Sinopec Patente

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The present invention relates to a composite start-up catalyst, characterized in that, based on the dry basis weight of the composite start-up catalyst, the composite start-up catalyst comprises 15-95 wt% of Component A catalyst, which is selected from a deep catalytic cracking or catalytic cracking equilibrium catalyst and/or a deep catalytic cracking or catalytic cracking equilibrium catalyst after treatment, wherein the treatment includes demetallization treatment and/or particle diameter adjustment treatment, and 5-85 wt% of Component B catalyst, which is selected from one or more fresh deep catalytic cracking catalyst or catalytic cracking catalyst, and optionally Component C catalyst; said Component C catalyst contains 2-10 wt% of an oxide of a modifying metal. The present invention also relates to a method for preparing the above composite start-up catalyst, its use in the start-up of a deep catalytic cracking or catalytic cracking unit, and a start-up method for a deep catalytic cracking or catalytic cracking unit.

The present invention relates to the technical field of microorganisms, and in particular to an acid-resistant Kluyveromyces marxianus strain and the use thereof. The provided Kluyveromyces marxianus DLY-KMPMFF-0329 is deposited in the China General Microbiological Culture Collection Center with a deposit number of CGMCC No.27009. The strain can tolerate a high concentration of succinic acid and low pH conditions, can efficiently use glucose to synthesize succinic acid by means of the reductive tricarboxylic acid cycle pathway, and can achieve a relatively high production and yield of succinic acid. In addition, the strain has a relatively high homologous recombination efficiency, so that efficient gene editing can be achieved. The strain can be used not only as a succinic acid-producing strain for the fermentation production of succinic acid, but also as a starting strain for breeding or constructing a high-yield succinic acid-producing strain, and has a good application value.

The present disclosure relates to the field of cooling towers. Disclosed are a plume-abatement cooling tower and a plume-abatement packing unit thereof. The plume-abatement packing unit comprises a plurality of heat exchange sheets which are stacked, and dry cold airflow channels and wet hot airflow channels which are alternately distributed along a stacking direction and capable of realizing inter-wall heat exchange by means of the heat exchange sheets. The lower part of each heat exchange sheet is formed as an inverted trapezoidal structure, and adjacent heat exchange sheets are alternately sealed and connected at inclined edges on two sides of the inverted trapezoidal structure, so that dry cold airflow inlets in communication with the dry cold airflow channels and wet hot airflow inlets in communication with the wet hot airflow channels are alternatively formed on two opposite sides, and liquid collection outlets in communication with the wet hot airflow channels are formed at bottom short edges. Water collection and guide structures capable of guiding at least part of water carried in an airflow entering from the wet hot airflow inlets and/or generated by condensation of the airflow to the liquid collection outlets are formed on the sides of the heat exchange sheets facing the wet hot airflow channels. The plume-abatement packing unit can effectively improve the plume abatement effect.

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Disclosed in the present invention are a vanadium-based catalyst, and a preparation method therefor and the use thereof. The vanadium-based catalyst comprises a carrier and a vanadium-based active material loaded on the carrier, wherein the vanadium-based catalyst is of a strip-shaped structure having a multi-petal-shaped cross section, the number of petals in the multi-petal-shaped cross section is at least three, and there are at least two through holes in the strip-shaped structure in the direction of length thereof; and the shape factor of the vanadium-based catalyst is 70-110. The vanadium-based catalyst of the present invention can be used in a wet sulfuric acid process, and the catalyst is low in terms of filling amount, can achieve a relatively high SO<2> conversion rate and a relatively low bed pressure drop by means of a relatively low filling amount, is particularly applicable to the preparation of sulfuric acid by means of the cracking of waste acid in the case of a relatively high impurity content of a feed gas, and is greatly advantageous during long-period operation.

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The present disclosure is directed to a modified SCM-36 molecular sieve and a preparation method and use thereof. In the present disclosure, hydrogen-form SCM-36 is used to carry out sulfonate loading, obtaining a modified SCM-36-SO₃H molecular sieve, which has a schematic chemical composition represented by the formula "mSiO₂•nAl₂O₃•pSO₃H", wherein 22 ≤ m/n ≤ 80, and 10 ≤ m/p ≤ 160. In the biomass → HMF reaction, the use of modified SCM-36-SO₃H molecular sieve as a solid acid catalyst provides the method with the advantages of simple operation, high product selectivity, good catalyst stability, easy product separation, and easy catalyst recovery, achieving a green and efficient conversion of biomass to 5-hydroxymethylfurfural.

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The present invention relates to a technical field of new material, disclosing a carbon-carbon composite material and a preparation process and use thereof. The carbon-carbon composite material comprises a carbon fiber, a plurality of graphitized lamellae wrapping the carbon fiber, and non-carbon nanoparticles dispersed between the graphitized lamellae. The carbon-carbon composite material of the present invention comprises, on a microscopic scale, graphitized lamellae having a concentric circle structure. By means of this specific structure, the carbon fiber and the peripheral graphitized lamellae having the non-carbon nanoparticles dispersed therebetween, as well as the graphitized lamellae themselves, can be firmly bound, so that the obtained carbon-carbon composite material has better dimensional stability and electrical conductivity. Meanwhile, the carbon-carbon composite material of the present invention can have improved corrosion resistance, ablation resistance, temperature-resistance and sealing performance and/or electrochemical activity.

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A carbon fiber assembly, and a preparation method therefor and a use thereof. The carbon fiber assembly comprises a plurality of carbon fiber basic units which are arranged in a non-oriented manner, wherein the carbon fiber basic units comprise a carbon fiber bundle formed by a plurality of carbon fibers and optionally single carbon fibers; the carbon fiber bundle is a carbon fiber tow that is fixed together; at least one fixed node is arranged on the carbon fiber tow; taking the two ends of each carbon fiber in the length direction as carbon fiber ends, the number of carbon fiber ends contained in each gram of the carbon fiber assembly is greater than or equal to 1×10⁶ in terms of the number of carbon fiber ends. The carbon fiber assembly can be used for microwave heating pyrolysis of an organic material in a microwave field, and preparation of syngas using carbon dioxide in a microwave field; the organic material includes one or more of plastics, biomass, and volatile organic compounds.

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