32results about How to "Increase the rate of the hydrogenation reaction" patented technology

Hydrogen peroxide is prepared by an auto-oxidation method via hydrogenation in a microreactor. A working solution containing a reactive carrier compound is hydrogenated with hydrogen in a microreactor and is subsequently auto-oxidized to produce hydrogen peroxide.

The present invention provides a wax oil hydrotreating method comprising the following steps: hydrogen gas is sent into a wax oil raw material by pores with the average pore size in nanometer-size to obtain hydrogen-containing wax oil; and the hydrogen-containing wax oil is fed into a tubular reactor for contacting with a hydrogenation catalyst filled in the tubular reactor under conditions of liquid-phase hydrogenation processing. Even hydrogen oil ratio is lower, and space velocity is higher, sulfur and nitrogen in the wax oil can be effectively removed, part of aromatics are saturated, hydrogen-carbon atom ratio of the wax oil can be improved, and a high-quality catalytic cracker raw material can be obtained.

The invention discloses a liquid-phase hydrogenation reactor and a hydrogenation process, comprising an inner cylinder and a reactor shell, the inner cylinder is conical, the top and bottom of the inner cylinder are open, the bottom edge is tightly connected with the inner wall of the reactor, and the inner cylinder is open. A number of small holes are opened on the cylinder wall; a ceramic membrane tube bundle is vertically arranged on the axial direction of the reactor, and the ceramic membrane tube bundle communicates with external hydrogen; the inner cylinder is filled with hydrogenation catalyst I, the annular cavity is filled with hydrogenation catalyst II, and hydrogenation catalyst I The activity of the catalyst is higher than that of the hydrogenation catalyst II; the inlet of the raw material of the reactor is connected to the top of the inner cylinder; the flow mode of the material in the inner cylinder is from top to bottom; the flow mode of the material in the annular cavity is from top to bottom. The invention can effectively control the contact time between the material and the catalyst in the whole process of the hydrogenation reaction, make the temperature rise of the catalyst bed more uniform, solve the problems of severe exotherm and inhibit the reaction conversion rate in the reaction process, and realize the whole liquid phase hydrogenation reaction process Both achieve higher hydrogenation reaction rate and conversion.

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 hydrogenation method for improving the yield of a bisphenol-A type hydrogenated epoxy resin. The method comprises a step of uniformly dispersing hydrogen which is input into a hydrogenation reaction tank by using a guidance gas stirrer with aspiration, exhaust and stirring functions in the hydrogenation reaction tank through the aspiration, exhaust and stirring of the guidance gas stirrer. The method ensures that reaction fluid contains high-concentration dissolved hydrogen, so that a hydrogenation catalyst has extremely high activity and the rate of a hydrogenation reaction is accelerated; and the method can ensure that the hydrogenation reaction is performed at low temperature and under low pressure, even increase the yield of the bisphenol-A type hydrogenated epoxy resin to be between 99.0 and 99.9 percent, greatly reduce the construction and maintenance cost of the hydrogenation reaction tank, and improve economic benefit.

The utility model relates to a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthetic gas and preparing ethylene glycol by hydrogenation. The device system comprises an esterification reaction system, a carbonylation reaction system, a relief gas and waste acid coupled recovery system and a hydrogenation reaction system, wherein the esterification reaction system is used for generating methyl nitrite by reaction; methyl nitrite is treated by the carbonylation reaction system to generate a carbonylation product mainly containing dimethyl oxalate and dimethyl carbonate; the carbonylation product is separated to obtain a dimethyl carbonate, and the rest dimethyl oxalate is treated by the hydrogenation reaction system to generate an ethylene glycol product; waste acid in the esterification reaction and relief gas in the carbonylation reaction are recycled by the relief gas and waste acid coupled recovery system. The device system has the characteristic that the energy consumption is remarkably reduced; the effect is remarkable in combination with the application of the useful substance recycling step, particularly high coupling of waste nitric acid and relief gas recycling as well as recycling of hydrogen in waste gas during separation and reaction.

The invention relates to a method for preparing cyclohexane carboxylic ester from benzene polycarboxylic ester, aiming at improving a hydrogenation method of the benzene polycarboxylic ester. In the method, the benzene polycarboxylic ester is hydrogenated to form cyclohexane polycarboxylic ester by utilizing a reaction groove provided with a guidance air stirrer having an air extracting and discharging capability in the presence of a hydrogenation catalyst. The preparation method has the advantages that the operation pressure for hydrogenating the benzene polycarboxylic ester is reduced to the minimum, the hydrogenation reaction temperature is greatly reduced, and the yield obtained by hydrogenating the benzene polycarboxylic ester into the cyclohexane polycarboxylic ester is effectively improved.

