3581results about "Distillation purification/separation" patented technology

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A process is disclosed for generating pure aromatic compounds from a reformed gasoline which contains aromatic compounds, olefins, diolefin, and triolefins, which comprises the steps of: (a) selectively hydrogenating the olefins, diolefins and triolefins in the reformed gasoline to obtain a mixture of hydrogenated, non-aromatic compounds and aromatic compounds; and (b) separating the aromatic compounds from the hydrogenated, non-aromatic compounds in the mixture formed during step (a) by either extractive distillation, liquid-liquid extraction or both to obtain the pure aromatic compounds.

The invention relates to a process for preparing butadiene from n-butenes, which comprises the following steps:

• • A) provision of a feed gas stream a comprising n-butenes;
  • B) introduction of the feed gas stream a comprising n-butenes and an oxygen-comprising gas into at least one dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene, unreacted n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases;
  • C) cooling and compression of the product gas stream b in at least one cooling stage and at least one compression stage, with the product gas stream b being brought into contact with a circulated coolant to give at least one condensate stream c1 comprising water and a gas stream c2 comprising butadiene, n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases;
  • D) separation of incondensable and low-boiling gas constituents comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by absorption of the C₄-hydrocarbons comprising butadiene and n-butenes in a circulated absorption medium, giving an absorption medium stream loaded with C₄-hydrocarbons and the gas stream d2, and subsequent desorption of the C₄-hydrocarbons from the loaded absorption medium stream to give a C₄ product gas stream d1;
  • E) separation of the C₄ product stream d1 by extractive distillation using a solvent which is selective for butadiene into a stream e1 comprising butadiene and the selective solvent and a stream e2 comprising n-butenes;
  • F) distillation of the stream e1 comprising butadiene and the selective solvent to give a stream f1 consisting essentially of the selective solvent and a stream f2 comprising butadiene;
  • where samples are taken from the circulated coolant in step C) and/or the circulated absorption medium in step D) and the peroxide content of the samples taken is determined by means of iodometry, differential scanning calorimetry (DSC) or microcalorimetry.

A system for removing acid gases from a sour gas stream is provided. The system includes an acid gas removal system and a heavy hydrocarbon removal system. The acid gas removal system receives the sour gas stream and separates the sour gas stream into an overhead gas stream comprised primarily of methane, and a bottom acid gas stream comprised primarily of acid gases such as carbon dioxide. The heavy hydrocarbon removal system may be placed upstream or downstream of the acid gas removal system or both. The heavy hydrocarbon removal system receives a gas stream and separates the gas stream into a first fluid stream comprising heavy hydrocarbons and a second fluid stream comprising other components. The components of the second fluid stream will depend on the composition of the gas stream. Various types of heavy hydrocarbon removal systems may be utilized.

Among other things, this disclosure provides an olefin oligomerization system and process, the system comprising: a) a transition metal compound; b) a pyrrole compound having independently-selected C₁ to C₁₈ organyl groups at the 2- and 5-positions, wherein at least one of the organyl group alpha-carbon atoms attached to the 2- and 5-positions of the pyrrole compound is a secondary carbon atoms; and c) a metal alkyl. For example, the 2,5-diethylpyrrole (2,5-DEP)-based catalyst systems can afford a productivity increases over unsubstituted pyrrole catalyst systems, non-2,5-disubstituted catalyst systems, and 2,5-dimethylpyrrole (2,5-DMP) catalyst systems.

Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of: A) at least one nitroxyl compound, and B) at least one quinone alkide compound having an electron-withdrawing group at the 7-position. Additionally, a composition is disclosed that comprises: A) at least one nitroxyl compound, and B) at least one quinone alkide compound having an electron-withdrawing group at the 7-position.

The present invention discloses separating method for converting methanol to prepare DMTO gas, and has improved process after four section compression in the front ethane eliminating process. The present invention has one increased hydrogenating oxygen conversion step between the five section compression and the reflux accumulator of ethane eliminating tower to eliminate acetylene and oxygen produced in the regeneration. Of the condensed and cooled material through the reflux accumulator of ethane eliminating tower, the liquid phase serves as the reflux liquid of the ethane eliminating tower, the gas phase is fed to the deep cooling methane eliminating system and the material after condensing and cooling enters the high pressure methane eliminating tower directly. The DMTO gas separating process can obtain ethylene recovering rate as high as 99.5 %.

