37results about How to "Improve hydrogen efficiency" patented technology

The invention relates to a slurry bed loop reactor, application and a method for producing hydrogen peroxide. The slurry bed loop reactor comprises a riser, a separation tank and a downcomer which are communicated sequentially, wherein an expansion section with expanded pipe diameter is arranged at the upper part of the riser, the upper part of the expansion section is communicated with the separation tank, a liquid phase outlet in the upper part of the separation tank is communicated with the upper part of the downcomer, the bottom of the downcomer is communicated with the bottom of the riser, and the bottom of the separation tank is communicated with the lower part of the downcomer; and a raw material inlet is formed in the bottom of the riser, gas outlets are formed in the top of the expansion section of the riser and in the top of the separation tank, a filtration component is arranged in the downcomer and a clear liquid outlet is formed in the upper part of the downcomer via the filtration component. According to a hydrogenation method for producing hydrogen peroxide by an anthraquinone method with the adoption of the slurry bed loop reactor, the gas-liquid-solid three-phase separation efficiency is high, the excess local liquid holdup of a catalyst is avoided, the possibility of excessive hydrogenation is reduced, the hydrogenation efficiency is further effectively improved and a hydrogen peroxide product with relatively high concentration can be obtained.

The invention discloses a slurry-bed circulation flow reactor and an application and a method for producing hydrogen peroxide. The slurry-bed circulation flow reactor comprises an ascension pipe, an expanding section used for expanding pipe diameter of the upper part of the ascension pipe and a solid-liquid separator, wherein the expanding section is communicated with the upper part of the solid-liquid separator; the bottom of the solid-liquid separator is communicated with the bottom of the ascension pipe; a three-phase separator of a double sleeve structure is arranged in the expanding section; a raw material inlet is formed in the bottom of the ascension pipe; a gas outlet is formed in the top of the expanding section; a filtration component is arranged in the solid-liquid separator; and a clear liquid outlet is arranged at the upper part of the solid-liquid separator by virtue of the filtration component. According to a method for producing hydrogen peroxide by taking the slurry-bed circulation flow reactor as a hydrogenation reactor, the gas-liquid-solid three-phase separation efficiency is high; the local excessive hydrogenation of the catalyst is avoided; the excessive hydrogenation possibility is reduced; the hydrogenation efficiency is high; and hydrogen peroxide products with high concentration can be produced.

A preparation method of hydrogen peroxide is as follows: a working liquid and a hydrogen-containing gas are introduced into a slurry bed reactor, in the presence of a catalyst, the working liquid reacts with hydrogen to obtain a hydrogenated liquid, the hydrogenated liquid reacts with oxygen in an oxidation reactor to obtain an oxidizing solution containing hydrogen peroxide; the oxidizing solution is extracted and separated to obtain a hydrogen peroxide solution and a working fluid, the slurry bed reactor comprises a reaction cylinder (1), a separator (2) and a filter (3), a top opening of the reaction cylinder (1) extends into the separator (2), the outer wall of the reaction cylinder (1) is connected with the bottom of the separator (2), the separator (2) is communicated with the filter (3) by a liquid phase outlet (14), and a slurry outlet of the filter (3) is communicated with the bottom of the reaction cylinder (1). The method provided by the invention is stable in operation and easy in industrialization amplification. In the process of preparing of hydrogen peroxide, no alkali is introduced, and the danger of explosion led by hydrogen peroxide decomposition caused by an alkali can be avoided.

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 process for hydrogen peroxide production. The process comprises the following steps: (1) in a hydrogenation process for producing hydrogen peroxide by an anthraquinone process, arranging a hydrogenation tower I, a hydrogenation tower II and a hydrogenation tower III, and feeding hydrogen gas in three channels, i.e., hydrogen gas I, hydrogen gas II and hydrogen gas III; (2) mixing and dissolving working fluid feed and the hydrogen gas I in high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower I for a first-stage hydrogenation reaction; (3) mixing and dissolving effluent of the first-stage hydrogenation reaction and the hydrogen gas II in the high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower II for a second-stage hydrogenation reaction; (4) mixing and dissolving effluent of the second-stage hydrogenation reaction and the hydrogen gas III in the high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower III for a third-stage hydrogenation reaction; and (5) enabling a material obtained after the third-stage hydrogenation reaction to flow out, carrying out gas-liquid separation, and going to next procedure. According to the process, through controlling the proportion of dissolved hydrogen, not only can a relatively high hydrogenation effect be achieved, but also minimal anthraquinone degradation products are obtained, so that the improvement on product concentration and device scale and the lowering of the consumption of a catalyst and anthraquinone are facilitated.

