15 results about "Benzene synthesis" patented technology

The application provides a method for preparing isobutylbenzene from benzene and butene, which comprises four reactions in sequence; the first reaction is to synthesize sec-butylbenzene from benzene and butene; the second reaction is to generate 2-phenyl-2-butene by dehydrogenation of sec-butylbenzene; the third reaction is to generate 2-methyl-1-phenylpropene by isomerization of 2-phenyl-2-butene; and the fourth reaction is to generate isobutylbenzene by hydrogenation of 2-methyl-1-phenylpropene; the butene comprises 1-butene and / or 2-butene. The method uses benzene and butene as raw materials, adopts a four-step continuous series fixed-bed reaction process to synthesize isobutylbenzene, is simple to operate, can realize continuous production, does not need to use the metal potassium-sodium catalyst used in the traditional isobutylbenzene synthesis process, has small safety risk, and is suitable for industrialized production of isobutylbenzene.

This invention discloses a complete process for preparing nitrobenzene using a microchannel reactor, belonging to the field of nitrobenzene synthesis. The complete process includes mixed acid, microchannel nitration reaction, intermediate product cooling and stratification followed by water and alkali washing, crude product distillation, waste acid recovery, and wastewater treatment. Compared with existing nitrobenzene synthesis technologies, this invention has high mass transfer efficiency, significantly shortens the nitration reaction time, greatly improves production efficiency, enhances reaction safety, and simultaneously achieves waste acid recovery and wastewater treatment, ensuring safe, environmentally friendly, and stable production.

The invention relates to a synthesis method of 1, 4-bis (4-aminophenoxy) benzene, and relates to the technical field of organic synthesis. The preparation method comprises the following steps: adding parachloronitrobenzene, potassium carbonate and hydroquinone into N, N-dimethylformamide and toluene, and reacting by using a water separation device; after the reaction is finished, filtering, and leaching a filter cake with ethyl acetate; adding the filter cake into water, stirring, filtering, and leaching the filter cake with ethanol; adding the filter cake into a reaction kettle, adding ethanol, pulping, filtering and drying to obtain 1, 4-bis (4-nitrophenoxy) benzene; the preparation method comprises the following steps: adding 1, 4-bis (4-nitrophenoxy) benzene, a palladium carbon catalyst and tetrahydrofuran into a high-pressure kettle for reaction to obtain crude 1, 4-bis (4-aminophenoxy) benzene; the crude 1, 4-bis (4-aminophenoxy) benzene is subjected to filtration, rotary evaporation, methanol pulping treatment, filtration and drying, and 1, 4-bis (4-aminophenoxy) benzene is obtained; the process is simple, and the yield and the purity of the 1, 4-bis (4-aminophenoxy) benzene are relatively high.

The invention discloses a catalyst for synthesis of tert-butyltoluene as well as a preparation method and application of the catalyst. The catalyst comprises a single-layer-structure MWW molecular sieve, a binder, a rare earth metal oxide and an alkaline earth metal oxide. The catalyst has the characteristics of high active site utilization rate and adjustable pore structure, and shows high activity and high para-position product selectivity in the alkylation reaction of toluene and isobutene.

The invention discloses a method for detecting components of a 1, 4-bis (4-phenoxy benzoyl) benzene reaction solution by high performance liquid chromatography, which belongs to the technical field of analysis and detection methods, and the set chromatographic analysis conditions are as follows: separation by adopting a C18 chromatographic column subjected to end capping treatment, detection by adopting a diode array detector, and detection by adopting a chromatographic column subjected to end capping treatment. The contents of paraphthaloyl chloride, diphenyl ether, 1, 4-bis (4-phenoxybenzoyl) benzene (EKKE), EKKE ortho-isomer, 4-(4-phenoxybenzoyl) benzoic acid and 4-(4-phenoxybenzoyl) benzoate are simultaneously determined by using a single-point external standard method, and a determination method is provided for central control analysis and reaction endpoint judgment in a synthesis process of the 1, 4-bis (4-phenoxybenzoyl) benzene. The method is high in separation degree; the accuracy rate of a determination result is high, and the recovery rate of each substance is within the range of 95-105%; result repeatability RSD is less than 2%, and repeatability is good.

The present invention relates to a process for the synthesis of Pirfenidone (1) from 5-Methyl-3,4-dihydro-2-pyridone and halobenzene (chlorobenzene, bromobenzene, or iodobenzene) in the presence of a catalytic system consisting of a copper salt and an organic ligand, in the presence of a base.

