105results about "Preparation by hydroxy group addition" patented technology

The invention belongs to the technical field of alkane processing, and particularly relates to a process for preparing isopentene by dehydrogenation of isopentane, a catalyst and a tert-amyl alcohol preparation process. The process for preparing isopentene by dehydrogenation of isopentane comprises an isopentane dehydrogenation device and an isopentene separation device, in the isopentane dehydrogenation device, a dehydrogenation reactor is a fixed bed adiabatic reactor and is filled with a Pt-Sn-K / alumina type alkane dehydrogenation catalyst, the catalyst has hydromethanation performance under the CO2-containing dehydrogenation reaction condition, and the arrangement and operation of a dehydrogenation reactor group comprise a mode A, a mode B or a mode C; the isopentene separation device comprises a cooling separation system, a pressure swing adsorption separation system and an optional rectification system. The tert-amyl alcohol is further prepared from isoamylene under the conditions of a fixed bed hydration reactor, ethylene glycol monobutyl ether and other solvents, and the tert-amyl alcohol product is obtained through separation. The process is superior to the prior art on the whole, and has certain application prospects.

The invention belongs to the technical field of chemical engineering, and relates to a method and a device for utilizing latent heat of a tower top gas phase in cyclohexanol preparation. Comprising a first separation tower, a second separation tower and the like, a tower top gas phase outlet of the second separation tower is connected with a hot side inlet of a second tower condenser, and a cold side outlet of the second tower condenser is connected with the first separation tower; a tower top gas phase outlet of the cyclohexene recovery tower is connected with the first separation tower; a tower top gas phase outlet of the cyclohexanol refining tower is connected with a hot side inlet of a refining tower condenser, and a cold side outlet of the refining tower condenser is connected with the second separation tower through a pipeline; an outlet of the hydration reaction system is connected with the first separation tower, and a tower kettle liquid phase outlet of the first separation tower is connected with an inlet of the second separation tower through a pipeline; a side line outlet of the first separation tower is connected with the hydration reaction system. The tower top gas phase latent heat of the second separation tower, the cyclohexene recovery tower and the cyclohexanol refining tower is recycled, so that the energy consumption in the cyclohexanol production process is reduced.

A quaternary ammonium salt that has a specific structure, an organic structure-directing agent that contains this quaternary ammonium salt, and a method for producing a quaternary ammonium salt. Also, a CON-type zeolite that is mixed crystal in which the molar ratio (Si / Al) of silicon (Si) and aluminum (Al) is from 200 to 2000 and that contains 25 mass% or more of polymorph A, a catalyst containing a CON-type zeolite, and a method for producing a lower olefin using this catalyst.

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.

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 utility model relates to the technical field of petrochemical engineering, and discloses a C4 integrated device which comprises a countercurrent multistage reactor, a reduced pressure rectifying tower and an azeotropic rectifying tower which are arranged on the same straight line, a mixed C4 feeding hole and a catalyst feeding hole are formed in one side of the countercurrent multi-stage reactor, the bottom end of the countercurrent multi-stage reactor is connected with a reactor discharging pipe, and one end, far away from the reduced pressure rectifying tower, of the reactor discharging pipe is connected with a feeding hole of the reduced pressure rectifying tower; through the pressure transmitter, the component analysis probe and the temperature sensor, the temperature, pressure and component change in the azeotropic rectifying tower can be monitored in real time, so that the temperature gradient in the azeotropic rectifying tower can be adjusted by controlling the flow of cooling liquid and the flow of steam, the probability of C4 azeotrope interference is reduced, and temperature capture can be carried out on key positions such as a rectifying section and a stripping section.

There is provided a method for producing isobutylene, in which isobutylene is produced from isobutanol with a high selectivity while suppressing a decrease in the isobutanol conversion rate under pressure. In the method for producing isobutylene according to the present invention, a raw material gas containing isobutanol is brought into contact with a catalyst to produce isobutylene from isobutanol, the method including bringing the raw material gas containing isobutanol into contact with a catalyst at a linear velocity of 1.20 cm / s or more under a pressure of 120 kPa or more in terms of absolute pressure to produce isobutylene from isobutanol.

Provided is a method for preparing isopropyl alcohol, and in the method for preparing isopropyl alcohol, a propylene monomer and water are reacted in a reactor to prepare a reaction product including isopropyl alcohol, all or a part of the reaction product stream is heat exchanged with a side stream of the gas purification column and cooled, and the cooled reaction product is supplied to an absorption tower to reduce energy usage.

