71 results about "Higher alkanes" patented technology

Nucleic acids encoding cytochrome P450 variants are provided. The cytochrome P450 variants of have a higher alkane-oxidation capability, alkene-oxidation capability, and / or a higher organic-solvent resistance than the corresponding wild-type or parent cytochrome P450 enzyme. A preferred wild-type cytochrome P450 is cytochrome P450 BM-3. Preferred cytochrome P450 variants include those having an improved capability to hydroxylate alkanes and epoxidate alkenes comprising less than 8 carbons, and have amino acid substitutions corresponding to V78A, H236Q, and E252G of cytochrome P450 BM-3. Preferred cytochrome P450 variants also include those having an improved hydroxylation activity in solutions comprising co-solvents such as DMSO and THF, and have amino acid substitutions corresponding to T235A, R471A, E494K, and S1024E of cytochrome P450 BM-3.

High octane C7 hydrocarbons, particularly 2,2,3-trimethylbutane (“triptane”) and 2,2,3-trimethyl-but-1-ene (“triptene”) (collectively “triptyls”) are produced by homologation of a feed comprising dimethyl ether and / or methanol and optionally including one or more aliphatic hydrocarbons in the presence of certain acidic zeolite catalysts. The process can be carried out at temperatures lower than those previously used for conversion of dimethyl ether and / or methanol to higher alkanes, including C7 alkanes, and results in selective production of triptane and / or triptene with relatively little isomerization to or production of other C7 alkanes.

The invention relates to a method used for extracting cembrenediols from tobacco inflorescence. The method comprises following steps: 1, an organic solvent is adopted to extraction and condensation so as to obtain a tobacco flower surface glandular hair secreta crude extract; 2, the crude extract is subjected to solvent precipitation so as to remove higher alkanes, and pigments are removed with active carbon so as to obtain a tobacco diterpene extract product, wherein the tobacco diterpene extract product possesses broad-spectrum inhibition effect on plant pathogenic fungi, and especially excellent inhibition effect on apple rot; 3, the tobacco diterpene extract product is subjected to silica gel column chromatography successively so as to obtain two main diterpene compounds alpha-4,8,13-cembratriene-1,3-diol, and beta-4,8,13-cembratriene-1,3-diol with antitumor activity, neuroprotective agent activity, and bacteriostatic activity. Waste tobacco inflorescence is taken as the raw material, so that utilization of waste resources is realized; extraction step is simplified greatly, and cost is reduced; and product yield and purity are high.

The invention discloses a method for preparing easily-machined polyether type thermoplastic polyurethane elastomer (TPU). The method comprises the following steps: 1) adding polyether polyhydric alcohol, an antioxidant and a catalyst into a reaction kettle for fusion, mixing and dehydration for later use; 2) respectively filling three components, namely, the polyether polyhydric alcohol, a dihydric alcohol chain extender and diisocyanate into a double-screw rod extruder for reaction through a high-precision gear pump; and 3) respectively adding solid higher alkane wax and higher fatty amine into the double-screw rod extruder by using a high-precision loss-in-weight in the middle of the double-screw rod extruder, fusing and mixing with polyurethane elastomer melt, and chopping under water to obtain easily-machined polyether type thermoplastic polyurethane elastomer grains. By adopting the method disclosed by the invention, the drying requirement is lowered (a dehumidification drying machine is not needed) when the easily-machined polyether type thermoplastic polyurethane elastomer is subjected to extrusion machining, and the surface smoothness degree of the product and the product extrusion stability are improved.

Embodiments of the present invention are directed to apparatus and methods for converting carbon dioxide and / or methane into higher alkanes and hydrogen gas in a single reaction chamber using a catalyst and microwave radiation.

The invention provides a VOC absorbent. The VOC absorbent is prepared from 3%-8% of Tween or Span, 20%-30% of a material A and the balance water. The material A is one of or a combination of triisopropylbenzene, biphenyl and high alkane. The invention further provides a processing method of VOC in the air. The method comprises the steps that the components are mixed to form microemulsion, the air containing VOC is introduced into the microemulsion in a concentrated mode and introduced out through an air outlet pipe, and outlet air is purified air which can be directly discharged into the interior. Accordingly, VOC in the air can be effectively removed, the method is simple, and use is convenient.

