11results about How to "Reduce separation costs" patented technology

The invention relates to a catalyst for preparing anisole through phenol methanol etherification as well as a preparation method and application of the catalyst. The catalyst takes aluminum phosphate as a carrier and is doped with zirconium oxide; on the basis of the mole number of Al, the mole ratio of P to Al is (0.05-2): 1, and the mole ratio of Zr to Al is (0.08-0.20): 1. Dropwise adding the aluminum-zirconium mixed aqueous solution into the phosphorus source aqueous solution, stirring, standing and washing to obtain a solid sample; and drying and roasting the solid sample to obtain the aluminum phosphate catalyst. Under the action of the catalyst, phenol and methanol are catalyzed to generate anisole. Compared with the prior art, the phenol conversion rate is greater than or equal to 50%, the anisole selectivity is greater than or equal to 85%, highly toxic dimethyl sulfate and a large amount of alkali are not needed, the process is green, the cost is low, separation is simple, and the method is suitable for large-scale industrial production of anisole.

The application provides a heat recovery method and device of a pyrolysis rotary furnace, and the heat recovery method comprises pyrolysis gas flow condensation: high-temperature pyrolysis gas flows out from a pyrolysis furnace, enters a high-temperature condenser after slag removal, is cooled by a light working medium, high-boiling-point pyrolysis oil components are condensed out, are collected and discharged into a high-boiling-point oil tank for storage, and meanwhile, medium-temperature pyrolysis gas is obtained; working medium circulation: the light working medium absorbs the heat of the high-temperature pyrolysis gas in the high-temperature condenser, evaporates water vapor and becomes a concentrated working medium which is discharged from the lower part of the condenser and returned to a medium absorber, during which, the concentrated and light liquid heat exchanger is used to transfer the heat of the working medium to the light working medium of the high-temperature condenser; the application of the mature technology is a derivative application of the absorption heat pump technology, the working principle is simple, the system route is safe, and the operation is stable.

The invention discloses a magnetic easy-to-separate Fe3O4-SnO-SiO2 composite catalyst and preparation and application thereof.The composite catalyst is of a core-middle layer-shell layer three-layer core-shell structure, a shell comprises a coating layer, the core comprises a magnetic core, the middle layer comprises an active layer, and the active layer is evenly adsorbed to the surface of the magnetic core; the magnetic core is Fe3O4; the active layer is any one or more than two of SnO, ZrO2 and TiO2; the coating layer is made of SiO2 and wraps the outer side of the active layer. The problems that efficient catalysis, convenient magnetic separation, long-acting circulation stability and precise regulation and control of a product structure cannot be synchronously solved in the prior art are solved. The conversion rate of the catalyst for catalytic synthesis of trimethylolpropane trioleate reaches 94.32%; the friction coefficient of the product is stabilized at 0.09-0.10, the wear volume is reduced by more than 68%, and the magnetic separation recovery rate is 98%.

The application provides a preparation method of a catalyst for preparing low-carbon olefins from synthesis gas, which comprises the following steps: mixing a soluble salt solution of a metal component with phosphoric acid, performing a precipitation reaction, and drying the obtained slurry; calcining the dried product at 300-500 DEG C for 1-24h to obtain solid grains with a diameter of 0.5-7nm; immersing the solid grains in a soluble salt solution of an auxiliary agent, reacting for 1-3h, then evaporating the reaction system, and transferring the obtained solid product to a calcination furnace at 350-650 DEG C for 1-8h to obtain a catalyst for preparing olefins from synthesis gas; the preparation method uses phosphoric acid as an essential auxiliary agent, effectively reduces the amount of the auxiliary agent, and saves the preparation cost of the catalyst; the stability of the phosphoric acid salt is high, the catalyst is not deactivated in a long operation, and the replacement cost of the catalyst is saved; the catalyst is used for preparing olefins, the content of C5+ products can be reduced by 50%-90%, and the proportion of C2-C4 olefins can be increased to 75%-88%. The economic efficiency of the product is improved, and the separation cost is reduced.

This invention relates to the field of catalysis, and discloses a bilayer gradient acidic core-shell molecular sieve catalyst, its preparation method, and its applications. The bilayer gradient acidic core-shell molecular sieve catalyst comprises a ZSM-11 core layer and a BEA shell layer covering its surface; the acid strength of the ZSM-11 core layer is 0.40–1.20 mmol / g, and its average thickness is 0.5–3 μm; the acid strength of the BEA shell layer is 0.10–0.40 mmol / g, and its average thickness is 20–300 nm. This catalyst possesses a bilayer gradient acidic core-shell structure. When applied to the catalytic synthesis of tert-butylamine from isobutylene or its precursors (alcohols / ethers), it can improve single-pass conversion while maintaining high selectivity, and significantly reduce the carbon deposition rate and bed pressure drop growth, achieving long-term stable operation.

The application provides a method for isolating branched sphingosine from Bacteroides fragilis, products and applications. The method comprises the following steps: (1) using an organic solvent as an extraction solvent to extract intracellular metabolites and obtain a total extract; (2) using an organic solvent as an extractant to extract the total extract to obtain an extract; (3) using a reverse phase chromatographic column to perform liquid chromatography separation on the extract to obtain the branched sphingosine; wherein the liquid chromatography separation conditions comprise elution with an acetonitrile / water solution containing formic acid as an elution system. The application can obtain a plurality of different high-purity active branched sphingosines from the fermentation broth of Bacteroides fragilis through simple treatment, and the method is simple to operate and does not require complex equipment and technology.