The invention discloses a preparation method of a high-activity low-byproduct propylene gas phase epoxidation catalyst. In the preparation process of the catalyst, a defect site auxiliary agent and an S auxiliary agent are added, titanium-rich defect sites suitable for Au loading are obtained, amorphous species on the catalyst are stabilized by S, then the high-activity propylene gas phase epoxidation catalyst is obtained, and alkali metal ions introduced at the same time with the S auxiliary agent can reduce the production probability of by-products, so that the conversion rate of propylene, the selectivity of PO and the hydrogen efficiency are greatly improved.

The invention discloses a working solution for producing hydrogen peroxide through an anthraquinone process. The working solution comprises a solvent and a working solution carrier, wherein the solvent comprises the following components in percentage by volume: 50-80% of heavy aromatics, preferably 70-75 percent, and 20-50% of N-octyl pyrrolidone, preferably 25-30 percent; the working solution carrier refers to alkyl anthraquinone. The working solution adopts a two-component solvent system, the anthraquinone solubility is improved, and the hydrogenation efficiency is improved. Compared with a three-component system, the two-component solvent system has the advantages that the composition is simplified, and the production cost is reduced.

The invention relates to a solvent system in a working liquid for hydrogen peroxide production with an anthraquinone method, wherein the solvent system comprises, by volume, 40-70% of heavy aromatic hydrocarbon, 5-30% of trioctyl phosphate, 10-20% of 2-phenylethanol, 10-20% of diethanol dimethyl ether, and 0.5-5% of acetic acid. According to the present invention, the raw material components of the solvent system are easy to obtain; with the application of the solvent system to prepare the working liquid, compared to the working liquid prepared from the heavy aromatic hydrocarbon and trioctyl phosphate two-component solvent system in the prior art, the working liquid prepared from the solvent system of the present invention has the good hydrogen efficiency under the production condition.

The invention discloses a solvent system and method of producing hydrogen peroxide through anthraquinone process. The solvent system is prepared from the following components in volume percentage: 50-80 percent of heavy aromatics, and 20-50 percent of N,N'-diethylethanediamide. The hydrogen peroxide is prepared through the anthraquinone process by dissolving alkyl anthraquinone in the solvent system to serve as a working solution. The solvent system used in the prior art is generally bi-component or tri-component, the bi-component solvent system has low solubility on alkyl anthraquinone, thereby lowering hydrogenation efficiency; although the tri-component or more components solvent system can improve the solubility on alkyl anthraquinone to a certain degree, and improve catalytic efficiency, the system is made to be more complex, and the production cost of hydrogen peroxide is increased. According to the bi-component solvent system adopted by the invention as the solvent system of producing hydrogen peroxide through the anthraquinone process, the composition is simple, the cost is low, the solubility on alkyl anthraquinone is improved, and therefore the hydrogenation efficiency isimproved.

An organic solvent system for preparing H2O2 is prepared from C9-C10 arylhydrocarbon (100 wt portions), trioctyl phosphate (0.5-50), and 2-methylcyclohexyl acetate (0.5-90). Its advantages are high solubility of anthraquinone and hydrogenated anthraquinone in it, low by-effect and high productivity of H2O2.

The invention relates to a loop reaction device in a slurry bed, application and a method for producing hydrogen peroxide. The loop reaction device comprises a slurry bed reactor and a solid-liquid separator, wherein the upper part of the slurry bed reactor is communicated with the upper part of the solid-liquid separator, and the bottom of the slurry bed reactor is communicated with the bottom of the solid-liquid separator; and a coaxial inner sleeve is arranged in the slurry bed reactor, an outer sleeve is arranged between the inner sleeve and the outer wall of the slurry bed reactor at the upper part of the slurry bed reactor, a raw material inlet and a fluid distributor are arranged in the inner sleeve and at the bottom, a gas outlet is formed in the top of the slurry bed reactor, a filtration component is arranged in the solid-liquid separator, and a clear liquid outlet is formed in the wall of the solid-liquid separator via the filtration component. According to a hydrogenation method for producing hydrogen peroxide by an anthraquinone method with the adoption of the slurry bed loop reactor, the gas-liquid-solid three-phase separation efficiency is high, the excess local liquid holdup of a catalyst is avoided, the possibility of excessive hydrogenation is reduced, the hydrogenation efficiency is further effectively improved and a hydrogen peroxide product with relatively high concentration can be obtained.

