Kadla et. observed that the lignin obtained from kraft pulping contains soda ash, which restricts its thermal processability; therefore, the kraft lignin is washed with HCl to remove the ash. Hardwood kraft lignin physically blended with PEO was used for carbon fiber production. The blend was melt-spun to obtain the precursor fibers. Interestingly, the glass transition temperature and fiber spinning temperature decreased drastically because of the addition of PEO. However, before melt spinning, these blends were subjected to thermal pretreatment for 1 hour at 145°C in the hot air oven to remove volatile contaminants. After spinning, the fibers were thermostabilized for 1 h at 250°C under pressure. Subsequently, carbonization was done at 1000°C at 3°C/min. It was observed that the mechanical properties of the resultant carbon fiber were influenced by the amount of PEO, thermostabilization, and carbonization conditions.