62results about How to "Increase the degree of hydrogenation" patented technology

A wax composition is provided having high melt temperature, flexibility, pliability and chemical stability. The wax composition includes an acetylated wax including an acetylated glyceride and, optionally, a plant-based wax. The wax composition is useful for candle wicks, dental floss, candle bodies and other articles where these properties are advantageous.

A wax composition is provided having high melt temperature, flexibility, pliability and chemical stability. The wax composition includes an acetylated wax including an acetylated glyceride and, optionally, a plant-based wax. The wax composition is useful for candle wicks, dental floss, candle bodies and other articles where these properties are advantageous.

The invention relates to the technical field of hydrogenation of thermoplastic elastomers, and particularly discloses a homogeneous catalytic hydrogenation method for a styrene-isoprene-styrene triblock copolymer. The homogeneous catalytic hydrogenation method is characterized by comprising the following steps: adding a catalyst b solution into a catalyst a solution, and performing aging to obtaina hydrogenation catalyst; dissolving a triblock copolymer SIS into cyclohexane, and placing the mixed material into a hydrogenation reaction kettle, under stirring conditions performing vacuumizing and raising the temperature, adding the hydrogenation catalyst into the hydrogenation reaction kettle, filling the reaction kettle with a hydrogen gas, and performing a hydrogenation reaction; and performing cooling to a room temperature after the reaction is completed, taking out a hydrogenation glue liquid, adding hydrochloric acid dropwise into the glue liquid, performing flocculation with anhydrous ethanol, and performing vacuum drying to obtain the product. According to the method provided by the invention, the catalyst does not need to be specifically removed, the experimental operation is simple and easy to implement, the catalyst efficiency is improved, the usage amount of the catalyst is reduced, meanwhile, the thermoplastic elastomer SIS with a high molecular weight can be hydrogenated under a lower temperature, and the method has good hydrogenation selectivity.

The invention relates to the field of copolymers, and discloses a method for preparing polymers. The method includes steps of (1), mixing glue solution of unsaturated polymers and hydrogenation catalysts with one another; (2), sequentially carrying out first hydrogenation reaction and second hydrogenation reaction on mixtures obtained at the step (1) in the presence of hydrogen; (3), removing solvents in reaction products obtained at the step (2). The hydrogenation catalysts contain organic compounds of organic aluminum and metal of VIIIB groups. The reaction temperatures of the first hydrogenation reaction range from -10 DEG C to 15 DEG C, and the reaction temperatures of the second hydrogenation reaction range from 40 DEG C to 120 DEG C. The method for preparing the polymers has the advantages that the hydrogenation reaction activity of the hydrogenation catalysts and the hydrogenation degrees of hydrogenation products can be improved, and the method is easy to operate and implement, short in reaction time and low in preparation cost.

The invention provides a nitrile rubber selective heterogeneous hydrogenation catalyst and a preparation method and a hydrogenation method thereof. The nitrile rubber selective heterogeneous hydrogenation catalyst uses silicon dioxide hollow microspheres with rich big holes as carriers, and uses active metal M as carriers; through being metered by using the total quantity of the nitrile rubber selective heterogeneous hydrogenation catalyst as 100 weight percent, the load quantity of the active metal M is 1 weight percent to 8 weight percent; the active metal M comprises Pd or Rh. The catalyst is obtained by loading the active metal M onto the silicon dioxide hollow microspheres with rich big holes by a coupling grafting method. The method of the nitrile rubber selective heterogeneous hydrogenation completed by using the catalyst comprises the step of mixing the nitrile rubber selective heterogeneous hydrogenation catalyst and nitrile rubber. The invention also provides hydrogenation nitrile rubber obtained by the method. The nitrile rubber selective heterogeneous hydrogenation method completed by using the catalyst and provided by the invention has the advantages that the hydrogenation degree is high; the selectivity is 100 percent.

The invention provides a nano magnesium-based hydrogen storage material and a preparation method thereof. The nano magnesium-based hydrogen storage material is prepared from magnesium and a graphene loaded titanium dioxide and scandium trioxide catalyst. The preparation method of the nano magnesium-based hydrogen storage material comprises the following steps: a pretreatment step: mixing magnesiumpowder with graphene-loaded titanium dioxide and scandium trioxide catalyst powder according to the ratio in the nano magnesium-based hydrogen storage material to obtain mixed powder; a hydrogenationcombustion synthesis step: performing hydrogenation combustion synthesis on the mixed powder to obtain a magnesium-based hydrogen storage material; and a post-treatment step: carrying out ball milling on the magnesium-based hydrogen storage material to obtain the nano magnesium-based hydrogen storage material. The nano magnesium-based hydrogen storage material prepared by the method has the characteristics of high activity, high capacity and excellent hydrogen absorption and desorption performance.

The invention relates to the hydrogenation field of butyronitrile latex, and discloses a hydrogenation method of butyronitrile latex. The method includes steps of (1), mixing butyronitrile latex, hydrogenation catalyst and ligand; (2), orderly performing first hydrogenation reaction and second hydrogenation reaction on the mixture obtained in step (1) in the presence of hydrogen, wherein the reaction temperature of the first hydrogenation reaction is 0-30 DEG C, and the reaction temperature of the second first hydrogenation reaction is 50-180 DEG C; (3), removing solvent in the reaction product obtained in step (2). The method is applied to perform hydrogenation on the butyronitrile latex, improve the hydrogenation activity of the hydrogenation catalyst and hydrogenation degree of the hydrogenation product; the hydrogenation product is free from obvious gel growth by comparing with the nitrile rubber before the butyronitrile latex before hydrogenation; moreover, the hydrogenation method is simple in operation, short in reaction time, easy to practice, and low in hydrogenation cost.

