Double bond hydroisomerization process
A technology for hydroisomerization and hydrogen, which is applied in the fields of isomerization to produce hydrocarbons, chemical instruments and methods, separation methods, etc., and can solve problems such as unsuitability and loss of 2-butene feed.
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Embodiment 1
[0068] Example 1 - In C 4 H in the absence of butadiene in the feed stream 2 or CO-H 2 The mixture is injected at one feed point of the catalytic distillation column
[0069] use C 4 Double Bond Hydroisomerization and Separation Process for Separation of C Without Butadiene 4 flow. The reaction takes place in a catalytic distillation column equipped with catalytic distillation structures and conventional inert distillation packing. The catalyst is 680g in 1 / 8"Al 2 o 3 0.4% PdO on pellets (Engelhard) and wrapped in retort wire mesh packing in bulk coil form. The bales used covered 8 feet in a 2 inch by 32 foot catalytic distillation column (DC-100). The rest of the column was filled with 1 / 2 inch saddle packing.
[0070] The feed stream contains a mixture of 2-butene, 1-butene and isobutene. The composition of the feed stream is shown in Table 1 below. The feed is introduced into the column the full 8 feet below the catalyst.
[0071] Table 1
[0072] n-b...
Embodiment 2
[0079] Example 2 - In C 4 H in the presence of butadiene in the feed stream 2 or CO-H 2 The mixture is injected into the catalytic distillation column at one feed point
[0080] The catalyst was loaded into the distillation column in a similar manner to Example 1. Column operation was the same as in Example 1. However, as shown in Table 3, the feed contained 0.55% butadiene on a weight basis.
[0081] table 3
[0082] n-butane, wt% 0.09 1-butene, wt% 16.86 trans-2-butene, wt% 14.45 cis-2-butene, wt% 8.66 Isobutylene, wt% 59.39 1,3-Butadiene, wt% 0.55
[0083] With butadiene in the feed, a higher hydrogen flow must be produced to meet the hydrogen requirements for hydrogenating the butadiene to butenes, while maintaining the hydrogen to facilitate the hydroisomerization reaction. Feed rate and reflux remained the same as in Example 1. Table 4 shows that when butadiene is present, Examples 2D-2F use hydrogen and carbon monoxide...
Embodiment 3
[0088] Example 3 - In C 4 H in the absence of butadiene in the feed stream 2 Injection at multiple feed points
[0089] The catalyst was loaded into the distillation column in a similar manner to Example 1. Column operation also remains the same. In this example there was no butadiene or CO, and the feeds were those shown in Table 1. However, in Example 3B, the hydrogen flow is split equally between two separate injection ports. The tower bottoms injection point is the same as embodiment 3A, i.e. the same as C 4 Feed together. The second injection point is in the middle of the column with 4 feet of lower catalyst and 4 feet of catalyst above it. Table 5 shows the effect of splitting the hydrogen while keeping the total hydrogen flow rate constant.
[0090] table 5
[0091] Example number 3A 3B pressure, psig 80 80 Temperature at top of bed (℉) 131 129 Total Feed Flow Rate, lbs / hr 4.5 4.5 to H in the bottom column 2 , stan...
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