The performance of benzenesulfonic acid catalyst on the alkylation of thiophenic sulfur

Abstract

Catalytic performance of benzenesulfonic acid was investigated for alkylation of thiophenic sulfur compounds with diene. The alkylates were confirmed by gas chromatography-mass spectrometry technique. The reaction conditions were optimized as follows: temperature is 85°C, catalyst/feed weight ratio is 10 % and time is 80 min. Under the conditions, the conversion of thiophene was nearly 73 %. The catalyst exhibited some recycle-use performance. The catalytic activity could be maintained by addition of the fresh catalyst periodically and quantitatively.

High-Purity Fatty Acid n-Octyl Esters from Housefly (Musca domestica L.) Larval Lipids, a Potential New Biolubricant Source

“…In addition, the heating energy for n -octanol in both the esterification and subsequent recovery step was conserved. At room temperature (25 °C), BSA forms white deliquescent sheet crystals or a white waxy solid, with a melting point and a boiling point of 44 and 137 °C . Thus, it is easy to handle, transfer, and store .…”

“…Thus, it is easy to handle, transfer, and store . At elevated reaction temperatures (100 °C), the catalyst melts to catalyze esterification and can be recovered for recycle usage after cooling . Compared with other acid catalysts (e.g., heteropoly acid, sulfated zironcia, zeolite, and other supported catalysts), BSA has advantages such as wide availability and no required preparation.…”

“…At room temperature (25 °C), BSA forms white deliquescent sheet crystals or a white waxy solid, with a melting point and a boiling point of 44 and 137 °C. 34 Thus, it is easy to handle, transfer, and store. 35 At elevated reaction temperatures (100 °C), the catalyst melts to catalyze esterification and can be recovered for recycle usage after cooling.…”

“…35 At elevated reaction temperatures (100 °C), the catalyst melts to catalyze esterification and can be recovered for recycle usage after cooling. 34 Compared with other acid catalysts (e.g., heteropoly acid, sulfated zironcia, zeolite, and other supported catalysts), 25 BSA has advantages such as wide availability and no required preparation. In addition, unlike other substituents (e.g., 3-amino-4-methylbenzenesulfonic acid, 4-amino-3-methylbenzenesulfonic acid), BSA is reported to be 90% biodegradable, 36 and it can be recovered by high vacuum.…”

An ecofriendly and reusable solid acid catalyst ZrO2‐SIEC for highly selective alkylation of 2,4/2,5‐xylenol

“…To effectively implement the chemical reaction processes of both alkylation and dealkylation, it necessitated the introduction of catalysts, while the same catalyst was applicable to both reactions. Among a range of catalysts studied, the commonly used liquid acids such as alkylbenzene sulfonic acid and sulfuric acid have demonstrated high catalytic efficiency 14–17 . However, the addition of a large amount of acid in the homogeneous reaction system has inevitably led to difficulties for catalyst separation and products purification.…”