Page 14 - 81Sulfonation-Sulfation Processing Technology for Anionic Surfactant Manufacture_opt

Sulfonation/Sulfation Processing Technology for Anionic Surfactant Manufacture 281

Figure 12 proves that the unsulfonated matter percentage decreases the same as the
sulfonating reagent in the gas mixture increases.

5.3 Acid value
Figure 13 shows the effect of the conditions process on acid value. Increase in the sulfur
trioxide has a positive effect in agreement with expectations; also the increase of
temperature in process enlarges the acidity in the product. Change in the slope can be
explained by kinetics effects favored by temperature rising. Both the increase in the mole
ratio and sulfur trioxide in the sulfonating mixture can be explained by the effectiveness of
the reaction because an excess of SO 3 promotes the consumption of the same reactants for
the generation of over-sulfonated matter.

Fig. 13. Acid values obtain by changes of mole ratio, temperature and SO 3 inlet

5.4 Coloration
Figure 14 presents the trends for the coloration in the sulfonated product which intensifies
the values of concentration of SO 3 some that the mole ratio and SO 3 content in the gas
stream. All variables show a direct influence to the increase in color which is associated with

Fig. 14. Impact on coloration in the sulfonated product due to variations of process

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