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Method for making Fischer-Tropsch synthetic reaction stable
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A Fischer-Tropsch synthesis and reaction technology, which is used in the preparation of liquid hydrocarbon mixtures and in the petroleum industry. The effect of hydrothermal inactivation
Active Publication Date: 2014-12-03
CHINA PETROLEUM & CHEM CORP +1
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[0008] The purpose of this invention is to provide a kind of method that makes the Fischer-Tropsch synthesis reaction enter the steady-state stage smoothly from the initial stage of the reaction, to solve the technical problem that operating conditions are adjusted too much in the prior art, and the operating conditions are easily caused to fluctuate greatly
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Embodiment 1
[0041] Weigh 500g γ-Al 2 o 3 Carrier (product of Changling Catalyst Factory, particle size 16-26 mesh), the carrier was placed in a muffle furnace and calcined at 600° C. for 3 hours.
[0042] Weigh the above γ-Al 2 o 3 30 grams of carrier, 5.5 grams of cobaltnitrate was dissolved into 8.1 ml of solution, the solution was sprayed on the carrier by spraying method under agitation, then baked in an oven at 120°C for 4 hours, and then placed in a muffle furnace Calcining at 500° C. for 4 hours, repeating this operation twice to obtain Fischer-Tropsch synthesis catalyst A.
[0043] Fischer-Tropsch synthesis catalyst A is activated under pure hydrogen atmosphere, activation conditions: temperature 400°C, pressure 0.5MPa, gas hourly space velocity 500h -1 , time 24 hours.
[0044] After the catalyst is activated, when the temperature drops to 212 °C, first introduce N 2 Substitution is carried out until the H in the system 2 The mass fraction is 2 Volume fraction in the mixt...
Embodiment 2
[0052] Weigh 500g γ-Al 2 o 3 Carrier (product of Changling Catalyst Factory, particle size 16-26 mesh), the carrier was placed in a muffle furnace and calcined at 600° C. for 3 hours.
[0053] Weigh the above γ-Al 2 o 3 30 grams of carrier, 5.5 grams of cobaltnitrate was dissolved into 8.1 ml of solution, the solution was sprayed on the carrier by spraying method under agitation, then baked in an oven at 120°C for 4 hours, and then placed in a muffle furnace Roasting at 500° C. for 4 hours, and repeating this operation three times to obtain Fischer-Tropsch synthesis catalyst B.
[0054] Fischer-Tropsch synthesis catalyst B is activated under pure hydrogen atmosphere, activation conditions: temperature 400°C, pressure 0.5MPa, gas hourly space velocity 500h -1 , time 24 hours.
[0055] After Fischer-Tropsch synthesis catalyst B is activated, when the temperature drops to 218°C, first introduce N 2 Substitution is carried out until the H in the system 2The mass fraction i...
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Abstract
A method for making a Fischer-Tropsch synthetic reaction stable. A catalyst for Fischer-Tropsch synthesis is activated and enters an initial phase of a Fischer-Tropsch synthetic reaction; at the reaction initial phase, an inert medium is introduced into synthesis gas so as to allow a mixture flow containing hydrogen, carbon monoxide and the inert medium to contact with the Fischer-Tropsch synthesis catalyst bed layer for reaction; with the activity of the Fischer-Tropsch synthesis catalyst being in a steady state, the amount of the inert medium in the reactant flow is decreased gradually till the Fischer-Tropsch synthetic reaction is in a steady-state phase, wherein at the reaction initial phase, the reaction condition is the same as the reaction condition at the steady-state phase. With the method, the risk of overtemperature at the reaction initial phase is reduced; hot spot areas are reduced; the Fischer-Tropsch synthetic reaction can go into a steady-state phase stably; and guarantee for the long-period running of Fischer-Tropsch synthesis equipment is provided.
Description
technical field [0001] The invention relates to a Fischer-Tropsch synthesis method, more specifically, a method for making the Fischer-Tropsch synthesis reaction proceed smoothly. Background technique [0002] It is a good technology to replace petroleum by using carbon and hydrogen-containing resources such as natural gas, asphalt, coal, and biomass as raw materials to produce synthesis gas, and then to produce liquid hydrocarbons through Fischer-Tropsch synthesis using synthesis gas as raw material. [0003] Through the Fischer-Tropsch synthesis reaction, the synthesis gas composed of hydrogen and carbon monoxide can be converted into liquid hydrocarbons or solid hydrocarbons. Since the Fischer-Tropsch synthesis reaction is a strongly exothermic and temperature-sensitive reaction, in order to ensure the smooth operation of the Fischer-Tropsch synthesis reaction, the control of operating conditions such as temperature during the reaction process needs to be carefully operat...
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