing an N-methyl pyrrolidone (NMP) solvent, norbornene and toluene, heating to a reaction temperature in a reaction kettle, dropwise adding cyclopentadiene, and carrying out a Diels-Alder reaction in the reaction kettle to prepare tetracyclododecene, the high-purity tetracyclododecene with the mass content of 99% or above can be obtained through subsequent rectification. According to the process, cyclopentadiene is dropwise added, so that the reaction time is shortened, side reactions are reduced, the reaction is carried out in a liquid phase by taking NMP (N-Methyl Pyrrolidone) with a higher boiling point as a solvent, the reaction temperature can be reduced, the reaction process can be carried out at normal pressure, the production safety is improved, and the production operation cost is reduced.

The continuous production heat pump assisted integrated extractive distillation device is adopted to realize high-purity separation and recovery of the diethyl ether-methyl formate-n-pentane azeotrope, and separation is realized by utilizing the characteristic that the extraction agent has great influence on the relative volatility of the diethyl ether-methyl formate-n-pentane azeotrope. The purity of the separated diethyl ether, n-pentane and methyl formate reaches 99.9% or above, high-purity recycling 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 separation and purification, in particular to a method and a device for separating and purifying aromatic hydrocarbon, alkane and olefin, and the method combines liquid-liquid extraction and extractive distillation (namely, first extractive distillation and second extractive distillation), so that the liquid-liquid extraction and the extractive distillation are operated in respective dominant zones. In liquid-liquid extraction, heavy alkanes with small solubility are separated, light alkanes with high relative volatility are separated in first extractive distillation, olefins with high relative volatility are separated in second extractive distillation, aromatic hydrocarbons and solvents are separated in solvent recovery, and finally, the same solvent is used to realize efficient separation of aromatic hydrocarbons, alkanes and olefins.

The utility model relates to the technical field of chemical production, and particularly discloses an industrial C10 crude aromatic hydrocarbon production device. The device comprises a refining tower and a heavy component removal tower, a tower bottom outlet of the refining tower is provided with a first pipeline, the first pipeline is provided with a first branch of the first pipeline and a second branch of the first pipeline, and the first branch of the first pipeline is connected to a side inlet of a tower body of the heavy component removal tower; an SA-1500 product outlet pipeline is arranged at the top of the heavy component removal tower, and a C10 crude aromatic hydrocarbon outlet pipeline is arranged at the bottom of the heavy component removal tower; a second branch of the first pipeline is connected to a C10 crude aromatic hydrocarbon outlet pipeline; and a first flow regulating valve and a second flow regulating valve are respectively arranged on the first branch of the first pipeline and the second branch of the first pipeline. According to the utility model, by changing the process flow of the de-heavy tower and adjusting the flow direction of materials at the top and the bottom of the de-heavy tower, the production load of the de-heavy tower is reduced so as to produce qualified industrial C10 crude aromatic hydrocarbon products, and the steam heat source amount is reduced so as to achieve economic balance.

The invention relates to a device and a method for preparing isobutene and methanol by cracking methyl tert-butyl ether. The device comprises a methyl tert-butyl ether vaporization refining tower, a reactor, a cooling tower, an absorption tower, a methanol extraction tower, an isobutene light component removal tower and an isobutene heavy component removal tower which are sequentially connected along a material conveying direction, a top discharge hole of the cooling tower is connected with a lower gas-phase material inlet of the absorption tower; an absorbent outlet at the bottom of the absorption tower is circularly connected with a cooling absorption liquid inlet at the top of the cooling tower; the bottom extract liquor outlet of the methanol extraction tower is circularly connected with the top absorbent inlet of the absorption tower; an isobutylene discharge hole is formed in the top of the isobutylene heavy component removal tower; the device further comprises a methanol recovery tower and a methanol refining tower which are connected in sequence along the material conveying direction; a bottom cooling absorption liquid outlet of the cooling tower is connected with the methanol recovery tower; a methanol discharge hole is formed in the bottom of the methanol refining tower. The device provided by the invention not only can relax the limitation of the purity of methyl tert-butyl ether in raw materials, but also can prepare high-purity isobutene and high-purity methanol at the same time.

Disclosed is the use of a dividing-wall column in a process for co-producing propylene oxide and styrene monomer. Feed streams to a dividing-wall column comprise a bottoms product produced in recovering crude propylene oxide from an epoxidation reaction product, a hydrogenated byproduct styrene monomer production, and a light fraction of a bottoms product withdrawn from the dividing-wall column. Products from the dividing-wall column comprise an overhead product comprising ethylbenzene for recycle to an oxidation zone, an intermediate product comprising methylbenzyl alcohol and acetophenone as feed to a dehydration zone to produce styrene monomer, and a bottoms product comprising methylbenzyl alcohol and heavy materials.

A process reacts olefins having 4 to 20 carbon atoms and the feed stream used, containing at least linear olefins and branched olefins, is distilled between two reaction steps and only the high-boiler phase obtained in this distillation is subjected to the second reaction, a heterogeneously catalysed hydroformylation, a homogeneously catalysed hydroformylation or a homogeneously catalysed alkoxycarbonylation.

A method for separating VdF and acetylene, the method comprising: a step for mixing a first mixture containing VdF and acetylene with an extraction solvent, which is at least one compound selected from the group consisting of methanol, acetone, chloroform, and 1-chloro-2, 3, 3-trifluoro-1-propene, to obtain a mixture for extraction; and a step in which the mixture for extraction is distilled to obtain a distillate having VdF as the main component and a bottom product having an extraction solvent as the main component and further containing acetylene, respectively.

