231results about "Ether preparation by compound addition" patented technology

The present invention relates to a group of cannabinoid derivatives as pharmaceutically active compounds and methods of preparation thereof. The cannabinoid derivatives of the invention are analogues of cannabidiol (CBD). CBD is a non-psychoactive cannabinoid which has been used to treat various diseases and disorders. While such treatments hold promise, there remains a need in the art for more effective treatments and this has been brought about by way of the cannabinoid derivatives of the invention

The utility model relates to an energy-saving production device for preparing methyl tert-butyl ether by an isobutane dehydrogenation method. A raw material gasifier is arranged between the catalytic distillation tower feeding and discharging heat exchanger and the catalytic distillation tower, a temperature sensor is arranged on a feeding pipeline from the raw material gasifier to the catalytic distillation tower, a gas phase at the top of the catalytic distillation tower is divided into two pipelines, a compressor is additionally arranged on one pipeline, and an automatic flow regulating valve is additionally arranged on the other pipeline; a cold-side material outlet of the distillation tower feeding and discharging heat exchanger is connected with a cold-side material inlet of the raw material gasifier, a cold-side material outlet of the raw material gasifier is connected with a feeding hole in the middle lower part of the catalytic distillation tower, and a tower top discharging pipeline of the catalytic distillation tower is respectively connected with an inlet of the compressor and a hot-side material inlet of the condenser; an outlet pipeline of the compressor is connected with a hot measuring material inlet of the raw material gasifier, and a hot measuring material outlet of the raw material gasifier is connected with a liquid inlet of the return tank. According to the utility model, a heat pump technology is adopted, so that the heating power of the tower kettle reboiler is reduced, and the steam consumption is reduced; and the method is more economical.

Computer-implemented methods and apparatuses for assigning or attributing at least one environmental attribute associated with input material(s) to target material(s), wherein the target material(s) are produced by a chemical production network using at least one of the input materials).

Systems and methods for producing MTBE are disclosed. A C4 feed stream containing isobutylene and other C4 hydrocarbons is fed into a reactor unit for producing MTBE. The effluent of the reactor unit comprising MTBE is further processed to produce a MTBE product stream that comprises at least 90 wt. % MTBE. At least a portion of the MTBE product stream is then recycled back to the reactor unit.

The invention relates to the technical field of MTBE production, in particular to a high-yield MTBE catalytic distillation device. The problem that the temperature of a reaction section in an existing device can only be roughly monitored is solved. Comprising a fixing shell, the fixing shell is rotationally connected with a partition part, the partition part is provided with storage modules which are vertically distributed at intervals, the storage modules are used for storing catalysts, flow guide folded plates which are evenly distributed in the circumferential direction are fixedly connected into the fixing shell, and the flow guide folded plates are located between every two adjacent storage modules. A temperature sensor is arranged at the bent position of the flow guide folded plate, a temperature control module is arranged on the lower portion of the flow guide folded plate, a motor is installed on the fixing shell, and an output shaft of the motor is in transmission with the partition piece through a gear set. The flow direction of materials is guided through the flow guide folded plate, so that most of the materials pass through the temperature sensor in the downward flowing process, and the monitoring precision of the device on the temperature of the materials at different positions is improved.

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture (1) in a plant comprising an etherification unit (3), a first distillation unit (5), an ether cleavage unit (10) and a second distillation unit (12), the process comprising: (a) contacting the C4-hydrocarbon mixture (1) with a primary alcohol (2) and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether in the etherification unit (3); (b) distilling the reaction mixture (4) from the etherification unit (3) in the first distillation unit (5), a C4-hydrocarbon raffinate being withdrawn as the overhead product (6), and the alkyl tert-butyl ether being withdrawn as the bottom product (7); (c) vaporizing the bottom product from the first distillation unit (5) in an evaporator (8) obtaining a vapor stream (9); (d) reacting the vapor stream (9) of step (c) in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (10); (e) distilling the reaction mixture (11) from the ether cleavage unit (10) in the second distillation unit (12), isobutene being withdrawn as the overhead product (13), the primary alcohol and diisobutene being withdrawn as the bottom product (14) and being recycled to the etherification unit (3); wherein a purge stream (15) containing high boiling components with a normal boiling point higher than that of the alkyl tert-butyl ether is withdrawn from the evaporator (8) in step (c).

