Production of aromatics from methane
A technology for methane and aromatics, applied in the direction of products, catalyst regeneration/reactivation, condensation hydrocarbon production with dehydrogenated hydrocarbons, etc.
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[0022] figure 1 is a schematic diagram of a process for converting methane into higher hydrocarbons according to a first embodiment of the present invention.
[0023] figure 2 is a schematic diagram of a process for converting methane into higher hydrocarbons according to a second embodiment of the present invention.
[0024] image 3 is a graph of methane production rate versus temperature in the coked Mo / ZSM-5 catalyst of temperature programmed hydrogen treatment Example 6 in a plug flow reactor at a temperature ramp rate of 5°C / min.
[0025] Figure 4 is a graph of coke concentration (wt %) as a function of regeneration time in the Mo / ZSM-5 catalyst coked in hydrogen regeneration Example 7 at 850°C and various hydrogen partial pressures.
[0026] Figures 5a and 5b show the methane conversion (%) and benzene+toluene selectivity when the regeneration temperature was increased from 875°C to 925°C.
[0027] Detailed description of the implementation
[0028] The term "hi...
Embodiment 1
[0148] Example 1 illustrates the use of co-feedstocks (such as hydrogen, carbon dioxide, and water) in order to achieve a reduced coking rate over Mo / ZSM-5 catalysts during the dehydrocyclization of methane, primarily to benzene. Example 2 demonstrates that by reducing the amount of coke deposited on the catalyst during the on-oil period, high performance can be maintained after multiple on-oil and regeneration cycles, and that lower single-cycle coking rates mean resulting in a lower net coke deposition rate over multiple cycles.
[0149] Two methods were used to prepare the Mo / ZSM-5 catalyst: (1) by means of incipient wetness, in NH 4 + -ZSM-5 carrier (its Si / Al 2The ratio is 25) to impregnate the required amount of ammonium heptamolybdate (ammonium heptamolybdate) solution, followed by drying at 120°C for 2 hours, and finally calcining at 500°C for 6 hours in flowing air; and (2) ball milling Molybdenum oxide and NH 4 + -ZSM-5 carrier (its Si / Al 2 The ratio is 25) for...
Embodiment 2
[0153] The Mo / ZSM-5 catalyst was prepared by testing the method described in Example 1 above. As-synthesized catalysts were subjected to cyclic aging consisting of (1) where at 800°C and 14.7 psia (101 kPaa) with the specified co-feedstock, at the specified WHSV based on methane , the catalyst was exposed to methane feedstock for a 5 minute run period, followed by (2) where the catalyst was heated to 850°C and 14.7 psia (101 kPaa) at 10C / min under hydrogen and at 9000cc[STP] / g The regeneration period is held at 850°C for the specified time at the GHSV of catalyst / hr. After completion of the regeneration step, the catalyst was cooled to 800°C before reinjecting the methane feedstock. Prior to cycle aging, the as-synthesized catalysts were precarburized by heating the catalysts from 150°C to 800°C at 5C / min in a gas mixture of 15% methane-hydrogen and holding at 800°C for 1 hour. After the catalyst has been subjected to a defined number of run and regeneration cycles, the spen...
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Abstract
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