Abstract:
본 발명은 티타니아에 담지된 텅스텐계 촉매를 이용하여 고수율로 퍼퓨랄을 제조하는 방법에 관한 것으로, 구체적으로는 자일로오즈 또는 헤미셀룰로오즈를 원료로 사용하여 퍼퓨랄을 제조하는 방법에 있어서, 초임계 유체를 포함하는 반응 매질 내에서 티타니아 지지체에 이소폴리텅스테이트(isopolytungstate)을 담지시킨 고체산 촉매체를 이용하여 원료를 퍼퓨랄로 전환시키는 단계(단계 1) 및 상기 반응 매질에 초임계 유체를 분사하여 퍼퓨랄을 추출 및 분리 시키는 단계(단계 2)를 포함하는 고수율로 퍼퓨랄을 제조하는 방법을 제공한다. 본 발명에 따른 퍼퓨랄 제조방법은 열적 안정성과 화학적 안정성이 우수한 텅스텐계 고체산 촉매를 이용하여 퍼퓨랄을 제조하여, 수율이 우수하면서도, 촉매손실율이 적어 퍼퓨랄의 제조단가를 감소시켜 퍼퓨랄 제조에 유용하게 사용할 수 있다. 고체산(solid acid), 초임계 유체(supercritical fluid), 퍼퓨랄(furfural), 티타니아(Titania), 이소폴리텅스테이트(isopolytungstate)
Abstract:
PURPOSE: A producing method of furfural is provided to improve the yield of the furfural, to reduce the fabrication cost of the furfural, and to reduce the catalyst loss rate. CONSTITUTION: A producing method of furfural using xylose or hemicellulose as a raw material comprises the following steps: converting the raw material into the furfural using a solid acid catalyst body deposited with isopolytungstate to a gamma-alumina supporting body inside a reaction medium including supercritical fluid; and extracting or separating the furfural by spraying the supercritical fluid to the reaction medium. The supercritical fluid is either supercritical carbon dioxide, or supercritical propane.
Abstract:
A method and an apparatus for evaluating performance of heterogeneous catalysts are provided to evaluate the performance of a catalyst acting on the elementary reaction to be evaluated objectively, by separating the reaction product progressing the side reaction easily from its environment by inducing supercritical fluid to a heterogeneous catalytic reaction system. An apparatus for evaluating performance of heterogeneous catalysts comprises a supercritical fluid supply device(100), catalytic reactor(300) and recovery device(400). The supercritical fluid supply device supplies the supercritical fluid. The catalytic reactor causes the reaction by a catalyst in a state that reaction raw materials are injected, and discharges the reaction products through a fluid supply tube of the supercritical fluid supply device. The recovery device separates and recovers the liquefied reaction products from the supercritical fluid by being supplied with the supercritical fluid dissolved with the reaction products.
Abstract:
A method for separating acetone is provided to reduce waste treatment costs of an organic solvent generated in a manufacturing process of water soluble polyurethane and to save the production costs of a manufacturing process of water soluble polyurethane by recycling the refined organic solvent. A method for separating acetone comprises a step for distilling a waste acetone compound to be a moisture content of 0.1-5 wt.%; a step for producing an amine salt by neutralizing the distilled waste acetone mixture with an organic acid; and a step for separating and collecting the acetone by distilling the reaction mixture containing the amine salt.
Abstract:
PURPOSE: A new combustion supporting catalytic liquid composition is provided to greatly improve complete solution stabilization and combustion dust suppressing functions of the composition by selecting a particular aromatic solvent as a primary base solvent, thereby enabling solubilization and stabilization at the same time. CONSTITUTION: In a combustion supporting catalytic composition for suppressing combustion dust containing ferrocene, the combustion supporting catalytic liquid composition for suppressing combustion dust is characterized in that the composition comprises 60 to 90 wt.% of aromatic solvent as a primary base solvent, and 1.0 to 12.0 wt.% of ferrocene as a combustion supporting catalyst, wherein the primary base solvent is C9 aromatic distillate of petrochemical process or mixed solvent of aromatic hydrocarbons prepared by using the C9 aromatic distillate of petrochemical process as raw material, wherein the primary base solvent is mixed xylene distillate comprising ethyl benzene and meta-xylene, wherein the primary base solvent comprises meta-xylene, wherein the primary base solvent includes benzene, and includes toluene and alkyl benzene at the same time, wherein the primary base solvent comprises 10 to 25 wt.% of alkyl benzene for the weight of benzene and 45 to 85 wt.% of toluene for the weight of benzene at the same time, and wherein the combustion supporting catalytic composition comprises aliphatic solvent as well as aromatic solvent as solvent constituents.
Abstract:
본 발명은 톨루엔디아민의 제조 회수방법에 관한 것으로서, 더욱 상세하게는 톨루엔디아민(TDA)을 포스겐화하여 톨루엔디이소시아네이트(TDI)를 제조하는 화학 공정에서의 부반응 생성물로 얻어지는 고비점 타르(tar) 폐기물을, 물의 임계 온도와 임계 압력 전후의 고온 고압의 화학 반응 조건에서 암모니아 수용액을 반응성 매질로 사용하여 분해하여 고가의 원료 톨루엔디아민(TDA)으로 전환하여 제조 회수하는 방법에 관한 것이다. 이로써 본 발명에 따른 방법은 폐기물 처리 비용을 절감하고 매립지 부족 문제를 완화할 수 있으며, 궁극적으로는 톨루엔디이소시아네이트(TDI) 제조 공정의 경제성을 제고할 수 있다.
Abstract:
PURPOSE: A maintenance of membranes by prefiltration at high pressure and by cleaning their microstructures with supercritical fluids is provided, in which contamination of main separation membrane is minimized by cleaning the pre-treatment filtration media, with the cleaning being conducted by stabilizing and forcibly adsorbing the hydrophilic or hydrophobic contaminants at high pressure of 2 to 20 atm higher than the saturation pressure of bubble. And the regeneration of main separation membrane is conducted within a shortened time by washing the surface and pore inside of the separation membrane by using supercritical fluids without any restrictions of sort, figure, process concerning with the separation membrane. CONSTITUTION: The method comprises two steps of minimizing contamination of the pre-treatment separation membrane and regeneration performance of the main separation membrane. The minimization method comprises stabilizing the subject material to separate at a state of 2 to 20 atm higher than the saturation pressure of bubble at the pre-treatment filter media consisting of the same separation membrane or similar material from the hydrophilic or hydrophobic point of view followed by forcible adsorption. The regeneration method of performance of the separation membrane comprises washing the surface and pore inside of the separation membrane by using supercritical fluid of supercritical carbon dioxide or reformed supercritical fluid reformed by methanol, ethanol, and isopropanol followed by drying.