AMMONIUM CHLORIDE RECOVERY FROM WASTEWATER

• Main Author: Rizki Tazkia Az Zahra, Nur
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/61461
• Institution: Institut Teknologi Bandung

Polyvinyl Chloride (PVC) is one of the most common polymers for daily use. However, PVC needs thermal stabilizer such as methyl tin ethylhexyl thioglycolate (MTET) to prevents degradation at high temperature which causes functional damage. In the production of the stabilizer, ammonium chloride (NH4Cl) is produced in the wastewater since there is neutralization of HCl using base, NH4OH. NH4Cl is a multipurpose inorganic compound, for example, dry cells electrolyte, fertilizer, pharmaceuticals, etc. Thus, NH4Cl in wastewater should be recycled to reduce the wastewater treatment cost, to increase NH4Cl added-value, and to recycle water used in the process. The main objective of this study is to develop the process of NH4Cl recovery from thermal stabilizers wastewater by undertaking evaporation-crystallization process. The recovery process will be carried out by thermal vapor recompression (TVR) system for saving energy. This research involves developing process flow diagram and evaluating TVR system using Aspen Plus V.10 and ANSYS 2021 R1. The recovery process involves evaporation and crystallization at various pressure of the evaporation and steam jet ejector system as major unit for TVR. Two parameters including NH4Cl yield and steam consumption per produced NH4Cl crystal from each system are compared. NH4Cl yield for recovery process by conventional method without recycle, with recycle, and TVR method are 0.54, 1, and 1 respectively. While steam consumption are 7.30 kg steam/kg crystal, 5.21 kg steam/kg crystal, and 4.66 kg steam/kg crystal respectively. Based on the simulations’ results, the most efficient method for NH4Cl recovery process is TVR system.