Sk Innovation Co., Ltd.

Sk Energy Co., Ltd.

Hyeon Hui Lee

Min Su Koo

Young Bin Seo

Ji Yun Park

Hye Ryun Seo

Ju Hoe Kim

Keum Jung Yoon

A method for reducing waste by recovering transition metal of a lithium secondary battery of the present invention includes preparing a cathode active material from a cathode of the lithium secondary battery, producing a first leachate by treating the cathode active material with a first acidic solution containing a reducing agent in an amount smaller than an amount corresponding to a reaction equivalent of the cathode active material, and producing a second leachate by treating the remaining cathode active material, which excludes a fraction contained in the first leachate, with a second acidic solution containing a reducing agent. Accordingly, extraction rate of manganese and purity of cobalt may be improved.

Method for reducing waste by recovering transition metals from lithium secondary battery

Provided is a method for separating normal paraffin and isoparaffin from raffinates of a benzene, toluene, and xylene (BTX) reforming process including C5 to C8 light naphtha, the method including: a liquid hydrogenation process for removing olefin by feeding raffinates in which hydrogen is dissolved into a reactor filled with a hydrogenation catalyst.

Method for separating normal paraffin and isoparaffin from hydrocarbon oil

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Daejeon, South Korea

Hyeon Hui Lee