The invention relates to a polyacid-based metal organic framework molecular material, the chemical formula of which is [Co2 (TPB) 1.5 (CoPW11O39) 4H2O] [Co (TPB) 0.55 H2O] 14H2O, which is called {PW11CoTPB} (TPB = 1, 2, 4, 5tetra (4pyridyl) benzene) for short. The synthesis method specifically comprises the following steps: uniformly mixing Co (NO3) 2.6 H2O, Na9 [APW9O34]. 7H2O and TPB in a mixed solvent of distilled water and methanol, then adjusting the pH value to 4-5, then transferring into a reaction kettle, reacting for 90-110 hours at the temperature of 110-130 DEG C, cooling to room temperature, separating out pink rhombic blocky crystals, washing and drying. The PW11CoTPB has relatively high thermal stability and chemical stability, a relatively wide light absorption range and a relatively low LUMO energy level, and active oxygen groups. O2 and. OH formed under light energy irradiation can be used for a Knoevenagel condensation reaction for green and efficient synthesis of alpha-beta-unsaturated carbonyl compounds.

The invention provides an intelligent optimization control method and system for an ethylbenzene synthesis device, which includes querying a plurality of alkylation reactors arranged in parallel; obtaining the upper and lower limits of raw materials that can be received by each alkylation reactor; filling the raw material portions into the alkylation reactor with the upper and lower limits of the raw materials as restrictions, forming a plurality of alkylation reactor combinations containing different raw material portions, and outputting them as initial combinations; obtaining ethylbenzene synthesis requirements, and converting the ethylbenzene synthesis requirements into optimization targets; using a gray wolf optimization algorithm to process the initial combinations based on the optimization targets, and obtaining an optimal combination; transporting the raw materials to the corresponding alkylation reactors according to the optimal combination for ethylbenzene synthesis; the raw material portions in the alkylation reactor in the optimal combination obtained by the gray wolf optimization algorithm are the optimal portions, and when ethylbenzene synthesis is performed based on the optimal portions, the requirements of the factory for output speed, production output or environmental impact can be met to the maximum extent.

The application discloses a fluorobenzene synthesis tail gas nitrogen oxide resource recycling system, which comprises a synthesis reaction kettle, wherein the upper opening of the synthesis reaction kettle is sequentially connected with a kettle cover, a deep cooling heat exchanger, a deep cooling tail gas heat exchanger and an activated carbon adsorption tower, and the activated carbon adsorption tower is connected with an exhaust tail gas pipeline through an air draught fan / return cooling fan. The system is simple, clean, environmentally friendly, stable, efficient and high in nitrogen oxide recycling efficiency.

The invention relates to the technical field of preparation of 1, 3-bis (tert-butyldiisopropyl peroxide) benzene, and provides a synthesis method of high-purity 1, 3-bis (tert-butyldiisopropyl peroxide) benzene, which comprises the following synthesis steps: adding an MF I type zeolite molecular sieve into a reaction kettle, and then introducing supercritical CO2 to obtain a catalyst solution; uniformly mixing the purified AATD with a tert-butyl hydroperoxide solution, then putting the mixture into a catalyst solution, stirring and reacting, stopping stirring after the color of the reaction is changed, standing until no precipitate is generated, draining supernatant liquid into a collecting device, and cooling and depressurizing to release CO2; repeating the step 3-5 times; and taking out the product in the collecting device, washing with hot water, and distilling to remove moisture, thereby finally obtaining the 1, 3-bis (tert-butyldiisopropyl peroxide) benzene. According to the technical scheme, the problems of low purity, low yield and poor environmental protection property of the 1, 3-bis (tert-butyldiisopropyl peroxide) benzene in the prior art are solved.

The invention provides a method for synthesizing 2, 4-dichlorobenzaldehyde by using 4-chloro-2-nitrotoluene, which comprises the following steps: by using a byproduct 2-nitro-4-chlorotoluene as a raw material, reacting 4-chloro-2-nitrotoluene with chlorine under the action of ultraviolet light and a catalyst to obtain 2, 4-dichlorobenzyl chloride, 4-chloro-2-nitrobenzyl chloride, 4-chloro-2-nitrobenzyl chloride, 2, 4-dichlorobenzyl chloride and 2, 4-dichlorobenzyl chloride; the method comprises the following steps: adding a mixture I of 2, 4-dichlorotrichlorobenzyl into a reaction kettle, carrying out reduced pressure rectification, and carrying out hydrolytic hydroformylation, elutriation alkali washing and distillation on 2, 4-dichlorobenzyl chloride obtained by rectification to obtain a 2, 4-dichlorobenzaldehyde finished product. The process route provided by the invention has the advantages of low raw material cost, simple process, low post-treatment energy consumption and the like, solves the problem of recycling of the by-product 2-nitro-4-chlorotoluene, and meets the development requirements of green fine chemical engineering.

