59 results about "Diethyl benzene" patented technology

The propylene absorbing process is to eliminate propylene from catalytically cracked dry gas from oil refinery without any purifying and refining in a propylene selectively absorber. The dry gas and the absorbent are contacted through convection. The absorbent may be benzene, ethyl benzene, diethyl benzene, triethyl benzene, polyethyl benzene, diesel oil, gasoline, etc. or their mixture. The absorption conditions include operation temperature of -10 deg.c to +40 deg.c, pressure of 0.1-3.5 MPa, and the absorbent/dry gas volume ratio of 3-25 ml/L. The desorption conditions for the absorbed absorbent include temperature of 20-300 deg.c, pressure of 0.1-3.5 MPa, the sweeping gas/ absorbent volume ratio of 1-15, and the sweeping time of 1-10 hr. The sweeping gas may be N2, H2, methane, ethane, etc. or their mixture. The desorbed absorbent may be reused.

The invention provides a kind of nano HZSM-5 zeolite metal ion compound modified catalyst and the manufacturing method, which uses ethylbenzene and ethyolene as materials to produce diethylbenzene through alkylation. The catalyst uses nano HZSM-5 molecular sift and carrier Al2O3 as parent, carries 1-2 kinds of lanthanum, silicon, phosphorus and magnesium and so on active component, the modified catalyst can be produced through immersing, drying, baking. The invention has a large specific area, the channel is short, and the catalyst has high reaction activity and stability, and high para-selectivity.

The present invention relates to a process for the selective production of para-diethyl benzene from a mixed aromatic feedstock containing ethyl benzene and at least one other aromatic compound selected from benzene, alkylated benzene having alkyl group with carbon number 1 to 6, mono-alkyl aromatics, dialkyl aromatics, trialkyl aromatics, tetraalkyl aromatics, pentaalkyl aromatics, hexaalkyl aromatics, containing side chains having 1 to 6 carbon atoms, and any mixtures thereof the process comprising of (a) alkylating the feedstock under alkylating conditions, over a selectivated metallosilicate composite catalyst; and (b) recovering a product stream containing at least 95 wt % paradiethyl benzene, the product stream being substantially free from other isomers of diethylbenzene, Ca aromatics, C₉ aromatics, C₁₀+ heavy aromatics other than diethyl beizene isomers, sulphur, halogen, olefinc compound and carbonyl compounds.

The invention relates to a method for preparing catalyst for compounding p-diethylbenzene by the alkylation reaction of ethylbenzene and ethane or alcohol, and the obtained catalyst can be used for compounding p-diethylbenzene by the alkylation reaction of ethylbenzene and ethane or compounding p-diethylbenzene by the alkylation reaction of the ethylbenzene and alcohol. The catalyst is formed in such a way that an HZSM-5 molecular sieve of SiO2/Al2O3 molar ratio=16-200 as a matrix to be loaded with silicon dioxide and then roasted and passivated by air and water vapor. The preparation of the catalyst only needs three-step operation; and compared with the prior method for preparing the similar catalyst, the invention greatly simplifies the preparation process. The method does not need to add other substances to further modify the HZSM-5 molecular sieve, thereby having low raw material cost and production energy consumption as well as less environmental pollution and obtaining favorable p-diethylbenzene selectivity and yield.

The invention relates to a method for preparing a shape-selective alkylation catalyst, in particular to a method for preparing high-selectivity synthetic p-diethylbenzene catalyst by use of rare earth modification. The method has a main technical characteristic that rare earth modification is completed in two mutually linked steps, namely hot impregnation and cold impregnation. The high-selectivity catalyst prepared by the method has the advantages of high activity, long single-pass reaction period and good regeneration repeatability.

A method for regeneration of toxic adsorbent is disclosed. The adsorbent comprises 80% to 95% by weight of molecular sieve and the other is adhesive agent. Regeneration process includes: solving and cleaning the adsorbent bed by using mixed aromatic solvent with 5% to 30% by volume of polar compound at 20 to 180 degree s C. under 0.2-1.5MPa and drying. Aromatic hydrocarbon in said mixed aromatic solvent is selected from toluene, xylene, ethylbenzene, diethyl benzene or methyl ethylbenzene and polar compound is selected from water, methanol, ethanol or acetone.

