POSSIBILITIES OF IMPROVING QUALITY CHARACTERISTICS OF INACTIVE NEUTRAL LIGNOSULFONATES
Abstract
The article proposes a method of increasing the amount of OH-phenolic functional groups in the composition of a macromolecule lignosulphonate, a sulfo-derivative natural lignin polymer, tested under laboratory conditions by step-by-step chemical treatment of the lignosulphonate matrix with a solution of a bromine derivative, then with a solution of neutral sodium sulfite. This makes it possible to solve the problem characteristic of modern lignosulphonates of neutral sulfite production method, which have low values of tannidicity index: content of OH-phenolic groups, quantitative content of which forms inhibitory (tanning) capacity of lignosulphonates. The proposed procedure involves carrying out said demethylation reaction with cleavage of methyl group contained in phenylpropane unit of lignosulfonate. Pyrocatechin groups are formed and methanesulfonic acid molecule is cleaved off. The obtained product was analyzed by UV spectroscopy and the increase in optical density in the area of absorption of 280 nm characteristic of OH-phenolic functional groups was shown, which is the basis for the appearance of pyrocatechin structures in the phenylpropane unit of lignosulfonate. Proposed method allows increasing quantitative content of OH-phenolic groups in macromolecule composition from 1.7% of initial to 6.5%. The obtained results are correlated with the data on determination of tannidicity index - one of objective characteristics of inhibitory (tanning) capacity of lignosulfnates, which is 32%, compared to similar characteristic of undemethylated neutral lignosulfonate, where the value did not exceed 21%. The data show that demethylation of the lignosulphonate matrix is possible by converting modern inactive neutral lignosulphonates from the low-demand waste category of the pulp and paper industry to a promising raw material component.
References
Obolenskaya, A.V., Leonovich A.A. Chemistry of Wood. L.: LTA. 1989. 89 p. (in Russian).
Teptereva, G.A., Shushukova S.J., Konesev V.G., Ismakov R.A. Functional analysis of lignosulfonates used in drilling technology. Ufa: Oil and Gas Business. 2017. 92 p. (in Russian).
Teptereva G.A. Basis of production and application of lignosulfonates in drilling technology. Berlin: Lambert publishing house. 2017. 70 p. (in Russian).
Grazkin A.V., Petrik V.V., Smertin V.N. Dynamics of the state of the tree stand in the largest park of St. Petersburg. Izv. Vyssh. Uchebn. Zaved. Lesnoy Zhurn. 2011. N 6. P. 17-23 (in Russian).
Gavrilov B.M. Ligo-polymer reagents for drilling fluids. Krasnodar: Enlightenment-South. 2004. 398 p. (in Rus-sian).
Deineko I.P. Disposal of lignins: achievements, problems and prospects. Khim. Rastit. Syr’ya. 2012. N 1. P. 5-20 (in Russian).
Blaseiy A., Shutyiy L. Phenolic compounds of plant origin. M.: Mir. 1977. 239 p. (in Russian).
Sarkanen K.V., Ludwig K.H. Lignins: structure, proper-ties and reactions. M.: Lesnaya prom-t’. 1981. 402 p. (in Russian).
Bogolytsin K.G. Physicochemical methods of analysis. Arkhangelsk: AGTU publishing house. 2003. Part 2. 228 p. (in Russian).
Eisenstadt A.A., Bogdanov M.V., Bogolytsin K.G. Reactivity of model compounds of lignin structural unit. Izv. Vyssh. Uchebn. Zaved. Lesnoy Zhurn. 1998. N 2. P. 83 - 89 (in Russian).
Palamarchuk I.A. Corporate interactions in the lignosulfonate-chitosan system. Khim. Rastit. Syr’ya. 2008. N 4. P. 29-31 (in Russian).
Rusakov D.S. Modification of phenol formaldehyde resin by products of sulfite-cellulose production. Sistemy. Metody. Tekhnologii. Electron. nauch. zhurn. "Inzhener. Vestn. Dona". 2016. N 1. P. 113-119 (in Russian).
Ashirbekova R.O. Research and development of formu-lations of gel-forming compositions based on lignosulfanates. Vestn KazNTU. 2015. N 4. P. 169-177 (in Russian).
Evstyfeev E.N., Nesterov A.A. Development of modified lignosulfonates. Izv. Vyssh. UIchebn. Zaved. Sev.–Kavk. Reg. Estestv. Nauki. 2006. N 4. P. 48-53 (in Russian).
Bolatbaev K.N., Lugovitskaya T.N., Kolosov A.V. Identification and physiomechanical properties of ligno-sulfonates in solutions. Polzunov. Vestn. 2009. N 3. P. 308-312 (in Russian).
Brovko O.S., Palamarchuk I.A., Makarevich N.A., Boytsova T.A. Polymolecular characteristics of sodium lignosulfonates, chitosan and polyethylene polyamine. Khim. Rastit. Syr’ya. 2009. N 1. P. 29-36 (in Russian).
Khabarov Yu.G. Babkin I.M., Veshnyakov V.A. Study of interaction of iron (II) cations with lignosulfonic acids and their derivatives. Physical chemistry of plant polymers: mater. IV Interunat. conf. Arkhangelsk. 2011. P. 215 (in Russian).
Babkin I.M., Khabarov Yu.G., Veshnyakov V.A. Peptizing properties of lignosulfonates. Arkhangelsk: IPTs SAFU. 2012. Pt. 2. P. 116-118 (in Russian).
Khabarov Yu.G., Babkin I.M., Veshnjakov V.A. Sythesis of magnetoactive substance on the basis of iron com-plexes with modified lignosulfonic acids. Italic 6 Science & Technology of Biomasses: Advances and Challenges From forest and agricultural biomasses to high added value products: processes and materials. Viterbo, Italy: Tuscif University. 2011. P. 70-73.
Ladasov A.V., Kosyakov D.S., Bogolitsyn K.G. Methyl sulfate 1-butyl 3-methyl imidozoline is a new solvent of lignocellulose materials. Izv. Vyssh. Uchebn. Zaved. Lesnoy Zhurn. 2011. N 6. P. 81-88 (in Russian).
