25 results about "Ethylbenzene" patented technology

This invention discloses a catalyst for the alkylation of tert-butanol with styrene to prepare tert-butylethylbenzene and ethylbenzene, its preparation method, and its application. The catalyst consists of a support and active components loaded on the support. The active components are oxides of rare earth metals and high-valence oxides of transition metals. The support is H-β zeolite. The mass contents of the oxides of rare earth metals and high-valence oxides of transition metals on the support are 3-5% and 2-4%, respectively. This invention makes a breakthrough in the reaction mechanism by loading rare earth metals and transition metals onto a β-molecular sieve and using tert-butanol and styrene as raw materials for alkylation. This avoids the polymerization of styrene (raw material) and the dimerization of isobutylene (intermediate product), reduces the generation of by-products, and makes the catalytic process controllable.

A method for preparing ethylbenzene by using nanosheet molecular sieve as catalyst, the hydrogen type nanosheet molecular sieve is broken and loaded into a fixed bed reactor, benzene and ethanol are used as raw materials, nitrogen is used as carrier gas, the reaction is carried out at 280-350 DEG C and 0.1-1.0 MPa; the hydrogen type nanosheet molecular sieve is ZSM-5 molecular sieve, the length of b axis direction is 70-100 nm, the length ratio L b / L a is less than 0.40. The method for preparing ethylbenzene provided by the application can be directly used for catalyzing ethanol and benzene to prepare ethylbenzene without secondary treatment such as modification of acid, alkali and alkali metal and rare earth metal elements based on the special structure of the nanosheet molecular sieve with ultra-short b axis, can ensure that the product is desorbed and diffused from the surface of the catalyst in time, reduces the probability of deep reaction of the product molecules, realizes high selectivity of the product ethylbenzene, and reduces the cracking and other side reactions.

The application discloses an ethylbenzene dehydrogenation catalyst and a preparation method and application thereof. The catalyst comprises an active component of a composite metal oxide and a carrier of an epihalloysite. Preferably, the carrier content is 52% to 90% and the active component content is 10% to 48% based on the weight of the catalyst. The catalyst has the characteristics of uniform dispersion of the active component, good thermal stability and simple preparation process, and is suitable for large-scale industrial production. The catalyst has high catalytic activity, selectivity and good stability when applied to ethylbenzene dehydrogenation reaction.

The application relates to an iminodiacetic acid type chelating resin and a preparation method and application thereof, and the preparation method comprises the following steps: (1) in the case that the stirring speed is 200-350 r / min, two dispersants are dissolved in water, then ethylbenzene, glycidyl methacrylate, trimethylolpropane trimethacrylate, isooctane and di-t-butyl peroxide are added, the raw materials are reacted after ultrasonic mixing, centrifugal separation is carried out after the reaction is completed, the filter cake is cleaned and dried, and resin microspheres are obtained; (2) in the stirring state, the resin microspheres obtained in the step (1) are added into water, then iminodiacetic acid is added, stirring is continued, then preliminary reaction is carried out by heating, NaOH is further added, reaction is carried out by heating, after the reaction is completed, filtration, cleaning and drying are carried out, and the iminodiacetic acid type chelating resin is obtained. The chelating resin particle size can be controlled, the particle size is relatively large, the specific surface area is large, the adsorption capacity is high, and the chelating resin can be used for adsorbing lead ions in heavy salt matrix.

This invention belongs to the field of pharmaceutical synthesis, specifically relating to a method for preparing etorizine hydrochloride and its intermediates. Specifically, it involves reacting propionyl chloride and ethylbenzene at -80 to -50°C to obtain p-ethylphenylacetone, which is then reacted with piperidine and paraformaldehyde to form a salt, yielding etorizine hydrochloride. The method for preparing p-ethylphenylacetone provided by this invention can obtain a product with a low content of compound II. Using this as a raw material to prepare etorizine hydrochloride simplifies post-processing, improves yield, and ensures that the content of compound III meets pharmacopoeia standards, making it suitable for industrial production.

This invention discloses a catalyst for the dehydrogenation of ethylbenzene to styrene, its preparation method, and its application. The catalyst comprises Fe₂O₃, K₂O, CeO₂, MoO₃, TiO₂, MnO₂, and Co₃O₄; wherein the exposed crystal facet area of ​​TiO₂(001) accounts for more than 60% of the total exposed crystal facet area of ​​TiO₂. This catalyst, when used in the dehydrogenation of ethylbenzene to styrene reaction, exhibits high catalytic activity and good selectivity.

