China University of Petroleum

Changlong Yin

Dong Liu

Nan Shi

Xiujie Yang

Fushan Wen

Jun Li

Jianguo Zhang

Hui Du

Zhihao Li

Zhaojun Chen

Bin Lou

Xin Gong

Bo Wu

Gang Li

Luning Chai

Zhichen Zhang

Dehui Kong

Enqiang Yu

Shuhai Guo

Huizhi Yuan

Yu'e Fu

Hongbo Dai

Yu Qiu

Zhiqing Ma

Mengfei Li

Chong Jiao

Wei Zhu

Xiaoning Feng

Sa Wang

Yonggang Cao

A combined remediation method of petroleum-contaminated soil includes: impurity removal pretreatment, photocatalytic pre-oxidation, stepwise thermal desorption of petroleum from soil, and high-temperature oxidation; with iron-titanium composite metal oxide (ITCMO) as a catalyst, conducting oxidation pretreatment under light conditions so that some cross-linked structures in macromolecular petroleum contaminants are broken and degraded; and conducting stepwise pyrolysis to achieve a removal rate of more than 98.00%. The new method adopts a combined remediation technology of photocatalytic pre-oxidation-stepwise pyrolysis, which realizes a relatively-high removal rate of petroleum hydrocarbons and the efficient and harmless remediation of high-concentration petroleum-contaminated soil, and remedied soil can be reused.

Combined treatment method of petroleum-contaminated soil

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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Changlong Yin