Process to regulate olefin production by catalyst system inhibition
AssigneePhillips Petroleum Company
InventorsMark E. Lashier, Jeffrey W. Freeman, Ronald D. Knudsen
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Abstract
A process is provided to inhibit trimerization catalyst system activity which comprises the sequential steps of contacting a reactor effluent stream with alcohol; removing any desired olefin products; adding an aqueous base to the non-olefin portion; removing a precipitate; separating the aqueous and organic phases; and adding an acid to the aqueous phase.
Claims21
A process to inhibit an olefin trimerization catalyst system activity and to recover trimerization products and trimerization catalyst system components comprising the sequential steps of:
- a) forming a product stream by contacting an olefin trimerization reactor effluent stream which comprises olefin product(s), catalyst system, polymer(s) and/or oligomer(s) with an alcohol that is soluble in any portion of the reactor effluent stream;
- wherein said catalyst system comprises a chromium source, a pyrrole-containing compound and an alkylaluminum compound;
- b) separating the product stream of (a) by removing and recovering at least one olefin trimerization product to form a product portion and a waste portion;
- c) adding an aqueous, inorganic base to the waste portion of (b), to form an aqueous phase which comprises the inorganic base;
- an organic phase which comprises olefin product(s), polymer(s) and/or oligomer(s);
- and a precipitate which comprises chromium;
- d) removing the precipitate from the aqueous phase and organic phase;
- e) separating the aqueous phase and organic phase;
- and
- f) adding a mineral acid selected from the group consisting of sulfuric acid, phosphoric acid and mixtures thereof to the aqueous phase to remove substantially all of the aluminum.
A process to inhibit an olefin trimerization catalyst system activity and to recover trimerization products and trimerization catalyst system components comprising the sequential steps of:
- a) forming a product stream by contacting an olefin trimerization reactor effluent stream which comprises olefin product(s), catalyst system, polymer(s) and/or oligomer(s) with an alcohol that is soluble in any portion of the reactor effluent stream and has from six to twelve carbon atoms per molecule;
- wherein said catalyst system comprises a chromium source, a pyrrole-containing compound and an alkylaluminum compound;
- b) separating the product stream of (a) by removing and recovering at least one olefin trimerization product to form a product portion and a waste portion;
- c) adding an aqueous inorganic base selected from the group consisting of sodium hydroxide, potassium hydroxide, and mixtures thereof to the waste portion of (b), to form an aqueous phase which comprises the inorganic base;
- an organic phase which comprises olefin product(s), polymer(s) and/or oligomer(s);
- and a precipitate which comprises chromium;
- (d) removing the precipitate from the aqueous phase and organic phase;
- e) separating the aqueous phase and organic phase;
- and
- (f) adding a mineral acid selected from the group consisting of sulfuric acid, phosphoric acid and mixtures thereof to the aqueous phase to remove substantially all of the aluminum.
Dependencies are inferred from the claim text.