Fabrication of a Microevaporator Equipped with a Piezoelectrically-Driven Diaphragm Pump.

Accession number;03A0107685
Title;Fabrication of a Microevaporator Equipped with a Piezoelectrically-Driven Diaphragm Pump.
Author; SOTOWA K (Kyushu Univ., Fukuoka, Jpn) MIYAGAWA D (Kyushu Univ., Fukuoka, Jpn) ZHAO G (Kyushu Univ., Fukuoka, Jpn) KUSAKABE K (Kyushu Univ., Fukuoka, Jpn) MOROOKA S (Kyushu Univ., Fukuoka, Jpn) TAKAHASHI K (Kyushu Univ., Fukuoka, Jpn)
Journal Title;J Chem Eng Jpn
Journal Code:S0629A
ISSN:0021-9592
VOL.36;NO.1;PAGE.7-13(2003)
Figure&Table&Reference;FIG.12, TBL.1, REF.38
Pub. Country;Japan
Language;English
Abstract;An evaporator unit for use in microreactor systems was constructed. The unit consisted of a micropump driven by piezoelectricity and a microevaporator heated electrically by means of a Pt wire. The micropump was comprised of two tightly bonded plates; a silicon(100) plate having three diaphragms and a glass plate having valve and pump chambers. These flow conduits were patterned by photolithography and formed by wet-etching. The diaphragms, as well as the valve and pump chambers, were 7mm in diameter, and were arranged triangularly. The discharge rates of the pumps were found to be dependent on the voltage and frequency applied to the piezo discs, the actuation pattern, the backpressure at the outlet, and the liquid viscosity. The pump assembled with an epoxy adhesive showed high discharge rates, while a similar one, assembled by anodic bonding, showed high discharge pressures. The flow rate of the former pump reached 60mL/min for water. The microevaporator channel was wet-etched on a 10mm*40mm silicon wafer, and a channel for a Pt wire heater was formed on the reverse side. Both sides of the silicon plate were covered with glass plates. Benzene, when pumped to the microevaporator, was evaporated to give a vapor flow rate of 6.8cm3/min, which is sufficiently large as a feed rate for a gas-phase catalytic microreactor. (author abst.)
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