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최재환,남희근,문성용 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
For a biotechnological process of succinic-acid (SA) production, one of the essential requirements forensuring its economical feasibility is to establish an effective way for an economical separation of SA(target product) from other fermentation-sourced organic acids (by-products). For this purpose, weinvestigated the optimal design of a 3-zone simulated moving bed (SMB) process for the SA separationthat could be operated under overloaded conditions. This work began by determining the intrinsicparameters of SA and other organic acids in a Langmuir-isotherm region, which were then used to clarifya proper set of feed concentration and port-arrangement mode that can be favorable for both SA yield andSA productivity.
Adsorption behaviors of sugars and sulfuric acid on activated porous carbon
박경목,남희근,이기봉,문성용 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
To investigate the suitability of activated porous carbon as the adsorbent for separation of sugars andsulfuric acid, the relevant adsorption equilibrium data were obtained by using a staircase frontal analysismethod in the range of sulfuric acid concentration (0–13.61 g/L), glucose concentration (0–5.86 g/L), andxylose concentration (0–34.96 g/L). It was found from the resultant adsorption data that sugars hadconsiderably higher adsorption affinities to activated porous carbon than sulfuric acid, which indicatesthat activated porous carbon has the potential to be utilized as an economical adsorbent for separation ofsugars and sulfuric acid. It was also found that the resultant adsorption data could be well predicted bythe Langmuir isotherm model.
Size distribution of cassava powder and insoluble solid reduction after liquefaction
박종명,남희근,전상준,송효학 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
2,3-Butanediol (2,3-BD) can be produced from simultaneous saccharification and fermentation of liquefied cassava powder using Klebsiella oxytoca. As the performance of filtration in downstream processes can be reduced by insoluble solid, the insoluble solid content should be minimized. Characterization of cassava powder and its liquefied solution was carried out to investigate if insoluble solid can be reduced after liquefaction process. Cassava powder showed wide size distribution between 0.4 ~ 1,700 ㎛ and particles less than 45 ㎛ comprised about 54 wt%. Sugar contents inversely increased with particle size and reduction of solid contents after liquefaction was inversely proportional to the sugar content trend. Ruling out particle larger than 600 ㎛ can be reasonable choice to reduce solid contents. **This work was supported by the Industrial Strategic Technology Development Program (No. 10050407) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
박경목 ( Kyong Mok Park ),남희근 ( Hee Geun Nam ),문성용 ( Sung Yong Mun ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.1
본 연구에서는 활성탄을 흡착제로 사용하여 아세트산의 흡착 평형 실험을 313.15, 323.15 K에서 수행하였다. 아세트산의 흡착평형 데이터를 Langmuir, Bi-Langmuir, Freundlich model로부터의 계산 결과와 비교하였다. 이 과정에서 각 model 내 isotherm parameter는 실험값과 계산값의 차이의 제곱의 합을 최소화하는 방식으로 결정하였다. 비교 결과활성탄상에서의 아세트산의 흡착평형 데이터를 가장 잘 설명해주는 model은 Bi-Langmuir model이었음을 확인하였다. In this study, the adsorption equilibria of acetic acid on activated carbon were investigated at the temperatures of 313.15 K and 323.15 K. The obtained adsorption data were then fitted by Langmuir, Bi-Langmuir, and Freundlich models, in which the relevant model parameters were determined by minimizing the sum of the squares of deviations between experimental data and calculated values. The comparison results revealed that Bi-Langmuir model could account for the adsorption equilibrium data of acetic acid with the highest accuracy among the three adsorption models considered.