This utility model discloses a displacement medium separation and recovery device for a propane dehydrogenation production line, comprising an absorption tower and a stabilizing tower. The absorption tower is connected at its middle section to the feed pipeline of the product compression unit and the feed pipeline of the gas fractionation unit. At its top, the absorption tower is connected to a dry gas separator via a non-condensable gas pipeline. The top of the dry gas separator is connected to the flare header via a flare discharge pipeline. At its bottom, the absorption tower is connected to the stabilizing tower via a rich absorbent oil pipeline. The stabilizing tower is connected to a reflux tank via a gas-phase liquefied gas pipeline. The output end of the reflux tank is connected to the gas fractionation unit via a liquefied gas pipeline, and a liquefied gas transfer pump is installed on the liquefied gas pipeline. At its lower end, the stabilizing tower is connected to the absorption tower via a lean absorbent oil pipeline, and a lean absorbent oil transfer pump is installed on the lean absorbent oil pipeline. This utility model can partially recover residual propane gas in the displacement medium, improving production efficiency and reducing environmental pollution.

The invention discloses a high-silicon crude benzene hydrogenation process which comprises the following steps: firstly, separating a raw material crude benzene into a crude benzene component I and a crude benzene component II, sequentially carrying out first-stage hydrogenation on the crude benzene component I to remove unsaturated substances such as styrene and diolefin, and carrying out second-stage hydrogenation on the crude benzene component I to remove silicon-containing compounds and residual unsaturated substances such as styrene and diolefin; and mixing with a crude benzene component II, and carrying out third-stage hydrogenation to remove impurities such as sulfur, nitrogen and the like. According to the distribution of the content of styrene and silicon in the crude benzene, styrene and silicon in the crude benzene are enriched in the crude benzene component I through distillation separation, and the crude benzene component II is removed, so that the hydrogenation styrene removal and hydrogenation desilicication reactions of the crude benzene component I are easier to carry out, meanwhile, the removal of silicon-containing compounds is further promoted through the addition of ethylenediamine, and the yield of the crude benzene is improved. The desiliconization activity and precision of second-stage hydrogenation are improved, and the problem of rapid deactivation of the catalyst caused by silicon poisoning in high-silicon crude benzene hydrogenation is effectively solved.

The venturi-type scrubber may be used in conjunction with the removal of solids and quench gas-phase reaction products from the gas-phase reaction products. A method can include: providing a reaction product comprising a hydrocarbon gas and a solid; introducing the reaction product into a venturi type scrubber; introducing a scrubbing fluid into the venturi-type scrubber, wherein the scrubbing fluid is at a lower temperature than the reaction product; generating, by the venturi scrubber, a heterogeneous product comprising a scrubbed reaction product and a waste scrubbing fluid, the scrubbed reaction product comprising the hydrocarbon gas, and the waste scrubbing fluid comprising the scrubbing fluid and the solids; and separating the hydrocarbon gas from the multiphase fluid. A system may include a reactor; a venturi-type scrubber having a first inlet fluidly connected to the reactor and a second inlet configured to receive a scrubbing fluid; and a separation column configured to receive a multiphase stream from the venturi scrubber after solids are removed.

The invention discloses a method for reducing energy consumption in a heavy aromatics separation process. The method comprises the following steps: performing heat exchange on fresh C9 < + > aromatic hydrocarbon and a tower top gas phase of a heavy aromatic hydrocarbon separation tower, and separating in a gas-liquid separator to obtain a separator liquid phase and a separator gas phase; a gas phase and a liquid phase of the separator respectively enter from the upper part and the lower part of the same side of the heavy aromatics separation tower, and C9 + aromatics of an upstream section enters from the middle part of the other side of the heavy aromatics separation tower. According to the method, fresh C9 + aromatic hydrocarbon exchanges heat with a gas phase at the top of a heavy aromatic hydrocarbon separation tower, heat in the gas phase at the top of the heavy aromatic hydrocarbon separation tower is effectively recovered, a separator gas phase and a separator liquid phase are generated in a separator and enter the heavy aromatic hydrocarbon separation tower from different positions of the heavy aromatic hydrocarbon separation tower, the load capacity of the separation tower is effectively reduced, and the separation efficiency is improved. Therefore, the energy consumption required in the separation process is reduced to the greatest extent.

A method of safely mixing a hydrocarbon with an oxidant is provided. The hydrocarbon and oxidant are saturated with a non-flammable liquid in pre-mix zones that are flooded with the non-flammable liquid and fluidly connected to a common mixing zone that is partially flooded with the non-flammable liquid. The saturated hydrocarbon and oxidant combine within the common mixing zone forming bubbles of a homogeneous gas mixture of hydrocarbon and oxidant, preferably in a ratio of hydrocarbon to oxidant that is outside of the flammability limit, that can exit the non-flammable liquid into a headspace where it can be retrieved for use in an oxidative reaction process such as oxidative dehydrogenation.

Systems and methods of producing 1-hexene are disclosed. The methods include oligomerizing ethylene to produce 1-hexene in a reactor unit, which involves flowing a first solvent system into the reactor unit, the first solvent system adapted to improve selectivity of 1-hexene in the oligomerizing of the ethylene. The methods can include flowing part of a second solvent system into the reactor unit under washing mode, the second solvent system adapted to dissolve by-products in the reactor unit being washed. The methods can include flowing part of a second solvent system into the catalyst preparation unit, the second solvent system adapted to dissolve catalysts in the catalyst preparation step. The systems can include a reactor, a wax / polymer removal unit, and at least two C6 distillation columns in series for producing 1-hexene.