237results about "Preparation by hydroxy group addition" patented technology

The invention relates to the technical field of low-carbon olefin hydration, and discloses a modified hydrated filler as well as a preparation method and application thereof. The modified hydrated filler comprises a filler matrix, and a silane layer, a modified layer A and a modified layer B which are sequentially coated on the outer surface of the filler matrix from inside to outside, the modified layer A contains a pyrrolyl group, an amido group and a furyl group; the modified layer B contains phenoxy, pyrrolyl, furyl, sulfonic acid group, phosphate group and acylamino. The modified hydrated filler provided by the invention can obviously improve the mixing effect of water and alkene and promote the improvement of the yield of low-carbon alcohol.

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 relates to the field of olefin hydration, and discloses a low-carbon olefin hydrated fiber membrane as well as a preparation method and application thereof. The low-carbon olefin hydrated fiber membrane comprises a hollow fiber membrane substrate, and a first silane layer, a first functional layer and a first alkene-philic layer which are sequentially coated on the inner surface of the hollow fiber membrane substrate from inside to outside, the outer surface of the hollow fiber membrane substrate is sequentially coated with the second silane layer and the second functional layer from inside to outside; the first functional layer contains an amide group, a phenoxy group, a sulfonic group, a phosphate group, a pyrrolyl group and a furyl group; the first enophilic layer contains phenoxy groups; and the second functional layer contains an amide group, a pyrrolyl group and a furyl group. According to the low-carbon olefin hydrated fiber membrane, the contact effect of water and olefin can be improved, movement of hydration equilibrium is promoted, and the superposition loss of olefin is reduced.

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 relates to the technical field of low-carbon olefin hydration, and discloses a low-carbon olefin hydration catalyst and a preparation method thereof, and a method for producing a low-carbon alcohol aqueous solution. The low-carbon olefin hydration catalyst comprises a resin white ball matrix, an adsorption layer and a reaction layer, the adsorption layer is grafted on the outer surface of the resin white ball matrix, and the reaction layer is grafted on the inner surface of the resin white ball matrix; the adsorption layer contains a phenoxy group, an amido group, a pyrrolyl group and a furyl group; the reaction layer contains phenoxy, amido, sulfonic acid group, phosphate group, pyrrolyl and furyl. The low-carbon olefin hydration catalyst can improve the contact effect of water and olefin, promote the movement of hydration equilibrium and reduce the superposition loss of olefin.

The invention discloses a preparation method of tert-butyl alcohol, and relates to the technical field of chemical raw materials. The method comprises the following steps: pretreatment of a catalyst: activating the solid acid catalyst to remove possible impurities and moisture so as to improve the activity and selectivity of the catalyst; hydration reaction: adding the pretreated catalyst into a reaction tower, introducing isobutene gas and water, stirring, and carrying out hydration reaction under the action of the catalyst; and separation and purification: the reacted mixture enters a separator, tert-butyl alcohol and the raw material are separated out, the unreacted raw material isobutene is circulated back to the reaction kettle to continue to participate in the reaction, the separated crude tert-butyl alcohol product enters a rectifying tower to be rectified and purified, and the tert-butyl alcohol product is obtained. Compared with a traditional liquid acid catalyst, the solid acid catalyst has the advantages of being easy to separate, capable of being repeatedly used, small in corrosion to equipment and the like.

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 provides a method and a device for preparing tert-butyl alcohol by hydrating isobutene in raffinate C4, the raffinate C4 and water are used as raw materials and flow in a hydration reactor in a countercurrent manner, the isobutene in the raffinate C4 and the water react under the action of a catalyst to generate tert-butyl alcohol, the water and the tert-butyl alcohol are extracted from the bottom of the hydration reactor, and the tert-butyl alcohol is obtained. Liquid-phase residual C4 after reaction leaves the reactor from the upper part of the hydration reactor, and gas-phase C4 extracted from the top of the hydration reactor is condensed and gasified or compressed and then returns to the bottom of the reactor to serve as disturbance gas, so that the liquid-liquid-solid three-phase contact area is increased, the reaction rate is increased, and the reaction time is shortened; meanwhile, the generated tert-butyl alcohol product is timely removed from the reaction zone, so that the reaction is carried out in the positive direction, the conversion rate of isobutene is improved, and the method has higher economical efficiency by adopting a lower water-oil ratio and lower operation pressure.

