This invention covers a process for making Octene from nix C.sub.4 Feed by a low cost highly selective multistage process. The multi staging of reactors essentially provides lower cost than conventional processes. Two options are provided in FIGS. 1 and 2 as regards to configuration based on the same catalyst but as can be seen that FIG. 1 configuration is low cost option with very high selectivity. The process provides conversion of butene to Octene >95% and product purity >96%. Product can be fractionated and can have a high purity Octene product by removing the trimers/polymers from the octene product. As mentioned due to the nature of the process configuration, one achieves high yield and selectivity with low cost.

 
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