6 results about "Cycloparaffins" patented technology

The invention relates to the technical field of biological aviation kerosene, and discloses a process for preparing biological aviation kerosene from waste grease. The method comprises the following steps: introducing waste oil into a hydrofining reactor, introducing hydrogen, carrying out a hydrodeoxygenation reaction under the catalysis of a hydrogenation catalyst, carrying out a reaction on the obtained hydrodeoxygenated oil in an isomerization pour point depressing reactor, and finally carrying out isomerization hot high-pressure separation treatment, isomerization cold high-pressure separation treatment and rectification tower segmentation to obtain the biological aviation kerosene. The specific surface area of a carbon matrix of the hydrogenation catalyst is large, the void structure is rich, a large number of Ni-Mo-P active catalytic centers can be exposed, precious metals such as platinum and ruthenium do not need to be added, the hydrodeoxygenation reaction efficiency of waste oil and fat is remarkably improved, the mass fraction of branched paraffin and cycloparaffin in biological aviation fuel is high, and the combustion performance is better.

This invention relates to the field of chemical hydrogen storage, and discloses a carbon-based catalyst, its preparation method and application, and a method for the dehydrogenation of methylcyclohexane. The catalyst comprises nitrogen (N), carbon (C), hydrogen (H), and platinum nanoparticles; the catalyst has the following properties: "Pt x C y N z H a The schematic chemical composition of the catalyst is shown in the figure, where z:a = 1.5~5; z:x = 5~50; z:y < 0.016; in the catalyst, nitrogen atoms are covalently bonded to at least two carbon atoms; nitrogen atoms are covalently bonded to hydrogen atoms; the carbon tetrachloride adsorption value (CTC) of the catalyst is ≥80%; in the XRD spectrum of the catalyst, the A of the Pt(111), (200), (220), (222) crystal plane diffraction peaks of the platinum nanoparticles is ≥85%, and A = (Pt(111) peak area) / (peak area of ​​Pt(111) + peak area of ​​Pt(200) + peak area of ​​Pt(220) + peak area of ​​Pt(222))) × 100%. This catalyst has good catalytic activity and low hydrogenolysis activity, making it particularly suitable for dehydrogenation reactions, such as the dehydrogenation reaction of alkyl-substituted cycloalkanes. It can effectively control the hydrogenolysis reaction during the dehydrogenation process and reduce the generation of by-products. It is especially suitable for the application of methylcyclohexane dehydrogenation reaction. After the dehydrogenation reaction, the conversion rate of methylcyclohexane is high, and the methane content in the product is <0.3wt%.

This invention provides a polycyclic aromatic compound, a material for organic devices, an organic electroluminescent element, a display device, and a lighting device. The polycyclic aromatic compound has a structure comprising one or more structural units represented by formula (1); typically, at least one of ring A, ring B, and ring C is a ring represented by formula (Het), and the others are substituted aryl rings, Y... 1 For B, X 1 and X 2 For >N-R, X 3 and X 4 For >O, >N-R, or >C(-Me) 2 R is a substituted or unsubstituted aryl group, and any two or three consecutive Zs are related to Y. 1 and X 1 and / or X 2 Directly bonded carbon atoms, with other Z atoms being N or C-R. Z R Z The aryl ring or heteroaryl ring in the structure may be condensed from at least one cycloalkane, and may be hydrogen or a substituent.

The invention provides a preparation method of a niobium-modified'metal / molecular sieve 'catalyst, which is characterized by comprising the following steps: grinding and mixing commercial hydrated niobium oxalate and a molecular sieve, and then roasting in a muffle furnace at 500 DEG C to prepare a yNb / molecular sieve (y = 1, 2, 5, 10, Nb wt%). Finally, Pt is loaded on the Nb / molecular sieve, and nitrate is removed through drying and roasting; after reduction, the xPt-yNb / molecular sieve (x = 0.5, 1, 2, Pt wt%) catalyst is prepared. After the Pt-Nb / molecular sieve catalyst prepared by the method is reduced, depolymerization and hydrogenolysis of C-O and Csp3-Csp3 bonds in lignin can be realized through a one-step process (directly taking lignin as a substrate for hydrogenolysis and depolymerization), and the activity of the catalyst is equivalent to that of a NbOx-based material with corresponding Pt loading capacity; and the molecular sieve-based catalyst is obviously superior to a molecular sieve-based catalyst with corresponding Pt loading capacity in a two-step process (lignin oil extraction-hydrogenolysis depolymerization). The catalytic material can significantly improve the yield of lignin conversion target products and monocyclic cycloalkanes. The material is high in specific surface area, low in energy consumption in the preparation process, environment-friendly, good in economical efficiency and suitable for industrial production.

This invention provides a fuel composition comprising 5 wt% to 50 wt% alcohol and 50 wt% to 95 wt% of renewable cycloparaffinic gasoline, wherein the renewable cycloparaffinic gasoline comprises at least 40 wt% cycloparaffins, from 15 wt% to 25 wt% of aromatics, and from 20 wt% to 30 wt% of paraffins, by weight of the cycloparaffinic gasoline. The gasoline fuel composition of the present invention exhibits reduced particulate exhaust emissions from a vehicle operated by a spark ignition internal combustion engine.

The invention discloses a novel N4-acyl substituted-2 '-deoxy-2'-fluoro-4 '-azido cytidine derivative and pharmaceutical application thereof, the novel N4-acyl substituted-2'-deoxy-2 '-fluoro-4'-azido cytidine derivative has a structure of a general formula (b): in the formula, R1 is H, F or CH3; r2 = H, N3 or C2H; and R3 is C0-C10 straight chain or branched chain saturated and unsaturated alkane, C6-C12 aromatic alkane or C3-C6 heterocyclic alkane. N4-acyl substituted-2 '-deoxy-2'-fluoro-4 '-azide cytidine derivatives are synthesized by modifying the 4-amino group of a compound a, and the compounds have anti-hepatitis B virus and anti-tumor activity; the preparation method is feasible; the compound has a good application prospect when being applied to drugs for treating viruses and tumors.