Preparation and Characterization of a Humate Surfactant with Hydroxymethylation and Esterification Modification of Lignite

Fenfen Li; Yeqian Wen; Xueqing Yu; Songmei Zhang; Gang Li

doi:10.3139/113.110475

Artikel

Preparation and Characterization of a Humate Surfactant with Hydroxymethylation and Esterification Modification of Lignite

Fenfen Li , Yeqian Wen , Xueqing Yu , Songmei Zhang und Gang Li

Veröffentlicht/Copyright: 6. Januar 2017

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Aus der Zeitschrift Tenside Surfactants Detergents Band 54 Heft 1

Abstract

In this paper, a humate surfactant based on humic substances which were derived from lignite by modification of hydroxymethylation and esterification methods respectively was prepared. Determined by surface tension method, the cmc (critical micelle concentration) of the humate surfactant is 1.534 g/L and the corresponding surface tension is 48.8 mN/m. The optimum conditions of the modified processes are as follows: hydroxymethylation modification at pH 10.5, reaction temperature 90°C, reaction time of 60 min, dosage of stock (formaldehyde/lignite/g g⁻¹) 10:10, and the amount of reacted paraformaldehyde was 6.23 mmol/g lignite. The esterification modification was carried but at 70°C, reaction time 10 h, dosage of 6.0 mmol n-decanoyl chloride/g lignite. The conversion rate of n-decanoyl chloride was 95%.

Kurzfassung

In diesem Beitrag wurde ein Humat-Tensid basierend auf Huminverbindungen, die aus Braunkohle durch modifizierte Hydroxymethylierungs- und Veresterungsreaktionen stammen, präpariert. Die Bestimmung der Oberflächenspannung liefert für das Humat-Tensid eine kritische Mizellenbildungskonzentration (cmc) von 1,534 g/L; die Oberflächenspannung an der cmc beträgt 48,8 mN/m. Die optimalen Verfahrensbedingungen der modifizierten Hydroxymethylierung sind: pH = 10,5; Reaktionstemperatur = 90°C, Reaktionszeit = 60 Minuten, Dosierung des Formaldehyd-Braunhohle-Stocks (g g⁻¹) = 10:10. Die Menge an Paraformaldehyd betrug 6.23 mmol/g Braunkohle. Die Versterungsreaktion wurde bei einer Reaktionstemperatur von 70°C, einer Reaktionszeit von 10 Stunden und einer n-Decanoylchlorid-Dosierung von 6 mmol pro g Braunkohle durchgeführt. Es wurden 90% des n-Decanoylchlorids umgesetzt.

Key words: Lignite; humic substances; hydroxymethylation; esterification modification; humate surfactant

Stichwörter: Braunkohle; Huminverbindungen; Hydroximethylierung; modifizierte Veresterung; Humat-Tensid

*Correspondence address, Prof. Gang Li, Hebei Provincial Key Lab of Green Chemical Technology & High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China, E-Mail: ligang@hebut.edu.cn

Gang Li is a research professor now working as a dean of chemical engineering institute of Hebei University of Technology in China, His area of research is synthesis and application of fine chemicals.

Fenfen Li is a postgraduate student of Hebei University of Technology, her research interests are modification and application of lignite and humic acids originated from lignite.

Yeqian Wen is a PhD of Hebei University of Technology, and woring as a laboratory technician. Her research interests are organic synthesis

Xueqing Yu is working as a teacher in chemical engineering institute of Hebei University of Technology.

Songmei Zhang is a senior laboratory technician and working in chemical engineering institute of Hebei University of Technology.

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Received: 2016-02-05

Accepted: 2016-04-14

Published Online: 2017-01-06

Published in Print: 2017-01-20

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Artikel in diesem Heft

https://doi.org/10.3139/113.110475

Schlagwörter für diesen Artikel

Lignite; humic substances; hydroxymethylation; esterification modification; humate surfactant