40results about How to "Avoid overhydrogenation" patented technology

The invention discloses a hydrodechlorination catalyst. The hydrodechlorination catalyst consists of main catalysts, an adjuvant and a carrier, wherein the main catalysts are Pd and Cu, the adjuvant is selected from one or a combination of two or three or more of Mg, Ca, Ba, Co, Mo, Ni, Sm and Ce, and the main catalysts and the adjuvant are loaded onto the activated carbon carrier. The hydrodechlorination catalyst provided by the invention is applicable to the preparation of chlorotrifluoroethylene from CFC-113 through catalytic hydrodechlorination and has the advantages of long service life, high chlorotrifluoroethylene selectivity and the like.

The invention discloses a preparation method and application of an oxidization modified carbon nanotube-loaded double-metal copper and magnesium co-doped nickel-based multi-metal catalyst. A multi-wall carbon nanotube loaded multi-metal nickel-based catalyst subjected to hydrogen peroxide oxidization is utilized and Cu is introduced so that the reduction energy of a Ni precursor can be effectively reduced and the dispersion of Ni nanoparticles on the surface of the carbon nanotube is accelerated; meanwhile, more Ni<0+> can be formed under the synergistic effect of Cu and Ni. Mg is introduced so that a large quantity of alkaline sites are provided for the surface of the catalyst; meanwhile, a NiO-MgO co-solution is formed so that excessive hydrogenation of reactants is easy to inhibit and excessive byproducts are not formed. Oxidization treatment of the carbon nanotube can be used for further accelerating a strong mutual effect of the carbon tube and active components, so that the hydrogenation activity of the catalyst is greatly improved; the catalyst is used for adiponitrile hydrogenation reaction and relatively high conversion ratio and total selectivity of products can be obtained.

The invention discloses a hydrogenation process for producing a hydrogen peroxide by an anthraquinone method. The hydrogenation process comprises the following steps that: (1) two reactors are arranged in the hydrogenation process for producing the hydrogen peroxide by the anthraquinone method; a first current of fresh hydrogen and a working liquid serve as a feeding material I and perform hydrogenation in the first reactor; the reacted material is subjected to gas-liquid separation to obtain a gas phase and a liquid phase, wherein part of the liquid phase is recycled back to the first reactor; the rest of the liquid phase is reasonably optimized and modulated; the phenomenon that the reaction hydrogen is deficient or excessive is avoided; the hydrogenation completeness is realized; the liquid phase and the gas phase are mixed to serve as feeding material II and enter the second reactor; (2) a second current of fresh hydrogen and the feeding material II perform the hydrogenation in the second reactor; the reacted material is subjected to the gas-liquid separation to obtain a gas phase and a liquid phase, wherein part of the liquid phase is recycled back to the second reactor, and the rest of the liquid phase enters an oxidation process. According to the process disclosed by the invention, a hydrogenation process is optimized, and meanwhile, side effects are reduced, so that the hydrogenation is more uniform, and the service life of a catalyst is prolonged.

The invention provides a preparation method of 2, 5-furandimethanol. The preparation method comprises the following step of: in a hydrogen atmosphere, carrying out catalytic hydrogenation on 5-hydroxymethylfurfural by using Y molecular sieve-encapsulated nano platinum as a catalyst to obtain 2, 5-furandimethanol. According to the preparation method, catalytic hydrogenation is carried out on the 5-hydroxymethylfurfural by using the Y molecular sieve-encapsulated nano platinum, so that the 5-hydroxymethylfurfural can be adsorbed on the surfaces of platinum particles in an endpoint adsorption conformation instead of a lying adsorption conformation. According to the endpoint adsorption conformation, on one hand, one end of the hydroxyl of the 5-hydroxymethylfurfural is vertically adsorbed, sothat the hydrogenation rate of the hydroxyl is greatly reduced; on the other hand, the hydrogenation rate of the aldehyde group of the 5-hydroxymethylfurfural on the surfaces of the platinum particlesis increased; and therefore, catalytic hydrogenation selectivity higher than 99% can be achieved, and excessive hydrogenation of furan rings is completely avoided.

