A method of separately producing tert-butanol and sec -butanol, the method comprising the steps of: introducing a mixed butenes stream to a tube side of a reaction membrane unit, wherein the tube side of the reaction membrane unit comprises a TBA catalyst, wherein the mixed butenes stream comprises butene gases; introducing a TBA reactor water feed to the tube side of the reaction membrane unit, wherein the TBA reactor water feed comprises water; introducing a sweep gas to a shell side of the reaction membrane unit, wherein the sweep gas is selected from the group consisting of nitrogen, argon, other noble gases, and combinations of the same, wherein the shell side of the reaction membrane unit comprises an SBA catalyst; introducing an SBA reactor water feed to the shell side of the reaction membrane unit, wherein the SBA reactor water feed comprises water; allowing the mixed butenes stream to contact the tube side of a membrane in the reaction membrane unit such that selective gases in the mixed butenes stream permeate through the membrane to the shell side, wherein the selective gases are selected from the group consisting of 1-butene, 2-butene, and combinations of the same; allowing the selective gases that permeate through the membrane to react with water in the presence of the SBA catalyst to produce sec -butanol, wherein the shell side operates at a SBA reaction temperature; allowing retentate gases that fail to permeate through the membrane to react with water in the presence of the TBA catalyst to produce tert-butanol, wherein the tube side operates at a TBA reaction temperature, wherein the retentate gases comprise isobutene; collecting the tert-butanol in a TBA reactor effluent; and collecting the sec-butanol in a SBA reactor effluent. introducing a mixed butenes stream to a tube side of a reaction membrane unit, wherein the tube side of the reaction membrane unit comprises a TBA catalyst, wherein the mixed butenes stream comprises butene gases; introducing a TBA reactor water feed to the tube side of the reaction membrane unit, wherein the TBA reactor water feed comprises water; introducing a sweep gas to a shell side of the reaction membrane unit, wherein the sweep gas is selected from the group consisting of nitrogen, argon, other noble gases, and combinations of the same, wherein the shell side of the reaction membrane unit comprises an SBA catalyst; introducing an SBA reactor water feed to the shell side of the reaction membrane unit, wherein the SBA reactor water feed comprises water; allowing the mixed butenes stream to contact the tube side of a membrane in the reaction membrane unit such that selective gases in the mixed butenes stream permeate through the membrane to the shell side, wherein the selective gases are selected from the group consisting of 1-butene, 2-butene, and combinations of the same; allowing the selective gases that permeate through the membrane to react with water in the presence of the SBA catalyst to produce sec -butanol, wherein the shell side operates at a SBA reaction temperature; allowing retentate gases that fail to permeate through the membrane to react with water in the presence of the TBA catalyst to produce tert-butanol, wherein the tube side operates at a TBA reaction temperature, wherein the retentate gases comprise isobutene; collecting the tert-butanol in a TBA reactor effluent; and collecting the sec-butanol in a SBA reactor effluent. <EOS>