A method for producing a (poly)alkylene glycol monoalkyl ether includes reacting an olefin and a (poly)alkylene glycol in a reactor in a presence of a catalyst. The method also includes recovering at least a portion of raw materials used for the production to use the recovered raw materials again as a raw material, where at least one of the recovered raw materials contains an olefin. A mass of a branched olefin relative to a mass sum of the branched olefin and a linear olefin contained in the recovered raw materials is controlled not to exceed 20 mass %.

The invention relates to a method and device for preparing low-carbon olefins, and the method comprises the following steps: S1, contacting raw oil with a catalytic conversion catalyst in a catalytic conversion reactor for catalytic conversion reaction to obtain a catalytic conversion reaction product; s2, separating the catalytic conversion reaction product to obtain ethylene and propylene as well as a first circulating olefin flow containing butene and / or a second circulating olefin flow containing C5 + olefin; s3, enabling the olefin material to enter an etherification unit, and contacting the olefin material with an alcohol raw material under an etherification condition to obtain a circulating ether material and etherified olefin; and S4, enabling at least one part of etherified olefin to enter an isomerization unit, and carrying out isomerization reaction in the presence of an isomerization catalyst to obtain isomerized olefin. According to the method disclosed by the invention, the conversion of ethers into low-carbon olefins can be realized, the yield and selectivity of ethylene and propylene are improved, the yield of methane is reduced, the content of methanol in the product is reduced to the greatest extent, and the conversion of low-cost methanol into low-carbon olefins is realized.

This application relates to the field of organic synthesis technology, specifically disclosing a process for preparing tert-butyl vinyl ether. The raw materials include solid tert-butanol, acetylene, tetrahydrofuran solvent, and potassium hydroxide catalyst, supplemented with auxiliary materials such as type 3A molecular sieves and activated alumina adsorbents. The preparation method involves: after dehydration and purification of the raw materials, the materials are introduced into a reaction vessel; temperature and pressure are controlled, and the reaction endpoint is monitored using an infrared spectrometer; byproducts are quenched and acetylene is recovered; the process involves multi-stage condensation, water washing to remove impurities, distillation separation, and solvent purification and recycling, with simultaneous integration of waste heat recovery and continuous material feeding. The tert-butyl vinyl ether prepared by this process, as an important fine chemical intermediate, can be used in coatings, adhesives, and polymer material modification, possessing advantages such as high purity and good stability. The preparation method achieves efficient utilization of materials and energy through multi-stage synergistic linkage, combining the advantages of green environmental protection, continuous and stable operation, and high resource utilization.

Provided is a method for effectively reducing the concentration of a hydrofluoroether-olefin (HFEO) contained in a mixture comprising a hydrofluoroether (HFE) and the HFEO. This method for reducing the concentration of an HFEO is one in which the HFE is a compound (A) represented by formula (1) and the HFEO is a compound (B) represented by formula (2), the method comprising reacting the compound (B) contained in the mixture with a compound (C) which is any of an alcohol, chlorine, and hydrogen.　(1): R2-O-R1-O-R3 (2): R2-O-R1-O-R4 In formulae (1) and (2), R1 is a C1-C4 alkylene group, R2 and R3 are each independently a C2-C4 fluoroalkyl group, and R4 is a C2-C4 fluoroalkenyl group.

A system for producing ether includes a first etherification reactor system containing first catalyst and producing a first reaction effluent when supplied with alcohol and olefinic hydrocarbon feedstock, a second etherification reactor system containing second catalyst and producing a second reaction effluent when supplied with the first reaction effluent, and a distillation column receiving the second reaction effluent at a feed-point between the bottom and the top of the distillation column. The produced ether is taken out from the bottom of the distillation column. Volume of the first catalyst contributing the production of the first reaction effluent is at most 15% of total volume of the first catalyst and the second catalyst contributing the production of the second reaction effluent. The first etherification reactor system acts as a guard-bed reactor which removes unwanted components from the feed and thus protects the second etherification reactor system.