The present invention provides a polysiloxane composition capable of forming a coating film having a low refractive index, and excellent in storage stability and coating properties on a substrate. The composition comprises 10 to 90 parts by mass of a branched polysiloxane represented by the average unit formula: [R 1 (CH3)2SiO 1 / 2 ] a [R 1 (CH3)SiO 2 / 2 ] b [R 1 SiO 3 / 2 ] c [SiO 4 / 2 ] d [R 2 O 1 / 2 ] e and 90 to 10 parts by mass of an organic solvent other than benzene, toluene, ethylbenzene, xylene, at a refractive index of less than 1.45 at a wavelength of 633 nm. Note that in the above formula, R 1 is a hydrogen atom, a C1-6 monovalent aliphatic hydrocarbon group, or a C6-12 monovalent aromatic hydrocarbon group, R 2 is a hydrogen atom or a C1-4 monovalent hydrocarbon group, and a, b, c, d, and e satisfy the following conditions: 0

The present application relates to the technical field of dehydrogenation catalyst, in particular to a K-Fe-based ethylbenzene dehydrogenation catalyst modified by ternary additives, a preparation method and application thereof; the ethylbenzene dehydrogenation catalyst is obtained by sequentially spraying the first cerium complex spray solution, the second cerium complex spray solution and the oxalic acid aqueous solution on the surface of the pre-constructed master batch, and then drying and calcining; the catalyst can be used for ethylbenzene dehydrogenation reaction, and is especially suitable for ethylbenzene dehydrogenation to styrene reaction under low steam ratio conditions, and shows high ethylbenzene conversion rate, high styrene selectivity and good stability.

This invention provides a method for purifying β-phenylethanol. The feed stream 1 is the bottom liquid from the styrene separation reaction of α-phenylethanol in the ethylene-phenyl co-oxidation process for producing propylene oxide. The method includes: receiving a solution stream 2 of thiourea compounds at the upper part of an extraction tower; receiving an extractant stream 3 in the middle part of the extraction tower; receiving the feed stream 1 at the lower part of the extraction tower; obtaining an oil phase stream 4 after impurity removal and extraction in the extraction tower; collecting waste liquid at the bottom of the extraction tower; passing the oil phase stream 4 into a crystallizer for crystallization and purification to obtain a product stream 5; the solution stream 2 of thiourea compounds is a thiourea compound, which can effectively remove aldehydes and ketones. This invention can obtain a high-purity β-phenylethanol product with acceptable aroma.

This invention relates to the field of mesitylene production technology, specifically a method for producing mesitylene from C9 aromatics. The method involves reacting C9 aromatics with hydrogen via a hydrodealkylation reaction. The dealkylation products are then separated; the gaseous product is returned to a reverse dealkylation reactor, while the liquid product is separated. The bottom product from the BTX tower is then fed into a mesitylene tower for further separation. The bottom product from the mesitylene tower is then fed into a mixing tower for further separation. The top product from the mixing tower undergoes an isomerization reaction, and the isomerization products are then separated to obtain mesitylene. This invention features a simple process flow, using C9 aromatics as raw material. The combined production process of dealkylation and tricresyl isomerization minimizes side reactions, reduces hydrogen consumption, and allows for further utilization of byproducts. The resulting product contains less than 0.5% methyl ethyl phenyl (MEP), eliminating MEP interference with tricresyl separation, improving the yield and purity of mesitylene, reducing production costs, and enhancing the utilization value of C9 aromatics resources.

The application discloses a method for preparing acetophenone by catalyzing ethylbenzene oxidation. The method uses ethylbenzene as a raw material, air as an oxidant, and a porphyrin-like metal complex as a catalyst, controls a reaction temperature to be 30-100 DEG C, controls a reaction pressure to be 0.5-3.0 MPa, and performs a catalytic reaction, so that acetophenone can be obtained with high selectivity. The method has the advantages of simple process, mild reaction condition and high selectivity.

The application relates to the field of catalysts and discloses a recycling method of high-temperature powder of an ethylbenzene dehydrogenation catalyst, wherein the method comprises the following steps: (1) dry mixing and stirring the high-temperature powder; (2) mixing the material obtained in the step (1) with water to carry out wet kneading, adding a binder to carry out molding and drying treatment, and obtaining a catalyst semi-product; (3) calcining the catalyst semi-product to obtain a catalyst product; wherein the high-temperature powder is in the form of fine powder, the particle size is 2.5-3.5 mm, the water content of the high-temperature powder is 0.5wt%-3wt%, and the high-temperature powder is the powder obtained after 800-1000 DEG C calcination of ethylbenzene dehydrogenation catalyst waste for 10-12h. The method solves the problems that the humidity of the raw material is difficult to control and the mechanical performance of the catalyst prepared through recycling is poor, and greatly improves the mechanical performance of the catalyst.

