Method for preparing isobutene
A technology for isobutene and butene, applied in the field of isobutene preparation, can solve the problems of complex utilization process of butadiene extraction device tail gas, difficult operation, poor economy and the like, and achieves reasonable utilization of butene, strong operability and energy consumption. low effect
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Embodiment 1
[0031] This example illustrates an example of the selective hydrogenation and isomerization reaction of the tail gas feedstock 1 of the butadiene extraction unit.
[0032] The composition of tail gas raw material 1 of the butadiene extraction unit is shown in Table 1.
[0033]Take titanium oxide content 16.2wt%, metal nickel content 17.5wt%, specific surface area is 91m 2 Ni / TiO with a pore volume of 0.48ml / g and a most probable pore diameter of 110 angstroms 2 -Al 2 o 3 50 milliliters of the catalyst was packed in the reactor, and the reaction pressure was 1.5 MPa, the temperature was 110° C., and the hydrogen flow rate was 40 milliliters / min. The reduction was carried out for 8 hours.
[0034] When the reactor inlet temperature is 30°C, the reaction pressure is 1.2MPa, the molar ratio of hydrogen to olefin is 1.0, and the liquid volume space velocity is 10h -1 , feed the raw material 1 under the condition that the circulation ratio is 9:1 (the volume ratio of the hydroge...
Embodiment 2
[0043] This example illustrates the results of selective hydrogenation of butadiene extraction tail gas using nickel-based catalysts with different contents.
[0044] Take titanium oxide content 17.3wt%, metal nickel content 15.6wt%, specific surface area is 88m 2 Ni / TiO with a pore volume of 0.47ml / g and a most probable pore diameter of 105 angstroms 2 -Al 2 o 3 Catalyst 50 milliliters are loaded in the reactor, feed gas and reaction condition are the same as embodiment 1, and the result of selective hydrogenation is shown in Table 4. The calculated yield of n-butene is 34.8%, the yield of trans-2-butene is 33.91%, and the yield of cis-2-butene is 22.36%.
[0045] The results of the isomerization reaction are shown in Table 5. The calculated butene conversion rate is 37.93%, the isobutene selectivity is 85.31%, and the isobutene yield is 32.36%.
[0046] Table 4 hydrogenation product 2 composition
[0047]
[0048] Table 5 Isomerization product 2 composition
[0049...
Embodiment 3
[0051] This example illustrates an example of the selective hydrogenation and isomerization reaction of the tail gas feedstock 2 of the butadiene extraction unit.
[0052] The two catalysts and reaction conditions are the same as those in Example 1, except that the raw material composition of the butadiene extraction tail gas is changed, as shown in Table 6.
[0053] The results of selective hydrogenation are shown in Table 7, and the calculated yield of n-butene is 35.37%, the yield of trans-2-butene is 31.81%, and the yield of cis-2-butene is 22.68%.
[0054] The results of the isomerization reaction are shown in Table 8. The calculated butene conversion rate is 37.63%, the isobutene selectivity is 91.08%, and the isobutene yield is 34.28%.
[0055] Table 6 Raw Material 3 Composition
[0056]
[0057] Table 7 hydrogenation product 3 composition
[0058]
[0059] Table 8 isomerization product 3 composition
[0060]
[0061] As can be seen from Examples 1 and 3, un...
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