A kind of catalyst preparation method for oxidative dehydrogenation of propane to produce propylene

A technology for oxidative dehydrogenation and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low metal utilization in carrier channels and accelerate deep oxidation of products , the contribution of the catalyst is not large, etc., to avoid further oxidation, improve the conversion rate and selectivity of propylene, and improve the effect of utilization

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The oxidative dehydrogenation of propane to propylene is still a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), and the reaction is completed when the reactants reach the outer surface of the catalyst, so the inner surface of the catalyst is relatively The target reaction does not contribute much, which results in lower metal utilization in the pores of the support, increases the cost of the catalyst, and also accelerates the deep oxidation of the product

Method used

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  • A kind of catalyst preparation method for oxidative dehydrogenation of propane to produce propylene
  • A kind of catalyst preparation method for oxidative dehydrogenation of propane to produce propylene

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Embodiment 1

[0035] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8 h, and the obtained catalyst was calcined at 450°C for 4 h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3 wt%, V: 2.5wt% %, Ni: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 g of the powder, add 260 mL of 98 wt% concentrated sulfuric acid, stir at 50 °C to dissolve the solid, and collect the filtrate by filtration , add 54.01g of nickel nitrate to the filtrate, stir to dissolve, add 27.31g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1), add 142.13g of pseudo-boehmite after all dissolved, at 70℃ Stir until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 h, and calcinate at 600°C for 4 h to obtain catalyst precursor A, wherein Mo accounts for 6 wt% of the weight of catal...

Embodiment 2

[0037] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8 h, and the obtained catalyst was calcined at 450°C for 4 h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3 wt%, V: 2.5wt% %, Ni: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 300 mL of a mixed solution of 98 wt% concentrated sulfuric acid and 65 wt% concentrated nitric acid, and the volume ratio is 2:1 , stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 54.01g of nickel nitrate to the filtrate, stir and dissolve, add 40.98g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1.5), all After dissolving, add 51.65 g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the resulting solid at 100°C for 8 h, an...

Embodiment 3

[0039] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8 h, and the obtained catalyst was calcined at 450°C for 4 h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3 wt%, V: 2.5wt% %, Ni: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 450 mL of a mixed solution of 35 wt% concentrated hydrochloric acid and 65 wt% concentrated nitric acid, and the volume ratio is 1:1 , stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 54.01g of nickel nitrate to the filtrate, stir and dissolve, then add 13.66g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 0.5), all After dissolving, add 447g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 ...

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Abstract

The invention relates to a method for preparing a catalyst for oxidative dehydrogenation of propane to produce propylene. The catalyst includes an active component, an auxiliary agent and a carrier. The method for preparing the catalyst comprises: treating a waste residue oil hydrogenation catalyst to prepare a catalyst precursor A; then use a reducing atmosphere to reduce the catalyst precursor A; add the reduced catalyst precursor A and polyol solution to the autoclave for hydrogenation reaction, place the reaction effluent and then filter and dry to obtain the catalyst Precursor B: Dissolving the active component precursor in water to obtain solution C, then adding catalyst precursor B, drying and roasting to obtain the catalyst. The method of the present invention not only makes full use of the waste residue oil hydrotreating catalyst, saves costs, but also promotes the dispersion of more active components on the surface of the carrier, which not only improves the utilization rate of active metals, but also improves the conversion rate of propane and propylene selectivity.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for oxidative dehydrogenation of propane to produce propylene, in particular to a method for preparing a supported vanadium-based catalyst for oxidative dehydrogenation of propane to produce propylene. Background technique [0002] Propylene is an extremely important organic chemical raw material, widely used in the production of a series of important chemical products such as polypropylene, polyacrylonitrile, phenol, oxo alcohol, propylene oxide, acrolein and acrylic acid. [0003] At present, propylene is mainly produced by catalytic cracking of petroleum and catalytic dehydrogenation of propane. The production process of propane catalytic dehydrogenation to propylene is controlled by thermodynamic equilibrium, the reaction conditions are harsh, and there are problems such as rapid deactivation of the catalyst due to carbon deposition. The oxidative dehydrogenation of propane is a new way to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887C07C11/06C07C5/48
CPCY02P20/52
Inventor 孙晓丹张舒冬张信伟刘继华
Owner CHINA PETROLEUM & CHEM CORP
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