7results about How to "Improve hydrogenation efficiency" patented technology

This invention relates to the field of rubber hydrogenation, and discloses a stirred tank reactor and its application in rubber hydrogenation, as well as a batch hydrogenation method for nitrile rubber. The stirred tank reactor includes a cylindrical body and a stirrer and hollow finger-shaped baffles placed inside the body. The stirrer includes a hollow stirring shaft and a stirring paddle mounted on the shaft. A hydrogen inlet is located at the top of the hollow stirring shaft, and an annular gas distributor is located at the bottom. The hollow finger-shaped baffles include a hollow straight tube and at least two short, downward-sloping straight tubes arranged along the bottom of the tube. The bottom of the hollow straight tube is connected to a hydrogen inlet pipe at the bottom of the cylindrical body. The multiple hollow finger-shaped baffles within the stirred tank reactor enable good dispersion and mixing of hydrogen in the rubber solution, and, together with the hollow stirring shaft and gas distributor, achieve a top-to-bottom self-circulation of hydrogen in the gas phase space within the reactor, thereby improving the hydrogenation efficiency of the rubber hydrogenation reaction.

This invention discloses a working solution for synthesizing hydrogen peroxide via the anthraquinone method, comprising a solvent and a working carrier. The solvent comprises aromatic hydrocarbons, diisobutylmethanol, and terephthalamide derivative A. Terephthalamide derivative A, by volume, has C9~C64... 10 The aromatic hydrocarbon comprises 30-95 parts, preferably 60-80 parts; the diisobutylmethanol comprises 2-20 parts, preferably 5-15 parts; and the terephthalamide derivative A comprises 5-30 parts, preferably 5-15 parts; the aromatic hydrocarbon is generally C9-C6. 10 Aromatic hydrocarbons; the working carrier is one or more of anthraquinone and its derivatives. This working solution exhibits excellent solubility and mass transfer capabilities for hydrogen, anthraquinone, and hydroanthraquinone, with a hydrogenation efficiency exceeding 13 g / L. It has low miscibility with water, good extraction and separation effects, and stable physicochemical properties. It can improve the production efficiency of the anthraquinone process for producing hydrogen peroxide and has promising prospects for industrial application.

The present application relates to a kind of methyl hexahydrophthalic anhydride preparation method, comprising the following steps: with the refined methyl tetrahydrophthalic anhydride that is not isomerized as raw material, raw material and hydrogen are sent into ebullated bed hydrogenation reactor, then special catalyst is added to carry out hydrogenation;Waste hydrogen and methyl tetrahydrophthalic anhydride light component are taken out by gas phase from the top of reactor, waste catalyst is taken out from the bottom of reactor, and the hydrogenation product crude methyl hexahydrophthalic anhydride is taken out by pump control liquid level from the side of reactor;Crude methyl hexahydrophthalic anhydride is sent into the separation device with thin film evaporator and is subjected to vacuum distillation, and finished product methyl hexahydrophthalic anhydride is obtained.The catalyst used in the present application has moderate activity, high hydrogenation efficiency;Catalyst and product have no separation process, less loss, low safety risk;Post-treatment process has high heat transfer efficiency, short residence time, low colority;Product has less by-product, high yield, stable acid value and anhydride group content, and excellent performance.

The application discloses a catalytic hydrogenation method of carbon nine resin, and is characterized in that the method comprises the following steps: (1) placing a Pd-W-Yb / silica gel-activated carbon co-precipitation catalyst in the front half of a fixed bed, placing a Co-Ru-Yb / silica gel co-precipitation catalyst in the rear half of the fixed bed, and reducing by hydrogen; (2) catalytically hydrogenating pretreated carbon nine resin in the fixed bed. Compared with the prior art, the catalytic hydrogenation method of carbon nine resin has high catalytic efficiency and simple process, and the catalytic hydrogenation method can obtain a product with good colority and low bromine value.

The invention provides magnesium hydride powder and a preparation method thereof. The preparation method comprises the following steps: filling a first magnesium particle group and a second magnesium particle group into a reactor, introducing hydrogen, and heating the reactor to a reaction temperature T1 of 305-310 DEG C through an external heating mechanism, so that the second magnesium particle group and at least part of hydrogen are subjected to a first hydrogenation reaction and heat is released; the first magnesium particle group is jointly heated by heat released by the reaction of the second magnesium particle group and hydrogen and an external heating mechanism, the first magnesium particle group and the remaining hydrogen are subjected to a second hydrogenation reaction, the reaction time for converting the first magnesium particle group into magnesium hydride powder is shortened, and the magnesium hydride powder with the preset purity is obtained. According to the preparation method provided by the invention, the problems of insufficient safety, slow hydrogenation kinetics and high energy consumption of a magnesium hydride preparation process in the prior art are effectively solved, and the hydrogenation efficiency is remarkably improved.

The present application belongs to the technical field of catalyst, and particularly relates to a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator. The present application provides a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator, which comprises adding triethylaluminum mother liquor and aluminum powder mixture mixed with aluminum hydrogen structure activator in advance into a reaction kettle, heating under stirring, passing in hydrogen and pressurizing, continuously keeping hydrogen passing in during the reaction to ensure that the reaction kettle is in a constant pressure state, and obtaining target product diethylaluminum hydride and hydrogenolysis byproduct ethane after the reaction is completed. The present application provides a hydrogenation reaction with introduction of aluminum hydrogen structure activator, effectively improves the hydrogenation reaction speed and production efficiency, simultaneously reduces by-reactions and production cost, the activator is convenient to add, does not additionally increase process burden, related by-products are easy to remove and do not affect the environment and production safety.

The invention discloses a method for improving the catalytic SBS hydrogenation efficiency of a titanocene catalyst. The method comprises the following steps: obtaining a styrene / butadiene / styrene copolymer glue solution through an anionic polymerization method; carrying out hydrogenation reaction on the styrene / butadiene / styrene copolymer glue solution under the action of a siloxane cocatalyst, dicyclopentadiene titanium dichloride and lithium hydride to obtain a hydrogenated styrene / butadiene / styrene copolymer; by adopting the siloxane cocatalyst, the hydrogenation degree of the high-molecular-weight SBS can reach 98% or above, the problems of chromaticity and smell of the product can be solved, and in addition, a certain anti-sticking effect is achieved.