Kusumaningtyas, Ratna Dewi and Astuti, Widi and Nugroho, Daniel Setiyo and Wulandari, Ajeng Riswanti OPTIMASI DAN PROPORTIONAL INTEGRAL DERIVATIVE (PID) TUNING PADA SISTEM REACTIVE DISTILLATION UNTUK REAKSI ESTERIFIKASI DALAM SINTESIS BIODIESEL. OPTIMIZATION AND PROPORTIONAL INTEGRAL DERIVATIVE (PID) TUNING ON REACTIVE DISTILLATION SYSTEM FOR ESTERIFICATION IN BIODIESEL SYNTHESIS. (Submitted)