The invention discloses a method for producing a light arene product and a clean fuel oil product from catalytic cracking diesel oil. The method is characterized by comprising the following steps: (1) mixing the catalytic cracking diesel oil with hydrogen, mixing with a cracking product and simultaneously performing a hydro-refining reaction so as to remove sulfur and nitrogen impurities, and performing an olefin saturation process and an arene hydrogenation saturation process; (2) catalyzing distillate oil of the diesel oil for cutting after the hydro-refining process is finished, wherein the distillate oil at a temperature greater than 355 DEG C is returned for hydrocracking after being mixed with the hydrogen; (3) extracting the cut distillate oil to obtain extract oil rich in poly-aromatic hydrocarbon and raffinate oil rich in alkane; (4) taking the raffinate oil rich in alkane as a clean diesel oil blending component; (6) cutting and separating an extract oil hydro-cracking product, wherein the distillate oil at a temperature greater than 195 DEG C is taken as the clean diesel oil blending component, and the distillate oil at a temperature less than195 DEG C is utilized to obtain the light arene product and the clean gaseous blending component.

The invention discloses a gasoline modification method. The method comprises: subjecting the gasoline light fraction fractionated from a catalytic cracking distillation tower lateral line to fixed bed oxidation deodorization, converting mercaptan into a disulfide, mixing the deodorized product with thermocatalytic diesel oil, subjecting the mixture to fractionation in a prefractionator so as to obtain light fraction and diesel oil fraction; carrying out a hydrogenation pretreatment on heavy fraction obtained from an FCC (fluid catalytic cracking) fractionating tower, removing unstable diene and mercaptan, then performing selective hydrodesulfurization through high activity / low activity combination, and mixing the desulfurization product with the deodorized light fraction so as to obtain a clean gasoline product. Compared with the prior art, the method disclosed in the invention can produce the clean gasoline product with a sulfur content of less than 10 micrograms / g and an octane number loss of not greater than 1.5 units. Meanwhile, the colloid generated by oxidation deodorization and the coking precursor generated by diene under a high temperature can be prevented from influencing normal operation of hydrogenation equipment, thus prolonging the equipment operating cycle. The method provided in the invention has the advantages of wide raw material adaptability and flexibility, mature technology, and high reliability.

The invention relates to a method for preparing enol by electrocatalytic selective hydrogenation of alkynol, which comprises but is not limited to terminal alkynol such as 2-methyl-3-butyne-2-ol, 1, 4-butynediol, methyl butynol, ethynyl cyclohexanol, dehydrolinalool and the like, non-terminal alkynol, cyclic alkynol, alkynodiol and the like. Different types of electrolytic tanks can be adopted; the contact resistance between a catalyst and an ion exchange membrane can be reduced by a preparation process of a membrane electrode in a flow type electrolytic tank; the split H-type electrolytic tank can control the mass transfer rate of alkynol selective hydrogenation. The method is an electro-catalysis mode which is green, safe, low in cost and high in efficiency, compared with a traditional thermal catalysis technology, the method can selectively reduce reactant alkynol into enol at the room temperature and normal pressure, water serves as a hydrogen source to replace flammable and explosive hydrogen, energy consumption and potential risks in the process can be greatly reduced, the requirement of green chemical engineering is met, and the method is suitable for industrial production. The method has great strategic significance.

The invention discloses an in-situ method for synthesizing Pd-IL / Al 2 o 3 Methods and applications of mesoporous catalysts. The method comprises: (1) preparing an ethanol solution of P123; (2) dissolving concentrated nitric acid in absolute ethanol, then adding weighed aluminum isopropoxide, stirring vigorously so that the aluminum isopropoxide is completely dissolved, and dissolving the obtained solution Slowly drop into the ethanol solution of P123; (3) drop a certain concentration of palladium solution into the solution obtained in step (2), and stir vigorously at room temperature for 1-3 days; (4) after the stirring is completed, the solution is transferred to Evaporate the solvent in an oven to obtain a sponge-like sample; (5) put the sponge-like sample in a muffle furnace and bake it at 300-700°C for 3-6h to obtain the Pd / mesoporous Al 2 o 3 ; (6) in Pd / mesoporous Al 2 o 3 Ionic liquid loaded on the surface, that is, Pd-IL / mesoporous Al was prepared 2 o 3 catalyst. Pd-IL / mesoporous Al prepared by the present invention 2 o 3 The catalyst is applied in the selective hydrogenation reaction of acetylene, and exhibits excellent catalytic performance, wherein the conversion rate of acetylene is ≥99.0%, and the ethylene selectivity is ≥90%.

