182results about "Preparation by hydroxy group addition" patented technology

The invention relates to the technical field of molecular sieves, in particular to a catalyst hydrogen type H-ZSM-5 molecular sieve for cyclohexanol preparation through cyclohexene hydration as well as a preparation method and application of the catalyst hydrogen type H-ZSM-5 molecular sieve. The molecular sieve is based on organic amine as a template agent, a ZSM-5 molecular sieve is prepared through boron isomorphous substitution, sodium ion is exchanged into protons through acid exchange, meanwhile, boron is removed, the hydrogen type H-ZSM-5 molecular sieve with the acid property is prepared, and the hydrogen type H-ZSM-5 molecular sieve serves as a catalyst to be used for a reaction for preparing cyclohexanol through cyclohexene hydration. The method comprises the following steps: adding a boron-containing reagent into synthetic gel for preparing a ZSM-5 molecular sieve for preparing cyclohexanol by hydrating cyclohexene, synthesizing the ZSM-5 molecular sieve by adopting a hydrothermal crystallization method, removing an organic template agent through programmed roasting, exchanging boron and sodium in an acid exchange process, and filtering and washing to obtain the hydrogen-type H-ZSM-5 molecular sieve. The obtained hydrogen type H-ZSM-5 molecular sieve is used as a catalyst for a reaction of preparing cyclohexanol by cyclohexene hydration, so that the yield of cyclohexanol reaches about 11.5%.

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 relates to the field of ion exchange resin, and discloses quaternary ammonium type anion exchange resin, a preparation method and application thereof, and a catalytic hydration reaction method of an epoxy-containing compound. The anion exchange resin comprises a resin matrix # imgabs 0 # and a quaternary ammonium group connected with the resin matrix # imgabs 1 # through an alkylene group; wherein the resin matrix # imgabs2 is a hydrogenated styrene-dienylbenzene copolymer, and the styrene-dienylbenzene copolymer contains a styrene structural unit as shown in a formula (1), a dienylbenzene structural unit as shown in a formula (2), a # imgabs3 # formula (1) and a # imgabs4 # formula (2); in the formula (1), R11 is alkyl or hydrogen, and R12 is alkyl or hydrogen; in the formula (2), n is an integer between 0 and 2. The quaternary ammonium type anion exchange resin provided by the invention has excellent swelling resistance.

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.

The invention relates to the technical field of cyclohexene hydration and catalysts, and discloses a modified ZSM-5 molecular sieve and application thereof in cyclohexanol preparation through cyclohexene hydration. The modified ZSM-5 molecular sieve comprises a ZSM-5 molecular sieve inner core, the inner core is subjected to sulfonation treatment after broaching, and then the surface of the inner core is coated with SiO2 to form a core-shell structure; and carrying out hydrophobic modification on the ZrO2-SiO2 coated SO3H-ZSM-5 molecular sieve, and depositing a zirconium oxide layer on the surface of the ZrO2-SiO2 coated SO3H-ZSM-5 molecular sieve to obtain the ZrO2-SiO2 coated The molecular sieve is used as a catalyst in a cyclohexene hydration reaction, the conversion rate reaches 25% or above, the selectivity reaches 99.5% or above, the activity is still stable after the molecular sieve is recycled 6 times, the catalyst is excellent in catalytic performance, a new thought is provided for a current two-phase catalytic reaction, and meanwhile the molecular sieve is expected to be applied to a cyclohexene hydration industrial device.

The invention relates to the technical field of linalool synthesis, in particular to a decoloring and aroma-keeping method for synthesizing linalool, which comprises the following specific steps: S1, cracking generation: heating beta-pinene to high temperature, and cracking the beta-pinene to generate myrcene; s2, rapid cooling: rapidly cooling the split product myrcene to avoid side reaction; s3, crude sample generation: in the presence of an acid catalyst, myrcene reacts with water to generate linalool, the reaction temperature is 40-80 DEG C, and the reaction time is 4-12 hours; s4, neutralizing the crude sample: after the reaction is finished, neutralizing residual acid by using a sodium bicarbonate solution, and separating an organic phase by using a separating funnel; s5, washing the crude sample: washing the organic layer to be neutral, and removing water-soluble impurities at the same time; s6, purifying the crude sample: adding anhydrous sodium sulfate to dry an organic layer. According to the decoloring and fragrance-keeping method used in the invention, the synthesized linalool is easy to decolor and natural in fragrance, can easily meet the standards of food additives and spice supplies, and has a wide application prospect.

The invention discloses a catalyst and a process for preparing anhydrous tert-butyl alcohol through isobutene hydration, and belongs to the field of industrial catalysis. The preparation method of the catalyst comprises the following steps: after a polyethylene glycol-polyglycerol-polyethylene glycol triblock polymer, tetraethyl orthosilicate and deionized water are subjected to a first mixing reaction, sodium aluminate and sodium tungstate are added for a second mixing reaction to obtain a mixture, the mixture is sequentially subjected to calcination and HCl treatment to obtain a pretreated catalyst carrier, and the pretreated catalyst carrier is dried to obtain the catalyst. The pretreated catalyst carrier, the modified ionic liquid and N, N-dimethylformamide are subjected to a third mixing reaction, and the catalyst is prepared. In the prepared catalyst, the oleophylic group adsorbs isobutene, the hydrophilic group can interact with water molecules, and the two effects cooperate with each other to form a microenvironment beneficial to reaction on the surface of the catalyst, so that the conversion rate of isobutene and the selectivity of anhydrous tert-butyl alcohol are improved.

