Separation And Application Of Lignosulfonate

Application of lignin sulfonate in China is still in the primary stage,only a feware low value use,mostly as waste,not only a waste of resources,but also its emissions caused serious pollution to the environment.especially waterresources.Therefore.the high added value product research and development of lignin sulfonate,is particularly important.In order to make better utilization of lignosulfonate in different pulping waste liquor,he structural characteristic and properties of acid magnesium lignosulfonate,alkali sodium lignosulfonate and commercially available sodium lignosulfonate were investigated by means of Ultraviolet,Fourier transform infrared spectroscopy,Ion chromatography,and Therto gravimetric.The results show that alkali sodium lignosulfonate contained more lignin,and acid magnesium lignosulfonate contained less lignin compared with commercially available sodium lignosulfonate.The ion content of alkali sodium lignosulfonate isolated from black liquor comparing with commercially available sodium lignosulfonate was similar.The alkali sodium lignosulfonate had a weight loss process in 340-400? due to decomposition of sulfonic acid group.But acid magnesium lignosulfonate is more pure than alkali sodium lignosulfonate.In addition,Alkaline precipitation occurs in the red liquor from acidic magnesium sulfite pulping,which is different from the red liquor of acidic sodium sulfite pulping.The alkaline precipitation was characterized by obvious stratification.The Mg/lignin ratio and average molecular weight were investigated via infrared spectroscopy,ion chromatography,and thermogravimetric analysis of the upper and lower precipitations.The results showed that the lower precipitation contained either more Mg or less lignin than the upper precipitation.According to Fourier transform infrared spectroscopy,the sulfonic group of lignosulfonate had a characteristic absorption peak from 1210 cm-1-1170 cm-1 and 1040 cm-1.The peak time of the sulfonic group was 6.350 min,measured by ion chromatography.Both upper and lower precipitations had sulfonic acid and similar anionic species.Compared with the upper precipitation,the lower precipitation had more groups with high carbon and low oxygen contents and did not easily decompose.The average molecular weight of the lower precipitation was greater than that of the upper precipitation.research the reaction of magnesium Lignosulfonate with phenol at solid-liquid ratio(W/V)of magnesium Lignosulfonate and the sulfuric acid less 1:4,obtained the product that has good adsorption capacity of heavy metals.he results show that the product without sulfuric acid has the best adsorption capacity,and the adsorption rate was 98.71%;While the reaction of magnesium Lignosulfonate with phenol at solid-liquid ratio(W/V)of magnesium Lignosulfonate and the sulfuric acid 1:5,1:6,1:7,1:8,get a two-phase system,and then analyzed the Properties of the two-phase system,the Propertie were investigated using muffle furnace,ultraviolet spectroscopy,Atomic absorption,Surface tension meter and Viscometer.Results showed that:The solid-liquid ratio(W/V)of magnesium lignosulfonate and sulfuric acid at 1:5 and 1:6,1:7,1:8,the dark layer is the organic layer not containing magnesium,and the light layer is acid liquid layer containing magnesium.and then Compared the Properties of the commercial sodium lignosulfonate,magnesium lignosulfonate,and organic layer compound,in addition,the Propertie were investigated using ultraviolet spectroscopy,Fourier-transform infrared spectroscopy,ion chromatography,and thermogravimetric analysis.Results showed that:After the reaction of Magnesium Lignosulfonate with phenol under acidic conditions,not only does Magnesium Lignosulfonate doff Mg electropositive,but also sulfonic acid and phenol esterification of sulfonic acid ester.