The invention discloses a hydrogenation technology for producing hydrogen peroxide by an anthraquinone process, which comprises the following steps: operating fluid and hydrogen-containing gas in the hydrogenation technology for producing hydrogen peroxide by the anthraquinone process are introduced in a reactor along flowing direction of materials in the reactor, a hydrogenation reaction is carried out on a bed layer of a catalyst, each strand of operating fluid corresponds a strand of hydrogen-containing gas, wherein hydrogen-containing gas is divided into 2-10 strands, the strand number of operating fluid is less than that of the hydrogen-containing gas, The last strand of the material long the flowing direction of the material is the hydrogen-containing gas. The technology can effectively avoid the excessive hydrogenation, increase hydrogen effect and prolong the usage life of the catalyst.

The invention discloses a hydrogenation process for producing a hydrogen peroxide by an anthraquinone method. The hydrogenation process comprises the following steps that: (1) two reactors are arranged in the hydrogenation process for producing the hydrogen peroxide by the anthraquinone method; a first current of fresh hydrogen and a working liquid serve as a feeding material I and perform hydrogenation in the first reactor; the reacted material is subjected to gas-liquid separation to obtain a gas phase and a liquid phase, wherein part of the liquid phase is recycled back to the first reactor; the rest of the liquid phase is reasonably optimized and modulated; the phenomenon that the reaction hydrogen is deficient or excessive is avoided; the hydrogenation completeness is realized; the liquid phase and the gas phase are mixed to serve as feeding material II and enter the second reactor; (2) a second current of fresh hydrogen and the feeding material II perform the hydrogenation in the second reactor; the reacted material is subjected to the gas-liquid separation to obtain a gas phase and a liquid phase, wherein part of the liquid phase is recycled back to the second reactor, and the rest of the liquid phase enters an oxidation process. According to the process disclosed by the invention, a hydrogenation process is optimized, and meanwhile, side effects are reduced, so that the hydrogenation is more uniform, and the service life of a catalyst is prolonged.

The invention discloses a method for synthesizing benzphenyl alcohol by catalytic hydrogenation of benzophenone. The method is as follows: the method adopts a supported multi-component catalyst and adds a protective agent in the reaction system; the supported The multi-component catalyst is Pd-Cu-Sn / C, the carrier is activated carbon, the active component is Pd, and the additives are Cu and Sn, wherein the loading of Pd is 1-10wt%, and the loading of Cu is 1-5wt %, the load of Sn is 1-5wt%; the protective agent is sodium acetate. The method of the invention can improve the conversion rate of benzophenone and the selectivity of benzhydryl alcohol.

The invention relates to a method for combined hydrogenation of heavy oil. The method adopts an online hydrogenation combined process of a boiling bed and a fixed bed, light oil obtained by hydrogenation of the boiling bed does not undergo the processes of pressure reduction and frictional distillation, light oil gas phase lower than 350 DEG C obtained by a warm high-pressure separator directly enters a fixed bed reactor for hydrogenation reaction, thus avoiding the defect of complex process caused by the procedure of firstly performing product pressure reduction and separation and then performing pressure-rising and temperature-rising hydrogenation of a conventional offline hydrogenation combined process, reducing the content of wax oil component in the light oil of the fixed bed reactor,and improving the selectivity of the hydrorefining reaction. In addition, the method also has the advantages of being high in light oil yield, small in catalyst consumption, reasonable in energy utilization, compact in process flow and low in device energy consumption.