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보문: 공업화학(전기화학, 분석화학 포함),촉매/반응공학,약물전달기술,기능성 코팅기술 ; 열중량 분석법을 이용한 Deasphalted Oil의 열분해 특성 분석
신상철 ( Sang Cheol Shin ),이정무 ( Jung Moo Lee ),이기봉 ( Ki Bong Lee ),전상구 ( Sang Goo Jeon ),나정걸 ( Jeong Geol Na ),노남선 ( Nam Sun Nho ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3
기존 경질 원유 자원의 매장량 고갈과 중국, 인도 등 개발도상국에서의 에너지 수요가 급증하면서 원유 자원의 공급이 수요를 감당하지 못하는 상황이 벌어지고 있고, 따라서 상대적으로 활용도가 낮았던 중질유를 효율적으로 이용하는 방안이 대두되고 있다. 중질유를 활용하기 위해서는 경질화 과정을 거쳐야하는데, 특히 공정이 단순하고 경제적인 열분해 기술이 적합하다고 할 수 있겠다. 본 연구에서는 중질유의 열분해 특성 분석의 기초 자료를 얻기 위해 중질유에서 아스팔텐이 제거된 deasphalted oil(DAO)의 열분해 실험을 수행하였다. DAO는 solvent deasphalting 공정을 통하여 얻어지며 주로 탄소수가 20~40인 물질들로 이루어져 있는데, DAO의 열분해 반응 속도론적 분석 결과와 비교 분석하기 위해 DAO의 평균 탄소수를 갖는 탄소수 30의 단일 물질들(C30H62, C30H58O4S, C30H63O3P)을 선택하여 추가적인 열분해 실험을 수행하였다. 열분해 실험에서는 열중량 분석기를 이용하여 비등온 열분해 방법(10, 50, 100 ˚C/min)으로 실험을 진행하였고, 열분해 반응을 분석하는 방법으로는 가장 기초적인 Arrhenius 방법을 비롯하여Ingraham and Marrier 방법, Coats and Redfern 방법, Ozawa-Flynn-Wall 방법을 이용하였다. Arrhenius, Ingraham and Marrier, Coats and Redfern 방법으로 계산된 DAO의 열분해 반응 평균 활성화에너지 값은 72~99 kJ/mol이었다. 그리고 Ozawa-Flynn-Wall 방법으로 분석된 활성화 에너지에서는 전환율의 증가에 따라 DAO의 경우 그 상승 폭이 단일 물질들에 비해 크게 나타났다. The depletion of conventional oil reserves and the increasing energy need in developing countries such as China and India result in exceeding oil demand over supply. As a solution of the problem, the efficient utilization of heavy oil has been receiving more and more interest. In order to utilize heavy oil, upgrading processes are required. Among the upgrading processes, thermal decomposition is thought to be relatively simple and economical. In this study, to understand basic characteristics of thermal decomposition of heavy oil, we conducted pyrolysis experiments of deasphalted oil (DAO) produced by a solvent deasphalting process. DAO is a mixture of many components and consists mainly of materials of carbon number 20~40. For the comparison with results of DAO pyrolysis, additional pyrolysis experiments with single materials of carbon number 30 (C30H62, C30H58O4S, C30H63O3P) were conducted. Pyrolysis experiments were carried out non-isothermally with variation of heating rate (10, 50, 100 ˚C/min) in a thermogravimetric analyzer. Average pyrolysis activation energy determined by using Arrhenius method, Ingraham and Marrier method, and Coats and Redfern method was 72~99 kJ/mol. In the activation energy calculated by Ozawa-Flynn-Wall method, DAO had wider variation than other single materials.
박준우,Min Yong Kim,Soo Ik Im,고강석,Nam-Sun Nho,Ki Bong Lee 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Solvent deasphalting (SDA) is a heavy oil upgrading process that selectively extracts deasphalted oil(DAO) and rejects asphaltenes. In this study, a quantitative analysis was conducted to predict DAO yieldsin the SDA process using relative energy difference (RED); the RED was calculated from Hansen solubilityparameters (HSPs) of the feedstock and extraction solvent along with the extraction conditions, such astemperature and solvent-to-oil ratio (SOR). SDA extraction experiments were performed in a continuousbench-scale unit using vacuum residue (VR) and a mixture of bunker C fuel oil (BC) and VR as feedstocks. The HSPs of saturate, aromatic, resin, and asphaltene fractions derived from the VR and BC were measuredusing solubility tests, wherein the fractions were dissolved in 37 different solvents. Finally, simpleand accurate correlations between the DAO yield and corresponding modified RED were acquired andused to explain the effects of temperature and SOR on the DAO yield.
