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This paper presents the use of Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method to determine the optimum time, NaOH concentration, and temperature for reduction in lignin content, reduction in flexural rigidity, and tenacity of the coir yarns using box-behnken design. Optimum conditions for better properties are obtained from the ramp graphs. The results indicate that the TOPSIS method is appropriate for solving the multi-criteria optimization of the process parameters based on ranking system. The optimal value for time, concentration, and temperature are 3 h, 5% NaOH, and 80°C based on the defined criteria.

Multi-objective Optimization of Process Parameters for Lignin Removal of Coir Using TOPSIS