5results about How to "Reduce separation costs" patented technology

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 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 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.