The dual drive counter-rotating axial flow pump is characterized by that the preset impeller and rear-mounted impeller are respectiely mounted on the shafts of two motors, its water-feeding part is mounted between one motor and front portion of shell, and its water-discharging part is mounted...
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The invention provides a method for synthesizing 1, 3- disubstituted - ene- 1- pentanone. It takes iridium complex compound as catalyst and pi-allyl beta- keto acid ester as raw material to synthesize said product with large area and high enantiotropic selection. The invention is characterized ...