Banca de QUALIFICAÇÃO: RONEL JOEL BAZAN COLQUE

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RONEL JOEL BAZAN COLQUE
DATE: 10/08/2021
TIME: 14:00
LOCAL: Remoto
TITLE:

PHYSICOCHEMICAL CHARACTERIZATION OF PRETREATMENT BY REACTIVE EXTRUSION OF MAIZE LIGNOCELLULOSIC PULP AIMING SYNTHESIS OF CARBOXYMETHYL CELLULOSE

KEY WORDS:

Agro-industrial residue, extraction, cellulose pulps, bleaching, optimization

PAGES: 37
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Tecnologia de Alimentos
SPECIALTY: Tecnologia de Produtos de Origem Vegetal
SUMMARY:

Maize lignocellulosic biomass (BLM) is a co-product generated mainly in maize grits and “biju” maize flour processing plants through dry milling of the grains. The amount of total dietary fiber reaches about 64% on a dry basis, being an interesting indication for the use in processes of extraction of cellulose and derivatives, such as carboxymethyl cellulose (CMC). The objective of this work is the use of reactive extrusion (REX) as a pre-treatment of BLM in the production of cellulose pulps for CMC synthesis. The project activities will be divided into the following steps, (1) choice of pulp extraction method, (2) extraction process optimization, (3) bleaching process and (4) CMC synthesis. A single screw extruder will be used, with pre-established parameters such as temperature profile (50, 90 and 110 °C), screw speed (100 rpm) and a circular die of 3 mm in diameter. In step (1) a completely randomized design (DIC) will be used to compare the cellulose extraction methods with and without REX, using NaOH (2%) and H₂SO₄ (2%) in order to select the best method. For (2) and (3) a central composite rotational design (DCCR) with a 2² factorial arrangement will be used and it is intended to use the response surface technique to optimize the processing parameters. (4) The synthesis of CMC will be carried out through the acetylation of the bleached pulp selected through a 2² factorial design with three replications, being the study variables the amount of chloroacetic acid mass (X₁) and reaction time (X₂). The resulting product will be characterized in order to assess the quality of the CMC produced. Of the study, it is intended to obtain raw and bleached cellulose pulps with low Kappa number and high extraction yield, optimization of cellulose pulp extraction parameters and bleaching and the preparation of food grade CMC.

BANKING MEMBERS:
Presidente - 105.290.788-13 - JOSÉ LUIS RAMIREZ ASCHERI - EMBRAPA
Interno - 009.412.587-26 - CARLOS WANDERLEI PILER DE CARVALHO - EMBRAPA
Externo à Instituição - MANUEL SALVADOR VICENTE PLATA OVIEDO - UTFPR