The present invention discloses a magnetic fluorine and nitrogen co-doped organic polymer adsorption material, its preparation method, and application. The magnetic fluorine and nitrogen co-doped organic polymer adsorption material is prepared by a one-step synthesis method. The Fe3O4@SiO2-NH2 nanoparticles are used as carriers, and the nanoparticles are coated with POPs synthesized from the comonomers 1,4-bis(2,4-diamino-1,3,5-triazine)-benzene and fluoroformaldehyde benzene. The material prepared by the present invention has a high nitrogen content and can bind H under neutral and acidic conditions. + This makes its surface carry a positive charge, which can interact electrostatically with anions and effectively improve its adsorption effect; at the same time, fluorine atoms can increase the hydrogen bonding and electrostatic interactions between host and guest molecules (can produce hydrogen bonding effects with amphetamine-type stimulants), promote high selectivity of adsorption, and thus achieve high-precision quantitative detection of trace or trace amounts of amphetamine-type stimulants in samples.

The invention provides a catalyst for synthesizing cyclohexylbenzene based on surface modification and a preparation method and application thereof, the catalyst for synthesizing cyclohexylbenzene comprises a carrier, and a first active component and a second active component which are loaded on the surface of the carrier, and the second active component partially covers the surface of the first active component; wherein the carrier comprises a molecular sieve; the first active component comprises Pt and / or Pd, and the second active component comprises Ni and / or Ru. The carrier is subjected to surface modification by adopting a specific type of metal, so that the performance of the catalyst is effectively regulated and controlled, the selectivity of a by-product cyclohexane is reduced, the yield of a target product cyclohexylbenzene is improved, and large-scale popularization and application are facilitated.

The invention discloses a catalyst for synthesis of 2, 6-dichlorotoluene and a preparation method of the catalyst, and belongs to the technical field of production of 2, 6-dichlorotoluene. According to the catalyst, ZSM-5 zeolite is used as a matrix, firstly, mesoporous-microporous graded pore channels are constructed in the ZSM-5 zeolite through selective etching of an alkali solution to improve mass transfer; then loading iron and cerium bimetallic active components by adopting an equivalent-volume impregnation method, and accurately regulating and controlling a reaction path through the synergistic effect of acidity and oxidation-reduction characteristics of the iron and cerium bimetallic active components; and finally, coating the outer surfaces of the catalyst particles with a layer of amorphous silicon dioxide thin shell through a chemical vapor deposition technology, and selectively passivating non-shape-selective acidic sites on the outer surfaces. According to the design, the chlorination reaction is forced to be mainly carried out in an internal pore channel with shape selectivity, so that the selectivity and yield of 2, 6-dichlorotoluene as well as the recyclability are remarkably improved while the high activity is maintained.

The invention provides a novel method for synthesizing 1,4-di(4-fluorobenzoyl)benzene, which belongs to the technical field of aromatic halogenated product production. The method comprises the following steps: adding a supported solid acid and fluorobenzene into a reaction container under an inert gas; dropping terephthaloyl chloride into the reaction container, and reacting at 5-30 DEG C for 1-8 hours to obtain 1,4-di(4-fluorobenzoyl)benzene; purifying the reaction system to obtain 1,4-di(4-fluorobenzoyl)benzene with a purity of more than 97.2%; the supported solid acid consists of a carrier and a Lewis acid; the Lewis acid is selected from any one of aluminum chloride, ferric chloride, titanium tetrachloride and zinc chloride; and the carrier is selected from any one of HY molecular sieve, Hβ molecular sieve, ZSM-5 molecular sieve, acid-treated K10 montmorillonite, aluminum oxide and MCM-41 molecular sieve. The reaction system of the present invention has mild conditions, and the product purity is ≥97.2%. After optimizing the conditions, the purity is greater than 99.5%. The product and the catalyst can be separated by filtration, thus avoiding the generation of waste salts. The catalyst can be recycled, and the reaction is green and environmentally friendly.