Cofco (Jilin) Bio-Chemical Technology Co., Ltd

Nutrition & Health Research Institute, Cofco Corporation

Cofco Biotechnology Co., Ltd.

Jilin Cofco Biomaterial Co., Ltd

Tsinghua University

State Grid Corporation of China

Fang Tian

Bo Chen

Wei Lin

Yi Tong

Tai An

Lida Wu

Kejia Xu

Yuanheng Guo

Dayong Li

Haijun Liu

Wei Zhang

Kai Yang

Qiong Wu

Xiaoyan Wang

Fang Li

Chao Peng

Jianfeng Yan

Gang Duan

Jin Tao

Yu Dong

Jingtao Wu

Weiqiang Zhou

Guoqiang Chen

Anni Liu

Zhaoning Cui

Xuemei Shen

Yaozhong Xin

Hongzhu Tao

Provided a method for separating PHA and PHA prepared therefrom. The method comprises the following steps: subjecting a PHA fermentation broth to solid-liquid separation to obtain a thallus precipitate; breaking cell walls of the thallus precipitate, and subjecting obtained wall-broken products to a plate and frame filtration to obtain PHA; a filter cloth for the plate and frame filtration is pre-coated with a PHA layer. The method adopts a plate and frame separation to replace the traditional centrifugal separation to prepare PHA, and the PHA layer is pre-coated on the filter cloth for the plate and frame filtration, thereby overcome the defects in the prior art such as high cost and operational difficulty caused by adopting multiple centrifugal separations; in addition, the method of the present disclosure also exhibits the advantages of high recovery rate of PHA and high purity of the prepared PHA product.

Method for separating PHA and PHA prepared therefrom

The present invention relates to the field of high polymer material manufacturing, and discloses an air-isolated continuous feeding system for synthesizing polylactic acid from lactide and a feeding method thereof. The continuous feeding system comprises a raw material bag/box and a raw material collector for collecting and outputting lactide, the raw material bag/box is connected with a shielding gas input pipeline, a discharge pipe is movably inserted into the raw material bag/box, a cyclone separator is connected downstream of the discharge pipe, and a solid substance outlet of the cyclone separator is connected with the raw material collector. According to the invention, deterioration of the lactide raw material incurred by moisture absorption and oxidation is avoided, and the reaction conversion ratio and final product purity are improved. The continuous feeding system is easy to operate, can save manpower and material resources, and is applicable to industrial application.

Air-isolated continuous feeding system for synthesizing polylactic acid from lactide and feeding method thereof

A method for efficiently producing PHA comprising: inoculating PHA fermentation strains into a fermentation medium for fermentation under the condition of being capable of producing PHA through fermentation; subjecting the fermentation broth to a solid-liquid separation to obtain fermentation supernatant and thallus precipitate; breaking the cell walls of the thallus precipitate, and subjecting the wall-broken products to a plate and frame filtration to prepare PHA; pre-coating a filter cloth for the plate and frame filtration with a PHA layer; at least part of the water of the fermentation medium is PHA process wastewater. The method utilizes the PHA process wastewater as at least part of the water of the fermentation medium, and filters and separates the broken thallus with the plate and frame filtration equipment pre-coated with PHA layer to prepare PHA, thereby recycling the high-salt wastewater, reducing costs, and potentially separating PHA on a large scale for industrial production.

Method for efficiently producing PHA

The present invention relates to the field of devolatilization, and discloses a polylactic acid devolatilization evaporator, which comprises: a container comprising a cylinder; an agitating shaft coaxial with the cylinder; an agitating belt connected to the agitating shaft and arranged in a spiral shape around the central axis of the cylinder, comprising an outer belt surface facing the inner circumferential surface of the cylinder and spaced apart from the inner circumferential surface of the cylinder. With the above technical scheme, the agitating belt makes the materials distributed more uniformly on the inner circumferential surface of the cylinder and form a thin layer in uniform thickness, thereby avoids agglomeration of the materials, facilitates uniform heating of the materials, avoids deterioration (e.g., darkened color) of the materials owing to non-uniform heating of the materials and excessive retention time in a high-temperature environment, and improves product quality.

Polylactic acid devolatilization evaporator

A method and a system for a comprehensive analysis of low frequency oscillation. The method includes: firstly, initiating a wide area measurement system WAMS () to perform real-time monitoring; transmitting real-time low frequency oscillation information to a dynamic early-warning system () periodically; then converting the low frequency oscillation information received by the dynamic early-warning system () into an input file for stability calculation with small disturbance, and performing related calculation; finally, transmitting the calculated result back to the wide area measurement system WAMS () and a human-machine system interface for output. The system includes: the wide area measurement system WAMS (), the dynamic early-warning system (), a system for stability calculation with small disturbance () and an output system ().

Method and system for a comprehensive analysis of low frequency oscillation

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