10 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 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 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 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 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.