9 results about "Catalytic hydrogenation" patented technology

The invention discloses a method for updating heavy hydrocarbon to produce light oil and a plasma hydrogenation reactor for the method. The plasma hydrogenation reactor comprises a cavity and a preheater, wherein the cavity is surrounded by low-voltage electrode reaction tubes, the top and the bottom of the cavity are respectively sealed by an upper insulating flange and a lower insulating flange, the inside of the cavity is provided with high-voltage electrodes extending in the axial direction of the cavity, the low-voltage electrode reaction tubes and the high-voltage electrodes are respectively connected with a plasma power supply, the inside of the cavity, corresponding to the reaction areas of the high-voltage electrodes, is provided with insulating medium, the outside of the cavity is sheathed with a heating furnace, the preheater is communicated with the cavity by a material inlet, and the inside of the cavity, corresponding to a gas product outlet, is provided with a gas and liquid separating area. Compared with the traditional catalytic hydrogenation, the amount of free radicals of active hydrogen is increased in a doubling way by the plasma hydrogenation, the generation amount and generation speed of the free radicals of the active hydrogen can be adjusted through adjusting the discharging parameters, and the generation amount and generation speed of the free radicals of heavy oil can be adjusted through adjusting the temperature, so as to realize a matching purpose.

The invention relates to the field of preparation of biologic oil, and provides a furfural catalytic hydrogenation method under supercritical carbon dioxide and a method for preparing catalysts. The furfural catalytic hydrogenation method under supercritical carbon dioxide comprises the steps that furfural and palladium and carbon catalysts are added to a reaction still, then the reaction still is sealed, hydrogen is introduced into the reaction still to remove the air in the reaction still, liquefied carbon dioxide is injected into the sealed reaction still through a plunger metering pump, the pressure of the carbon dioxide is made to be above the critical pressure when the carbon dioxide is in an overcritical state, furfural catalytic hydrogenation and upgrading are carried out under the overcritical condition of the carbon dioxide, and a needed liquid product is prepared. The method for preparing the palladium and carbon catalysts comprises the steps of pre-processing of a carrier and preparation of the palladium and carbon catalysts (Pd/C catalysts). In the reaction process, the catalysts have no carbon accumulation phenomenon, can be recycled, largely reduce generation of by-products, and improve the selectivity of the products.

The invention discloses a method for synthesizing 2, 3-dichloropyridine (III). The method comprises that 1) pyridine (I) as a main starting raw material and chlorine undergo a full reaction in water or vapor as a reaction medium in the presence of a chlorination inducer to produce a pyridine chloride (II) as the next reaction raw material, and 2) the pyridine chloride (II) as a reaction raw material contacts with hydrogen and undergoes a catalytic hydrogenation reduction reaction in water or vapor as a reaction medium in the presence of an acid-binding agent and a catalyst to produce 2, 3-dichloropyridine (III) having purity of 99% or more, wherein the catalyst is a nanometer IrO2-ZnO-MnO2 composite catalyst. The reaction equation is shown in the description and n is 2-5. The method has the advantages of high reaction conversion rate, high selectivity, stable product quality, simple processes and low cost and solves the problem that the existing synthesis method produces 2, 3-dichloropyridine (III) having unstable quality and satisfying the quality standards after multiple rectification processes.

The invention discloses a preparation method of bromfenac sodium. O-ethylaniline and p-bromobenzoyl chloride are used as initiators and a series of reactions of Fourier reaction, substitution and oxidation salification are carried out, so that bromfenac sodium is obtained. The method has the advantages that the process is simple, post-treatment is simple and convenient, dangerous catalytic hydrogenation is avoided, the use of a strong corrosive reagent of phosphoric acid is avoided, the reaction condition is mild, the reaction yield is high, the product quality is high, the process cost is low, and the method is green and energy-saving.

The invention provides a continuous hydrogenation method of ethyl pyrazine-2-carboxylate. The continuous hydrogenation method comprises the following steps: dispersing a mixture of ethyl pyrazine-2-carboxylate and hydrogen to form a gas-liquid mixture containing small liquid drops with sizes of 50 nm-5 mm, wherein the gas-liquid mixture is used as a reaction raw material; and continuously inputting the reaction raw material into a fixed bed reactor, carrying out a catalytic hydrogenation reaction, and continuously discharging ethyl pyrazine-2-carboxylate, wherein the fixed bed reactor is divided into at least two temperature control sections along the flowing direction of the material, and the temperature of the latter temperature control section is controlled to be lower than the temperature of the former temperature control section. According to the above forced dispersion process, the reaction raw material can be subjected to high-performance mass transfer in the catalytic hydrogenation reaction process, so the sufficient reaction degree of the reaction raw material is improved, and reaction time is shortened. The fixed bed reactor is subjected to sectional temperature controlalong the flowing direction of the material, so heat accumulation can be effectively removed, a reaction state in the reactor can be effectively controlled, and the yield, purity and product performance stability of a target product, namely ethyl pyrazine-2-carboxylate are improved.

The invention relates to a method for improving the yield and selectivity of cinnamyl alcohol generated by catalytic hydrogenation of alpha, beta-unsaturated aldehyde, especially cinnamyl aldehyde. The obtained PtCoS alloy nanoparticles with cubic morphology are used as a hydrogenation catalyst, good cinnamyl aldehyde selective hydrogenation performance is shown, compared with a traditional liquid-phase catalyst, separation and recycling are facilitated, the vulcanization passivation step before the reaction can be effectively avoided, the method has wide application prospects, chloroplatinicacid, cobalt chloride and sodium sulfite are used as raw materials, in the precursor reduction process of PVP, metal and nonmetal composite alloy can be promoted to form cubic alloy through the synergistic effect of glycine and sulfite for the first time, energy consumption is reduced, and the preparation method is environmentally friendly and clean.

The invention relates to the technical field of petrochemical engineering, and especially relates to a method for preparing fuel oil by taking waste lubricating oil as a raw material. The method comprises the following steps: collecting waste lubricating oil as the raw material, distilling and collecting a fraction; mixing the fraction with water and a strong-acidic catalyst, and fully stirring and mixing the above three compositions to form a mixed solution; heating the mixed solution to 60-90 DEG C with stirring, and adjusting pH to 7 to obtain an oil-water mixture; after the oil-water mixture is stirred, standing to form an oil-water separation layer, distilling to obtain a fraction, performing hydrofinishing on the fraction, performing secondary distilling and collecting a fraction to obtain the fuel oil. By employing the method provided by the invention for preparing the fuel oil, multiple distilling is performed, and the reaction product is further subjected to deep hydrotreatment through catalytic hydrogenation, the prepared fuel oil is clarified and transparent, the disadvantages of landfill treatment of waste oil as a waste are solved, and the pollution to environment is reduced.

The invention discloses a preparation method of m-aminobenzole. The m-nitroanisole is subjected to continuous catalytic hydrogenation, then sedimentation and membrane filtration, and the m-aminobenzole is prepared. According to the method, the advantages that the production efficiency and the product quality are high, the labor intensity is low, the m-aminobenzole is environmentally friendly, thecatalyst utilization ratio is high, and the industrialization is facilitated can be achieved.