Industrial Technology Research Institute

Yu-Lan Tung

Kuo-Ching Wu

Chiung-Hui Huang

Chiou-Hwang Lee

Chu-Chang Dai

Jyh-Chang Dai

The present invention discloses a nano-gold catalyst including a solid carrier and gold deposited on the carrier, wherein the deposited gold has a size less than 10 nm, and the carrier is a mixed metal hydroxide and oxide having the following formula:M(OH)qOyWherein M is Ti, Fe, Co, Zr, or Ni; q is 0.1-1.5; and q+2y=z, wherein z is the valence of M. The present invention also discloses a preparation process of the nano-gold catalyst.

Nano-gold catalyst and process for preparing the same

A method for producing maleimides. The method comprises reacting maleic anhydride and a primary amine at 100-180&deg; C. in an organic solvent using a solid acidic catalyst, and purifying the maleimide produced therefrom by extraction and crystallization. The molar ratio of the primary amine to maleic anhydride is about 0.8-1.6. With the present invention, high production yield with high purity of maleimides can be achieved. In addition, the solid acidic catalyst can be easily separated and recycled for subsequent use. Thus, the present invention provides a number of distinct advantages, including substantially improved yield, conveniently reusable catalyst, reduced waste disposal and lower costs.

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Hsinchu, Taiwan

Yu-Lan Tung