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 discloses a method for preparing adipic acid through electro-catalysis of cyclohexene. The method comprises the following steps: (I) carrying out electro-catalysis reduction on oxygen at a cathode to generate hydrogen peroxide; (2) reacting hydrogen peroxide with cyclohexene to obtain cyclohexanediol; (3) carrying out electrocatalytic oxidation reaction on cyclohexanediol at an anode to obtain adipate; and (IV) acidifying, washing and drying the adipate to obtain an adipic acid solid, and the like. According to the invention, the electrochemical reaction is driven by the electric power generated by renewable energy sources, so that the cascade reaction from cyclohexene to adipic acid is realized; the preparation method is mild in condition, green and environment-friendly and high in product selectivity, cathode oxygen reduction and anode cyclohexanediol oxidation are carried out by utilizing electric power generated by renewable energy sources, hydrogen peroxide generated by a cathode reacts with cyclohexene in a flowing system to generate cyclohexanediol, reaction liquid can be directly injected into an anode for reaction, and the yield is high. In the reaction process, only oxygen, dilute alkali solution and dilute acid solution are input except for cyclohexene, so that the use of strong acid and strong oxidant is avoided.

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 provides a green and efficient caryophyllene hydration method and device, and the process comprises the following steps: mixing a solid acid catalyst with a turpentine heavy fraction to obtain a mixed solution; adding water in a mass ratio of 100: (10-15) to the turpentine heavy fraction into the mixed solution, and after the reaction is finished, and / or filtering out the catalyst to obtain a filtrate; and carrying out reduced pressure rectification and recrystallization on the filtrate. The preparation method is simple, the raw material conversion rate can reach 90%-99%, reaction conditions are mild, product selectivity is high, side reactions are few, and production operation is easy; meanwhile, the reaction efficiency is high, the catalyst can be recycled after being filtered, and the concept of green chemistry is better met.

A method of producing a fuel additive includes passing a feed stream comprising C4 hydrocarbons through a first hydrogenation unit producing a first process stream; passing the first process stream through a distillation unit; withdrawing a 2-butene stream from the distillation unit: passing the 2-butene stream through a second hydrogenation unit producing a 1-butene stream; passing at least a portion of the 1-butene stream through a separation unit; and passing the 1-butene stream through a hydration unit producing the fuel additive.

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 belongs to the field of application of cyclohexene hydration catalysts, and particularly relates to a method for improving cyclohexene hydration reaction efficiency. The method comprises the following steps: (1) weighing a catalyst, desalted water and a cosolvent, mixing, and uniformly stirring to obtain a mixed solution; (2) slowly pouring cyclohexene into the mixed solution, sealing, replacing with nitrogen, and reacting after the nitrogen is completely replaced; and after the reaction is finished, naturally cooling to room temperature, extracting by using a dichloromethane solution, and centrifuging. The method for improving the hydration reaction efficiency of cyclohexene provided by the invention can improve the conversion rate of cyclohexene and the yield of cyclohexanol, considers the feasibility of application on a device, and greatly reduces the dosage of a cosolvent, meets the actual operation condition of the device and improves the economic benefit under the condition of equal reaction efficiency compared with the prior art. The method can be widely applied to industrial production.

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 present invention provides a method of preparing isopropyl alcohol (IPA), and the method may comprise the steps of: (S1) preparing an isopropyl alcohol (IPA) crude product obtained by performing gas purification and isopropyl alcohol purification on a reaction product of propylene and water; (S2) supplying the IPA crude product to a first region of a divided wall distillation column including the first region, a second region, a column top region, and a column bottom region; and (S3) in the divided wall distillation column, separating water and a low boiling point organic material included in the IPA crude product by means of the column top region, separating a high boiling point organic material and an inorganic material included in the IPA crude product by means of the column bottom region, and obtaining purified isopropyl alcohol in a liquid or gas phase by means of the second region.

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.

The invention discloses a method for improving the yield of hydration reaction of myrcene or dihydromyrcene and a synthetic fragrance, belonging to the technical field of deep processing of forest chemical products. The method comprises steps of synthesis reaction, catalyst recovery, solvent recovery, product neutralization, product fractionation, etc. The invention adopts a composite catalyst composed of one or more of zirconium sulfate, titanium sulfate, α-hydroxy acid and divalent copper salt to catalyze the hydration reaction of myrcene or dihydromyrcene, thereby improving the yield of hydration products and reducing side reactions and energy consumption.

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.