44results about "Preparation by hydroxy group addition" patented technology

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 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 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.

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 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.

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.

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.

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.

The invention provides a method for co-producing 3-methoxy-3-methylbutanol and 3-methyl-1, 3-butanediol, the selectivity of 3-methoxy-3-methylbutanol and 3-methyl-1, 3-butanediol can be flexibly adjusted according to production requirements by adopting the method provided by the invention, specifically, under the action of an acid catalyst, the selectivity of 3-methoxy-3-methylbutanol and 3-methyl-1, 3-butanediol can be flexibly adjusted, and the yield of 3-methoxy-3-methylbutanol and 3-methyl-1, 3-butanediol can be improved. 3-methyl-3-butenol reacts with methanol and water, and the selectivity of 3-methoxy-3-methyl butanol and 3-methyl-1, 3-butanediol is controlled by controlling the ratio of 3-methyl-3-methyl-1-butanol to methanol to water, so that the purpose of adjusting the selectivity of the two products is achieved. The method has the characteristics of high selectivity, few three wastes, large selectivity adjusting range, high production operation elasticity and low cost.

The present invention relates to a method of preparing isopropyl alcohol, the method including: supplying a feed stream including a propylene monomer and water to a reaction unit and allowing a reaction to proceed to produce a reaction product including isopropyl alcohol, a propylene monomer, and water; supplying each of a first stream including a vapor phase reaction product and a second stream including a liquid phase reaction product that are discharged from the reaction unit to an absorption column of a purification unit; and discharging a third vapor phase stream including the propylene monomer through an upper portion of the absorption column to be circulated to the reaction unit, and discharging a fourth liquid phase stream including water and isopropyl alcohol through a lower portion of the absorption column to be fed to an isopropyl alcohol purification unit, wherein the purification unit includes one or more heat exchangers, and when the third stream is circulated to the reaction unit, the third stream is converted from a vapor phase to a liquid phase through the one or more heat exchangers provided in the purification unit, and then transferred.

This invention discloses a highly efficient composite solubilizer for the hydration of butene to sec-butanol, belonging to the field of chemical process technology. Its composition includes: 0-60 parts of a polyether-based polymeric surfactant, 15-35 parts of a highly polar aprotic solvent, and 10-20 parts of a co-catalyst. The main solubilizing component of this invention disperses oily butene into extremely small droplets, allowing it to mix uniformly in water, thereby increasing the surface area for the reaction. The co-solvent, as the main component, provides a stable environment, ensuring that this highly mixed state is maintained for a certain period. The added additives, possessing both water and oil solubility, facilitate smoother dissolution of the mixture and help the reactants quickly contact the active sites of the catalyst. This accelerates the reaction rate of butene and water, significantly improving the efficiency of the one-time conversion to sec-butanol and greatly saving the large amount of energy required for material recycling.

Provided is a method for preparing isopropyl alcohol including: (S1) passing reaction water through a first heat exchanger and a second heat exchanger to heat the reaction water, (S2) supplying the reaction water passed through the second heat exchanger to a reactor as a feed stream with a propylene monomer to produce a gaseous reaction product including isopropyl alcohol (IPA), (S3) purifying the isopropyl alcohol from the gaseous reaction product and recovering process water, and (S4) passing the process water through the second heat exchanger to cool the process water, and transferring a portion of the cooled process water to the first heat exchanger, wherein the reaction water is brought into contact with the portion of the cooled process water in the first heat exchanger for primary heating, and then brought into contact with the process water in the second heat exchanger for secondary heating.

Provided are a method for preparing isopropyl alcohol and an apparatus for the same. The method includes performing a gas phase reaction by supplying a feed stream including a propylene monomer and water to a reactor in the presence of a catalyst; partially condensing a reaction product of 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; measuring a PH of the liquid phase reaction product to calculate a catalyst content, and supplementing an amount of a Catalyst corresponding to the calculated catalyst content to the reactor; and dissolving isopropyl alcohol included in the gas phase reaction product in absorbing water and separating the isopropyl alcohol in the absorption column.

A method of making a mesoporous single metal atom catalyst is provided, the method comprising: (a) forming a layer of silica on surfaces of a zeolitic imidazolate framework (ZIF) material to provide a silica coated ZIF material; (b) pyrolyzing the silica coated ZIF material to provide a pyrolyzed silica coated ZIF material; removing the layer of silica from the pyrolyzed silica coated ZIF material to provide an etched ZIF material; and oxidizing the etched ZIF material to provide a mesoporous single metal atom catalyst. The mesoporous single metal atom catalysts and electrolyzers and cascade systems comprising the catalysts are also provided. Methods of using the electrolyzers and cascade systems are also provided.

The invention provides a heteroatom modified HZSM-5 molecular sieve as well as a preparation method and application thereof. The heteroatom modified HZSM-5 molecular sieve comprises an HZSM-5 molecular sieve framework and a positive tetravalent heteroatom M which is bonded on the HZSM-5 molecular sieve framework in an M-O bond form, the heteroatom M is any one or a combination of at least two of IVB group elements or non-carbon and non-silicon IVA group elements; the distribution uniformity index value of heteroatoms M in the heteroatom modified HZSM-5 molecular sieve is less than or equal to 3.29%; the total acid amount of the heteroatom modified HZSM-5 molecular sieve is not less than 515 [mu] mol / g; the contact angle between the heteroatom modified HZSM-5 molecular sieve and water is 13.5 to 21 degrees. According to the invention, the catalytic activity of the catalyst on cyclohexanol prepared by cyclohexene hydration can be improved.