The invention relates to the technical field of fine chemical engineering, in particular to a method for preparing cyclopentanol based on one-step synthesis of cyclopentene, which comprises the following steps: step 1) preparation of a modified strongly acidic cation exchange resin catalyst; (2) synthesizing by a one-step method; step 3) separation; and 4) purifying. In the step (2), under the inert atmosphere, the modified strong-acid cation exchange resin catalyst, cyclopentene, n-amyl alcohol and water are mixed and react; wherein the molar ratio of the cyclopentene to the water is (3-5): 1, the addition amount of the n-amyl alcohol is 1.0-2.0 times of the mass of the cyclopentene, and the n-amyl alcohol and the water form a cosolvent system. The method has the advantages that the process route is clean, efficient and pollution-free, the conversion per pass is high, the product is easy to separate, the low-temperature physical property of the product is good, the solvent and reactants in the whole reaction process can be repeatedly used, efficient and environment-friendly hydration preparation of cyclopentanol from cyclopentene can be realized, and the method has a good industrial application prospect.

A method of producing a fuel additive includes passing a feed stream comprising C4 hydrocarbons through a hydrogenation unit producing a hydrogenated stream; passing the hydrogenated stream through a distillation unit producing a first stream and a second stream; producing an isobutylene stream by passing the first stream through a molecular sieve unit; passing the isobutylene stream to a hydration unit as a feedstock for the fuel additive; and forming the fuel additive in the hydration unit.

The application discloses a method for preparing adipic acid from cyclohexene by electrocatalysis, which comprises the following steps: (I) generating hydrogen peroxide by electrocatalytic reduction of oxygen at a cathode; (II) reacting the hydrogen peroxide with cyclohexene to obtain cyclohexanediol; (III) generating adipate by electrocatalytic oxidation reaction of the cyclohexanediol at an anode; and (IV) obtaining solid adipic acid by acidification, washing and drying of the adipate. The method utilizes renewable energy to drive the electrochemical reaction and realizes the cascade reaction from cyclohexene to adipic acid. The preparation method is mild, green and environmentally friendly, and has high product selectivity. The cathode oxygen reduction and the anode cyclohexanediol oxidation are performed by using renewable energy, the hydrogen peroxide generated at the cathode reacts with the cyclohexene in a flow system to generate the cyclohexanediol, the reaction solution can be directly injected into the anode for reaction, and only oxygen, dilute alkali solution and dilute acid solution are input in the reaction process in addition to the cyclohexene, thereby avoiding the use of strong acid and strong oxidant.

The present invention relates to a method for preparing isopropyl alcohol, comprising the steps of: supplying a propylene monomer and reaction water as a feed stream to a reactor to produce a gas-phase reaction product comprising isopropyl alcohol; purifying isopropyl alcohol from the gas-phase reaction product and recovering process water; and passing the process water through an arsenic removal device comprising a first filtration layer, an adsorbent layer, and a second filtration layer.

The present invention provides processes for the purification of semifluorinated alkanes of the Formula (SFA) comprising formation of solid complexes comprising the semifluorinated alkane and urea, processes for the preparation of the solid complexes and the semifluorinated alkanes derived therefrom. Also provided are pharmaceutical compositions comprising the semifluorinated alkanes and uses thereof in the treatment of dry eye disease. F3C(CF2)x(CH2)yCH3 (SFA)

The present application relates to a kind of modified silicon-aluminum catalytic materials and its preparation method and application, which comprises: (1), the first electrically conductive object and the second electrically conductive object connected with the positive and negative of direct current power respectively are placed in aqueous solution containing silicon source and inorganic base, electrolysis is carried out under the voltage of 2-10V for 1-5 days, and mixed liquor is obtained;Wherein, the first electrically conductive object is graphite forming body;(2), the mixed liquor is mixed with silicon-aluminum catalytic material, then is transferred into heat-resistant closed container, and hydrothermal reaction is carried out under the condition of 100-250 DEG C, autogenous pressure for 12-36 hours, and solid product is collected and optionally calcined.The modified silicon-aluminum catalytic material prepared by the method of the present application has more optimal reaction activity, selectivity of target product and activity stability.

The invention relates to the field of chemical engineering, in particular to a preparation method of a sodium tert-amyl alcohol production raw material. According to the preparation method provided by the invention, isoamylene and water are used as raw materials, and in the presence of a solid acid catalyst, a hydration reaction is carried out in a fixed bed reactor under a gas phase condition without using a solvent to generate tert-amyl alcohol. The process has the characteristics that no solvent is used, the generation of byproducts and the energy consumption of reaction are reduced, the reaction pressure is performed under a low-pressure condition, the reaction raw materials are only isopentene and water, the reaction process is a gas-solid phase reaction, and the mass transfer efficiency is high. The method has the characteristics of simple process flow, low operation temperature, no solvent participation, high raw material conversion rate, high tert-amyl alcohol selectivity and high product purity.