The invention discloses a green production process for synthesizing 1, 8-terpineol and preparing perfume-grade terpilenol by dehydrating the 1, 8-terpineol, which comprises the steps of hydration reaction, centrifugal separation, acid water recovery, by-product recovery, dehydration reaction and secondary distillation. Wherein the turpentine hydration reaction conditions are as follows: a catalyst is composed of alpha-hydroxy acid and phosphoric acid or boric acid, intermittent stirring is performed at room temperature, the reaction is performed for 2-15 days, an IBC ton barrel can be adopted as a reaction tank, and the mass yield of terpin hydrate is greater than 100%. Citric acid or tartaric acid is adopted to catalyze the dehydration reaction of terpineol hydrate, and the selectivity of terpineol can reach 91% or above. Compared with a traditional process, the method has the advantages that the catalyst is low in corrosivity and does not need an enamel reaction kettle; the reaction is carried out at room temperature, and no cooling equipment is needed; centrifuging to obtain terpin hydrate crystals without alkali neutralization; acid water is easy to recycle, and almost no wastewater is discharged; an IBC barrel is used as a reactor, so that the equipment investment is low.

The invention belongs to the technical field of cyclohexanol production, and particularly relates to a system and a method for improving the conversion rate of cyclohexanol prepared by cyclohexene hydration. The system for improving the conversion rate of cyclohexanol prepared by cyclohexene hydration comprises an alcohol tower I, a first hydration reactor and a second hydration reactor, a cyclohexene inlet and a side line extraction opening are respectively formed in the side wall of the alcohol tower I; the side line extraction port is communicated with an inlet of a first hydration reactor through a side line pipeline, a micro-interface reactor is arranged on the side line pipeline, a catalyst outlet is formed in the bottom of the first hydration reactor, and the catalyst outlet is communicated with a micro-interface mixing device through a catalyst pipeline; the first hydration reactor is communicated with the second hydration reactor through an overflow pipeline. According to the system and the method, on the premise of not changing the existing process operation, the reaction conversion rate of cyclohexanol prepared by a cyclohexene hydration method is improved, the process operation conditions are optimized, the energy consumption is reduced, and the purpose of improving the productivity is achieved.

Embodiments of the present disclosure generally relate to extracts of coal, compositions thereof, and uses thereof. Embodiments of the present disclosure also generally relate to processes for extracting coal. In an embodiment is provided a composition that includes a C4 to C28 alcohol extract of coal. In another embodiment, compositions that include a C4 to C28 alcohol extract of coal are utilized in blends, pavement formulations, crack sealants, shingle coatings, adhesives, fuels, and asphalt or bitumen compositions that resist flow at ambient temperature. In another embodiment, compositions that include a C4 to C28 alcohol extract of coal are converted to a reaction product, where the reaction product is utilized in a pavement formulation or an anti-stripping agent.

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 invention relates to the technical field of cyclohexanol production, in particular to a system and a process for preparing cyclohexanol by cyclohexene hydration. The system for preparing cyclohexanol through cyclohexene hydration comprises an alcohol tower I, a micro-interface mixing device, a first hydration reactor and a second hydration reactor, the middle upper part of the alcohol I tower is communicated with the micro-interface mixing device through a side pipeline, and a side line pump is arranged on the side pipeline; the micro-interface mixing device is communicated with the first hydration reactor through a first pipeline; the first hydration reactor is communicated with the second hydration reactor through an overflow pipeline, and the bottom of the first hydration reactor is communicated with the micro-interface mixing device through a second pipeline; and a slurry pump is arranged on the second pipeline. According to the system for preparing cyclohexanol by hydrating cyclohexene, the technical problem of low conversion rate of cyclohexanol prepared by hydrating in the prior art is relieved, and the energy consumption is reduced.

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.

The invention discloses a preparation method of dicyclopentyl methacrylate, which comprises the following steps: carrying out hydration reaction on dicyclopentadiene serving as a starting raw material to obtain an intermediate I, carrying out hydrogenation reaction to obtain an intermediate II, and carrying out esterification reaction to obtain the dicyclopentyl methacrylate. The reaction temperature is 40-60 DEG C, and the mass ratio of dicyclopentadiene to phosphoric acid is (1.1-1.3): 1; the hydrogenation reaction takes palladium on carbon as a catalyst, the reaction temperature is 38-48 DEG C, and the mass ratio of the intermediate I to the palladium on carbon is 1: (0.001-0.01); the esterification reaction is carried out on the intermediate II and methacryloyl chloride under the catalytic action of an acid-binding agent triethyl diamine, the reaction temperature is-2 DEG C to 5 DEG C, and the molar ratio of the intermediate II to the methacryloyl chloride to the triethyl diamine is 1: (1.2-1.8): (2-3); the product purity reaches 99.80% or above, the total amount of metal impurities is lower than 70 ppb, the quality of the product is far higher than that of commercially available products, and the product meets the quality requirement of a resist raw material for photoresist.

