Selective separation of solvent from deasphalted oil using CO₂ for heavy oil upgrading process based on solvent deasphalting

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>

Solvent recovery in solvent deasphalting process for economical vacuum residue upgrading

안선주,신상철,임수익,이기봉,노남선 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1

The solvent deasphalting (SDA) process is a heavy oil upgrading process and used to separate asphaltene, the heaviest and most polar fraction of vacuum residue (VR) of heavy oil, by using density differences, to obtain deasphalted oil (DAO). The SDA process consists of two main stages: asphaltene separation and solvent recovery. Solvent recovery is a key procedure for determining the operating cost of the SDA process, because it uses a considerable amount of costly solvent, the recovery of which consumes huge amounts of energy. In this study, the SDA process was numerically simulated by using three different solvents, propane, n-butane, and isobutane, to examine their effect on the DAO extraction and the effect of the operating temperature and pressure on solvent recovery. The process was designed to contain one extractor, two flash drums, and two steam strippers. The VR was characterized by identifying 15 pseudo-components based on the boiling point distribution, obtained by performing a SIMDIS analysis, and the API gravity of the components. When n-butane was used, the yield of DAO was higher than in the other cases, whereas isobutane showed a similar extraction performance as propane. Solvent recovery was found to increase with temperature and decrease with pressure for all the solvents that were tested and the best results were obtained for propane.

Application of gas anti-solvent process to the recovery of andrographolide from Andrographis paniculatanees

Manop Charoenchaitrakool,Wuttichai Trisilanun,Penjit Srinopakhun 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3

The gas anti-solvent (GAS) process was employed to extract andrographolide, which is the active ingredient found in Andrographis Paniculatanees, using carbon dioxide as an anti-solvent. The effects of temperature, flow rate and solvent type on the extraction recovery, particle size and morphology were investigated in this study. The experiments were conducted at the temperature ranging from 25-45 oC, carbon dioxide flow rate of 1-15 mL/min, and various types of organic solvents (methanol, ethanol, acetone and N,N-dimethylformamide). The extracted product was analyzed using high performance liquid chromatography (HPLC). The highest extraction yield was found to be 1.24 g andrographolide per 100 g of A. paniculata when using acetone as a solvent, carbon dioxide flow rate of 5 mL/min and the temperature of 35 oC. It was also found that no significant change in size or morphology of the precipitates was observed when changing temperature, carbon dioxide flow rate and solvents.

Application of a Non-halogenated Solvent, Methyl Ethyl Ketone (MEK) for Recovery of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(HB-co-HV)] from Bacterial Cells

양영헌,전종민,이다혜,김정호,서형민,Cho Kyun Rha,Anthony J. Sinskey,Christopher J. Brigham 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.2

Conventional solvent-based methods are still the most practical approaches for recovery of polyhydroxyalkanoate (PHA) polymer from cellular biomass, even though potential alternatives exist, including chemical, mechanical, and enzymatic methods. It is still necessary, however, to avoid dangerous and environmentally unfriendly solvents (e.g., chloroform and dichloromethane) in the polymer recovery process. In the work presented here, we applied various solvent systems to recover PHA from Ralstonia eutropha and recombinant Escherichia coli cells. It was demonstrated that methyl ethyl ketone (MEK) is a promising solvent for PHA recovery from bacterial cells, particularly for the copolymer poly(hydroxybutyrate-cohydroxyvalerate) [P(HB-co-HV)], exhibiting > 90% polymer recovery. Even though MEK did not solubilize PHAs to the same extent as chloroform, it can recover a comparable amount of polymer because of its processing advantages, such as the low viscosity of the MEK/PHA solution, and the lower density of MEK as compared to cellular components. MEK was found to be the best alternative, non-halogenated solvent among examined candidates for recovery of P(HB-co-HV) from cells. The MEK treatment of PHAcontaining cells further allowed us to eliminate several costly and lengthy steps in the extraction process, such as cell lysis, centrifugation, and filtration.

Recovery of Zinc in Spent Pickling Solution with Oxalic Acid

( Kyung-ran Lee ),( Jeongsook Kim ),( Jeong-gook Jang ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.6

To collect zinc, Fe and Zn in spent pickling solution were extracted by using TBP (tributyl phosphate), and Zn was recovered from extracted solution to zinc oxalate particles by oxalic acid solution. The reusability of TBP sol-vent was also tested. The distribution coefficient of Zn was not affected by the concentration of Fe in spent pickling solution, almost constant with the values of 7.12~9.31 when extracted by TBP solvent. It was found that the extraction capacity of TBP solvent for Zn is higher than that for Fe. The extraction efficiency of Zn was higher than 95%, while most of Fe was left in aqueous phase. After the recovery, the used TBP solvent could be repeatedly reused for the extraction of Zn up to eight times. XRD analysis showed that zinc oxalate (ZnC₂O₄ 2H₂O) was formed from the reac-tion of Zn-TBP and oxalic acid. From the results of SEM analysis, the formation of zinc oxalate particle was strongly affected by the concentration of oxalic acid. In summary, Zn in spent pickling solution was successfully separated and recovered with TBP solvent and oxalic acid solution, respectively.

