Carboxymethylcellulose from recycled newspaper in aqueous medium
1Istanbul Technical University, Science and Letters Faculty, Chemistry Department, Maslak, TR34469 Istanbul, Turkey. unlucu@itu.edu.tr
Carbohydrate Polymers
|June 18, 2013
Summary
Researchers successfully converted recycled newspaper cellulose into carboxymethylcellulose (CMC) using an aqueous alkaline method. This process yields commercial-grade CMC, offering a sustainable alternative for industrial applications.
Area of Science:
- Chemical Engineering
- Materials Science
- Polymer Chemistry
Background:
- Recycled paper cellulose has limitations for direct industrial use due to reduced mechanical strength.
- Cellulose derivatives offer broader industrial applications.
- Carboxymethylcellulose (CMC) is a widely used cellulose derivative, typically synthesized via heterogeneous modification in alkaline alcoholic media.
Purpose of the Study:
- To investigate the carboxymethylation of cellulose derived from recycled newspaper in an aqueous alkaline solution.
- To optimize reaction conditions for efficient derivatization.
- To produce commercial-grade CMC from recycled newspaper.
Main Methods:
- Cellulose was recovered from recycled newspaper using oxidative alkaline conditions.
- Carboxymethylation reactions were performed in an aqueous alkaline dispersion.
- Reaction parameters such as component concentrations and temperature were varied to find optimal conditions.
Main Results:
- Cellulose recovery ranged from 75-90% (w/w).
- The synthesized CMC samples exhibited a degree of substitution (DS) between 0.3-0.7%.
- The final CMC product contained 84-94% carboxymethylcellulose.
Conclusions:
- Carboxymethylation of recycled newspaper cellulose is feasible in aqueous alkaline dispersions.
- The process yields commercial-grade CMC suitable for industrial applications.
- This method provides a sustainable route for producing valuable cellulose derivatives from waste paper.