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.

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.

The present invention provides a process for preparing isopropanol (IPA), the process comprising (S1) reacting propylene with water in a reaction unit to obtain a reaction product comprising isopropanol (IPA); (S2) feeding the reaction product to a gas purification unit and separating a gas component comprising unreacted propylene; and (S3) feeding the reaction product from which the gas component has been separated to an IPA purification unit and obtaining purified isopropanol wherein the raw material propylene may be additionally fed to the gas purification unit and the raw material propylene and the unreacted propylene may be purified.

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 invention relates to the technical field of isopropyl alcohol preparation, in particular to a method for producing G5-grade electronic-grade isopropyl alcohol, which comprises the following steps: S1, raw material pretreatment: removing boron by ultrapure water: reducing the content of boron in water to be less than or equal to 0.05 ppb by adopting two-stage serial boron ion selective ion exchange resin and combining a reverse osmosis technology; and propylene hydration reaction: pressurizing process water, namely boron-removed deionized water to 8.4 MPa, respectively exchanging heat with tower kettle water of the azeotropic tower and discharged materials of the reactor, heating to 135 DEG C by a feeding heater to generate a liquid phase, and feeding into the reactor. Through directional boron removal, multi-stage rectification and low-temperature normal-pressure operation, efficient and low-cost production of the electronic grade IPA is achieved, the bottleneck of a traditional process is broken through, and the method is suitable for the ultra-precision manufacturing requirement of the semiconductor industry.

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 discloses a catalyst and a process for preparing anhydrous tert-butanol by isobutene hydration, belonging to the field of industrial catalysis. The preparation of the catalyst comprises the following steps: after polyethylene glycol-polyglycerol-polyethylene glycol triblock polymer, tetraethyl orthosilicate and deionized water are subjected to a first mixing reaction, sodium aluminate and sodium tungstate dihydrate are added for a second mixing reaction to obtain a mixture, and the mixture is successively subjected to calcination and HCl treatment to obtain a pretreated catalyst support. The pretreated catalyst support, a modified ionic liquid and N,N-dimethylformamide are subjected to a third mixing reaction to prepare the catalyst. In the catalyst prepared by the present invention, the lipophilic group adsorbs isobutene, and the hydrophilic group can interact with water molecules. The two effects cooperate with each other to form a microenvironment favorable for the reaction on the surface of the catalyst, thereby improving the conversion rate of isobutene and the selectivity of anhydrous tert-butanol.

The present invention provides a method for preparing isopropyl alcohol, comprising the steps of: cooling a reaction product and supplying the cooled reaction product to an absorption tower; and supplying a lower discharge stream of the absorption tower including isopropyl alcohol from the absorption tower to an isopropyl alcohol purification unit including first to fourth columns and supplying an upper discharge stream of the absorption tower including propylene to a gas purification unit including fifth and sixth columns, wherein all or a portion of the reaction product is cooled by exchanging heat with at least one of a lower discharge stream of the fourth column and a side discharge stream of the fifth column, an upper discharge stream of the second column exchanges heat with a lower discharge stream of the sixth column, and an upper discharge stream of the third column exchanges heat with at least one of a lower discharge stream of the first column and a lower discharge stream of the second column.

The present invention provides a method for purifying isopropyl alcohol, the method comprising the following steps: supplying a feed comprising isopropyl alcohol, water, a first light by-product, a second light by-product, and a heavy by-product to a first column so as to separate the first light by-product; and supplying a bottom discharge stream of the first column to a second column so as to separate into a second column top discharge stream comprising the second light by-product, a first side discharge stream of the second column, comprising a mixture of the isopropyl alcohol and water, a second side discharge stream of the second column, comprising the heavy by-product, and a second column bottom discharge stream comprising the water.

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 relates to a bifunctional catalyst comprising a carrier and an active component; the carrier is amorphous silica gel, and the active component is an all-silicon molecular sieve encapsulating a metal element; the metal element provides dehydrogenation active centers for the bifunctional catalyst, and the carrier and the all-silicon molecular sieve provide Lewis acid centers for the bifunctional catalyst. The present invention provides a bifunctional catalyst containing an all-silicon molecular sieve encapsulating copper and a preparation method thereof. The method comprises the following steps: mixing a silicon source I, a copper source, an additive, a dispersant, a nitrogen-containing heterocyclic compound, an alkali source, and H2O in a proportional manner, followed by hydrothermal treatment to obtain an all-silicon molecular sieve encapsulating copper oxide; and mixing a silicon source II, the prepared all-silicon molecular sieve encapsulating copper oxide, sesbania powder, a porogen, and H2O in a proportional manner, followed by molding to obtain the bifunctional catalyst containing the all-silicon molecular sieve encapsulating copper oxide. The present invention also provides a method for directly preparing ketones from olefins, using the above-mentioned bifunctional catalyst.

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)