The oldest pulping technique is the soda process, and it involves using sodium hydroxides as chemical reagents to pulp non-wood material, primarily consisting of annual plants and agricultural waste, including wheat straw, sisal, kenaf, hemp, and bagasse. In this, concentrated sodium hydroxide (NaOH) and biomass are reacted at a high temperature (170°C) and pressure. Because it lacks sulfur functions, soda lignin is more suited for usage as a natural lignin in various applications and widely employed as a precursor for raw materials .