A process for producing ethylene and at least one of butanol and an alkyl tert-butyl ether from field butane includes separating the field butane into an n-butane stream and an isobutane stream; cracking the n-butane stream to obtain a cracked product stream comprising n-butane, 1- butene, 2-butene, butadienes, or a combination comprising at least one of the foregoing; and at least one of the following: (1) separating the cracked product stream to obtain a butane stream and a butene stream, and reacting the butene stream with water to obtain a fuel additive comprising butanol, and (2) dehydrogenating the isobutane stream in a dehydrogenation unit to form an isobutene stream and reacting the isobutene stream with an aliphatic alcohol to produce an alkyl tert-butyl ether.

Systems and methods for processing a C3 and C4 hydrocarbon mixture have been disclosed. The C3 and C4 hydrocarbon mixture is first processed in an isomerization unit to isomerize n-butane to form isobutane. The resulting effluent stream from the isomerization unit comprising primarily isobutane and C3 hydrocarbons, collectively, is flowed into a separation unit configured to separate the effluent stream to form a C3 stream comprising C1 to C3 hydrocarbons and a C4 stream comprising primarily isobutane. The isobutane in the C4 stream is further dehydrogenated to form isobutene, which is further flowed into an MTBE synthesis unit as a feedstock for producing MTBE.

The present application relates to the technical field of fluorine-containing intermediate synthesis, and specifically discloses a synthetic method of 2-bromo-2,3,3,3-tetrafluoroethyl propionate. A synthetic method of 2-bromo-2,3,3,3-tetrafluoroethyl propionate, comprising the following steps: addition reaction: using hexafluoropropylene and ethanol to carry out addition reaction under the action of a base catalyst to obtain 1,1,2,3,3,3-pentafluoropropyl ether; hydrolysis reaction: 1,1,2,3,3,3-pentafluoropropyl ether is hydrolyzed under the action of an acid catalyst to obtain 2,3,3,3-tetrafluoroethyl propionate; bromination reaction: 2,3,3,3-tetrafluoroethyl propionate and a bromination agent are subjected to bromination reaction to obtain 2-bromo-2,3,3,3-tetrafluoroethyl propionate. The synthetic method in this application, not only has high yield, and the raw material source is simple and corrosion-free, the reaction is simple and easy to operate, the process is simple and suitable for industrial production, low cost, and high economic benefit.

A method for supplying deaerated water to a chemical plant, wherein the chemical plant includes a distillation column for separating a reaction effluent including water and a product. The method includes charging aerated water (water having an oxygen content greater than 50 ppbw, such as greater than 1 ppmw) to the distillation column. The aerated water in the distillation column can then be distilled to produce an oxygen-containing overhead and a bottoms fraction including deaerated water. The deaerated water in the bottoms fraction can be transported to and utilized in upstream or downstream unit operations. The reaction effluent is fed to the distillation column, converting the distillation column from an operation that separates oxygen from water to an operation that separates the product from water.

This invention provides novel fluorine-containing diether compounds. [Solution] Formula (1) below: JPEG2026065628000011.jpg30128 (In formula (1), R1 represents a fluorine atom or a perfluoroalkyl group having 1 to 10 carbon atoms, R2 may be the same or different, consisting of a methyl group, an ethyl group, -CH2CF3, or -CH2(C2F4). n Showing H n represents an integer between 1 and 10 (inclusive). A fluorine-containing diether compound represented by the following:

The present invention relates to the preparation and application of difluoroalkene oxime ether derivatives. The general structural formula of the difluoroalkene oxime ether derivatives is shown in formula (I):. It has been found through research that the difluoroalkene oxime ether derivatives disclosed in the present invention have good biological activities against common and severely harmful agricultural pests / mites such as Plutella xylostella, Ostrinia furnacalis, Spodoptera frugiperda, and Tetranychus cinnabarinus. Therefore, they can be used as insecticidal / acaricidal candidate substances for the development of new, highly efficient, low-toxic, and environmentally friendly insecticides.

The present disclosure relates to processes for producing isobutylene and isobutylene- based polymers. In some embodiments, a process includes dehydrating a bio-based isobutanol in an isobutanol dehydration unit to form a butenes composition. The process includes providing the butenes composition to one or more of an acid extraction unit or a butyl ether formation unit.

