5 results about "Higher alkanes" patented technology

The invention relates to a low-carbon alkane dehydrogenation olefin preparation catalyst, which comprises an alumina carrier and an active component, and is characterized in that the alumina carrier is a millimeter-scale sulfur-containing theta-alumina pellet, the particle size is 1.6-2.5 mm, the specific surface area is 80-150m < 2 > / g, the pore volume is 0.40-0.75 mL / g, the crushing strength is greater than 50N / pellet, the bulk density is 0.55-0.80 g / mL, the length-diameter ratio b / l value is more than 0.95, and the sulfur content is 0.05-0.50%. The theta-alumina pellets are prepared by the following steps: adding an acid solution into an alumina suspension of at least two kinds of hydrated alumina, wherein the acid peptizing index DI of at least one kind of hydrated alumina is 50-85%, peptizing to obtain alumina sol, then dropwise adding the alumina sol into an oil ammonia column through a dropper, pelletizing, drying and roasting. When the catalyst is used for an alkane dehydrogenation reaction, the alkane conversion rate and olefin selectivity are high, and the carbon deposition resistance is strong.

The invention relates to a molecular sieve morphology regulation and control preparation technology, and aims to provide a method for synthesizing a nanosheet ZSM-23 zeolite molecular sieve by using a double quaternary ammonium base organic template agent. Comprising the following steps: mixing water, a silicon source, an aluminum source, an alkali source and a biquaternary ammonium base organic template agent solution which are used as reaction raw materials, and uniformly stirring to obtain a gel mixture; transferring the gelatinous mixture into a reaction kettle for dynamic crystallization reaction, and centrifuging, washing and drying a reaction product to obtain the zeolite molecular sieve. The molecular structural formula of the bis-quaternary ammonium base organic template agent is shown as a formula I in the specification. According to the invention, the rigid framework is utilized to determine the structure and the flexible tail end adapts to and stabilizes the characteristics of the structure, so that the template agent with higher guiding efficiency is obtained; the molecular sieve synthesized by a hydrothermal single-template method is of a nanoscale sheet structure, has higher alkane conversion rate, monoisomer selectivity and yield, shows better mass transfer efficiency, and is very suitable for long-chain alkane isomerization reaction.

This invention discloses a reactive phase change material composition and its applications. The reactive phase change material composition comprises a higher alkane-based solid-liquid phase change material, an isocyanate, and a long-chain compound, wherein the long-chain compound is a long-chain alcohol and / or a long-chain amine. The reactive phase change material composition provided by this invention can be heated and melted at a relatively low temperature near the phase change temperature, generating a solid-gel phase change material in situ. This avoids the occurrence and leakage of liquid phase change materials and eliminates the cumbersome steps of multi-step purification of small molecule gelling agents. Furthermore, after melting into a liquid state, this reactive phase change material composition can be directly used for the synthesis and re-reaction of phase change emulsions, phase change composite materials, and phase change fibers. During processing, in-situ gelation and solidification are completed to form a solid-gel phase change material, thus avoiding the high temperatures required for heating and liquefying solid-gel phase change materials and a series of problems caused by high temperatures.

This invention relates to the technical field of photocatalytic carbon chain lengthening, and more particularly to a method for photocatalytic decarboxylation coupling of saturated chain carboxylic acids. Saturated chain carboxylic acids, a photocatalyst, and a solvent are added to a photocatalytic reactor. After replacing the atmosphere in the reactor with an inert gas, the reactor is sealed and stirred until homogeneous. The decarboxylation coupling reaction occurs at 10-40°C under external light irradiation for 1-10 hours. The mass ratio of saturated chain carboxylic acid to solvent is 1:1-50, and the mass ratio of saturated chain carboxylic acid to photocatalyst is 10-100:1. Compared with existing processes, this method has the advantages of low catalyst cost, low energy consumption, fast reaction rate, high selectivity, and no hydrogen consumption. This invention provides a new approach for carboxylic acid cross-coupling reactions and the production of higher alkanes from biomass fatty acids.

The invention relates to a method for preparing olefin from low-carbon alkane, which is characterized in that the low-carbon alkane is contacted with a catalyst comprising an alumina carrier and an active component to carry out dehydrogenation reaction, the preparation method comprises the following steps: adding an acid solution into a turbid liquid of at least two kinds of hydrated alumina, of which the acid peptizing index DI of at least one kind of hydrated alumina is 50-85%, for peptizing to obtain alumina sol, then dropwise adding the alumina sol into an oil ammonia column through a water dropper, balling, drying and roasting to obtain the catalyst, the particle size of the catalyst is 1.6-2.5 mm, the specific surface area is 80-150m < 2 > / g, the pore volume is 0.40-0.75 mL / g, and the pore volume is 0.20-0.75 mL / g. The crushing strength is more than 50N / grain, the bulk density is 0.55-0.80 g / mL, the length-diameter ratio b / l value is more than 0.95, and the sulfur content is 0.05-0.50%. The method is high in alkane conversion rate and olefin selectivity, and the catalyst is high in carbon deposition resistance.