Editor’s Choice
NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 37, No. 5, 2019 … 675 Korean Journal of Chemical Engineering,
Vol.36, No.8, 1209-1225, 2019
An overview of nanomaterials for industrial wastewater treatment Abdelbasir SM, Shalan AE
Abstract - Industrial wastewater is a universal environmental issue. Numerous organic pollutants, heavy metals, and non- disintegrating materials are present at extreme concentrations. Presently, removing these pollutants from industrial wastewater in an effective way has become a momentous issue. Efficient purification procedures are needed to remove those pollutants before disposal. In this direction, wastewater treatment has been one of the nanomaterial applications.
Additionally, nanomaterials are innovationally effective for purifying water by using low-budget nanoadsorbents and nanofiltration. This review article highlights the use of nanomaterials for the removal of different polluting materials from industrial wastewater with a special focus on metal and metal oxide nanomaterials (NMs), carbonbased nanomaterials (CNMs) and nanofiber/nanocomposite membranes. The goal is to offer a recent overview and references in the area of emergent nanomaterials used for removing toxic pollutants from real industrial wastewater for researchers and industrializers.
Korean Journal of Chemical Engineering, Vol.36, No.8, 1226-1234, 2019
Hydrodesulfurization via heat exchanger network synthesis for ultra-low-sulfur diesel Ryu HW, Kim NG, Kang SO, Oh M, Lee CH
Abstract - In recent decades, the oil refining industry’s interest has been geared toward the production of clean fuels that contain fewer impurities such as sulfur and nitrogen compounds. Diesel hydrodesulfurization (DHDS) employed in light gas oil production has been widely applied to remove various impurities such as sulfur, nitrogen, and metalorganic compounds. In this study, the hydrodesulfurization process for the production of ultra-low sulfur diesel was simulated using the Aspen HYSYS hydroprocessing bed module. Then, exergy analysis was conducted. Since the exergy analysis indicated possible energy savings on the conventional DHDS, heat exchanger network (HEN) synthesis was applied to the process.
By replacing the heater and cooler with two heat exchangers, 5% of utility energy could be saved compared to the conventional process. Since the modification was relatively simple, the developed HEN synthesis is feasible in the present DHDS.
Korean Journal of Chemical Engineering, Vol.36, No.8, 1258-1266, 2019
Density functional theory study of NOx adsorption on alkaline earth metal oxide and transition metal surfaces
Lim JY, Kim KH, Kim EY, Han JW
Abstract - Since the emissions of nitrogen oxides (NOx) from automobiles cause air pollution, NOx storage-reduction
(NSR) catalyst has been used to convert the NOx into harmless components such as N2 through the reduction of NOx. In
this study, to provide fundamental understanding of key elementary steps of NSR, we established an extensive database for
the adsorption properties of NO and NO2 on a wide range of metal and metal oxide surfaces. Our results show that the
amount of charge transfer between NOx and surface is closely related to the molecular adsorption strength of NOx, and it
changes the molecular stability of NOx on the surfaces by enlarging the inner bond length of N-O. Understanding the
adsorption energy of the molecules or atoms that would participate in the reaction can be important to predict the ability of
NOx storage and conversion in NSR. This study provides a useful insight for designing metals or metal oxides for NSR
catalyst.
Editor’s Choice
676 … NICE, 제37권 제5호, 2019
Korean Journal of Chemical Engineering, Vol.36, No.8, 1291-1297, 2019
NH
3-induced removal of NOx from a flue gas stream by silent discharge ozone generation in a double reactor system
Hwang YJ, Farooq A, Park SH, Kim KH, Lee MH, Choi SC, Kim MY, Park RS, Park YK
Abstract - NOx, a generic term for the nitrogen oxides generated from combustion in the presence of nitrogen, is a serious threat to human health. This study examined the removal of NOx using ammonia (NH3) and ozone produced using a silent discharge method. The effects of temperature and residence time on NOx removal with NH3 injection in a double reactor system were investigated. An increase in temperature resulted in higher levels of O3 decomposition, whereas the maximum particle formation in the form of ammonium nitrate (NH4NO3) was achieved when both reactors were kept at 180 °C.
NH3 and O3 injection in large quantities and NO in smaller amounts with a residence time of 10.2 s resulted in the maximum particulate formation. In contrast, when an excess of NH3 was supplied, it resulted in N2O formation due to the formation of NH2 radicals generated from a reaction of NO2 with NH3. In addition, 100% NO removal was achieved regardless of the residence time. Kinetic simulations indicated the possibility of moisture being the limiting reactant.
Korean Journal of Chemical Engineering, Vol.36, No.9, 1389-1400, 2019
The role of membrane technology in acid mine water treatment: a review Agboola O
Abstract - The activities of mining industries are attracting more scrutiny as the concern of limitations of conventional technology for wastewater treatment and the potential use of wastewater have resulted in accelerated attention in membrane technologies. The paucity of water and industrial environmental guidelines has resulted in the application of membrane technologies in wastewater treatment, especially in the mining industry. Although many conventional physical and chemical processes have been employed to treat acid mine drainage (AMD), they have, however, demonstrated low efficiency and high cost. Membrane technologies have proven to be an important part in the treatment of AMD in order to reduce water paucity. Apart from addressing water paucity, membrane technologies meet high-level application with respect to ease of use, adaptability and environmental impacts. This paper reviews the use of membrane in the published literature for the treatment of acid mine waters and, for the recovery of valuable metals from acid mine drainage effluents.