A processing method and system for separating methane-rich and ethane-rich components from an LNG stream. The LNG stream is preheated against a distillation column overhead vapor stream and against an overhead vapor product prior to entering the column. The overhead vapor product is methane-rich. The LNG stream may further be preheated against the column bottoms and another heating medium. The method may also include compressing the methane-rich product, condensing it against the LNG stream, and pumping it. The system may also comprise third and fourth heat exchangers configured to preheat the LNG stream with the bottoms product and the heating medium. Further, the system may provide for compressing the overhead vapor product prior to the its exchanging heat with the LNG stream and a pump for pumping condensed overhead vapor product. Additionally, the system generates all of the required reflux by cross exchanging the column overhead with the incoming LNG stream.

The invention relates to a method for extracting squalene from vegetable oil deodorized distillate. A process method of combining molecular distillation with extraction and crystallization is used to extract high-concentration squalene and recover natural vitamin E and phytosterol with a certain purity from vegetable oil deodorized distillate. The method comprises the following steps of: carryingout a saponification reaction of the raw material; twice molecularly distilling unsaponifiable matter obtained by extraction; using the distillate obtained during the second distilling as a raw material for cold crystallization to obtain phytosterol; recovering squalene and mixed tocopherol from the filtrate; and extracting with multi-stage solvents to respectively enrich squalene and vitamin E in two phases. The process has simple flows, low-prices raw material and higher separation efficiency and recovery rate and comprehensively utilizes useful contents in the deodorized distillate.

A process for obtaining pure 1,3-butadiene from crude 1,3-butadiene by distillation is carried out in a dividing wall column in which a dividing wall is located in the longitudinal direction of the column to form an upper common column region, a lower common column region, a feed section and an offtake section.

The invention is for a process for producing propylene and hexene (along with ethylene, pentenes, product butenes, heptenes and octenes) by metathesis from butenes (iso-, 1- and cis and trans 2-) and pentenes and then aromatizing the hexenes (along with higher olefins, such as heptenes and octenes) to benzene (along with toluene, xylenes, ethylbenzene and styrene). Since the desired products of the metathesis reaction are propylene and hexene, the feed to the metathesis reaction has a molar ratio for 1-butene:2-butene which favors production of propylene and 3-hexene with the concentration of hexenes and higher olefins in the metathesis product being up to 30 mole %. An isomerization reactor may be used to obtain the desired molar ratio of 1-butene:2-butene for the feed composition into the metathesis reactor. After the metathesis reaction, of hexene and higher olefins are separated for aromatization to benzene and other aromatics.

Disclosed are compounds produced by a process comprising the step of reacting an amine reactant with an epoxide reactant to form a hydrolytically stable carbon-nitrogen bond therebetween, wherein at least one of the amine or epoxide reactants comprises a terminal alkoxysiyl group. Also disclosed are curable compositions comprising the compounds of the present invention and the cured products derived therefrom.

A two-tower scheme process for the recovery of propane and heavier components from a hydrocarbon gas stream is provided. Feed gas is cooled, partially condensed, and then separated to give a first liquid stream and a first vapor stream. First liquid stream is sent to a distillation tower that recovers at the bottoms a major portion of propane and heavier components and produces an overhead gas stream. First vapor stream is expanded and sent as bottom feed to the absorber. Absorber produces an absorber overhead stream containing essentially all the ethane and lighter components and an absorber bottoms stream. Absorber bottoms stream is heated and sent to the distillation tower as middle feed. Absorber overhead stream is warmed and optionally compressed. A part of the compressed stream is substantially condensed and sent to absorber as top feed. The process and apparatus can be used to recover ethane and heavier hydrocarbons.

