Mixed Sulfate Soap Washing with Neutralized Spent Acid

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UDС

668.473

DOI:

10.17238/issn0536-1036.2019.5.194

Abstract

Sulfate soap, being a valuable by-product of pulp production by the sulfate process, is a mixture of saponified resin and fatty acids and unsaponifiables (sterols, fatty alcohols, aliphatic hydrocarbons, etc.). Sulfate soap micelles enlarge and during surfacing may entrain a portion of black liquor containing dissolved lignin, as well as impurities of calcium compounds; when settling the liquor formed in pulp washing. The main method of removing black liquor is additional settling of sulfate soap prior its processing. It is reasonable and cost effective to use for washing a solution of salts formed in decomposition of soap or spent acid neutralized to pH = 8–14. The article shows the necessity of washing of sulfate soap obtained from different wood species in pulping. Neutralized spent acid received in soap decomposition was used as a washing solution in an amount of 10, 20, and 30 % of sulfate soap volume. Washing was carried out at a temperature of 20–80 °C. The optimal conditions for mixed sulfate soap washing were determined: temperature (20–40 °C), and flow rate of the washing solution (10–20 %). It was found that under optimal washing conditions of mixed sulfate soap with neutralized spent acid, the yield of crude tall oil and its acid number increase, the alkali and lignin content decrease, and the decrease of resin acids in tall oil is prevented.

Authors

E.V. Starzhinskaya¹, Process Engineer; ResearcherID: E-2862-2019, ORCID: 0000-0002-4989-264X
A.M. Kryazhev², Doctor of Engineering, Chief Technologist; ORCID: 0000-0002-3287-6387
S.I. Tret’yakov³, Candidate of Engineering, Prof.; ResearcherID: S-2192-2019, ORCID: 0000-0003-1783-5349
A.A. Glukhanov³, Candidate of Engineering, Assoc. Prof.

Affiliation

¹LLC “Tekhservis”, ul. Sovetov, 4, of. 300, Novodvinsk, 164900, Russian Federation; e-mail: Lesochimik-lena@mail.ru
²LLC “Advis Plus”, nab. Obvodnogo kanala, 150, korp. 363, of. 232, Saint Petersburg, 191011, Russian Federation; e-mail: kryazhev@advisplus.com
³Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; e-mail: s.tretyakov@narfu.ru

Keywords

sulfate soap, tall oil, black liquor, lignin, soap washing

For citation

Starzhinskaya E.V., Kryazhev A.M., Tret’yakov S.I., Glukhanov A.A. Mixed Sulfate Soap Washing with Neutralized Spent Acid. Lesnoy Zhurnal [Forestry Journal], 2019, no. 5, pp. 194–202. DOI: 10.17238/issn0536-1036.2019.5.194

References

1. Komshilov N.F., Polezhayeva N.S. A Method of Crude Sulfate Soap Purification. Authorship Certificate USSR, no. 502992, 1976.

2. Bogomolov B.D., Sapotnitskiy S.A., Sokolov O.M., Sokolova A.A., Filippov B.S., Mariyev A.A., Tiranov P.P., Tret’yakov S.I., Novozhilov E.V., Gelfand E.D., Selyanina L.I., Borisov G.V. Processing of Sulfate and Sulfite Liquors: Textbook for Universities. Moscow, Lesnaya promyshlennost’ Publ., 1989. 360 p.

3. химия и технология). М.: Гослесбумиздат, 1962. 280 с. [Bogomolov B.D., Sokolova A.A. By-products of Sulfate Pulp Production (Chemistry and Technology). Moscow, Goslesbumizdat Publ., 1962. 280 p.

4. Golovin A.I., Trofimov A.N., Uzlov G.A., Zhukova I.P., Kiprianov A.I., Prokhorchuk T.I., Kovalev V.E. Wood Chemical Products of Sulfate Pulp Production. Moscow, Lesnaya promyshlennost’ Publ., 1988. 288 p.

5. Kuznetsov S.N. Phenomenology of Foam Washing of Sulfate Soap. Referativnaya informatsiya «Lesokhimiya i podsochka», 1988, no. 7, p. 4.

