139 results about "Branched alkane" patented technology

The invention provides a high octane number gasoline pool comprises at least 2% of di-branched paraffins containing 7 carbon atoms, and a process for producing this gasoline pool by hydro-isomerizing a feed constituted by a C5 to C8 cut which comprises at least one hydro-isomerization section and at least one separation section, in which the hydro-isomerization section and at least one separation section, in which the hydro-isomerization section comprises at least one reactor. The separation section comprises at least one unit and produces at least two streams: a first stream which is rich in di- and tri-branched paraffins, and possibly in naphthenes and aromatic compounds which is sent to the gasoline pool; and in a first version of the process, a second stream is produced which is rich in straight-chain and mono-branched paraffins which is recycled to the inlet of the hydro-isomerization section, while in a second version of the process, a second flux is produced which is rich in straight-chain paraffins which is recycled to the inlet of a first hydro-isomerization section and a third stream is produced which is rich in mono-branched paraffins which is recycled to the inlet of a second hydroisomerization section.

The invention discloses a preparation method for a mesoporous-microporous composite hydroisomerization dewaxing catalyst. The invention relates to a mesoporous-microporous composite molecular sieve. The composite molecular sieve with a core-shell structure is formed by compounding with microporous ZSM-23 as a core and a mesoporous molecular sieve MCM-41 or SBA-15 as a shell in a manner of eutecticuming, wherein internal and external proportions and acidity of the molecular sieve are adjustable. The hydroisomerization dewaxing catalyst prepared by using the composite molecular sieve with the core-shell structure as a carrier through an excessive impregnation method has moderate acidity, can adjust the relative content of the composite molecular sieve in the catalyst according to the needs for acidity, has high noble metal dispersity, and is especially applicable to hydroisomerization reactions of long-chain n-alkanes and raw materials with high wax content. The obtained lubricant base oil has low pour point and high yield, and shows high isomerization reaction activity and selectivity, wherein the isomeric selectivity is larger than 93% on the premise that the conversion rate is 97%, and especially, the isomeric selectivity of multi-branched alkanes is significantly increased and is larger than 58%. The preparation method provided by the invention has the advantages of simple operation and good reproducibility.

The present invention provides a process for producing copper nanoparticles, comprising steps of: a) reacting an aqueous solution containing a reductant with an aqueous solution of a copper salt while stirring for 1-8 min, wherein the reductant being one or more selected from a group consisting of hydrazine hydrate, sodium borohydride and sodium hypophosphite; b) adding an apolar organic solution containing the extracting agent and continuing the stirring for 0.5-1.5 hrs, said extracting agent being one or more selected from the group consisting of alkyl dithiocarbonic acid and salts thereof, O,O′-dialkyl dithiophosphoric acid and salts thereof, and dialkylamino dithioformic acid and salts and said apolar organic solution being one selected from the group consisting of benzene, toluene and straight or branched alkanes having 6-12 carbon atoms, wherein the alkyl having 6-20 carbon atoms; and c) post-treating the reaction product to obtain copper nanoparticles.

Isomerization of a feedstream comprising C₅ to C₆ hydrocarbons involving charging hydrogen and the feedstream into an isomerization zone to contact an isomerization catalyst at isomerization conditions and increase the branching of the feedstream hydrocarbons to produce an isomerization effluent stream has been discovered. Without passing through a stabilizer, the isomerization effluent is passed through a product separator and a flash drum and then to an adsorptive separation zone to generate a raffinate stream enriched in branched alkanes, an extract stream enriched in normal alkanes, and at least one light ends stream. Within the adsorptive separation zone, the raffinate and the extract streams are each passed through a fractionator remove light ends and desorbent. The desorbent is recycled to the adsorptive separation zone. The remainder of the extract stream is recycled to the isomerization zone and the remainder of the raffinate stream is collected.

The invention discloses a C7-C10 n-alkane isomerization catalyst which comprises a composite carrier and 0.05-3.0% of platinum by mass based on carrier, wherein the composite carrier comprises 20-70% of MCM-41 molecular sieve by mass, 10-35% of phosphotungstic acid by mass and 10-50% of aluminum oxide by mass. The catalyst is used for the isomerization reaction of the C7-C10 n-alkane, and has relatively high isomerization activity, high product liquid yield and relatively high selectivity of highly branched alkane.

The invention relates to a water-free oil-based composition which is liquid at 20° C./normal pressure and which contains (a) 2 to 90% by weight of at least one linear and/or branched dialkyl carbonate and (b) 2 to 95% by weight of at least one linear and/or branched alkane containing 8 to 40 carbon atoms and to its use in the cosmetics field.