This invention relates to a method for preparing divinylbenzene by diethylbenzene dehydrogenation. The method uses Fe-K-Ce-Mo catalyst system, and keeps high catalytic selectivity and anti-carbon deposition ability by adjusting the ratio of the above elements as well as adding multiple rare earth compounds. The method has a high divinylbenzene yield, and can be used for divinylbenzene industrial manufacture.

The invention discloses a preparation method of a p-diethylbenzene catalyst by using high-efficiency alkylation of ethylbenzene, and belongs to the technical field of preparation of catalysts. The preparation method comprises the following steps of mixing a nanometer hydrogen type ZSM-5 molecular sieve, an adhesive and an extrusion additive; adding an inorganic acid solution and modified components of magnesium and phosphor in the kneading process, mixing, peptizing, extruding, forming, and treating by hydrothermal aging, so as to improve the stability of the catalyst; impregnating the modified component of silicon in the carrier by one step, so as to obtain the catalyst, wherein the pore size of the molecular sieve of the catalyst and the acidity at the outer surface are modified, and thereaction property and stability are obviously improved under the synergistic modifying function of magnesium, silicon and phosphor. The preparation method has the advantages that compared with the prior art, the modified components of magnesium and phosphor can be directly lead in the strip extruding process, so that the preparation process is simplified, and the industrial production cost is reduced; after the prepared catalyst is evaluated by a fixed bed miniature reaction device in a laboratory, the selectivity on p-diethylbenzene reaches 98.5%, the conversion rate of ethylbenzene reaches20%, and the stable running period is 350h.

The invention relates to a carboxyl functional high-cross-linking monodisperse polymer microsphere and a preparation method thereof. The method comprises the following steps: adopting solvent thermal precipitation polymerization for adding methacrylic acid, diethyl benzene and initiator into solvent and uniformly mixing; placing into a stainless steel reaction kettle; increasing temperature and polymerizing; controlling the reaction temperature within 82 DEG C-200 DEG C and the reaction time within 1-12 hours; washing the acquired product with the solvent; centrifugally precipitating and drying, thereby acquiring the carboxyl functional high-cross-linking monodisperse polymer microsphere. The preparation method provided by the invention is simple; the monomer dosage reaches 20%; the microsphere yield is above 90%; the acquired microsphere is high in carboxyl content and is excellent in hydrophilicity.

The present invention is a kind of catalyst containing MCM-22 zeolite 30-90 wt%, halogen counting in simple substance 0.1-2 wt% and alumina matrix in the balanced amount. The catalyst is used in liquid phase benzene alkylating reaction, and compared with available technology, the catalyst has raised ethyl benzene selectivity, lowered diethyl benzene and triethyl benzene selectivity, and 7.3-10.0 % raised ethyl benzene STY.

The invention relates to a method for utilizing an extractive distillation process to separate diethyl benzene from C10 arene, comprising: firstly, mixed components of meta-diethyl benzene in C10 arene and other high boiling point components are separated off, with a rectification temperature of between 176 and 182DEG C; then an extractant is added in a meta-diethyl benzene mixture for separating out m-diethyl benzene, wherein, the extractant is dimethyl phthalate, dibutyl phthalate or a mixture thereof; and the extractant and the mixed components of meta-diethyl benzene have a feeding weight ratio of 5 to 20:1, the charging temperature of the extractant is between 120 and 190 DEG C, and the separation temperature is 160 to 190 DEG C; and finally the extractant and the p-diethyl benzene are separated for recovering the extractant through distillation separation; and the method has advantages of simple process, stable operation, low energy consumption, high purity of separated products, good separation effect and thermal stability of extractant, economy and acquirability, and the p-diethyl benzene content can reach over 98 percent, and the m-diethyl benzene content can reach above 70 percent.

