4 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 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 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.