Processes and systems for C3+ monoolefin conversion

A process for C3+ monoolefin conversion, comprising:

• combining a first olefin mixture and a first process fluid to produce a first mixture, wherein the first olefin mixture comprises ≥1 wt. % of a first C3+ monoolefin, and wherein the first process fluid comprises ≥1 wt. % of a first alcohol;
• reacting the first mixture in the presence of a first catalyst to produce a first effluent comprising a first ether and unreacted first olefin mixture, wherein the first effluent comprises <1 wt. % of a first di-C3+ olefin or is free of any first di-C3+ olefin;
• separating a first product and a first byproduct from the first effluent, wherein the first product comprises at least a portion of the first ether, and wherein the first byproduct comprises at least a portion of the unreacted first olefin mixture;
• combining a second olefin mixture, at least a portion of the first byproduct, and a second process fluid to produce a second mixture, wherein the second olefin mixture comprises ≥1 wt. % of a second C3+ olefin;
• reacting the second mixture in the presence of a second catalyst to produce a second effluent comprising a second di-C3+ olefin, a second ether, unreacted first olefin mixture, and unreacted second olefin mixture, wherein reacting the second mixture produces a greater amount, on a mole basis, of the second di-C3+ olefin than the second ether;
• combining the second effluent and a third process fluid to produce a third mixture, wherein the third process fluid comprises ≥1 wt. % of a second alcohol;
• reacting the third mixture in a third reactor in the presence of a third catalyst to produce a third effluent comprising a third ether, a third di-C3+ olefin, unreacted first olefin mixture, and unreacted second olefin mixture;
• and
• separating a second product and a recycle from the third effluent, wherein the second product comprises at least a portion of any first di-C3+ olefin, at least a portion of the second di-C3+ olefin, and at least a portion of the third di-C3+ olefin, wherein the recycle comprises at least a portion of the second ether and at least a portion of the third ether, and wherein the second process fluid comprises ≥1 wt. % of the recycle.

A process for C3+ monoolefin conversion, comprising:

• separating a first olefin mixture and a second olefin mixture from a raffinate comprising a mixture of isobutylene, but-1-ene, cis-β-butylene, trans-β-butylene, n-butane, and isobutane, wherein the first olefin mixture and the second olefin mixture have substantially the same composition:
• combining methanol with the first olefin mixture to produce a first mixture;
• reacting the first mixture in the presence of a first catalyst comprising a first cation exchange resin to produce a first effluent comprising a first methyl tert-butyl ether and unreacted first olefin mixture, wherein the first effluent comprises <1 wt. % of any first diisobutylene or is free of any first diisobutylene:
• separating a first product and a first byproduct from the first effluent, wherein the first product comprises ≥98 wt. % of the first methyl tert-butyl ether, and wherein the first byproduct comprises at least a portion of the unreacted first olefin mixture;
• combining the second olefin mixture, the first byproduct, and a recycle comprising methyl tert-butyl ether to produce a second mixture;
• reacting the second mixture in the presence of a second catalyst comprising a second cation exchange resin to produce a second effluent comprising a second methyl tert-butyl ether, a second diisobutylene, unreacted first olefin mixture, and unreacted second olefin mixture, wherein reacting the second mixture produces a greater amount, on a mole basis, of the second diisobutylene than the second methyl tert-butyl ether;
• optionally combining methanol with the second effluent to produce a third reaction mixture;
• reacting the second effluent or the third reaction mixture in a third reactor in the presence of a third catalyst comprising a third cation exchange resin to produce a third effluent;
• separating a second byproduct from the third reactor and/or the third effluent, wherein the second byproduct comprises but-1-ene, cis-β-butylene, trans-β-butylene, n-butane, and isobutane;
• obtaining a second product, a third product, and the recycle from the third effluent, wherein the second product comprises ≥60 wt. % of diisobutylene, and wherein the third product comprises oligomers of order 3 produced from one or more of isobutylene, bute-1-ene, cis-β-butylene, and trans-β-butylene.