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Study of cellulose dissolution process assisted by carbon dioxide in sub/supercritical state (carbonation) and subsequent regeneration processes

Grant number: 19/20779-9
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2019
Effective date (End): December 31, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Organic Chemistry
Principal researcher:Antonio Aprigio da Silva Curvelo
Grantee:Matheus Fernandes Flores
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Cellulose is an abundant, renewable natural resource and is produced in an commercial scale by a highly developed industry. Equally abundant, carbon dioxide registers a significant increase in concentration in the atmosphere due to the use of fossil fuels in human activities and such increase is considered as the main cause of climate change. In the current context, the industry seeks new applications for cellulosic pulps and the products object of this project fit this perspective, combining two abundant raw materials (cellulose and carbon dioxide), for the development of new products and their production processes. From different sources of commercial cellulosic pulp, the project aims to produce cellulose carbonate. Carbon dioxide will be used in sub/supercritical states as carbonation reagent to obtain cellulose carbonate. Cellulose carbonation aims at its dissolution and subsequent production of cellulose regenerated by the controlled release of carbon dioxide. The regeneration of cellulose will be tested aiming at the production of regenerated cellulose yarns and films, as well as the controlled coating of different substrates (ceramic, metallic and polymeric). In addition to obtaining higher value-added products from renewable raw materials, the proposed processes represent an important environmental gain by replacing carbon disulfide by carbon dioxide in the production of regenerated cellulose (rayon, viscose and cellophane).

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