Patent ID: 9682898
Date: 2017-06-20
CPC Classifications: C07C,C07D,C10G

Claim:
1. A process for preparing a C 8 olefin or a C 12 olefin by oligomerization of butenes, comprising: a) oligomerizing a portion of butenes present in a hydrocarbon mixture comprising a 2-butene and a further linear butene other than the 2-butene, to give one or more C b) removing the unreacted butenes from the oligomerizate; and c) optionally, recycling a part of the removed unreacted butenes to the oligomerizing a); wherein: the sequence of a), b) and c) is carried out at least once with inclusion of the recycling c); during the first time that the oligomerizing a) is carried out, a concentration of 1-butene in the hydrocarbon mixture, based on the concentration of linear butenes, is less than or equal to an equilibrium concentration of 1-butene, resulting from the reaction temperature of the sequence carried out for the first time, within the fraction of the linear butenes present in the hydrocarbon mixture during the first time; the C during the sequence carried out for the first time, the conversion of butenes, assessed directly over a first reaction zone, is limited to a first limit value of between 26.1 and 40 wt %; and the limiting of the conversion in the oligomerization is accomplished by limiting the reaction temperature of the oligomerization to a maximum temperature of between 40° C. and 140° C.