To provide a high-purity 1,3-butylene glycol product that is colorless and odorless and unlikely to cause generation of coloration or odor.SOLUTION: A 1,3-butylene glycol product, wherein at least one of the contents of the following compounds is less than 8 ppm: the content of methyl vinyl ketone, the content of acetone, the content of butyraldehyde, the content of acetaldol, the content of a compound of Formula (1), the content of a compound of Formula (2), the content of a compound of Formula (3), and the total content of a compound of Formula (4) and a compound of Formula (5).SELECTED DRAWING: Figure 1

Provided are a method for preparing isopropyl alcohol including: (S1) supplying a feed stream including a propylene monomer and water to a reactor in the presence of a catalyst to perform a gas phase reaction; (S2) partially condensing a reaction product obtained by the gas phase reaction in a heat exchanger, transferring an uncondensed gas phase reaction product to an absorption column, and transferring a portion of the condensed liquid phase reaction product to a pH measurement system connected on-line between the heat exchanger and the absorption column; (S3) measuring a pH of the liquid phase reaction product transferred to the pH measurement system to calculate a catalyst content, and supplementing an amount of a catalyst corresponding to the calculated catalyst content to the reactor; and (S4) dissolving isopropyl alcohol included in the gas phase reaction product in absorbing water and separating the isopropyl alcohol in the absorption column, and an apparatus for performing the method.

A method for preparing 1,2-propanediol involves reacting propene with hydrogen peroxide, in the presence of a phase transfer catalyst and a heteropolytungstate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase containing a solvent having a solubility in water at 20° C. of less than 500 mg / kg. The method then involves separating the liquid reaction mixture into an aqueous phase containing 1,2-propanediol and an organic phase; recycling at least a part of the separated organic phase to the reaction; and extracting the separated aqueous phase with an extractant solution containing the same phase transfer catalyst and solvent as used in the reaction to provide an extracted aqueous phase and an extract phase. The method further involves recycling at least a part of the extract phase to the reaction and recovering 1,2-propanediol from the extracted aqueous phase.

The invention provides a method for catalyzing free radical-nucleophilic addition halogenation-functionalization of alkene through a visible light induced iron-based material, and belongs to the technical field of organic chemistry. According to the method, olefin is taken as a reaction substrate, inorganic halide MXn is taken as a halogen source, in the presence of a nucleophilic reagent Nu, a halogen functionalization reaction of olefin is efficiently and highly selectively realized through co-catalysis of an iron-based material and visible light, C-X (X = Cl, Br) and C-Y (Y = X, O, S) are constructed at the same time, and a halogen-functionalization product is prepared. According to the method, halide ions are used for replacing traditional halogen simple substances, and olefin which is low in price and easy to obtain is directly converted into the halide which contains a plurality of functional groups and has a high additional value and subsequent derivation potential through free radical-nucleophilic addition under a mild condition. The method has the advantages of environment friendliness, high selectivity, low energy consumption and the like, and has important theoretical significance and practical application value.

The invention discloses a green and environment-friendly synthesis method for preparing a high-crystallinity mesoporous ZSM-5 molecular sieve and application thereof, and belongs to the technical field of catalysts and synthesis thereof. On the basis of a template-free synthesis scheme, a mother liquor waste liquid with a template is added as a seed crystal liquid to prepare a high-crystallinity ZSM-5 molecular sieve, and then the high-crystallinity mesoporous ZSM-5 molecular sieve is prepared through alkali treatment. The ZSM-5 molecular sieve prepared by the invention does not need to be roasted in the whole preparation process, is a green and environment-friendly synthesis route, and can effectively save the production cost and reduce the energy consumption. The molecular sieve has a rich pore structure and a larger specific surface area at the same time, oil and gas components can enter pores of the molecular sieve easily, the diffusion path is short, the mass transfer rate in the reaction process is higher, the generated product can be rapidly diffused out, and the conversion rate of the molecular sieve in the cyclohexene hydration reaction can be effectively improved.

