Korea Institute of Science and Technology

Kwang Deog Jung

Jun W Oh

Oh S Joo

Hong Gon Kim

Chang Soo Kim

Sung J Uhm

Sung H Han

Hoon Sik Kim

Byoung Sung Ahn

Heung Yong Ha

Byung Gwon Lee

Byoung Koun Min

Gyeong Taek Gong

Moon Sue Lee

Oh-shim Joo

Sung Yun Hong

Minserk Cheong

Ho Yong Jo

Kye Sang Yoo

Jung Y Beak

Jun-haeng Lee

The present invention relates to a method and a process of preparing precipitated calcium carbonate of high purity by extracting calcium ion contained in an alkali ion-containing inorganic material such as mineral, steelmaking slag and waste concrete with the use of an acidic aqueous solution, separating other metal ions from the extracted solution, preparing an alkaline earth metal hydroxide using an alkaline aqueous solution and then contacting the same with carbon dioxide.

Preparation method of calcium carbonate with high purity from inorganic materials containing alkali metals or alkali earth metals

A preparation method of a CIS-based or CIGS-based thin film for a light absorption layer of a solar cell, which uses a paste prepared by mixing precursors of Cu, In, Se, and optional Ga in a solvent, minimizes the raw material loss, does not produce a toxic gas during the process, and is suitable for producing a large scale film at a low production cost.

Preparation of thin film for solar cell using paste

A sulfur dioxide absorbent comprising an ionic liquid comprised of alkyl ether-substituted imidazolium cation and an alkanesulfonate anion moieties possesses a high thermal/chemical stability, high SOabsorption rate and low regeneration temperature, and is useful for an effective separation of SOfrom a combustion exhaust gas mixture or the like.

Sulfur dioxide absorbent comprising ionic liquid

The present invention relates to a method for separation and recycling of pure sulfur dioxide from a gaseous mixture in the IS cycle. More specifically, the present invention relates to a method for separation and recycling of pure sulfur dioxide from a gaseous mixture in the IS cycle using an ionic liquid under a specific condition. When compared with the conventional amine-based absorbent, the use of the ionic liquid enables continuous absorption and stripping of SOeven at high temperature, and enables a reversible absorption of SOwithout loss, decomposition or degradation of a solvent due to good chemical stability, thereby enabling separation and recycling of pure SOfrom a gaseous mixture in the IS cycle.

Method for separation and recycle of pure sulfur dioxide from a gaseous mixture in is cycle with ionic liquids

Acetic ester is produced economically by a gas phase carbonylation of methanol with carbon monoxide followed by a transesterification. Specifically, the inventive process comprises (a) carbonylating methanol in a gas phase with carbon monoxide to produce a mixture of acetic acid and methyl acetate; (b) separating from the production mixture the acetic acid, and a mixture of the methyl acetate and the co-catalyst; (c) further separating said methyl acetate and the co-catalyst and recycling the separated co-catalyst to the carbonylation reactor; (d) introducing the separated methyl acetate into a lower region of a transesterification reactor at a temperature of above its boiling point; (e) introducing an C.sub.2 or higher alcohol into an upper region of the trans-esterification reactor at a temperature of up to its boiling point; (f) transesterifying the methyl acetate with the alcohol in the presence of an acid catalyst to produce a mixture containing acetic esters; and (g) recovering the acetic esters from the mixture as a bottom product while recycling the unreacted methyl acetate and methanol to the carbonylation reactor or distillation column.

Process for the preparation of acetic esters from methanol

Ethanol is produced economically by a gas phase carbonylation of methanol with carbon monoxide followed by a hydrogenation. Specifically, the inventive process comprises:

Process for the preparation of ethanol from methanol

Growing community of inventors

Seoul, South Korea

Kwang Deog Jung