Method for co-producing isobutene from n-butene to gasoline components
A technology of n-butene and isobutene, applied in chemical instruments and methods, petroleum industry, isomerization hydrocarbon production, etc., can solve the problem of low yield of isobutene
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Embodiment 1
[0033] Catalyst preparation: NaZSM-35 molecular sieve raw powder (SiO 2 / Al 2 o 3 The ratio is 22) to remove the templating agent by calcining at 550° C. for 4 hours. The obtained material was treated with 0.3M NaOH at 75° C. for 2 h with alkali, then filtered and dried with suction to obtain an alkali-modified molecular sieve. The material obtained by alkali treatment modification is mixed with alumina at a weight ratio of 1:0.5. Add nitric acid solution to the mixture, knead and extrude, and cut into pellets after drying and roasting. After ammonium exchange, the obtained material was heated at 550°C and space velocity for 2 hours -1 Under the condition of water vapor treatment for 2 hours, the catalyst was prepared.
[0034] Catalyst evaluation: using ether post-mixed C4 (n-butene content 93.1%) as raw material, the raw material composition is shown in Table 1; at a temperature of 420 ° C, a reaction pressure of 0.1 MPa, and a C4 liquid volume space velocity of 2 hours...
Embodiment 2
[0057] Catalyst preparation: NaZSM-35 molecular sieve raw powder (SiO 2 / Al 2 o 3 The ratio is 20) to remove the templating agent by calcining at 550° C. for 4 hours. The obtained material was treated with 0.3M NaOH at 75° C. for 2 h with alkali, then filtered and dried with suction to obtain an alkali-modified molecular sieve. The material obtained by alkali treatment modification is mixed with alumina at a weight ratio of 1:0.5. Add nitric acid solution to the mixture, knead and extrude, and cut into pellets after drying and roasting. After ammonium exchange, the obtained material was heated at 550°C and space velocity for 2 hours -1 Under the condition of water vapor treatment for 2 hours, the catalyst was prepared.
[0058] Catalyst evaluation: using ether post-mixed C4 (n-butene content 93.1%) as raw material, the raw material composition is shown in Table 1; at a temperature of 420 ° C, a reaction pressure of 0.1 MPa, and a C4 liquid volume space velocity of 2 hours...
Embodiment 3
[0060] Catalyst preparation: NaZSM-35 molecular sieve raw powder (SiO 2 / Al 2 o 3 The ratio is 20) to remove the templating agent by calcining at 550° C. for 4 hours. The obtained material was treated with 0.3M NaOH at 75° C. for 2 h with alkali, then filtered and dried with suction to obtain an alkali-modified molecular sieve. The material obtained by alkali treatment modification is mixed with alumina at a weight ratio of 1:0.5. Add nitric acid solution to the mixture, knead and extrude, and cut into pellets after drying and roasting. After ammonium exchange, the obtained material was heated at 550°C and space velocity for 2 hours -1 Under the condition of water vapor treatment for 2 hours, the catalyst was prepared.
[0061] Catalyst evaluation: using ether post-mixed C4 (n-butene content 93.1%) as raw material, the raw material composition is shown in Table 1; at a temperature of 420 ° C, a reaction pressure of 0.1 MPa, and a C4 liquid volume space velocity of 2 hours...
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