NOVELTY - An integrated ionic liquid alkylation and n-butane isomerization process (P1) involves (a1) contacting isoparaffin and olefin with ionic liquid catalyst in ionic liquid alkylation zone; (b1) separating alkylation hydrocarbon phase from alkylation reactor effluent of the alkylation zone; (c1) fractionating, via distillation unit, internal hydrocarbon feed to provide n-butane containing fraction, where the feed comprises the alkylation hydrocarbon phase; (d1) isomerizing a portion of the n-butane in the n-butane containing fraction to provide isobutane; and (e1) recycling the isobutane.    USE - As an integrated ionic liquid alkylation and n-butane isomerization processes (claimed).    ADVANTAGE - The integrated processes for ionic liquid catalyzed alkylation-butane isomerization increases the efficiency of alkylation; and decreases capital expenditure and operating costs.    DETAILED DESCRIPTION - An integrated ionic liquid alkylation and n-butane isomerization process (P1) involves (a1) contacting at least one isoparaffin and at least one olefin with an ionic liquid catalyst in an ionic liquid alkylation zone under ionic liquid alkylation conditions; (b1) separating an alkylation hydrocarbon phase from an alkylation reactor effluent of the ionic liquid alkylation zone; (c1) fractionating, via a distillation unit, an internal hydrocarbon feed to provide n-butane containing fraction, where the internal hydrocarbon feed comprises the alkylation hydrocarbon phase; (d1) isomerizing a portion of the n-butane in the n-butane containing fraction to provide isobutane; and (e1) recycling the isobutane to the ionic liquid alkylation zone. INDEPENDENT CLAIMS are included for the following:    (1) an integrated ionic liquid alkylation-butane isomerization process (P2) involving carrying out the steps (a1)-(c1); (d2) contacting the n-butane containing fraction with an isomerization catalyst in an isomerization zone under butane isomerization conditions; (e2) separating an isomerization hydrocarbon stream from an isomerization reactor effluent of the isomerization zone, where the isomerization hydrocarbon stream comprises isobutane, and the internal hydrocarbon feed further comprises the isomerization hydrocarbon stream; (f2) fractionating, via the distillation unit, the internal hydrocarbon feed to further provide an isobutane containing fraction; and (g2) recycling the isobutane containing fraction to the ionic liquid alkylation zone; and    (2) an integrated ionic liquid alkylation and n-butane isomerization process (P3) involving carrying out the steps (a1) and (b1); (c3) fractionating, via a distillation unit, an internal hydrocarbon feed to provide an n-butane containing fraction, where the internal hydrocarbon feed comprises the alkylation hydrocarbon phase and an isomerization hydrocarbon stream; (d3) contacting the n-butane containing fraction with an isomerization catalyst in an isomerization zone under butane isomerization conditions to provide an isomerization reactor effluent comprising the isomerization hydrocarbon stream; (e3) separating the isomerization hydrocarbon stream from the isomerization reactor effluent; (f3) recycling the isomerization hydrocarbon stream to the distillation unit; (g3) separating, via the distillation unit, an isobutane containing fraction from the internal hydrocarbon feed; and (h3) recycling the isobutane containing fraction to the ionic liquid alkylation zone.