The invention discloses S, S-3, 6-octanediol and a preparation method thereof.The preparation method comprises the steps that 3, 6-octanedione serves as a raw material, a system with isopropanol as a reaction medium is established, and a product with S, S-3, 6-octanediol is obtained through a reaction of coenzyme and ketoreductase; the preparation method mainly comprises the following operation steps: raw material pretreatment, double-enzyme cascade coenzyme catalysis, by-product post-treatment and recovery, and product purification and crystallization. In the step of double-enzyme cascade coenzyme catalysis, ketoreductase and isopropanol dehydrogenase are adopted for concerted catalysis; 3, 6-octanedione is catalyzed by the ketoreductase to be reduced into S, S-3, 6-octanediol, and the S, S-3, 6-octanediol is converted into NAD < + > by means of NADH; the isopropanol dehydrogenase converts isopropanol into acetone and converts NAD < + > into NADH at the same time, so that regeneration of the coenzyme is realized. According to the preparation method disclosed by the invention, the process of S, S-3, 6-octylene glycol is simplified, meanwhile, the separation cost is reduced, and the purity and chiral purity of S, S-3, 6-octylene glycol are improved.

The invention discloses a copper-bismuth composite electrode material with a nanowire array structure, which comprises a foamy copper substrate and a copper-bismuth nanowire array layer deposited with a bismuth component, and the copper-bismuth nanowire array layer deposited with the bismuth component grows on the foamy copper substrate. The invention also discloses a preparation method of the material. The preparation method specifically comprises the following steps: step 1, preparing a sample; step 2, carrying out electroreduction treatment on the sample in an electrolyte to obtain a substrate loaded with a copper nanowire array; and step 3, preparing a bismuth-containing electro-deposition solution at room temperature, placing the copper nanowire array substrate in the step 2 in the bismuth-containing electro-deposition solution, loading a bismuth component on the copper nanowire array substrate in a constant-current electrochemical deposition mode, and after deposition is finished, performing immersion cleaning and drying to obtain the copper-bismuth composite electrode material with the nanowire array structure. According to the copper-bismuth composite electrode material with the nanowire array structure, provided by the invention, carbon dioxide can be reduced into formate with high selectivity, and the stability of an electrode is remarkably enhanced.

The invention discloses a cobalt-based catalyst and a preparation method and application thereof, the cobalt-based catalyst is obtained by at least taking a cobalt-based precursor and an organic nitrogen source as raw materials through in-situ carbonization treatment; wherein the raw materials of the cobalt-based precursor at least comprise a cobalt salt, a zinc salt and an imidazole organic ligand. The preparation method comprises the following steps: dissolving cobalt salt and zinc salt in water to obtain a metal salt aqueous solution; the preparation method comprises the following steps: dissolving an imidazole organic ligand in water to obtain an imidazole organic ligand aqueous solution; the preparation method comprises the following steps: mixing a metal salt aqueous solution and an imidazole organic ligand aqueous solution, heating, aging, collecting a solid product, washing and drying to obtain a catalyst precursor; and mixing the catalyst precursor with an organic nitrogen source, and carrying out in-situ carbonization treatment to obtain the catalyst. The cobalt-based catalyst shows excellent catalytic activity and selectivity in the methanol oxidative carbonylation reaction, has good reaction stability, can still keep high methanol conversion rate and DMC selectivity after being recycled for five times, and has good industrial application potential.

This invention specifically relates to a method for preparing γ-butyrolactone by hydrogenation of 1,4-butanediol coupled with dehydrogenation of succinic acid. This method couples the hydrogenation reaction of succinic acid with the dehydrogenation reaction of 1,4-butanediol to prepare γ-butyrolactone in high yield. The reaction process is simple, improves the heat and mass transfer efficiency of the catalyst surface, simplifies the operation steps, reduces energy consumption, and saves product separation costs. The highest yield of γ-butyrolactone can reach 99.9%, making it suitable for large-scale industrial production.

This invention relates to a method for separating a methyl methacrylate-methanol-water mixture using pressure swing distillation combined with extractive distillation. The apparatus for implementing this method mainly comprises the following parts: distillation column 1 (C1), distillation column 2 (C2), distillation column 3 (C3), condenser 1 (D1), condenser 2 (D2), condenser 3 (D3), reboiler 1 (B1), reboiler 2 (B2), reboiler 3 (B3), cooler (E1), mixer (FS), centrifugal pump 1 (P1), centrifugal pump 2 (P2), and centrifugal pump 3 (P3); wherein the bottom stream of distillation column 1 (C1) enters the distillation column... Distillation column 2 (C2) receives high-purity methanol from the top stream of distillation column 1 (C1). The bottom product of distillation column 1 (C1) passes through P1 and enters distillation column 2 (C2). High-purity methyl methacrylate is then received from the top stream of distillation column 2 (C2), and the bottom product of distillation column 2 (C2) passes through P2 and enters distillation column 3 (C3). High-purity water is then received from the top stream of distillation column 3 (C3), completing the separation of the three components. High-purity extractant is obtained from the bottom of distillation column 3 (C3) and passes through P3 into cooler (E1). After cooling, extractant is added and then refluxed back to distillation column 2 (C2). The extractant used is non-volatile, has good chemical and thermal stability, and is environmentally friendly and pollution-free.