Water hyacinth (Eichhornia crassipes) is a plant that is considered as a weed that can damage ecosystems. In order to increase the added value of water hyacinth, this plant is used as one of the alternative sources in producing carboxymethyl cellulose (CMC) since it has high cellulose content. The stages of CMC production include alkylation, carboxymethylation, neutralization, purification and drying. The first two stages were performed by reacting cellulose fibers with NaOH and sodium monochloroacetat (ClCH2COONa) in a solvent medium. The mixture of isobutyl-isopropyl alcohol was used as solvent in this research. Then, the neutralization process is conducted by using acetic acid, purified with 96% ethanol, and drying stage by heating in an oven at temperature of 60 °C. Variations of variables in this research include the concentration of NaOH of 5%, 10%, 20%, 30% and 35%, and the ratio of composition isobutyl-isopropyl alcohol solvent at 20 ml:80 ml, 50 ml:50 ml, and 80 ml:20 ml. Carboxymethylation reaction temperature was set at 55 °C. CMC produced were characterized by measuring the value of (Degree of Subtitution) DS, purity and functional group analysis using FTIR. Based on the results, the CMC with the highest DS value is achieved at the condition of mixed composition isobutyl-isopropyl alcohol 20 ml: 80 ml and the concentration of NaOH at 10%.
- Carboxymethyl Cellulose (CMC)
- Degree of substitution
- Water hyacinth