Process for oligomer production and saturation
AssigneeUop Lcc
InventorsRobert R. Frame, Laurence O. Stine, Hayim Abrevaya
Life of this patent
Estimating the term…
Abstract
A process for the production of C8 alkenes with high selectivities to 2,4,4-trimethylpentene by the oligomerization of isobutene and/or n-butene at lower temperatures is disclosed. Higher proportions of heavy paraffins mixed with the butene feed in the oligomerization zone improve the selectivity to 2,4,4-trimethylpentene along with better selectivity to octene and lower selectivity to dodecene. Additionally, we have found that n-butene codimerizes with isobutene selectively to 2,4,4-trimethylpentene.
Claims18
A process for oligomerizing isobutene and n-butene to a product comprising a high selectivity to 2,4,4-trimethylpentene, said process comprising:
- a) passing a feed stream comprising isobutene and n-butene to an oligomerization zone and contacting the feed stream with an oligomerization catalyst at oligomerization conditions;
- b) passing a saturate stream, comprising paraffins having a carbon number of at least 6 into said oligomerization zone with said feed stream and said catalyst at a weight ratio of said feed stream and said saturate stream to said feed stream of at least 8;
- and
- c) recovering an effluent stream including product exhibiting a greater selectivity to 2,4,4-trimethylpentene than an effluent stream from a process with substantially the same conditions but with a smaller weight ratio of said feed stream and saturate stream to said feed stream.
An oligomerization process with a high selectivity to 2,4,4-trimethylpentene, said process comprising:
- a) passing a feed stream comprising n-butene and isobutene to an oligomerization zone and contacting the feed stream with a solid phosphoric acid catalyst at oligomerization conditions including a reaction inlet temperature of no greater than 250° F. (121° C.);
- b) passing a saturate stream, comprising paraffins having a carbon number of at least 6 into said oligomerization zone with said feed stream and said catalyst, wherein a weight ratio of said feed stream and said saturate stream to said feed stream is 8 or greater;
- and
- c) recovering an effluent stream including product exhibiting a selectivity to 2,4,4-trimethylpentene of at least 40 wt-%.
An oligomerization process with a high selectivity to octene and a low selectivity to dodecene in an effluent stream, said process comprising:
- a) passing a feed stream comprising butene to an oligomerization zone and contacting the feed stream with an acidic oligomerization catalyst at oligomerization conditions including a reaction temperature of 250° F. (121° C.) or less, said oligomerization catalyst having a Hammett acidity function of less than −4;
- b) passing a saturate stream, comprising paraffins having a carbon number of at least 6 into said oligomerization zone with said feed stream and said catalyst, wherein a weight ratio of said feed stream and said saturate stream to said feed stream is 8 or greater;
- and
- c) recovering said effluent stream comprising said paraffins and a product exhibiting a selectivity to octene of at least 80 wt-% and a selectivity to dodecene of 11 wt-% or less.
Dependencies are inferred from the claim text.