China University of Petroleum

Xin Gong

Jun Li

Hui Du

Dong Liu

Zhihao Li

Bin Lou

Jianguo Zhang

Fushan Wen

Xiujie Yang

Zhaojun Chen

Changlong Yin

Nan Shi

Zhiqing Ma

Chong Jiao

Yonggang Cao

Luning Chai

Zhichen Zhang

Enqiang Yu

Yu'e Fu

Huizhi Yuan

A method for preparing needle coke for ultra-high power (UHP) electrodes from heavy oil is provided. In this method, heavy oil is used as a raw material. The size exclusion chromatography (SEC) is conducted with polystyrene (PS) as a packing material to separate out specific components with a relative molecular weight of 400 to 1,000. The ion-exchange chromatography (IEC) is conducted to remove acidic and alkaline components to obtain a neutral raw material. The neutral raw material is subjected to two-stage consecutive carbonization to obtain green coke, and the green coke is subjected to high-temperature calcination to obtain the needle coke for UHP electrodes. The needle coke has a true density of more than 2.13 g/cmand a coefficient of thermal expansion (CTE) of &#x2264;1.15&#xd7;10/&#xb0; C. at 25&#xb0; C. to 600&#xb0; C.

Method for preparing needle coke for ultra-high power (UHP) electrodes from heavy oil

Preparation methods of a high modulus carbon fiber (HMCF) and a precursor (mesophase pitch (MP)) thereof are provided. The preparation method of MP includes: separating components with a molecular weight distribution (MWD) of 400 to 1,000 from a heavy oil raw material through size-exclusion chromatography (SEC); subjecting the components to ion-exchange chromatography (IEC) to obtain modified feedstock oil, where, the components are passed through macroporous cation-exchange and anion-exchange resins in sequence to remove acidic and alkaline components; and subjecting the modified feedstock oil to thermal polycondensation and carbonization to obtain high-quality MP with prominent spinnability. With high mesophase content, low softening point, low viscosity, and prominent meltability and spinnability, the obtained MP is a high-quality raw material for preparing HMCFs. The obtained MP can be subjected to melt spinning, pre-oxidation, carbonization, and graphitization to obtain an MP-based HMCF.

Preparation methods of high modulus carbon fiber (HMCF) and precursor (mesophase pitch (MP)) thereof

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Xin Gong