长链烷基二甲苯磺酸的制备与性能研究

doi:10.3969/j.issn.1001-1803.2020.04.004

Abstract

Abstract:

Long-chain alkyl xylene sulfonic acid was synthesized from C_15~19 alkyl xylene by SO₃ bubbling sulfonation and characterized by FT-IR and ¹H NMR. The sulfonation conditions of long-chain alkyl xylene sulfonic acid were investigated by single factor test with its mass fraction in the product as the index. When SO₃ reacted with alkyl xylene at a mole ratio of 1.2∶1, sulfonation temperature of （45±3） ^oC, volume fraction of SO₃ vapor of 8%, aging time of 20 min, and hydrolysis time of 10 min, the mass fraction of long-chain alkyl xylene sulfonic acid in the product could exceed 94.5%. The surface activity of long-chain alkyl xylene sulfonate was investigated by the measurement of static surface tension and dynamic contact angle. The results indicated that, the critical micelle concentration （cmc） and surface tension at cmc （γ_cmc） of long-chain alkyl xylene sulfonate were 1.08×10 ^-2 mmol/L and 31.45 mN/m at 298 K, respectively. When the concentration of long-chain alkyl xylene sulfonate was higher than 4 cmc, it showed wettability to paraffin film.

Key words: long-chain alkyl xylene sulfonic acid, gaseous sulfur trioxide, sulfonation, surface tension, contact angle

CLC Number:

TQ423

QIAO Jian-fen,LI Jian-bo. Preparation and properties of long-chain alkyl xylene sulfonic acid[J].China Surfactant Detergent & Cosmetics, 2020, 50(4): 233-237.

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Preparation and properties of long-chain alkyl xylene sulfonic acid

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