The present invention relates to a method of preparing methyl tert-butyl ether including a reaction step of reacting methanol with iso-butene in the presence of an acid catalyst to generate methyl tert-butyl ether; and a purification step of purify the reaction product obtained by the reaction step by introducing the reaction product into a reaction distillation column including a packing stage containing an acid catalyst, wherein a flow ratio of a recycle to a fresh feed is different per the volume of each reactor. Accordingly, the amount of unreacted iso-butene and the amount of impurities included in the reactor may be reduced, resulting in reduction of the amount of thermal energy used in a reaction distillation column. [Representative Figure] FIG. 1

The invention relates to a process for producing high-purity 1-butene and high-purity isobutene from two C4 hydrocarbon streams, in which the two streams are partially processed together. Furthermore, the present invention also relates to an apparatus for carrying out the process according to the invention.

The present invention relates to the field of fine chemical technology, particularly to the field of IPC C07C303. More specifically, it relates to a cycloaliphatic ethoxylated sodium bisphenol sulfonate and a preparation method thereof. The general structural formula is shown in Formula 1: wherein X comprises one of O, CH2, and (CH3)2C, and R comprises an unsaturated ring. The preparation method comprises the following steps: S1, an etherification reaction: adding a cycloolefin, an ethoxylated bisphenol compound, and an acidic catalyst to a reaction solvent, heating the reaction, and removing the solvent, catalyst, and excess cycloolefin to obtain an alicyclic ethoxylated bisphenol intermediate; S2, a sulfonation neutralization reaction: cooling the intermediate, adding a sulfonating reagent dropwise for reaction, and post-treating the intermediate to obtain the product. The preparation method is simple and mild, and the product has good water solubility and surface activity.

A system for producing ether includes a processing system that receives alcohol and olefinic hydrocarbon feedstock and includes a first etherification reactor system that produces a first reaction effluent. A distillation column system receives a mixture containing the first reaction effluent to produce ether. A side flow outlet withdraws a side flow from the distillation column system and a second etherification reactor system receives the side flow and produces a second reaction effluent. The second reaction effluent is mixed with the first reaction effluent, and this mixture is supplied to the distillation column system. The side flow makes it possible to produce a given amount of ether with a smaller amount of catalyst material.

A method of producing a fuel additive includes passing a feed stream comprising C4 hydrocarbons through a methyl tertiary butyl ether unit producing a first process stream; passing the first process stream through a selective hydrogenation unit producing a second process stream; passing the second process stream through an isomerization unit producing a third process stream; and passing the third process stream through a hydration unit producing the fuel additive and a recycle stream.

A process for making hydrofluoroethers, the process comprising: •A) providing a mixture comprising one more polar aprotic organic solvents having a boiling point measured at 1 atm (1.01 bar) of from 60° C. to 170° C. and one or more chemical compounds carrying at least one —OH group which is part of an alcohol or of a phenol group, and •B): reacting said one or more chemical compounds carrying at least one —OH group with one or more fluorinated olefin in the presence of a basic catalyst thus providing a reacted mixture comprising one or more hydrofluoroethers.

This production method of a fluorine-containing polyether compound involves producing the compound of formula (3) by reacting the compound of expression (1) and the compound of expression (2) in a ratio such that the compound of formula (2) exceeds 1 mol per 1 mol of the compound of expression (1), esterifying, fluorinating and subsequently reacting with an alcohol to produce a fluorine-containing polyether compound in which both terminals have been functionalized. Here, R1 represents a fluorine atom, etc., R2 and R3 represent a divalent hydrocarbon group of 1-20 carbons.　(1) ... CF2=CR1-O-R2-O-CR1=CF2, (2) ... HO-CH2R3CH2-OH

The present disclosure provides a method and system for producing an alkyl tert-butyl ether, the method including separating a mixed hydrocarbon stream into a C3-rich stream and a C4-rich stream; separating the C4-rich stream into an isobutane stream and an n-butane stream; dehydrogenating the isobutane in the isobutane stream to form an isobutene stream; compressing the isobutene stream to form a condensed liquid stream and a gaseous stream; treating the gaseous stream and the C3-rich stream in a low temperature recovery system to form a purified product stream and a light gas stream; separating at least a portion of the C3 impurities from the purified product stream and the condensed liquid stream to form a purified C4 stream; and reacting the purified C4 stream with an alkanol in a reactor to form an alkyl tert-butyl ether product stream.