The invention relates to a method for preparing p-diacetylbenzene by biomimetic catalytic oxidation of p-diethylbenzene with oxygen, comprising the following steps: taking p-diethylbenzene as the raw material, selecting any one of 1-30ppm of mononuclear metalloporphyrin and mu-oxo-dinuclear metalloporphyrin or the composition of the two substances as the catalyst under normal pressure and in the absence of solvents, introducing oxygen at the flow rate of 10-60mL/min, initiating reaction at 140-170 DEG C and then carrying out reaction at 80-130 DEG C for 10-20h, thus obtaining the p-diacetylbenzene. In the method, the way of high temperature quick initiation and low temperature reaction is adopted, thus minimizing the reaction initiation time, greatly shortening the reaction time, improving the reaction efficiency, reducing the energy consumption, lowering the operation cost and improving the reaction safety.

A preparation method and an application of a molecular sieve catalyst containing an aluminum phosphate binder particularly comprises following steps: (1) exchanging a prepared ultrafine rare earth ZSM-11 molecular sieve with an ammonium nitrate solution, drying the molecular sieve and roasting the molecular sieve to prepare an H-rare earth ZSM-11 molecular sieve; (2) supporting zinc on the H-rare earth ZSM-11 molecular sieve by a zinc salt through a conventional impregnation method, drying the molecular sieve and roasting the molecular sieve; and (3) mixing a phosphoric acid solution and boehmite to generate colloidal aluminium phosphate and uniformly mixing the colloidal aluminium phosphate with the zinc-type molecular sieve prepared in the last step according to a certain weight ratio, drying the molecular sieve and roasting the molecular sieve to obtain the molecular sieve catalyst. When the molecular sieve catalyst is used in an alkylation reaction between dimethyl ether and benzene, aromatic hydrocarbon with carbon number being 7-9 can be prepared at a high yield. The molecular sieve catalyst, compared with a molecular sieve catalyst which only contains an aluminum oxide binder, is increased in conversion rate of benzene and can promote generation of alkylation products of benzene (methyl benzene, dimethyl benzene and trimethyl benzene) and meanwhile inhibit generation of ethylation products of benzene (ethyl benzene and diethyl benzene). In addition, the molecular sieve catalyst is significantly improved in anti-carbon deposition performance.

The invention relates to a method for producing divinyl benzene by dehydrogenation of diethylbenzene, and mainly solves the technical problems of low conversion rate of diethylbenzene and high ratio of monoene to diene during long-term operation in the prior art. The method is characterized in that a raw material system composed of diethylbenzene and water reacts with a dual-catalyst system in a fixed bed reactor, and the reaction steps comprise that: a) the raw material system contacts a first catalyst M to generate a material flow I; and b) the material flow I contacts with a second catalystN to generate divinyl benzene, so that the technical problem is well solved, and the method can be used for industrial production of divinyl benzene through dehydrogenation of diethylbenzene.

The invention belongs to the field of catalytic chemistry, and particularly relates to a dehydrogenation catalyst and application thereof in preparation of divinylbenzene through dehydrogenation of diethylbenzene. The catalyst is prepared from the following components in parts by weight: 20 to 40 parts of lanthanide modified heteropolyacid salt, 10 to 20 parts of macroporous cross-linked polymer loaded nano alpha-Fe2O3, and 40-70 parts of one or more of oxides of CeO2, MnO2, ZrO2 and WO3. The supported catalyst is applied to a diethylbenzene dehydrogenation reaction, and product distribution can be effectively optimized by adjusting components in heteropolyacid salt. Water vapor is not needed in the reaction process, the reaction rate is high, selectivity is high, product system separationis simple, the technological process is safe and environmentally friendly, and industrial production is facilitated.

The invention discloses an active method of beta zeolite catalyst, which is characterized by the following: adapting inert gas with less than 0.1%(V/V) water content to pass the catalytic bed layer at 100-5000 mg/(g)h , 350-600 Deg C for 0.5-10h; fitting for benzene and ethane alkyl to synthesize ethylbenzene, benzene and diethyl benzene and or multiple ethylbenzene alkyls to produce ethylbenzene.