Tính chất và ứng dụng của sóng âm và sóng siêu âm trong hoá học xanh (Green chemistry of ultrasound)

Bài trình bày về: Tính chất và ứng dụng của sóng âm và sóng siêu âm trong hoá học xanh (Green chemistry of ultrasound). Đây là nguồn tài liệu cực kỳ có ích cho các bạn đang học về môn hoá học xanh ở bậc cao học, chỉ dùng làm tài liệu tham khảo thôi thì kiến thức của mình đã thay đổi hẳn.

GREEN CHEMISTRY

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Presented by:

Phạm Sỹ Nguyên Nguyễn Thị Kim Liên Dương Minh Mẫn

Supervisor:

 Assoc Prof Dr Nam Thanh Son Phan

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Contents

 Introduction

 Sound wave and ultrasound

 Applications of ultrasound in industry and chemistry, and ultrasound apparatus

 Power of ultrasound: Acoustic cavitation

 Effects of ultrasound on reactions

 4/12 Green principles are adapted

 Researches on ultrasound-assisted reactions

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SOUND WAVE AND ULTRASOUND

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4/12 green principles may be adapted

by using ultrasound

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Industrial applications of ultrasound

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6

Ultrasound apparatus ultrasonic cleaning bath

2

ultrasonic horn

Ultrasound apparatus

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THE POWER OF ULTRASOUND

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THE POWER OF ULTRASOUND

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ACOUSTIC CAVITATION

“Cavitation is an extraordinary

method of concentrating the

diffuse energy of sound into a

chemically usable form”.

Kenneth Suslick

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ACOUSTIC CAVITATION

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US FACTORs AFFECT AFFECTs FACTORs ???

Effects of Ultrasound

4

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HOMOGENEOUS PHASE REACTIONS

LIQUID-5

CAVITATION NEAR A SURFACE

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HETEROGENEOUS LIQUID REACTIONS

POWDER-5

HETEROGENEOUS LIQUID-LIQUID REACTIONS (EMULSION)

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RESEARCHES ON ULTRASOUND-ASSISTED REACTIONS

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“Ultrasound-promoted synthesis of quinolines using basic ionic liquids in aqueous media as a green procedure”

Elaheh Kowsari, M Mallakmohammadi 2011

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Effect of the ultrasonic irradiation time and the ultrasonic frequency on the substituted quinoline yield

The ultrasonic irradiation time had significant effect on the condensation, when the amount

of BIL1 (0.5 mmol) and the ultrasonic frequency (50 kHz) were kept constant At 1, 1.5, and

2 h, quinoline (3a) was obtained with 40%, 65%, and 95% GC yields, respectively

“Ultrasound-promoted a green protocol for the synthesis of 2,4-diarylthiazoles under ambient temperature in [bmim]BF 4 ”

Jalil Noei, Ahmad Reza Khosropour 2010

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APPLICATION

GENERAL PROCEDURE FOR THE SYNTHESIS OF IMIDAZOLIUM

HALIDES

N-alkylimidazole

TolueneAlkylbromideStirring 800 (18h)Extraction or filtration

Washing with ethyl acetate

N-alkylimidazole

TolueneAlkylbromideUltrasound iradiation 800 (5h)

Extraction or filtrationWashing with ethyl acetate

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HETEROGENEOUS LIQUID-LIQUID REACTIONS (EMULSION)

GENERAL PROCEDURE FOR THE METATHESIS REACTION OF

LEADING TO COMPOUNDS

Quaternary saltAcetonitrileNaBF4,KPF6,CF3COON

a,NaN(CN)2,NaNCS

Stirring 700 (3h)

Filtration

Quaternary saltAcetonitrileNaBF4,KPF6,CF3COONa,NaN(CN)2,NaNCS

Ultrasound iradiation 700

(45min)Filtration

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APPLICATION

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APPLICATION

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APPLICATION

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APPLICATION

PRECIPITATION

PorositySizeDensity

Chemical Flocculants or other

chemical agents

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Conclusion

Appendix 1: Effect of temperature

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Appendix 2: Effect of Intensity (or P A )

Appendix 3: Effect of frequency and time

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Appendix 4: Effect of solvent

1 VISCOSITY

Appendix 5: Effect of gas type and content

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