The invention provides a technology device and method for preparing propylene by dehydrogenating propane or propane-enriching low carbon hydrocarbon. The device comprises a reacting/regenerating part and a product fractionating part. A reacting/regenerating system is divided into a parallel type arrangement scheme and a coaxial type arrangement scheme by a fluidized bed reacting/regenerating technology, wherein a raising pipe of the parallel type reacting/regenerating system is an internal or external raising pipe, and a raising pipe of the coaxial type reacting/regenerating system is an external raising pipe. The method comprises the steps: leading raw materials and reaction products to enter into a raising pipe reactor after heat exchange; performing a dehydrogenating conversion reaction under the conditions that the reaction temperature is 500-700 DEG C, the pressure is 0.1-0.4MPa, and the ratio of a microspherical catalyst to oil is 5-60, wherein the microspherical catalyst consists of chromium, rare earth oxides, alkali metal oxides and a gamma-Al2O3 carrier, preferably, the temperature is 550-670 DEG C, the pressure is 0.1-0.15MPa, and the ratio of the microspherical catalyst to oil is 6-14; leading the reaction products and the raw materials to enter into a gas-oil separator to separate a gas phase, a liquid phase from a water phase after heat exchange and cooling; leading the separated gas to enter into a gas compressor to be compressed and be transported to an absorbing/stabilizing part; pumping the liquid to an absorbing tower; transporting the liquefied gas from a return tank at the top of a stabilizing tower to a propylene/propane separating tower by a charging pump of a propylene tower; discharging the fine propylene separated from the top of the tower out of the device as a product; discharging the separated byproduct hydrogen out of the device; and returning products at bottom of the tower to the reacting/regenerating part to be recycled.

The invention discloses a low eutectic solvent for aromatic hydrocarbon separation. The low eutectic solvent is obtained by mixing hydrogen bond receptors and hydrogen bond donors according to a certain ratio (the molar ratio of 1: 1 to 1:10), and stirring till being in a uniform transparent state at 70-100 DEG C. The low eutectic solvent is low in toxicity, environment-friendly and high in efficiency, and can be applied to the process of separating aromatic hydrocarbons from non-aromatic hydrocarbons in coal tar and petroleum oil.

The invention provides an iso-butane, n-butane and butylene separation and purification method. C4 raw materials are successively put into a C3 decarburization tower, a C5 decarburization tower, an iso-butane tower, an n-butane tower and a stripping tower to obtain high-purity iso-butane, n-butane and butylene. Solvents are cyclically utilized. The iso-butane, n-butane and butylene separation and purification method has the technical advantages that not only can equipment investment be reduced, but also the advantages of extractive distillation are used and the energy consumption is reduced.

The invention relates to a method for separating oxygenated chemicals and 1-hexene from a Fischer-Tropsch synthesis oil product.The method comprises the steps that C6 fraction material flow is obtained through distillation in a predistillation tower by taking the Fischer-Tropsch synthesis oil product as a raw material, and two streams of extraction agents are fed to remove oxygenated chemicals in an extraction tower to obtain material flow rich in the oxygenated chemicals and crude C6 hydrocarbon material flow; the oxygenated chemicals contained in the crude C6 hydrocarbon material flow are further removed through a third extraction agent, tertiary olefins are converted into corresponding ethers through methyl alcohol under the action of an etherification catalyst to be removed, further purification is performed through rectification, and then C6 isoparaffin components and cycloolefin components are removed sequentially through a fourth extraction agent and a fifth extraction agent respectively to obtain 1-hexene product material flow.Compared with the prior art, the method has the advantages of being simple in technological process, low in cost and the like, and not only is 1-hexene separated and purified from the Fischer-Tropsch synthesis oil, but also the oxygenated chemicals can be separated.

The present invention relates to an integrated process for producing diesel fuel or fuel additive from biological material by producing paraffins by a Fischer-Tropsch reaction on one hand and by a catalytic hydrodeoxygenation of bio oils and fats on the other hand. The two hydrocarbon streams are combined and distilled together. The invention also relates to the use of lignocellulosic material, such as by-products of the wood-processing industry for producing diesel fuel and to a method for narrowing the chain length distribution of Fischer-Tropsch derived diesel fuel. The invention provides a high-quality middle distillate fraction from various biological sources and most preferably from by-products of the wood-processing industry. The invention also relates to equipment for producing fuel form biological material, which comprises a hydrodeoxygenation reactor (3) for hydrocarbons, a cracking/isomerization reactor (11) for FT paraffins and a separation unit (12) for the combined hydrocarbons. Hydrogen is separated from light fractions in a separation unit (9) and reformed in the process. The equipment is advantageously integrated with a pulp and paper mill, which provides biological material and receives waste and energy.

Disclosed is a method for producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using a parallel reactor in which catalysts are charged into fixed bed reactors and are not physically mixed. More specifically, disclosed is a method for efficiently producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using the parallel reactor containing multi-component bismuth molybdate-based catalysts exhibiting different activities to oxidative dehydrogenation for normal-butene isomers (1-butene, trans-2-butene and cis-2-butene), and butene separated from a C4 mixture containing normal-butene and normal-butane, as a reactant.