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Dairen Chemical Corporation

Darien Chemical Corp.

Cheng Chang Chu

Shien Chang Chen

Fu Shen Lin

June Yen Chou

Ming Hui Chu

This invention is directed to a process for producing cyclic ethers by liquid phase reaction, which comprises using a crystalline aluminosilicate zeolite as the catalyst, and subjecting an alkanediol to cyclodehydration at a temperature less than the boiling point of the alkanediol to obtain the corresponding cyclic ether.

Process for producing cyclic ethers by liquid phase reaction

1,4-butanediol is prepared from allyl alcohol containing allyl acetate and water. The allyl alcohol is subjected to a hydroformylation reaction in the presence of an organic solvent, a rhodium complex, and a phosphorous compound under an atmosphere of carbon monoxide and hydrogen, to produce a hydroformylation product, which is extracted with an alkaline aqueous solution in the presence of carbon monoxide and/or hydrogen. After the extraction, an extracted raffinate solution containing the rhodium complex in the organic solvent is recycled through the same hydroformylation process, while the extracted aqueous solution containing the hydroformylation product is subjected to a hydrogenation reaction in the presence of hydrogen, with a hydrogenation catalyst added, to produce 1,4-butanediol.

Process for preparing 1,4-butanediol

A controlled vibration experiment device having a vibration model structure to simulate actual mechanical vibration and to monitor and analyze the vibration by a computer monitor. The device has a base plate, a supporting frame, a T-shaped sliding rail, a servo motor, a connecting piece and a decoder with a rotatable shaft. The vibration produced is changed to an electrical signal and input to the computer to display the various type of waveforms. The vibration phenomena is then analyzed by a computerized monitor.

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Kaohsiung, Taiwan

Cheng Chang Chu