Reactors coupled with membrane separation, such as pervaporation, can help enhance the conversion of reactants for thermodynamically or kinetically limited reactions via selective removal of one or more product species from the reaction mixture. Efficacy of pervaporation in driving esterification of lactic and succinic acids with ethanol, which are both reversible reactions, to near completion by stripping water has been established in the author's previous experimental studies. A detailed analysis of reversible condensation reactions - where one of the products (water) is removed via membrane separation - is presented in this work for different reactor - separator configurations. Appropriate numerical illustrations are provided to supplement the analysis. The role of resistances for reaction and membrane separation is investigated, including comparison to perfect membrane, and performance of the reactor - separator systems is compared.