The invention relates to a straight-chain lightweight alkane isomerization catalyst, and a preparation method and an application thereof. The catalyst comprises a composite macroporous alumina carrier and 0.01-2.0% of platinum by mass calculated with the carrier as a reference. The composite macroporous alumina carrier comprises, by mass, calculated with the carrier as a reference, 5-45% of aluminum sol, 50-90% of macroporous alumina, and hydrochloric acid added according to a mass ratio of Al2O3 in the macroporous alumina to HCl of 15-200; kneading, strip extrusion forming and drying are carried out, and the material is roasted for 0.5-6h under a temperature of 400-700 DEG C; the material is then impregnated for 1-30h by using chloroplatinic acid according to a platinum load; the material is dried, and is roasted for 0.5-6h under a temperature of 400-700 DEG C, such that the catalyst is prepared. An Al/Cl molar ratio of the aluminum sol is 0.9-1.4. The volume of the macroporous alumina is 1.0-1.8ml/g. The catalyst is suitable for a straight-chain lightweight alkane isomerization reaction, and has good mechanical strength and catalytic activity. The catalyst has the advantages of high product liquid yield and high multi-branched alkane selectivity. The catalyst can be used for improving light hydrocarbon component octane number.

The invention provides a catalyst used for isomeric pour point depression of middle distillate in F-T synthesis and a special core-shell structure composite molecular sieve of the catalyst. The composite molecular sieve takes a microporous ZSM-22 molecular sieve as a core and takes a mesoporous MCM-41 molecular sieve as a shell, wherein a relative proportion of the microporous ZSM-22 molecular sieve to the mesoporous MCM-41 molecular sieve is adjustable. A preparation method for the composite molecular sieve comprises the steps of: firstly, preparing the ZSM-22 molecular sieve; then, adding alkaline and an organic template agent into a mixed system containing the ZSM-22 molecular sieve for pre-crystallization; and regulating the pH value to 6.5-13.5, and carrying out crystallization treatment, thereby obtaining the composite molecular sieve. The catalyst, which is prepared by taking the core-shell structure ZSM-22/MCM-41 composite molecular sieve as a carrier, is applied to hydroisomerization reaction of the middle distillate in F-T synthesis, and shows high isomeric selectivity; and especially, highly branched alkane selectivity is obviously improved. In the case that the conversion rate is 91.4%, the isomeric selectivity is kept to be higher than 90%, and the highly branched isomeric selectivity reaches 55.6%.

The invention relates to a preparation method of branched paraffin in a range of gasoline, aviation kerosene or diesel. The preparation method mainly comprises two parts: (1) carrying out self-condensation reaction on a biomass ABE fermentation product on a first catalyst bed layer of a fixed bed continuous reactor under the catalysis of an acid/alkali catalyst or metal doped solid alkali, so as to obtain a C6-C21 oxygen-containing organic compound; and (2) further carrying out hydrodeoxygenation reaction on a product of the first fixed bed continuous reactor on a second fixed bed continuous reactor at a relatively low temperature and a solvent-free condition under the catalysis of a metal-loaded A/X type bifunctional catalyst, so as to obtain C6-C21 branched paraffin in the range of gasoline, aviation kerosene or diesel. The branched paraffin, namely a liquid fuel can be used as a potential substitute of existing gasoline, aviation kerosene or diesel.

The invention relates to a preparation method for branched alkanes in a range of gasoline and aviation kerosene and biomass-based fatty alcohols. The method comprises the following two parts: (1) on afirst catalyst bed layer of a fixed-bed continuous reactor, methyl isobutyl ketone is subjected to a self-condensation reaction under catalysis of an acid catalyst, a base catalyst, a metal-doped solid acid catalyst, or a metal-doped solid base catalyst, so that an oxygen-containing organic compound with a carbon atom number of 12 is obtained; and (2) on a second catalyst bed layer of the fixed-bed continuous reactor, the generated product of the first catalyst bed layer and un-reacted raw materials are subjected to a one-step hydrodeoxygenation reaction under catalysis of a supported metal A/X-type bifunctional catalyst and conditions of a relatively high temperature and no solvents, and therefore the branched alkanes with carbon atom number of 6 and 12 in the range of the gasoline and the aviation kerosene are obtained. According to the invention, the saturated alcohols with a carbon atom number of 6 can be used as mineral flotation agents, and the saturated alcohols with a carbon atom number of 12 can be used for synthesis of biomass-based surfactants and the like.