The role of membrane technology in acid mine water treatment is discussed together with the factors that determine membrane performance for AMD treatment. The challenges of membrane technology in acid mine water treatment were reviewed and some solutions to the challenges are presented.
Korean Journal of Chemical Engineering, Vol.36, No.9, 1518-1526, 2019
Synthesis of InP nanocrystals using triphenyl phosphite as phosphorus source Lee DK, Koh SJ, Yoon DE, Lee SH, Kim WD, Kim DI, Bae WK, Lim JH, Lee DC
Abstract - Commercially viable synthesis of InP nanocrystals (NCs) involves highly pyrophoric phosphorus (P) precursor,
tris(trimethylsilyl) phosphine (TMS3P). Finding a cheap and safe alternative would be the holy grail. We report the
synthesis of InP NCs using triphenyl phosphite, an inexpensive and relatively safe phosphorous source. By reacting indium
chloride and triphenyl phosphite, we obtained large-sized and black-colored InP NCs, yet without any distinct feature that
shows quantum confinement effect. Addition of ZnCl2 resulted in InP NCs with controlled size, which was manifested in
the shift of 1S peak in absorption spectra. By coating ZnS shell on InP NCs, we achieved photoluminescence with some
extent of trap emission, showing maximum total quantum yield (QY) of 23% (8% of band-edge emission QY). We used
31P nuclear magnetic resonance (NMR), diffusion-ordered spectroscopy (DOSY), and mass spectrometry (MS) to assign
intermediates and following mechanisms of the InP synthesis using triphenyl phosphite. The development of this safe and
cost-effective P precursor opens broader opportunity space for large-scale production of InP NC.
Editor’s Choice
NEWS & INFORMATION FOR CHEMICAL ENGINEERS, Vol. 37, No. 5, 2019 … 677 Korean Chemical Engineering Research,
Vol.57, No.4, 461-468, 2019
금속필터를 사용한 석탄가스화 분진 및 표준 분진의 집진 효율과 운전특성
Dust Removal Efficiency and Operation Characteristics of Metal Filters for Coal Gasification Fines and Standard Dust Sample
윤용승, 정석우, 이승종
Abstract - 석탄화력발전소에서 발생하는 분진 효율을 높이고 미세먼지와 극미세먼지까지 집진할 필요성이 높아지고 있다. 상압 영역에서 운전되는 플랜트 발생 분진 제거를 위해서는 백필터나 전기집진기를 사용하나, 고온고압에서 운전되는 석탄가스화와 같은 경우는 금속필터나 세라믹필터가 사용된다. 고온고압에서 분진 집진을 위해 2종의 5겹 압착/소결한 금속필터를 제작하였고 이를 사용했을 때 분진 포집효율과 10 μm 이하 입자에 대한 포집 성능을 파악하였다. 석탄가스화 분진에 대한 금속필터의 집진효율은 무게기준으로 99%대에 달하였다. 제작한 금속필터 2종의 미세먼지 입자 이하(< 2.5 μm) 크기까지 집진성능을 파악하고자 JIS 분진 표준시료를 대상으로 실험을 수행하였고, 1~2.5 μm 입자크기 범위에 대해 97%와 70~82%의 집진 성능을 확인하였다. 1 μm 이하 입자크기 영역에서는 입자크기가 작아짐에 따라 제작한 금속필터의 집진효율이 급격히 낮아짐을 볼 수 있었다. 이러한 1 μm 이하 입자들에 대한 집진 제한점을 극복하고자 금속필터 성능의 개선 방안을 제시하였다.
Korean Chemical Engineering Research, Vol.57, No.4, 492-500, 2019
순환 유동층 보일러에서 석탄 연소 시 Borax Solution이 연소 배가스중 미세먼지 저감에 미치는 영향
The Effect of Borax Solution on the Reduction of Fine Particles in Flue Gas at a Commercial Circulating Fluidized-bed Boiler Firing Bituminous Coal
박재혁, 이동호, 배달희, 최유진, 류환우, 김지봉, 한근희, 선도원
Abstract - 본 연구에서는 9.2 MWe의 상용규모 순환유동층 보일러에서 화학첨가제 사용에 따른 미세입자 저감에 대한 영향을 확인하였다. 또한 화력 발전소에서 화석연료의 연소 중 발생하는 미세입자를 포집하기 위하여 간단하고 효과적인 포집설비를 개발하였다. 연소 배가스 중 PM 10이하의 입자를 감소시키기 위하여 화학첨가제를 사용하였으며, 사용한 화학첨가제는 borax solution을 사용하였다. 포집된 미세입자 중 PM 10이하의 입자 거동을 확인하기 위하여 입도분석기와 SEM 분석을 통해 확인하였다. Borax solution은 배가스중에 용융된 미네랄을 흡수하여 미세입자를 성장시키는 경향이 있는 것을 알 수 있었다. 결과적으로 borax solution을 사용함으로써 10 μm 이하의 미세입자가 감소되었음을 확인할 수 있었다.
Korean Chemical Engineering Research, Vol.57, No.4, 539-546, 2019
해수 농축수 내 금속 이온 농도에 따른 이산화탄소 전환 생성물의 특성연구