Process for dimerizing olefins
AssigneeNeste Oil Oyj
InventorsNiilo Oikarinen, Kari I. Keskinen, Antti Pyhälahti, Veli-Matti Purola
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Abstract
A process for dimerizing olefins in the presence of a catalyst, a hydrocarbon feedstock containing C4 to C6 isoolefins is subjected to dimerization. The process comprises the steps of contacting the C4 to C6 isoolefins at conditions conducive to dimerization with a catalytic material comprising an acidic mesoporous molecular sieve, the catalytic material being thermally stable at a temperature of at least 900° C., and carrying out the contacting step essentially in the absence of butadiene and water in the feedstock. By means of the invention, the dimerization process can be operated over extended periods of time with prolonged maintenance intervals.
Claims34
A process for dimerizing olefins in the presence of a catalyst, wherein a hydrocarbon feedstock containing C4 to C6 isoolefins is subjected to dimerization, said process comprising the steps of
- Contacting, in at least one reaction zone, the C4 to C6 isoolefins at conditions conducive to dimerization with a catalytic material comprising an acidic mesoporous molecular sieve embedded with a zeolite, the catalytic material being thermally stable at a temperature of at least 900° C., wherein said acidic mesoporous molecular sieve embedded with a zeolite is produced by preparing a mesoporous molecular sieve gel mixture, introducing a zeolite nuclei and homogenizing and dispersing said zeolite nuclei in said molecular sieve, and
- carrying out the contacting step essentially in the absence of butadiene and water in the feedstock.
The process according to any of claims 18 to 20, wherein the catalyst comprises 90-10 wt-% of the catalytic material according to claim 10 and 10-90 wt-% of a carrier.
A process for dimerizing olefinic, lower hydrocarbons, comprising:
- feeding an olefinic hydrocarbon feedstock to a reaction zone, wherein the olefinic hydrocarbon feedstock contains unsaturated hydrocarbons, selected from the group consisting of isobutene, 1-butene, 2-butene, linear C5-olefins and branched C5-olefins;
- contacting said olefinic hydrocarbon feedstock in liquid phase with an acid catalyst in the reaction zone, wherein the acid catalyst comprises a mesoporous molecular sieve embedded in a zeolite, the catalytic material being thermally stable at a temperature of at least 900° C.;
- and
- recovering from said reaction zone a product containing dimerized olefins.
A process for dimerizing olefins in the presence of a catalyst, wherein a hydrocarbon feedstock containing C4 to C6 isoolefins is subjected to dimerization, said process comprising the steps of
- contacting, in at least one reaction zone, the C4 to C6 isoolefins at conditions conducive to dimerization with a catalytic material comprising an acidic mesoporous molecular sieve embedded with a zeolite, the catalytic material being thermally stable at a temperature of at least 900° C., wherein said acidic mesoporous molecular sieve embedded with a zeolite is produced by preparing a mesoporous molecular sieve gel mixture, introducing a zeolite nuclei and homogenizing and dispersing said zeolite nuclei in said molecular sieve, and wherein said catalytic material contains only a single zeolite;
- and
- carrying out the contacting step essentially in the absence of butadiene and water in the feedstock.
Dependencies are inferred from the claim text.