The invention provides a method for continuous hydrogenation of dinitrobenzene and recycling of reaction heat thereof. The method comprises the following steps: (1) adopting a plurality of stages of hydrogenation reaction kettles which are connected in series, continuously leading the materials dinitrobenzene and methanol to a first stage of a hydrogenation reaction kettle, and simultaneously leading in hydrogen continuously and adding a catalyst, carrying out a liquid-phase catalytic hydrogenation reaction, and continuously feeding the material from the final stage of hydrogenation reaction kettle to a mature kettle to cure and cool; meanwhile, removing hydrogenation reaction heat by water, so as to obtain hot water of 105-120 DEG C; and (2) orderly carrying out continuous sedimentation, filtering and separation on hydrogenation reduction cooling fluid from the mature kettle, and then recovering and mechanically applying the separated catalyst in cycle, and carrying out dealcoholization, dehydration and rectification on the separated hydrogenation reduction fluid to obtain diaminobenzene. Thus, effective utilization of reaction heat energy is achieved on the premise of efficiently producing the diaminobenzene; the aim of saving energy is achieved.

The invention discloses a fixed-bed hydrogenation reactor and a heavy oil liquid-phase hydrogenation process. The hydrogenation reactor comprises an outer cylinder and an inner cylinder of the reactor, an annular area is formed between the outer cylinder and the inner cylinder, and the transverse direction of the inner cylinder is The cross-sectional area gradually increases from top to bottom, the inner cylinder wall is evenly opened and connected to the annular area, the top opening of the inner cylinder is flush with the bottom of the upper head of the reactor, and the bottom of the inner cylinder is tightly connected with the lower head of the reactor; A shell-and-tube ceramic membrane tube assembly is arranged at the bottom, the hydrogen supplementation pipeline is communicated with the ceramic membrane tube, and the liquid-phase feed pipeline is communicated with the inner cavity of the shell outside the ceramic membrane tube; the inner tube and the annular area are alternately arranged with baffles at different heights; The cylinder is filled with hydrogenation catalyst I, the annular region is filled with hydrogenation catalyst II, and the activity of hydrogenation catalyst I is higher than that of hydrogenation catalyst II. The method of the invention firstly performs viscosity reduction treatment on the heavy oil raw material, and then makes the material undergo hydrogenation reaction with different active catalysts alternately in the inner cylinder and the annular area along the flow channel arranged in the reactor, that is, the high activity and temperature rise in the early stage of the reaction can be controlled. It is a big problem, ensuring a high conversion rate in the middle of the reaction, reducing the deep cracking reaction in the high-temperature stage in the later stage of the reaction, and improving the liquid yield.

A heavy oil hydrogenation conversion method. Under a condition of a heavy oil hydrogenation conversion reaction, a heavy oil raw material mixture containing heavy oil raw materials and a catalyst is allowed to contact hydrogen in a tubular reactor, and heavy oil macromolecules are converted into gas and liquid hydrocarbon reaction products, wherein the contact between hydrogen and the heavy oil raw material mixture is performed at least twice. The invention adopts a tubular reaction which has a small diameter and is simple in manufacturing and installation; by means of multi-time hydrogen injection, the invention reduces the hydrogen excessive amount during the reaction, and improves the utilization rates of hydrogen and the reactor. The heavy oil direct hydrogenation conversion method provided by the invention can improve the efficiency of heavy oil direct hydrogenation conversion, thus reduces cost for heavy oil hydrogenation conversion, and improves the technical economy of heavy oil hydrogenation conversion.

The invention provides a method for stabilizing hydrogenation of direct coal liquefied oil, which comprises sending hydrogen gas into the direct coal liquefied oil through pores with an average pore diameter of nanometer size to obtain hydrogen-containing liquefied oil; flowing the hydrogen-containing liquefied oil upwards It is sent into a tubular fixed-bed reactor by means of a liquid-phase hydrotreating condition to contact with a hydrogenation catalyst. This method can obtain better hydrogenation treatment effect, effectively reduce the content of sulfur and nitrogen and residual carbon in the direct coal liquefaction oil, partially hydrogenate the polycyclic aromatic hydrocarbons in the direct coal liquefaction oil, and reduce the colloid and asphaltene content. Moreover, the method does not need to circulate hydrogen, reduces the scale of the hydrogenation reaction device, reduces the pressure level of the gas-liquid separation device, and reduces the investment cost and operating energy consumption of the hydrogenation device. In addition, the method can make the hydrogenation raw material carry a sufficient amount of hydrogen without introducing diluent oil and / or cycle oil into the hydrogenation raw material, and improves the effective processing capacity of the hydrogenation reaction device.

The invention discloses a method for reducing aromatic hydrocarbon by indirect hydrogen transfer. The aromatic hydrocarbon is reduced into hydrocarbon alkyl in the presence of catalyst, hydrogen transfer medium and hydrogen; and the reduction reaction conditions are as follows: dose ratio of the catalyst to the aromatic hydrocarbon is 0.11-1g / 0.05mol; dose ratio of the hydrogen transfer medium to the aromatic hydrocarbon is 0.005-0.05mol / 0.05mol; hydrogen is filled to 0.2-0.4MPa; reaction temperature is 50-180 degrees centigrade; and the reaction time is 1-7h. The method for reducing aromatic hydrocarbon disclosed by the invention is convenient to operate and high-efficiency.