A kind of regeneration method of n-butene isomerization to isobutene catalyst
A technology for producing isobutene and catalysts from n-butene, which is applied in the direction of isomerization to hydrocarbons, molecular sieve catalysts, chemical instruments and methods, etc., to achieve the effect of solving the selectivity climbing period, improving selectivity and restoring activity
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Embodiment 1
[0021] Knead hydrogen-type FER molecular sieve with aluminum hydroxide powder, sage powder, nitric acid and deionized water (mass ratio 40:5:1.5:1:50) to form a thick paste, using a stainless steel molded plate with 1.5mm holes Extrusion. The obtained extrudate was first dried at room temperature for 24 hours, then dried at 110°C for 8 hours, and finally calcined at 550°C for 12 hours to obtain the final catalyst, correspondingly marked as C-1.
[0022] The performance of the catalyst was evaluated by the skeletal isomerization of n-butene. Before each catalyst evaluation, the catalyst needs to be pretreated in a high-purity nitrogen atmosphere at 500°C for 2 hours, and then cooled to the reaction temperature. The raw material gas is a mixed gas composed of 1-butene with a volume fraction of 1-butene of 10% and high-purity nitrogen. The reaction products were analyzed online by Agilent7890 gas chromatograph. Reaction conditions for n-butene skeletal isomerization: temperatu...
Embodiment 2-6
[0024] Take the carbon deposition deactivation catalyst A in Example 1, heat up to the regeneration temperature in a high-purity nitrogen atmosphere, then switch to a dry oxidizing regeneration gas, and perform charcoal regeneration. After regeneration for a certain period of time, switch to a high-purity nitrogen atmosphere and then cool down to Room temperature, unloading, as the regenerated catalyst, the treatment conditions are shown in Table 1.
[0025] Table 1
[0026] Example Regeneration temperature (°C) Regeneration time (h) Oxygen content of regeneration gas (volume fraction) (%) Carbon deposition (mass fraction) (%) Regenerated Catalyst Number 2 650 48 15 <<0.1
Embodiment 7
[0028] The same method as in Example 1 was used to evaluate the regenerated rear catalysts C-2, C-3, C-4, C-5, and C-6, and the results are shown in Table 2-Table 4.
[0029] Table 2 n-butene conversion rate
[0030] Response time (min) C-1 C-2 C-3 C-4 C-5 C-6 10 75.3 75.0 70.8 62.5 68.2 60.2 30 65.4 64.5 63.5 60.4 62.8 48.6 60 60.3 60.5 59.2 58.6 61.2 44.6 180 54.2 54.0 53.5 53.5 54.0 35.6 300 50.8 51.6 50.1 51.5 51.6 31.2
[0031] Table 3 isobutene selectivity
[0032] Response time (min) C-1 C-2 C-3 C-4 C-5 C-6 10 32.5 33.1 35.0 65.2 50.6 58.2 30 55.2 55.2 56.0 68.9 60.3 70.5 60 68.3 57.8 70.2 72.8 67.0 73.5 180 81.5 82.1 81.5 81.2 80.2 78.5 300 86.9 86.4 85.3 85.8 85.7 80.2
[0033] Table 4 isobutene yield
[0034] Response time (min) C-1 C-2 C-3 C-4 C-5 C-6 10 24.5 24.8 24.8 40.8 34.5 35.0 30 36.1 35....
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