Sk Innovation Co., Ltd.

Sk Energy Co., Ltd.

Min Su Koo

Jae Yeon Park

In Ho Cho

Joong Min Park

Seung Yeop Lee

Woo Chan Park

Sin Young Kang

Dong Hyun Kim

Jae Wook Ryu

Sung Real Son

Yeon Hwa La

Young Bin Seo

Joon Sik Lee

Hyeon Hui Lee

Eun Hee Park

Hye Ryun Seo

Ju Hoe Kim

Young Hwan Chu

Ji Ye Na

A method for recovering an active metal of a lithium secondary battery according to an embodiment of the present application whereby a used lithium-containing mixture is prepared, and the used lithium-containing mixture is treated with a hydrogen reduction to prepare a preliminary precursor mixture. The preliminary precursor mixture is washed with water to generate a lithium precursor including lithium hydroxide. Lithium hydroxide can be obtained by the washing treatment with high purity.

Method for recovering active metal of lithium secondary battery

The method for recycling carbon dioxide according to the present invention includes: injecting a reaction gas containing carbon dioxide and a carbon raw material into a rotary heating furnace; reacting the reaction gas and the carbon raw material with each other in the rotary heating furnace to generate a hydrocarbon precursor containing carbon monoxide; and converting the hydrocarbon precursor into a hydrocarbon compound, thereby exhibiting excellent conversion rate of carbon dioxide.

Method for recycling carbon dioxide

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

Discloses is a continuous fermenter for sequential fermentation of hexose and pentose which includes (a) a hexose fermenter equipped with a saccharified solution supply unit containing hexose, pentose and lignin, a plurality of trays closing at least half of the diameter of the fermenter, impellers disposed on each of the trays, an impeller driving unit, a lignin discharge unit disposed at the bottom of the fermenter, a fermented solution discharge unit, and a temperature control jacket; and (b) a pentose fermenter equipped with a fermented solution supply unit for supplying the fermented solution discharged from the hexose fermenter, a plurality of trays closing at least half of the diameter of the fermenter, impellers disposed on each of the trays, an impeller driving unit, a lignin discharge unit disposed at the bottom of the fermenter, a fermented solution discharge unit, and a temperature control jacket.

Continuous fermenter for sequential fermentation of hexose-pentose

The present invention provides a fed-batch culture method comprising a step of fed-batch-feeding a carbon source base and a base in such a manner that the pH level can be maintained at a level suitable for the growth of microorganisms for fermentation of a carbon source. The present invention also provides a method for preparing organic acids using the fed-batch culture method. The present invention fed-batch-feeds a neutralizing agent such as ammonium bicarbonate, ammonium carbonate or alkali metal-containing weak base, and a carbon source substrate in preparing organic acids by microorganism fermentation. Thus, a pH level suitable for the survival of microorganisms for carbon source fermentation can be maintained, and the speed of injecting the carbon source base which is the source material can be appropriately adjusted. The present invention may improve productivity, yield rate and concentration of organic acids and may automatically inject a base and a carbon source substrate according to a variation in the pH level, thus improving reliability and convenience of a fermentation process operation.

Method for preparing organic acid by fed-batch-feeding carbon source substrate and base

The present invention relates to a method of producing cellulosic sugar from biomass by effective impurity removal and sugar separation, and more particularly to a method for producing cellulosic sugar from biomass. The method includes pretreating the biomass so as to be separated into a solid and a liquid; subjecting the separated liquid to monomerization, concentration and adsorption processes, thereby obtaining xylose; and subjecting the separated solid to second pretreatment, saccharification and lignin separation processes, thereby obtaining glucose. The method allows fermentation inhibitory substances to be removed from pretreated biomass in a cost- and energy-effective process, and is useful for effective production of cellulosic sugar.

Method of manufacturing cellulosic sugar from biomass through effective separation of impurities and sugar

The present invention relates to a method including: directly heating a fermentation broth to remove impurities, thereby preparing an organic vapor-phase dehydration feedstock; and continuously subjecting the organic vapor-phase dehydration feedstock to a vapor-phase dehydration reaction. According to the present invention, impurities in a fermentation broth, which have been removed by a multi-step process in the prior art, can be completely removed in a single-step process, and thus the time, cost and energy required for a process for preparing an organic vapor-phase dehydration feedstock from the fermentation broth can be effectively reduced, and the process for preparing the organic vapor-phase dehydration feedstock and a vapor-phase dehydration reaction can be continuously performed in an effective manner.

Method for preparing organic vapor-phase dehydration feedstock

Disclosed is a method of preparing alkyl butyrate, which comprises: (a) producing a fermented liquid containing butyrate salt through a fermentation process using butyric acid-producing strains; (b) obtaining an extracted liquid containing butyric acid from a continuous extracting apparatus using an extraction solvent, after converting the butyrate salt into butyric acid by adding an inorganic acid except for carbonic acid or carbon dioxide into the fermented liquid, wherein the continuous extracting apparatus includes a plurality of extraction plates which are installed inside an extraction column and perform a reciprocating motion vertically, and the broth and the extraction solvent are supplied to upper and lower portions of the column, respectively; and (c) reacting the extracted liquid and alcohol having a carbon number of 4 or less or a mixture thereof in an esterification reactor to convert a resultant product into alkyl butyrate. According to the present invention, butyric acid existing in microbic culture fluid can be efficiently extracted, and furthermore, competitively priced alkyl butyrate can be prepared without an additional process of separating the extracted solvent while minimizing energy consumption.

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Daejeon, South Korea

Min Su Koo