Process for providing a stream comprising a high proportion of 2,4,4-trimethylpent-1-ene

A process for providing a tops stream K containing more than 85% by weight of 2,4,4-trimethylpent-1-ene, wherein the process comprises:

• a) supplying a stream A containing 2,4,4-trimethylpent-2-ene (TMP-2) and 2,4,4-trimethylpent-1-ene (TMP-1) to a distillation unit and separating the stream A into at least the tops stream K enriched in 2,4,4-trimethylpent-1-ene relative to stream A and containing more than 85% by weight of 2,4,4-trimethylpent-1-ene and a stream B which is depleted in 2,4,4-trimethylpent-1-ene relative to stream A and contains 80% to 92% by weight of 2,4,4-trimethylpent-2-ene;
• b) performing an isomerization of 2,4,4-trimethylpent-2-ene to 2,4,4-trimethylpent-1-ene with stream B using a heterogeneous catalyst based on a zeolite or an ion-exchange resin to obtain a product stream of the isomerization in which a proportion of 2,4,4-trimethylpent-2-ene is lower and a proportion of 2,4,4-trimethylpent-1-ene is higher than in stream B;
• wherein the product stream of the isomerization is at least partially sent to the distillation as stream A, and
• wherein an input stream with which the process is fed and which is obtained from dimerization of isobutene, wherein the input stream consists essentially of 2,4,4-trimethylpent-2-ene and 2,4,4-trimethylpent-1-ene, wherein the input stream has a mass distribution of TMP1:TMP2 of about 78:22 to 81:19, and wherein the input stream is distinct from stream A and stream B,
• is sent to the distillation unit in a) in addition to stream A or to the isomerization in b) in addition to stream B.