A solvent system and method for producing hydrogen peroxide by anthraquinone method, the solvent system includes the following components in terms of volume percentage: heavy aromatics: 50%~80%, N,N′-diethyloxalamide : 20%~50%. Alkyl anthraquinone is dissolved in the above solvent system as a working solution, and hydrogen peroxide is prepared by anthraquinone method. The solvent system used in the prior art is generally two-component or three-component, and the two-component has low solubility for alkyl anthraquinone, thereby reducing the problem of hydrogenation efficiency. Although the three-component or even more components are to a certain extent It can improve the solubility of alkyl anthraquinone and improve the catalytic efficiency, but it will complicate the system and increase the production cost of hydrogen peroxide. The two-component system of the present invention is used as a solvent system for producing hydrogen peroxide by an anthraquinone method, has simple composition and low cost, and can increase the solubility of alkyl anthraquinone, thereby improving the hydrogen efficiency of the reaction.

The invention discloses a hydrogenation process for hydrogen peroxide production. The process comprises the following steps: (1) in a hydrogenation process for producing hydrogen peroxide by an anthraquinone process, arranging a hydrogenation tower I, a hydrogenation tower II and a hydrogenation tower III, and feeding hydrogen gas in three channels, i.e., hydrogen gas I, hydrogen gas II and hydrogen gas III; (2) mixing and dissolving working fluid feed and the hydrogen gas I in high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower I for a first-stage hydrogenation reaction; (3) mixing and dissolving effluent of the first-stage hydrogenation reaction and the hydrogen gas II in the high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower II for a second-stage hydrogenation reaction; (4) mixing and dissolving effluent of the second-stage hydrogenation reaction and the hydrogen gas III in the high-pressure gas dissolving equipment, and then, enabling the solution to enter the hydrogenation tower III for a third-stage hydrogenation reaction; and (5) enabling a material obtained after the third-stage hydrogenation reaction to flow out, carrying out gas-liquid separation, and going to next procedure. According to the process, through controlling the proportion of dissolved hydrogen, not only can a relatively high hydrogenation effect be achieved, but also minimal anthraquinone degradation products are obtained, so that the improvement on product concentration and device scale and the lowering of the consumption of a catalyst and anthraquinone are facilitated.

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 slurry bed hydrogenation reactor for preparing hydrogen peroxide by adopting an anthraquinone process and application of the slurry bed hydrogenation reactor. The hydrogenation reactor comprises an ascension pipe, an expanding section for expanding the upper pipe diameter of the ascension pipe, and a solid-liquid separator, wherein the expanding section is communicated with the upper part of the solid-liquid separator; the bottom of the solid-liquid separator is connected with the bottom of the ascension pipe; a guide cylinder is arranged in the expanding section; the bottom of the ascension pipe is provided with a raw material inlet; the top of the expanding section is provided with a gas outlet; a filter assembly is arranged in the solid-liquid separator and provided with a purified liquor outlet. The method for preparing the hydrogen peroxide is characterized in that the slurry bed hydrogenation reactor is applied to a hydrogenation unit, the gas-liquid-solid three-phase separation efficiency is high, the catalyst locality cannot be excessively hydrogenated, the excessive hydrogenation possibility is reduced, the hydrogenation efficiency is high, and a hydrogen peroxide product with the relatively high concentration can be obtained.

The invention discloses a high-activity propylene gas-phase epoxidation catalyst and a preparation method thereof. In the preparation process of the catalyst, a defect site auxiliary agent and an S auxiliary agent are added, a large number of defect sites which are rich in titanium and suitable for Au loading are obtained, amorphous species on the catalyst are stabilized by S, the high-activity propylene gas-phase epoxidation catalyst is obtained, and the conversion rate of propylene, the selectivity of PO and the hydrogen efficiency are greatly improved.

The invention discloses a slurry-bed circulation flow reactor and an application and a method for producing hydrogen peroxide. The slurry-bed circulation flow reactor comprises an ascension pipe, an expanding section used for expanding pipe diameter of the upper part of the ascension pipe and a solid-liquid separator, wherein the expanding section is communicated with the upper part of the solid-liquid separator; the bottom of the solid-liquid separator is communicated with the bottom of the ascension pipe; a three-phase separator of a double sleeve structure is arranged in the expanding section; a raw material inlet is formed in the bottom of the ascension pipe; a gas outlet is formed in the top of the expanding section; a filtration component is arranged in the solid-liquid separator; and a clear liquid outlet is arranged at the upper part of the solid-liquid separator by virtue of the filtration component. According to a method for producing hydrogen peroxide by taking the slurry-bed circulation flow reactor as a hydrogenation reactor, the gas-liquid-solid three-phase separation efficiency is high; the local excessive hydrogenation of the catalyst is avoided; the excessive hydrogenation possibility is reduced; the hydrogenation efficiency is high; and hydrogen peroxide products with high concentration can be produced.