Separation of solvent and deasphalted oil for solvent deasphalting process
Lee, J.M.,Shin, S.,Ahn, S.,Chun, J.H.,Lee, K.B.,Mun, S.,Jeon, S.G.,Na, J.G.,Nho, N.S. Elsevier Scientific Pub. Co 2014 Fuel processing technology Vol.119 No.-
Due to the depletion of conventional oil resources and increasing prices, various technologies for utilizing unconventional oil and low-value crude residues, which have not been fully exploited, are currently being explored. The exploitation of unconventional oil and low-value crude residues requires upgrading processes such as carbon rejection and hydrogen addition. Among many existing upgrading processes, solvent deasphalting (SDA), a technology for removing asphaltene-rich pitch and producing higher-value deasphalted oil (DAO) by using paraffinic solvents, is promising because it offers the advantages of low installation cost and flexibility in terms of the control of the quality of pitch and DAO. The SDA process requires a considerable amount of expensive solvent. Thus, solvent recovery, an energy-intensive process, is required for improved efficiency. In this paper, DAO/solvent separation experiments were carried out using two solvents, pentane and hexane, to investigate the effect of operating conditions such as temperature, pressure, and DAO/solvent ratio on the process. The DAO/pentane separation was superior to the DAO/hexane separation under similar conditions. Regardless of the solvent type, solvent recovery was increased as the DAO/solvent ratio in the feed was decreased. Solvent recovery was strongly influenced by variations in temperature but was relatively insensitive to changes in pressure.
Im, Soo Ik,Shin, Sangcheol,Park, Jun Woo,Yoon, Hyung Jin,Go, Kang Seok,Nho, Nam Sun,Lee, Ki Bong Elsevier 2018 Chemical Engineering Journal Vol.331 No.-
<P><B>Abstract</B></P> <P>The solvent deasphalting (SDA) process is a heavy oil upgrading process in which deasphalted oil (DAO) is extracted from heavy oil feedstock by precipitating asphaltene using an excess amount of alkane solvent (C3-C6). After the extraction, solvent recovery should be carried out for separating the solvent from the DAO in order to recycle the expensive solvent. In the conventional solvent recovery method, the mixture of solvent and DAO is heated to evaporate the solvent, which requires massive heat energy, resulting in reduced process efficiency. In this study, CO<SUB>2</SUB> is applied for the first time to selectively separate solvent from DAO at a relatively low temperature. The experimental results in a batch separator indicate that the temperature required for high solvent recovery of over 80% decreases from 200°C to 40°C when using CO<SUB>2</SUB> compared to the conventional method. The theoretical approach using Hansen distance calculation based on the Hansen solubility parameter (HSP) was used to verify the mechanism of solvent separation using CO<SUB>2</SUB>. The results suggest that the increase in the interaction between CO<SUB>2</SUB> and solvent causes the separation of solvent from DAO, leading to an increase in solvent recovery. Also, numerical simulation results show the possibility of continuous operation for solvent recovery using CO<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Solvent recovery using CO<SUB>2</SUB> was newly developed for solvent deasphalting process. </LI> <LI> High solvent recovery was achieved at relatively low temperature. </LI> <LI> CO<SUB>2</SUB> acts as an anti-solvent to separate the solvent from DAO. </LI> <LI> Numerical simulation confirmed the possibility of a new solvent recovery operation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Subhash Kumar,Manoj Srivastava 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-
The aim of this work is to study melioration in mesophase formation behaviour by deasphalting ofpetroleum residues. Pitches prepared from VRs have undesirable high values of physico-chemicalproperties as compared to their corresponding DAOs pitches. This is due to presence of high molecularweight asphaltenes molecules in VRs. The optical microscopic images of VR-390-1 and VR-390-2 pitchesshowed that they have small sized, distorted and agglomerated types of mesophase having mesophasecontents (MC) 25 vol% and 22 vol% respectively but deasphalting of these VRs improve the growth andoptical texture of mesophase in DAO-390-1 (29 vol%) and DAO-390-2 (35 vol%).