This application discloses a multi-layered metal oxide and its application in the hydroconversion of polystyrene waste plastic pyrolysis oil. The prepared multi-layered metal oxide is used as a catalyst and, after pretreatment, is thoroughly mixed with polystyrene waste plastic pyrolysis oil. The mixture is then transferred to a reaction vessel, sealed, and hydrogen is introduced into the vessel. The reaction temperature is controlled at 90-100°C, and the reaction is stirred for 6-12 hours. This application utilizes multi-layered Ni... x By combining Al-LDO with hydrogenation processes, the structural advantages of multilayer catalysts and the combined effect of hydrogenation reactions can be used to improve styrene conversion and ethylbenzene selectivity.

The application relates to the technical field of catalyst preparation, and discloses an ethylbenzene dehydrogenation catalyst, a preparation method thereof and an ethylbenzene dehydrogenation method.The ethylbenzene dehydrogenation catalyst comprises Fe, K, Ce, Mo and Ca elements, and Rb and / or Cs elements; wherein the catalyst satisfies (Mo) XPS / (Mo) ICP = 1.5-6, wherein (Mo) XPS is the mass content of Mo elements in the catalyst characterized by X-ray photoelectron spectroscopy, and (Mo) ICP is the mass content of Mo elements in the catalyst characterized by inductively coupled plasma emission spectroscopy.The ethylbenzene dehydrogenation catalyst has high catalytic activity and styrene selectivity in the ethylbenzene dehydrogenation method.

This invention relates to the field of producing mesitylene from reformed C9 heavy aromatics, specifically a method, apparatus, catalyst, and preparation method for producing mesitylene. The method for producing mesitylene includes removing C9 heavy aromatics from C9 heavy aromatics via a de-heavy tower. 10 The above-mentioned heavy components convert the separated C9 mixed aromatics into dealkylation isomerization products. These products undergo gas-liquid separation to obtain liquid hydrocarbon products, which are then separated in a distillation column. Light components are produced at the top of the distillation column, mesitylene is produced from the side stream, and the bottom product is returned to the heavy hydrocarbon removal column, achieving material recycling. This invention uses reformed C9 heavy aromatics as raw material, developing a highly efficient catalyst and reaction separation process to solve the interference of methyl ethyl benzene in existing processes, retain mesitylene, reduce by-product generation, increase mesitylene yield, improve catalyst stability, extend operating cycle, reduce mesitylene production costs, and enhance the utilization value of C9 mixed aromatics.

This invention provides a composition capable of forming a coating film with a low refractive index and exhibiting excellent storage stability and coatability. The composition contains 10-90 parts by mass of a branched polysiloxane of formula (1) with a refractive index less than 1.45 at a wavelength of 633 nm, and 90-10 parts by mass of an organic solvent other than benzene, toluene, ethylbenzene, and xylene. A a R b (OZ) c SiO (4‑a‑b‑c) / 2 (1) R A R is a monovalent aliphatic saturated hydrocarbon group with 3 to 12 carbon atoms, R is a hydrogen atom, methyl, ethyl, a monovalent aliphatic unsaturated hydrocarbon group with 2 to 12 carbon atoms, or a monovalent aromatic hydrocarbon group with 6 to 12 carbon atoms, and Z is a hydrogen atom or a monovalent aliphatic saturated hydrocarbon group with 1 to 4 carbon atoms. Furthermore, a, b, and c satisfy 0.2 ≤ a < 1; 0

Provided is a curable resin capable of giving a cured object having satisfactory heat resistance. The curable resin is obtained by subjecting a product of reaction between a haloethylbenzene represented by formula (2A) and a vinylbenzyl halide represented by formula (3A) to a dehydrohalogenation reaction.

The application relates to the technical field of catalysts, and provides an ethylbenzene dehydrogenation catalyst as well as a preparation method and application thereof. The catalyst is prepared from raw materials including catalyst waste, red mud, an activator, a binder and a pore-forming agent; the catalyst waste is waste generated in the production process of an Fe-K-Ce-Mo catalyst. The catalyst provided by the application reuses the two industrial wastes of red mud and catalyst waste, achieves economic effects, and achieves good environmental protection effects; the catalytic performance of the catalyst is basically equivalent to that of a conventional Fe-K-Ce-Mo catalyst, and the strength is better.

This invention discloses a method for recovering and refining waste liquid from a propylene oxide (PO) process, belonging to the field of chemical technology. The method includes: dehydrating and heating the PO process waste liquid, then sending it to a waste liquid coarse separation tower for distillation to obtain a mixture of light components and a mixture of heavy components; completely condensing and separating the light component mixture; the resulting oil phase component entering an ethylbenzene refining tower for distillation to obtain ethylbenzene product and a propylene oxide-acetone mixture; the heavy component mixture entering a waste liquid de-heavy treatment tower to obtain a high-boiling-point mixture and an AMS-cumene-phenol mixture; the AMS-cumene-phenol mixture entering a cumene product tower for refining to obtain cumene product gas and an AMS-phenol mixture; and the AMS-phenol mixture entering an AMS product tower for refining to obtain an AMS product and an AMS-phenol mixed gas. This invention reduces emissions of waste gas, wastewater, and solid waste, and the return of cumene as a raw material to the system reduces material consumption and significantly improves the economic efficiency of the plant.