The present invention relates to a method for preparing isopropyl alcohol, the method including: feeding a feed stream containing a propylene monomer and water to a reaction unit to allow the propylene monomer and the water to react to each other, resulting in a reaction product containing isopropyl alcohol, the propylene monomer, and the water; feeding each of a first discharge stream containing a vapor-phase reaction product discharged from the reaction unit and a second discharge stream containing a liquid-phase reaction product discharged from the reaction unit to a stripper; and separating a top discharge stream containing the propylene monomer and a bottom discharge stream containing the water and the isopropyl alcohol, from the stripper, wherein the first discharge stream is condensed through a first heat exchanger and is fed to the stripper in a liquid-phase.

The invention discloses terpilenol multi-stage heating reaction equipment, and relates to the technical field of multi-stage heating reaction equipment, the terpilenol multi-stage heating reaction equipment comprises a heating tank, and an adjustable pressure relief protection mechanism is arranged at the position, close to the upper portion, of the heating tank. The terpilenol multi-stage heating reaction equipment disclosed by the invention has the advantages that when terpilenol multi-stage heating treatment is carried out, the air pressure in the heating tank is increased, the air impacts the pressure ball, so that the adjusting spring rod is compressed, the pressure ball moves to the upper part of the two flow guide pipes, the air gradually flows into the corresponding storage air bags through the two flow guide pipes, and the air pressure in the heating tank is reduced; the initial shape of the storage air bag is in a twist shape, when the air pressure increasing speed is larger than the air transfer speed, the pressure ball is squeezed again, the trigger rod makes contact with the pressure sensor, the forward and reverse rotation motor is started, the forward and reverse rotation motor drives the twist-shaped storage air bag to rotate and unfold, the air rapidly flows into the storage air bag, and pressure relief operation is completed. And the safety effect in the operation process of the heating tank is ensured.

The invention provides a method for synthesizing ethylene glycol from ethylene, which comprises the following steps: in the presence of a free radical inhibitor, ethylene, hydrogen peroxide and a titanium silicalite molecular sieve are contacted in a mixed solution of water and an optional organic solvent to carry out oxidation-hydration one-step reaction, and the addition amount of the free radical inhibitor is 0.005-5wt% of the addition amount of the hydrogen peroxide. By introducing the efficient free radical inhibitor and selectively inhibiting a side reaction path, generation of acidic impurities is remarkably reduced, selectivity and product purity of ethylene glycol are improved, and the method is suitable for industrial production.

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

This invention provides a nickel-based catalyst and its application, as well as a method for nickel-catalyzed asymmetric hydration of olefins, belonging to the field of organic synthesis technology. The nickel-based catalyst and method for nickel-catalyzed asymmetric hydration of olefins provided by this invention systematically study the asymmetric hydration reaction of inactive olefins catalyzed by nickel, overcoming the generally considered problem of uncontrollable chirality in classical hydration reactions. Furthermore, it achieves the conversion of various terminal inactive olefins into chiral alcohols, with a wide range of applicable olefin substrates, suitable for the synthesis of a series of dialkyl chiral alcohols with various functional groups.

The invention belongs to the technical field of chemical engineering, and relates to a method for removing impurities in cyclohexanol prepared from cyclohexene, which comprises the following steps: a, carrying out hydration reaction on cyclohexene and water under the action of a catalyst in a hydration reaction system to obtain a first mixed solution containing cyclohexene and cyclohexanol, b, the first mixed solution is rectified in a first separation tower, a first cyclohexene solution containing cyclohexene is obtained in the middle of the tower, the second mixed solution is rectified in a second separation tower, a second cyclohexene solution is obtained at the top of the tower, a fourth mixed solution containing cyclohexene and cyclohexanol is obtained in a cyclohexene recovery tower, and a third mixed solution containing cyclohexene and cyclohexanol is obtained in the middle of the tower; and c, feeding the first cyclohexene solution and the second cyclohexene solution to a hydration reaction system in the process a, and feeding the fourth mixed solution to the lower part of a first separation tower in the process b for rectification. According to the invention, the content of cyclohexanol in the feedstock for removing the fourth impurities is reduced, and the loss of cyclohexanol is reduced.

The invention relates to the technical field of cyclopentanone production, in particular to a device for preparing cyclopentanone by hydrating and dehydrogenating cyclopentene, which comprises a hydration reaction unit, a solvent recovery unit, a cyclopentanol refining unit, a catalytic dehydrogenation unit and a cyclopentanone refining unit which are connected in sequence, the cyclopentanol refining unit comprises a heavy component removal tower, a water recovery tower, a phase separation tank and a cyclopentanol refining tower; wherein the de-heavy tower is connected to the solvent recovery unit; the split-phase tank is respectively connected to the heavy component removal tower, the water recovery tower and the cyclopentanol refining tower; and the cyclopentanol refining tower is connected to the catalytic dehydrogenation unit. Carrying out addition reaction on cyclopentene to generate cyclopentanol; carrying out oxidation reaction on the cyclopentanol to generate cyclopentanone; wherein the addition reaction catalyst is strongly acidic cation exchange resin modified by quaternary ammonium salt groups. According to the invention, the defects of a device for preparing cyclopentanone by hydrating and dehydrogenating cyclopentene in the aspects of reaction efficiency, separation effect and energy consumption are effectively overcome, and the purity and industrial production value of a cyclopentanone product are greatly improved.