Banca de QUALIFICAÇÃO: TEO VINICIUS COELHO DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : TEO VINICIUS COELHO DA SILVA
DATE: 11/11/2025
TIME: 08:30
LOCAL: Auditório da biblioteca central
TITLE:

EVALUATION OF NEW MATERIALS OR EQUIPMENT MANUFACTURING PROCESSES TO REPLACE 316L STAINLESS STEEL EQUIPMENT FOR ZEOLITE DRYING UNITS.

KEY WORDS:

Corrosion, Zeolite, Ammonium Chloride, Austenitic Stainless Steel, Failures

PAGES: 35
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

This study addresses the problem of corrosion in equipment and structures, particularly screw conveyors, in units that produce catalysts for Fluidized Bed Catalytic Cracking (FCC). This is due to the presence of chloride ions during zeolitic catalyst production, especially during the ion exchange and zeolite Y drying stages. This leads to significant recovery and replacement costs. To mitigate these failures, the efficiency of alternative materials to AISI 316L stainless steel, such as Superduplex S32750 and Incoloy 800H, was evaluated for the fabrication of screw conveyors in two zeolite Y drying systems. The research included an in-depth literature review on corrosion, passivation, the behavior of austenitic stainless steels in chloride media, stress corrosion cracking, and the corrosion mechanisms in zeolite Y drying systems, as well as an analysis of the advantages and disadvantages of Superduplex and Incoloy steels. The experimental methodology comprised 6- and 7-month field tests with AISI 316L for material definition, salt spray laboratory tests and superduplex helicoid monitoring for performance evaluation, replicating real process conditions, complemented by thermochemical analyses and characterizations by optical and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical measurements in zeolite Y solutions. The preliminary results, focused on increasing service life and cost reduction, are being evaluated to propose a promising solution in the manufacture of equipment for zeolite drying systems.

COMMITTEE MEMBERS:
Presidente - 1804954 - SIMONE PEREIRA TAGUCHI BORGES
Interno - 1798055 - LUIZ ANTONIO BORGES JUNIOR
Externo à Instituição - JORGE LUIZ ROSA
Externo à Instituição - ROSINEI BATISTA RIBEIRO