Optimization of the process of abies ethanol lignin sulfation by sulfamic acid-urea mixture in 1,4-dioxane medium : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1007/s00226-020-01157-6

Аннотация: The new process of abies ethanol lignin sulfation by a low-toxic mixture of sulfamic acid and urea in 1,4-dioxane medium was optimized, and the structure of sulfated ethanol lignin was studied. The process of lignin sulfation is described by a first-order equation in the temperature range 70-100 degrees C. The value of the rate conПоказать полностьюstants is weakly dependent on the ratios of lignin and sulfating complex (sulfamic acid-urea mixture). The activation energy of the sulfation process decreases from 11.5 to 7.5 kJ/mol with an increase in the content of the sulfating complex (SC). The optimal conditions for sulfation of abies ethanol lignin with a high yield of water-soluble sulfated lignin [(100% of mass) with sulfur content of 7.9%] were found: temperature 95-100 degrees C, L/SC ratio 1:2.3-1:2.9, time 2 h. The composition and structure of water-soluble sulfated ethanol lignin were determined by elemental analysis, FTIR spectroscopy, two-dimensional NMR spectroscopy and gel permeation chromatography. It was shown that only alcoholic OH groups of ethanol lignin react with sulfamic acid. Sulfated ethanol lignin has a higher molecular weight and a lower degree of polydispersity compared to the initial ethanol lignin.

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Издание

Журнал: WOOD SCIENCE AND TECHNOLOGY

ISSN журнала: 00437719

Место издания: NEW YORK

Издатель: SPRINGER

Авторы

  • Kuznetsov B.N. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Prospect 79, Krasnoyarsk 660041, RussiaArticleEarly Access)
  • Vasilyeva N.Yu (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Prospect 79, Krasnoyarsk 660041, RussiaArticleEarly Access)
  • Kazachenko A.S. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Levdansky V.A. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Kondrasenko A.A. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Malyar Yu N. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Prospect 79, Krasnoyarsk 660041, RussiaArticleEarly Access)
  • Skvortsova G.P. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)
  • Lutoshkin M.A. (FRC KSC SB RAS, Inst Chem & Chem Technol SB RAS, Akademgorodok 50-24, Krasnoyarsk 660036, Russia)

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