Provided is a high-purity 1, 3-butanediol product which is colorless and odorless (or almost colorless and odorless), is not susceptible to the occurrence of coloration and odor due to the passage of time, and is not susceptible to the occurrence of an increase in acid concentration due to the passage of time even in a water-containing state. The invention discloses a 1, 3-butanediol product. At least one of the content of methyl vinyl ketone, the content of acetone, the content of butyraldehyde, the content of butyraldehyde, the content of the compound represented by formula (1), the content of the compound represented by formula (2), the content of the compound represented by formula (3), and the total content of the compound represented by formula (4) and the compound represented by formula (5) is less than 8 ppm.

The application relates to the technical field of cyclohexene hydration and catalysts, and discloses a modified ZSM-5 molecular sieve and application of the modified ZSM-5 molecular sieve in preparation of cyclohexanol through cyclohexene hydration; the modified ZSM-5 molecular sieve comprises a ZSM-5 molecular sieve core, the core is expanded and then subjected to sulfonation treatment, then SiO2 is coated on the surface of the core to form a core-shell structure; after the core-shell structure is subjected to hydrophobic modification, a zirconium oxide layer is deposited on the surface, and a ZrO2-SiO2@SO3H-ZSM-5 molecular sieve is obtained. The molecular sieve is used as a catalyst in a cyclohexene hydration reaction, the conversion rate is more than 25%, the selectivity is more than 99.5%, and the activity is stable after 6 cycles; the catalyst has excellent catalytic performance, provides a new idea for current two-phase catalytic reactions, and is expected to be applied to an industrialized device for cyclohexene hydration.

A method of preparing isopropyl alcohol (IPA), the method including the steps of (S1) preparing a crude isopropyl alcohol (IPA) product obtained by performing gas purification and isopropyl alcohol purification on a reaction product of propylene and water; (S2) feeding the crude IPA product to a first section of a dividing wall distillation column including the first section, a second section, a top section, and a bottom section; and (S3) in the dividing wall distillation column, separating water and low boiling point organic materials contained in the crude IPA product to the top section, separating high boiling point organic materials and inorganic materials contained in the crude IPA product to the bottom section, and obtaining purified isopropyl alcohol in a liquid phase or a vapor phase to the second region.

Provided is high-purity isopropanol in which the concentration of an acetal compound having 7 to 12 carbon atoms is 100 ppb or less on a mass basis, and in the case where an accelerated test is performed in which the isopropanol is heated at 80°C for 4 hours in a nitrogen atmosphere, the increase in the concentration of the acetal compound relative to the value before the heating is within 30 times, and the value is maintained at 100 ppb or less on a mass basis. Also provided is a method for producing high-purity isopropanol as described above.

Stereoselective methods of producing a stereoisomer of p-menthane-3,8-diol are disclosed, the methods comprising the steps of: hydrating the alkene group of isopulegol, or performing a ring opening reaction on verbenol and hydrogenating and deprotecting the resulting diol. Also disclosed are compositions comprising 95mol% or greater of a stereoisomer of p-menthane-3,8-diol and insect repellents, flavourings or fragrances comprising such compositions. Also disclosed are methods of reducing resistance of a target insect or tick species to a p-menthane-diol repellent.

Provided herein are systems and methods for converting carbon dioxide into ethanol and / or light olefins, such as ethylene and propylene. The systems and methods may be utilized to increase the yield of diverse and usable products by converting an otherwise undesirable light hydrocarbon stream, e.g., from a process for converting carbon dioxide to fuel.

The present invention relates to a method for preparing isopropyl alcohol, comprising the steps of: supplying a propylene monomer and reaction water as a feed stream to a reactor to produce a gas-phase reaction product comprising isopropyl alcohol; purifying isopropyl alcohol from the gas-phase reaction product and recovering process water; and passing the purified isopropyl alcohol through an arsenic removal device comprising a first filtration layer, an adsorbent layer, and a second filtration layer.

The present invention provides a method for producing isopropyl alcohol, comprising the steps of: cooling a reaction product and supplying the cooled reaction product to an absorption tower; and supplying a bottom discharge stream from the absorption tower containing isopropyl alcohol from the absorption tower to an isopropyl alcohol purification section including first to fourth columns, and supplying an upper discharge stream from the absorption tower containing propylene to a gas purification section including fifth and sixth columns, wherein all or a portion of the reaction product is cooled by heat exchange with one or more of the bottom discharge stream from the fourth column and the side discharge stream from the fifth column, the upper discharge stream from the second column is heat exchanged with the bottom discharge stream from the sixth column, and the upper discharge stream from the third column is heat exchanged with one or more of the bottom discharge stream from the first column and the bottom discharge stream from the second column.