Injection of hot urea solutions as a novel process for heavy oil recovery A proof-of-concept experimental study

Mabkhot BinDahbag,Mohsen Zirrahi,Hassan Hassanzadeh 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-

We report a proof-of-concept experimental study of hot urea solutions injection as a new recoveryprocess to extract highly-viscous oils. Eightflooding experiments were conducted to study the viability ofhot urea solutions in displacing bitumen from cold sandpacks. Three injection rates (4, 8, and 12 cm3/min), four injection temperatures (180, 200, 220, and 240 C), and three urea solution concentrations (5,10, and 15 wt%) were investigated. Another baseline experiment was conducted with fresh water forcomparison with the urea solution scenarios. The results showed that the injection of hot urea solutioninto cold sandpack saturated with bitumen lead to a significant increase in the oil recovery due to theformation of in-situ water-in-oil emulsions. The results also reveal that the balance of the retention timeand the amount of heat delivered to the sandpack leads to an optimum injection rate at which the oilrecovery is improved considerably. Additionally, while the increment in injection temperatureaccelerates oil production, it decreases the ultimate oil recovery. These results pave the way forimproving the existing recovery techniques and introducing chemical in-situ oil recovery processes forreservoirs that are not currently exploitable using existing recovery techniques.

오일샌드 플랜트 하이브리드 스팀-솔벤트 회수방식의 중앙처리시설 분석 및 경제성 분석

정진홍 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.3

Heavy bitumen scattered in the underground sedimentary layer is a kind of unconventional energy source, and by extracting it, a production well is excavated in the sedimentary layer and high-temperature and high-pressure steam is injected to reduce the viscosity of bitumen and recover it to the ground steam assisted method is applied. As a recovery method that uses the steam effect of the dilution effect of solvent injection, it is a recovery method that can increase thermal efficiency. In this study, the process system of the central processing facility(CPF) of the hybrid steam-solvent recovery method that injects solvent into the existing steam assisted method was analyzed, and the core facilities for each process were identified, and hybrid steam-solvent recovery compared to the existing steam assisted method. In the case of the method, it was evaluated that the amount of steam supply and all utility costs decreased according to the solvent injection.

폐 LCD 유리로부터 인듐 용출 및 농축에 관한 연구

김미소 ( Miso Kim ),백금지 ( Geumji Back ),변은경 ( Eun Kyung Byun ),이유림 ( You Lim Lee ),최예지 ( Yeji Choi ),장정원 ( Jungwon Chang ),홍현선 ( Hyun Seon Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2019 No.-

ITO (Indium Tin Oxide) transparent electrode of after used LCD, contains indium oxides, which is classified as an expensive rare metal. Therefore, LCD recycling is becoming an important issue in terms of solving environmental problems and securing resources. Followed by dismantling of waste LCD, for hydrometallurgical indium recovery from LCD through solvent extraction is the rudimentary stage. The determination of optimum conditions is rather essential from efficient solvent extraction process development perspective. Hence, solvent extraction efficiency of indium as function of leachant(A)/extractant(O) ratio, extractant(O)/stripping reagent(A') ratio and reaction temperature were investigated. Through our investigation, A/O and O/A' ratio varies from 1 to 8, reaction temperature varies from 25℃(RT) to 80℃. As extractant and stripping reagent, D2EHPA and HCl were used, respectively.

Effect of water content of organic solvent on microwave-assisted extraction efficiency of paclitaxel from plant cell culture

Ji-Yeon Lee,김진현 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.7

A microwave-assisted extraction (MAE) method was used to recover the anticancer agent paclitaxel from plant cell cultures, and the extraction efficiency of the paclitaxel was determined using various organic solvents (acetone,chloroform, ethanol, methanol, and methylene chloride) and solvent concentrations. Methanol provided the highest recovery of paclitaxel (~93%) and resulted in the most severe rupturing of the biomass surface during MAE. Most of the paclitaxel (>99%) was recovered using a methanol concentration of 90% (water content: 10%), suggesting that the addition of a small amount of water improves the efficiency of MAE. Furthermore, analysis of the surface of the biomass using an electron microscope revealed that the higher the recovery of paclitaxel, the more severe the damage to the biomass surface. A comparison of the extraction efficiency between MAE and conventional solvent extraction (CSE)showed that with CSE, only up to 54% of the paclitaxel could be recovered in one extraction whereas with MAE, most of the paclitaxel (>99%) in the biomass could be recovered in one extraction.

Distillation design and optimization of quaternary azeotropic mixtures for waste solvent recovery

Chaniago, Yus Donald,Lee, Moonyong Elsevier 2018 Journal of industrial and engineering chemistry Vol.67 No.-

<P><B>Abstract</B></P> <P>The huge amount of solvents used in the semi-conductor and display industry typically result in waste of valuable solvents which often form complex azeotropic mixtures. This study explored a recovery process of a quaternary waste solvent, comprising methyl 2-hydroxybutyrate, propylene glycol monomethyl ether acetate, ethyl lactate, and ethyl-3-ethoxy propionate. In this study, a novel shortcut column method with a graphical approach was exploited for the distillation column design of complex quaternary azeotropic mixtures. As a result, the proposed shortcut method and design procedure solved the complex separation paths successfully with less computational efforts while achieving all requirements for component purity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effective waste solvent recovery from semiconductor and display industries. </LI> <LI> Simple distillation design procedure for quaternary azeotropic mixtures by exploiting a shortcut method. </LI> <LI> Novel graphical design method for complex separation of column paths. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>