کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10566128 | 972202 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Esterification of sodium 4-hydroxybenzoate by ultrasound-assisted solid-liquid phase-transfer catalysis using dual-site phase-transfer catalyst
ترجمه فارسی عنوان
استرینگ سدیم 4-هیدروکسی بنزوات با کاتالیزوری انتقال فاز جامد و مایع با استفاده از سونوگرافی با استفاده از کاتالیزور انتقال فاز دوگانه
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کلمات کلیدی
کاتالیزور انتقال مایع جامد، دو کاتالیست انتقال فاز، تابش سونوگرافی، استرینگ، بنزیل 4-هیدروکسی بنزوات،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
چکیده انگلیسی
The catalytic esterification of sodium 4-hydroxybenzoate with benzyl bromide by ultrasound-assisted solid-liquid phase-transfer catalysis (U-SLPTC) was investigated using the novel dual-site phase-transfer catalyst 4,4â²-bis(tributylammoniomethyl)-1,1â²-biphenyl dichloride (BTBAMBC), which was synthesized from the reaction of 4,4â²-bis(chloromethyl)-1,1â²-biphenyl and tributylamine. Without catalyst and in the absence of water, the product yield at 60 °C was only 0.36% in 30 min of reaction even under ultrasound irradiation (28 kHz/300 W) and 250 rpm of stirring speed. When 1 cm3 of water and 0.5 mmol of BTBAMBC were added, the yield increased to 84.3%. The catalytic intermediate 4,4â²-bis(tributylammoniomethyl)-1,1â²-biphenyl di-4-hydroxybenzoate was also synthesized to verify the intrinsic reaction which was mainly conducted in the quasi-aqueous phase locating between solid and organic phases. Pseudo-first-order kinetic equation was used to correlate the overall reaction, and the apparent rate coefficient with ultrasound (28 kHz/300 W) was 0.1057 minâ1, with 88% higher than that (0.0563 minâ1) without ultrasound. The esterification under ultrasonic irradiation using BTBAMBC by solid-liquid phase-transfer catalysis was developed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 21, Issue 1, January 2014, Pages 395-400
Journal: Ultrasonics Sonochemistry - Volume 21, Issue 1, January 2014, Pages 395-400
نویسندگان
Hung-Ming Yang, Wei-Ming Chu,