Sodium lignosulphonate, soluble in water, was prepared from kraft lignin, precipitated from black liquor, using Na2S20S or Na2S03 in a plug reactor at 6-7 atmospheres, pH=6.5 and 175 c: Then, the FT-IR and UV
spectra of the product were compared with the spectra of imported lignosulphonate. Also, usning gel permeation chromatography (GPC), the average molecular weights of the product and that of imported sample
were compared and the results evaluated. It was confirmed that the sulphonation of kraft lignin has occured and the specifications of the product and those of the authentic sample are reasonably similar
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