Zhejiang Huahai Pharmaceutical Co., Ltd.

Zhejiang Hailiang Co., Ltd.

Zhejiang Huahai Zhicheng Pharmaceutical Co., Ltd

Yue Li

Weimin Ma

Jing Wang

Xuelong Zhao

Wenquan Zhu

Jinsheng Lin

Zhangquan Zhu

Dan Li

Jie Zhao

Wenbin Chen

Zhongzhan Zhang

Lirong Jiang

Min Li

Jia He

Zhefeng Ruan

Liyun Tian

Fuliang He

Yina Pan

Zhen Fan

Liyong Wang

Shili Ouyang

Wencai Peng

Jingke Yu

Zhenming Wang

Xibin Lin

Yonglong Fu

Guang Zhou

Xiaoyong He

Jianping Feng

Lusen Huang

Zhiqiang Dong

Xiaofei Liu

Provided are a pregabalin lactam methylene dimer and a preparation method therefor. The method comprises the following steps: dissolving pregabalin in a reaction solvent, reacting same with an aldehyde in an acidic system and isolating the obtained target product pregabalin lactam methylene dimer. The preparation method for pregabalin lactam methylene dimer provided by the present application has a simple operation, a high product yield, a good purity and a low cost.

Pregabalin lactam methylene dimer and preparation method therefor

The present invention provides a copper billet horizontal continuous casting apparatus with a vertical shaft furnace for smelting and a corresponding process. The copper billet horizontal continuous casting apparatus with a vertical shaft furnace for smelting includes: a vertical shaft, a refining furnace, a mixing furnace, a holding furnace, and a continuous casting furnace; wherein the refining furnace includes a furnace body, and a gas flushing device disposed beneath the furnace body, a gas flushing brick is provided at the chamber bottom wall of the furnace body; a gas inlet device is provided on the vertical shaft furnace; the vertical shaft furnace further includes a detecting device and an adjusting device which are connected with the air inlet device.

Copper billet horizontal continuous casting apparatus and process with a vertical shaft furnace for smelting

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Zhejiang, China

Yue Li