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- 저자 : 하성용(Seong-Yong Ha) (검색결과 14 건)
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Low - Global Warming Potential 냉매를 이용한 에틸렌 수송선의 재액화 시스템 성능개선
하성용(Seong-Yong Ha),최정호(Jung-Ho Choi) 대한조선학회 2018 大韓造船學會 論文集 Vol.55 No.5
The development of sail gas has increased the production of ethane as well as natural gas. The decline in the market price for ethane has led to a change in the petroleum-based ethylene production process into an ethane-based ethylene production process and an increase in the ethane/ethylene trade volume. Large-scale ethane/ethylene carrier have been needed due to an increase in long-distance trade from the US, and cargo type change have leaded to consider a liquefaction process to re-liquefy Boil-Off gas generated during the voyage. In this paper, the liquefaction system of Liquefied Ethane Gas carrier was evaluated with Low-GWP (Low-Global Warming Potential) refrigerant and process parameters, Boil-Off Gas pressure and expansion valve outlet pressure, were optimized. Low-GWP refrigerants were propane (R290), propylene(R1270), carbon dioxide(R744) was considered at two type of liquefaction process such as Linde and cascade cycle. The results show that the optimal pressure point depends on the individual refrigerant and the highest liquefaction efficiency of carbon dioxide (R744) - propane (R290) refrigerant.
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1RE-8 : Preparation and Properties of Modified Poly(amide-imide) with Oligo dimethylsiloxane
하성용 ( Seong Yong Ha ),오부근 ( Boo Keun Oh ),이영무 ( Young Moo Lee ) 한국공업화학회 1993 한국공업화학회 연구논문 초록집 Vol.1993 No.0
Poly(amide-imide)(PAI) is an important class of tractable polyimide. However, PAI is difficult to process by conventional means. The properties of PAI can easily be altered by incoporating siloxane blocks into PAI main chain. Therefore, many researchers have focused on the synthesis of siloxane PAI copolymer(SPAI). Table 1 shows the recipe of the polymerization. Trimellitic anhydride acid chloride dissolved in THF dropped slowly into the mixture of phenylene diamine(PDA) and silicone diamine(SDA) mixture in THF under nitrogen atmosphere with vigorous stirring. The reaction was carried out for 1 day under N<sub>2</sub> atmostphere. The resulting polymeric solution was precipitated with acetone and the product was filltered. The product was dissolved in NMP and reprecipitated in distilled water for further purification. The silicone modified polyamide acid was dried in an oven for an imidization at 100, 150, 200 and 250°C. SPAIs were easily dissolved in NMP, DMAc and DMF. Methanol and toluene was non -solvents. SPAI film was prepared from casting SPAI solution onto glass plate and drying in an oven. The analysis of the structure of SPAIs was conducted by using FT-IR. The characteristic peaks of imide appeared 1778 and 1720cm<sup>-1</sup>. The stretching vibrations of amide showed at ca, 1720, 1650 and 1545cm<sup>-1</sup>. The characteristic peaks of Si-CH<sub>3</sub> appeared at 1260 and 860cm<sup>-1</sup> and that of Si-O show at 1090cm<sup>-1</sup>. In our study, the thermal properties, X-ray diffraction and mechanical properties of SPAIs were also disscussed.
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기획특집: Gas 분리 Membrane : OBIGGS용 기체분리막 개발동향
오대윤 ( Dae Youn Oh ),하성용 ( Seong Yong Ha ),이정무 ( Jeong Moo Lee ),김형준 ( Hyoung Juhn Kim ),남상용 ( Sang Yong Nam ) 한국공업화학회 2011 공업화학전망 Vol.14 No.3
최근 기체분리막에서 가장 크게 관심을 받고 있는 분야는 OBIGGS용 고투과 선택성 기체분리막이다. OBIGGS용 기체분리막 소재로 기존의 polysulfone 보다 내열성, 투과성, 선택성이 우수한 소재개발에 대한 연구가 이루어지고 있다. 내열성이 우수한 고분자 소재로는 PBI, PI, PBO, PBZ, PPy가 있으며 최근에는 미세 기공을 가지는 PIMs계 고분자 소재에 대한 연구가 활발히 진행되고 있다. OBIGGS용 기체분리막은 3개 미만의 업체에서 독점하고 있으며 프리미엄급 소재의 개발은 산업적, 경제적, 기술적인 측면에서 큰 파급효과를 일으키게 될 것으로 예상되며 따라서 국내의 기체분리막에 대한 연구가 활발히 이루어져야 할 것이다.
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폴리술폰 중공사막을 이용한 Flaring Gas에서의 이산화탄소 분리 및 전산모사
임주환,이충섭,김학은,배명원,모용기,하성용,Lim, Joo Hwan,Lee, Chung Seop,Kim, Hack Eun,Bae, Myong Won,Mo, Yong Gi,Ha, Seong Yong 한국막학회 2015 멤브레인 Vol.25 No.2
Flaring gas에서 $CO_2$ 제거를 위해 폴리술폰 고분자를 이용한 중공사막을 제조하였다. 제조된 중공사막은 1단과 2단 공정의 전산모사와 실제 공정을 통해서 $CH_4$ 농도 99% 이상 $CO_2$ 농도 1% 미만의 운전조건과 성능을 확인하였다. 또한 $25Nm^3/h$ 급 bench scale $CO_2$ 분리막 연속공정에서 100시간의 운전시간 동안 $CO_2$의 농도를 1% 미만으로 안정적으로 운전하였고 이때의 $CH_4$ 회수율은 약 98%였다. Polysulfone (PSF) hollow fiber membrane was prepared to separate $CO_2$ from the flaring gas. Fabricated PSF membrane system was fulfilled under 1 stage, 2 stage membrane process and simulation in order to confirm the operating condition for 99% of $CH_4$ and 1% of $CO_2$ concentration. Also, $25Nm^3/h$ bench scale $CO_2$ separation membrane system was operated under 1% of $CO_2$ concentration during 100 hr, and $CH_4$ recovery ratio was 98%.
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