This invention discloses a pretreatment process for dry gas from ethylbenzene production. The steps are as follows: the dry gas from ethylbenzene production sequentially enters a dry gas separator and coalescer, a dry gas water washing tower, a water-washed dry gas cooler, and a water-washed dry gas separator to remove organic amines and / or ammonia carried in the dry gas. The dry gas water washing tower is arranged from bottom to top as a first water washing section, a second water washing section, a third water washing section, ..., N water washing sections, where N≥2. A collection tank is set between two adjacent water washing sections. The bottom plate of the collection tank is equipped with a riser hole and a riser pipe to connect the two adjacent water washing sections. Each water washing section is arranged from bottom to top as a structured packing section and a water washing water distributor. The dry gas water washing adopts a multi-stage water washing process. Each stage of water washing uses a water washing circulation pump to circulate the water washing water. A water washing water filter is installed on the water washing water circulation pipeline of each stage. The water washing water adopts a method of partial circulation, continuous discharge, and continuous water replenishment. Using this invention, the amount of alkaline substances carried in the dry gas of ethylbenzene production feedstock can be effectively removed.

This invention proposes a matte, low-odor bulk ABS resin and its preparation method. Low-cis polybutadiene rubber, ethylbenzene, styrene, and acrylonitrile are mixed and dissolved to form a raw rubber solution. After filtration and preheating, the raw rubber solution and additives are fed into four plug flow reactors connected in series for continuous bulk polymerization. The polymerized material is then extruded for devolatilization and granulation to obtain the matte, low-odor bulk ABS resin. This invention reduces organic gases in the finished product by modifying the process conditions of conventional matte ABS products and adding a reflux device with an adsorption tank to the fourth reactor of the ABS polymerization unit. Simultaneously, it increases the high-temperature reaction time of some materials to reduce unreacted monomers.

This invention relates to an anti-corrosion coating, a method for coating gas channels, and a semiconductor device. The anti-corrosion coating is used to coat the gas channels of a semiconductor etching cavity. The anti-corrosion coating comprises: a polytetrafluoroethylene (PTFE) emulsion and a diluent. The PTFE emulsion comprises: 40%–60% PTFE, 2%–8% carbon black, 20%–30% N-methyl-2-pyrrolidone, 10%–15% methyl isobutyl ketone, 1%–5% 1,2,4-trimethylbenzene, 1%–5% ethylbenzene, and 1%–5% light aromatic hydrocarbon solvent naphtha. If the PTFE emulsion is used at a constant mass percentage, and the pore size of the gas channel is less than or equal to 5 mm, the mass percentage of the diluent has a first linear relationship with the pore size of the gas channel; if the pore size of the gas channel is greater than 5 mm, the mass percentage of the diluent has a second linear relationship with the pore size of the gas channel. The anti-corrosion coating formed by this invention can prevent etching gases from causing corrosion damage to the gas channel surface.

This invention relates to the field of dehydrogenation catalysis in chemical catalysis, and discloses an ethylbenzene dehydrogenation catalyst, its preparation method and application, as well as a method for ethylbenzene dehydrogenation. The ethylbenzene dehydrogenation catalyst comprises: 85wt%-95wt% of a composite metal oxide and 5wt%-15wt% of carbon-doped modified boron nitride; based on the total mass of the catalyst, the composite metal oxide contains 55wt%-76wt% Fe₂O₃, 4.8wt%-10.2wt% K₂O, 4.6wt%-11.4wt% CeO₂, 1.2wt%-4.5wt% MoO₃, 0.5wt%-3wt% MnO₂, 0.5wt%-2.8wt% NiO, and 0.3wt%-2.6wt% Co₃O₄. The catalyst of this invention, when applied to the ethylbenzene dehydrogenation reaction, exhibits high catalytic activity, high selectivity, and high stability.

A process comprising: (a) providing a feedstock containing a carbonaceous material; (b) thermally converting the feedstock to produce a gas stream containing carbon monoxide, hydrogen, and carbon dioxide; (c) converting at least a portion of the carbon monoxide, hydrogen, and carbon dioxide into ethanol; (d) converting at least a portion of the ethanol into ethylene; (e) reacting at least a portion of the ethylene with benzene to produce ethylbenzene; and (f) dehydrogenating the ethylbenzene to form styrene.