6. Minina E.V., Tret’yakov S.I., Selyanina S.B. Sulfate Soap Washing with Acid Water. Abstracts of the Cluster Сonference on Organic Chemistry “OrgChem-2013”, Repino Village, Saint Petersburg, July 17–21, 2013. Saint Petersburg, 2013, pp. 415–416.

7. Boulz R.I., Forehn D.S., Griffin D.Kh., Suonn E.H. Method of Manufacturing Crude Tall Oil by Soap Washing with Separation of Calcium Carbonate. Patent RF, no. 2528196, 2014.

8. Selyanina L.I., Selyanina S.B. Recycling of Low-Quality Sulfate Soap: Monography. Arkhangelsk, ASTU Publ., 2008. 208 p.

9. Selyanina S.B., Selivanova N.V. Hydrophilic-Oleophilic Properties of Sulfate Lignin. Zhurnal prikladnoy khimii [Russian Journal of Applied Chemistry], 2007, vol. 80, no. 7, pp. 170–175.

10. Selyanina S.B., Shvarev P.O. The Effect of Sulfate Soap Washing on Tall Oil Obtaining. Lesnoy Zhurnal [Forestry Journal], 1996, no. 1-2, pp. 157–161.

11. Tret’yakov S.I., Glukhanov A.A. Optimization of Sulphate Soap Washing with Acid Water and the Quality Conformance Assessment of Tall Oil with Regulatory Requirements. Lesnoy Zhurnal [Forestry Journal], 2018, no. 3, pp. 149–160. DOI: 10.17238/issn0536-1036.2018.3.149; URL: http://lesnoizhurnal.ru/upload/iblock/29e/149_160.pdf

12. Trufanova M.V., Selyanina S.B. The Influence of Mineral Components on the Disposal of Spent Cooking Solutions of Sulfate Pulp Production. Proceedings of the International Youth Ecologist Forum of the Countries of the Barents Region, Arkhangelsk, July 2–5, 2001. Arkhangelsk, ASTU Publ., 2001, pp. 167–168.

13. The Effectiveness of Sulfate Soap Washing with Various Solutions. Referativnaya informatsiya «Lesokhimiya i podsochka», 1975, no. 8, p. 5.

14. Chemical Pulping. Part 2, Recovery of Chemicals and Energy. Ed. by P. Tikka. Finland, Paper Engineers’ Association, 2008. 387 p.

15. Foran С.D. Tall Oil Soap Recovery. TAPPI Kraft Recovery Short Course, Tampa, FL, USA, June 17–20, 2005. Tampa, FL, Tappi, 2005, pp. 4.3-1–4.3-21.

16. Foran С.D. Tall Oil Soap Recovery. Chemical Recovery in the Alkaline Pulping Processes. Tappi, 2007, pp. 45–56.

17. Foran C.D., Swann F.E., Bowles R.E. Process for Recovering Crude Tall Oil. Patent US, no. 10041020, 2018.

18. Hofstedt A.G. Method and System for Washing of Crude Tall Oil Soap. Patent WO/2016/093765, 2016.

19. Hofstedt A.G. Method and Arrangement for the Separation of Tall Oil Products from Black Liquor. Patent US, no. 9719048, 2017.

20. Johansson A. Purification of Sulphate Soap. International Tall Oil Symposium, Imatra, Finland, June 7–9, 1983. Turku, Åbo Akademis kopieringscentral, 1983, p. 99–109.

21. Kovasin K., Tikka P., Laxén T. Solving Soap and Turpentine Related Process Problems in Softwood Kraft Mills. Pulp and Paper: Canada, 2002, vol. 103, iss. 6, pp. 30–35.

22. Morris C.W., Watkins G.S. Tall Oil Recovery. Patent US, no. 3575952, 1971.

23. Nogueira J.M.F., Castanho M.A.R.B. Crude Tall-Oil Sodium Salts Micellization in Aqueous Solutions Studied by Static and Dynamic Light Scattering. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2001, vol. 191, iss. 3, pр. 263–268. DOI: 10.1016/S0927-7757(01)00692-6

24. Panda H. Handbook on Tall Oil Rosin Production, Processing and Utilization. New Delhi, Asia Pacific Business Press Inc., 2013. 480 p.

Received on February 07, 2019