Disclosed is a process for the catalytic dehydrogenation of alkanes so as to form the corresponding olefins. The reaction mixture is subjected to membrane separation of hydrogen, in a separate unit. Preferably a plurality of alternating reaction and separation units is used. The process of the invention serves the purpose of reducing coke formation on the catalyst, and also of achieving a higher alkane conversion without a similar increase in coke formation. The process can also be used for the production of hydrogen.

The present invention provides a process for the production of a mixture of alcohols and ketones by the liquid phase oxidation of higher alkanes using a catalyst system consisting of transition group metal such as palladium and support such as alumina, silica, carbon, preferably carbon in the presence of alkyl hydroperoxide as oxygen carrier, under stirring conditions at a temperature range of 10°-120° C. and at atmospheric pressure in a stirred glass reactor for a period of 1-30 h. The present invention produces a mixture of alcohols and ketones with high selectivity (preferably 60-90%) along with other byproducts such as diketones and acids.

The invention relates to a catalyst for converting methyl isobutyl ketone into 2-methylpentane and a preparation method of the catalyst. The catalyst is prepared from two parts, namely a sulfonic-acid-functional metal organic framework material MIL-101 (Al) and precious metal Pt, wherein the weight of the metal Pt is 0.5-5 weight percent in total weight percentage of the catalyst. The preparation method comprises the following steps: adding sodium fluoride into mixed liquor of aluminum nitrate nonahydrate, 2-sulfonic acid terephthalic acid monosodium salt and deionized water; after crystallization, using a hydrochloric acid solution for ion exchange; washing and drying to obtain the sulfonic-acid-functional metal organic framework material MIL-101 (Al); then dropwise adding a K2PtC16 solution to obtain a catalyst precursor, and reducing the catalyst precursor through hydrogen to obtain the catalyst. The catalyst has high catalytic activity and high alkane selectivity when being used for converting methyl isobutyl ketone into 2-methylpentane.

A method of converting C2 and / or higher alkanes to olefins by contacting a feedstock containing C2 and / or higher alkanes with a first surface of a metal composite membrane of a sintered homogenous mixture of an Al oxide or stabilized or partially stabilized Zr oxide ceramic powder and a metal powder of one or more of Pd, Nb, V, Zr, Ta and / or alloys or mixtures thereof. The alkanes dehydrogenate to olefins by contact with the first surface with substantially only atomic hydrogen from the dehydrogenation of the alkanes passing through the metal composite membrane. Apparatus for effecting the conversion and separation is also disclosed.

A method of converting C2 and / or higher alkanes to olefins by contacting a feedstock containing C2 and / or higher alkanes with a first surface of a metal composite membrane of a sintered homogenous mixture of an Al oxide or stabilized or partially stabilized Zr oxide ceramic powder and a metal powder of one or more of Pd, Nb, V, Zr, Ta and / or alloys or mixtures thereof. The alkanes dehydrogenate to olefins by contact with the first surface with substantially only atomic hydrogen from the dehydrogenation of the alkanes passing through the metal composite membrane. Apparatus for effecting the conversion and separation is also disclosed.

The invention relates to a liquid acid alkylation reactor and an alkylation reaction method. The reactor comprises a liquid acid inlet (1), a hydrocarbon inlet (2), a hydrocarbon feeding distributor (3), a mixed reaction zone and an acid hydrocarbon outlet (5), wherein the hydrocarbon inlet and the liquid acid inlet are positioned above the mixed reaction zone, the acid hydrocarbon outlet (5) is positioned below the mixed reaction zone, the hydrocarbon feeding distributor comprises a radial distribution part and an axial distribution part, the radial distribution part and the axial distribution part are communicated with each other, the pipeline extending directions of the radial distribution part and the axial distribution part are perpendicular to each other, the radial distribution partis arranged above the mixing reaction zone, the raw material inlet of the radial distribution part is communicated with the hydrocarbon inlet, the axial distribution part comprises a feeding verticalpipe (3.3), the top end of the feeding vertical pipe is communicated with the radial distribution part, the bottom end of the feeding vertical pipe is a free end, the bottom end of the feeding vertical pipe extends into the mixing reaction zone in the axial direction of the reactor, and a plurality of distribution holes (3.4) are formed in the pipe wall of the feeding vertical pipe at intervals in the axial direction. According to the alkylation reactor, in-situ multi-section feeding can be achieved so as to ensure high alkane-olefin ratio.