The invention provides a method for preparing temperature-control hydrogenation catalyst and an application in chemigum hydrogenation. The method of the invention uses a metal catalyst having a formula of MaXmLb to realize the hydrogenation of butyronitrile latex and recycle noble metal by the following technical scheme, wherein M is rhodium, X is Cl and L is phosphine compound. The technical scheme comprises the steps of: adding chemigum, solvent, catalyst and trivalence phosphine compound into a reaction device, using a hydrogen substitution system, pressurizing to 0.5 to 5 Mpa, heating to 100 to 175 DEG C, keeping temperature for 3 to 24 hours, adding polyethylene glycol and n-heptane into the resultant of reaction after finishing reaction, stirring 30 min, standing, layering, and then taking out the chemigum solution on upper layer, wherein the solution on lower layer contains the separated catalyst. The method of the invention ensures the chemigum hydrogenation catalyst having a fine temperature-control separating effect and improves the hydrogenation effect of the catalyst so the hydrogenation degree of the prepared chemigum is higher.

The invention discloses a hybridized dendrimer-loaded bimetal metal nanoparticle catalyst as well as a preparation method and application thereof. The hybridized dendrimer-loaded bimetal metal nanoparticle catalyst is a compound using hybridized polypropyleneimine (PPI) as a carrier and ruthenium and rhodium as metal nanoparticles. The preparation method comprises the following steps: modifying a primary amine group at the periphery of integral-algebra polypropyleneimine by using fifteen-element triene nitrogen heterocycle (MAC) to synthesize a novel hybridized dendrimer loading fifteen-element triolefin large ring on the surface and having different-algebra PPI; and then by adopting a method of co-complexing-reducing with two kinds of metal ions and using GnPPI-M (n=2, 3, 4, 5) as a carrier, preparing Ru / Rh bimetal DTNs with different Ru / Rh proportions, and by using the Ru / Rh bimetal DTNs as a catalyst, performing catalytic hydrogenation on butadiene-acrylonitrile rubber. The catalyst prepared by adopting the preparation method has excellent catalytic activity and selectivity, and can be recycled.

The invention relates to a method for producing water-white hydrogenated rosin, which comprises the following steps: using light color refined rosin obtained after purifying the rosin as hydrogenation raw materials, using a solvent for preparing solution, carrying out catalytic hydrogenation, then, separating out the solvent through distillation, and obtaining the water-white hydrogenated rosin. When the method provided by the invention is adopted, the water-white hydrogenated rosin with light color (the Lovibond color number of the yellow color is 0.3 to 1.0, and the Lovibond color number of the red color is 0.2 to 0.3), low iodine value and low abietic acid content can be obtained. Compared with the water-white hydrogenated rosin produced by a traditional method, the water-white hydrogenated rosin produced by the method provided by the invention has the advantages of lighter color, higher hydrogenation degree, better stability and lower cost, and the application value of products can be improved when the water-white hydrogenated rosin is applied to aspects such as electronics, paint, bonding agents, dyestuff and the like.

The invention relates to a method for preparing hydrogenated natural rubber (HNR) using an emulsion process. The method comprises the following steps: performing hydrogenation modification on natural rubber in natural latex by adopting a hydrazine hydrate / hydrogen peroxide / boric acid catalytic system; and flocculating by using an aqueous solution of 2% CaCl2 and drying, thereby obtaining the HNR with different hydrogenation degrees. According to the catalytic system, NR main chain hydrogenation can be catalyzed in an emulsion state; the gel content and decomposition temperature can be increased along with the increase of the NR hydrogenation degree, and a glass-transition temperature is slightly increased; and the crosslinking density of vulcanized rubber is increased along with the increase of the hydrogenation degree. Therefore, after hydrogenation, the flexibility of the HNR is reduced, and the thermal stability is improved; and the hydrogenation degree is increased, and the crystallization capacity of the HNR is decreased. The hydrogenation of the NR is expected to improve the aging resistance of the rubber.

The invention discloses a method for normal-pressure hydrogenation of an unsaturated polymer using a magnetic nano ferroferric oxide catalyst. The method is characterized by comprising the following steps of: adding latex or glue solution of an unsaturated polymer into a reaction container, heating up to 30-90 DEG C, adding reducing agent hydrazine hydrate and the magnetic nano ferroferric oxide catalyst into a hydrogenation system, stirring for hydrogenation reaction under the condition of air, and preparing the hydrogenated polymer after reaction for 1-24h, wherein the unsaturated polymer system is nitrile latex or butyl benzene latex, or solution of nitrile rubber or solution of isoprene rubber. The method uses the nano ferroferric oxide catalyst in a solution hydrogenation system and an emulsion hydrogenation system of a macromolecular unsaturated polymer for the first time, and after the hydrogenation reaction is completed, nano ferroferric oxide is recycled through simple filtering and washed with deionized water for reuse, and redundant hydrazine hydrate is removed by generating nitrogen and water by-products so as to prepare a very pure hydrogenated product.