The invention provides an ethyl tert-butyl ether preparation method, which comprises: carrying out at least two-stage etherification reaction on a C4 raw material and ethanol to obtain a pre-product; carrying out reactive distillation on the pre-product, wherein the reactive distillation comprises stripping treatment and reactive distillation treatment; the pre-product is subjected to stripping treatment, an ethyl tert-butyl ether product is extracted, and a C4 and ethanol mixture obtained through separation is subjected to reactive distillation treatment; ethyl tert-butyl ether obtained through reactive distillation treatment is returned for stripping treatment, and C4 and ethanol obtained through reactive distillation separation are subjected to ethanol recovery treatment. According to the preparation method, stripping of reactive distillation and reactive distillation are carried out separately, and ethyl tert-butyl ether in a pre-product and unreacted C4 and ethanol are separated before reactive distillation, so that the raw material conversion rate of the reactive distillation step is greatly improved, and the overall conversion rate of isobutene is further improved; and meanwhile, the purity of the ethyl tert-butyl ether product extracted by reaction distillation is improved.

The invention discloses a reaction kettle for catalytic synthesis reaction and a use method of the reaction kettle. The reaction kettle comprises a kettle body (4); the stirring mechanism comprises a driving device (2) and a stirring paddle (5) arranged in the kettle body (4); and the intrusive pressure-bearing gas guide structure comprises a gas guide tube section (3) extending into the kettle body (4). The tail end of the gas-guide tube section (3) is positioned in a mixing area acted by blades of the stirring paddle (5), and a plurality of gas-guide holes (9) are formed in the tube wall of the gas-guide tube section (3). The structure is used for directly introducing a pressurized gas-phase raw material into a liquid reaction system in the kettle, so that a traditional gas-liquid two-dimensional interface is broken under the stirring action, and three-dimensional dispersion and efficient mass transfer of the gas-phase raw material in a liquid phase are realized. According to the invention, the interface contact and mass transfer efficiency in the gas-liquid-solid heterogeneous catalytic reaction is obviously improved, and the method is especially suitable for a distributed catalytic synthesis process requiring a high catalyst utilization rate.

The invention relates to a process for obtaining isobutene from an isobutene containing C4-hydrocarbon mixture (1) in a plant comprising an etherification unit (3), a first distillation unit (5), an ether cleavage unit (8) and a second distillation unit (10), the process comprising: (a) contacting the C4-hydrocarbon mixture (1) with a primary alcohol (2) and reacting the mixture with the primary alcohol in the presence of an acidic catalyst to form the corresponding alkyl tert-butyl ether as an intermediate product and diisobutene as a by-product in the etherification unit (3); (b) distilling the reaction mixture (4) from the etherification unit (3) in the first distillation unit (5), a C4-hydrocarbon raffinate being withdrawn as the overhead product (6), the alkyl tert-butyl ether and diisobutene being withdrawn as the liquid or vaporous bottom product (7), and vaporizing the bottom product (7) if it is withdrawn as a liquid; (c) reacting the vaporous bottom product (7) in the presence of an acidic catalyst obtaining isobutene and the primary alcohol as reaction products in the ether cleavage unit (8); (d) distilling the reaction mixture (9) from the ether cleavage unit (8) in the second distillation unit (10), isobutene being withdrawn as the overhead product (11), the primary alcohol and diisobutene being withdrawn as the bottom product (12) and being recycled to the etherification unit (3); the plant further comprising a byproduct separation unit (15) being fed by a bottom purge stream (13) of the first distillation unit (5) and / or by a part of the bottom product of the second distillation unit (10), this feed stream (14) being split up in at least three byproduct streams wherein a first byproduct stream (16) is rich in diisobutene, a second byproduct stream (17) is rich in the primary alcohol, and a third byproduct stream (18) is rich in components with a normal boiling point higher than 110° C.