The invention belongs to the technical field of UV photocatalytic chemistry and discloses unsaturated vegetable oil alkylates based on UV photocatalytic reaction and a preparation method thereof. The alkylates have one of structures shown in following formulas (1) and (2), wherein R1 is C-C4 linear or branched alkane groups, R2 is at least one of -H, -Cl, -CH3, -OH, -OCH3, -C(CH3)3 and the like, n is equal 0 or 1, m is greater than 1, with 6<l+m+s+t<16, and R3 is at least one of -OH, -CH3, -COOH and the like, with a=1 or 2, 0<b<6, c=0 or 1 and d=0 or 1. Analogs with urushiol structure are synthesized by using UV photo-initiated vegetable oil acylation, reaction conditions are mild, reaction time is short, and various vegetable oil acrylates can be acquired without the conditions such as high temperature and high pressure.

The present invention discloses a catalytic system for preparing highly branched alkane from olefin, which contains novel nickel or palladium complexes. In the presence of the catalytic system, highly branched oily alkane mixture can be efficiently obtained from olefins (such as ethylene) under mild conditions. The alkane mixture has a low bromine number, and can be used as a processing aid(s) and lubricant base oil with high-performance. Provides also was a method for preparing the catalyst and a method for preparing an oily olefin polymer.

The present invention provides methods for preparing a C₆-C₁₀ alkane, and mixture thereof. The methods include forming a reaction mixture containing an angelica lactone dimer, a catalyst, and a hydrogen source under conditions sufficient to reduce the angelica lactone dimer, thereby preparing the alkane. The methods can be used to prepare branched alkanes useful for fuels. Methods for preparing an angelica lactone, methods for preparing an angelica lactone dimer, and methods for reducing a lactone to an alkane are also described.

The invention relates to an electrolyte additive, an application thereof and a non-aqueous electrolyte containing the additive. The electrolyte additive contains an unsaturated cyclic phosphate compound. The unsaturated cyclic phosphate compound is selected from at least one of compounds with a structure as shown in a formula I, wherein R is respectively selected from C1-C5 straight-chain or branched-chain alkane, C1-C10 straight-chain or branched-chain unsaturated alkyl (including alkylene, alkyne and aryl), or alkyl containing C1-C5 straight-chain or branched-chain substituted by halogen. According to the electrolyte additive and the electrolyte using the additive provided by the invention, the electrolyte can solve the main problems faced by a lithium ion battery when the lithium ion battery is used under an extreme condition, and the high-temperature cycle performance and the high-temperature storage performance of the battery are remarkably improved.

The invention relates to a production method of a bright stock with low pour point and high viscosity. Naphthenic light deasphalted oil (pour point greater than or equal to 0 DEG C and 100 DEG C kinematic viscosity greater than or equal to 60 mm<2> / s) is used as a raw material, hydroisomerization technology is employed to isomerize the alkane molecules with high pour point in crude oil or cycloalkane with long side chain alkane into branched alkane with low pour point or cycloalkane with branched alkanes, and lubricating oil fraction in the crude oil is maintained, so as to reach the purposes of yield increase of bright stock with low pour point ( no more than -18 DEG C) and high viscosity (100 DEG C kinematic viscosity no less than 28 mm<2> / s) and combined production of high-quality naphtha and cleaning intermediate distillate oil. The invention has the characteristics of flexible device operation, high yield of bright stock, low pour point, high viscosity and high viscosity index.

The invention provides a preparation method of branched alkane, and belongs to the technical field of organic synthesis. The preparation method of the branched alkane comprises the following steps: mixing pinacolone, an alkyl metal reagent and an organic solvent under the condition of a protective atmosphere, performing an alkylation reaction so as to obtain an alkyl alcohol intermediate, mixing the alkyl alcohol intermediate, alkyl silane, an acid catalyst and an organic solvent under the condition of a protective atmosphere, and then performing an elimination reduction reaction so as to obtain the branched alkane. Pinacolone is adopted as a raw material, the alkyl metal reagent is applied to the alkylation reaction so as to obtain the corresponding alkyl alcohol intermediate, the alkyl silane is adopted as a reducing agent of the alkyl alcohol intermediate, and the elimination reduction reaction is performed in the presence of the acid catalyst so as to synthesize the branched alkane. The method has a simple synthesis route, high yield of branched alkane, high purity, no use of expensive catalysts, low raw material cost and simple operation, and is suitable for scale-up and industrial production.

The invention relates to a method for the epoxidation of an olefinic compound, which is characterised in that it comprises an oxidation reaction of at least one olefinic compound containing one or more double bonds C═C with oxygen in the presence of one or more reaction initiating agents, at least one catalyst containing at least one metal that is selected from a noble metal, a transition metal and mixtures of same, and at least one hydrocarbon that is selected from one or more branched alkanes, one or more alkyl cyclic or cyclic hydrocarbons, one or more alkyl aromatic or aromatic compounds and mixtures of same.