Noncatalytic liquefaction of tar with low-temperature hydrothermal treatment

Diono, Wahyu; Sasaki, Mitsuru; Goto, Motonobu

doi:10.1007/s10163-007-0174-0

Cited by 12 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[2][3][4][5][6][7][8][9][10] Wet air oxidation at high temperatures and pressures can be operated at conditions below or above the critical point of water (T c = 374.2°C and P c = 22.1 MPa). Water near the critical point possesses properties very different from those of ambient liquid water: the dielectric constant is much lower and the number and persistence of hydrogen bonds are both diminished.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of guaiacol in sub- and supercritical water and its kinetic analysis

Diono

Sasaki

Goto

2011

J Mater Cycles Waste Manag

Self Cite

View full text Add to dashboard Cite

The conversion of biomass waste into resources as a recycling process is receiving increased interest due to the perceived need for a sustainable global carbon cycle and environmental considerations. Several treatment processes are being developed. Hydrothermal treatment is one of the most effective approaches, because water at high temperatures and high pressures behaves as a reaction medium with remarkable properties. In this work, the reaction behavior of guaiacol as a biomass model compound was studied in subcritical water at 483-563 K and in supercritical water at 653-673 K using a batch reactor. Guaiacol can be considered representative of the aromatic ring structures present in lignin, a major component of woody biomass. The chemical species formed in aqueous products were identifi ed by gas chromatography/mass spectrometry and quantifi ed using high-performance liquid chromatography. The effect of pressure and reaction time on the conversion process of guaiacol is discussed. The results obtained indicate that this method has potential for effi cient organic waste conversion.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of guaiacol in sub- and supercritical water and its kinetic analysis

Diono

Sasaki

Goto

2011

J Mater Cycles Waste Manag

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thermal reactions of heavy oil have been studied in SCW, showing that two major reactions occur under supercritical conditions: oxidation and hydrolysis [57][58][59]. These reactions allow tar to be decomposed successfully into useful chemical compounds in SCW [60,61]. Hu et al [62] treated oil shale using SCW showing a higher conversion and a larger oil recovery than toluene extraction process.…”

Section: History Of Scfmentioning

confidence: 99%

Total Acid Number Reduction of Naphthenic Acids Using Supercritical Fluid and Ionic Liquids

Mandal¹,

Sasaki²

2018

Recent Insights in Petroleum Science and Engineering

Self Cite

View full text Add to dashboard Cite

Naphthenic acids (NAs) are complex mixture of predominately alkyl-substituted cycloaliphatic carboxylic acids and small amount of acyclic acids present in crude oil, heavy oil and in oil sands bitumen. They are toxic components in reinery wastewater and in oil sand extraction water and lead to corrosion problems within the oil reineries. Therefore, the amount of NAs needs to suppress in petroleum oils and wastewater came from petroleum industry. This paper reviews the supercritical luids (SCFs)-and ionic liquids (ILs)-based acidity reduction process from heavy oils by reviewing open literature. The potential beneits of SCFs-and ILs-based acidity reduction process of heavy oils are also explored. The reviewed articles reveal that total acid number (TAN) removal increase with increasing reaction time and temperature by the action of SCF. Supercritical methanol (SC-MeOH) has higher potentiality for removing acidity of NAs than supercritical water (SCW) without deposition of coke. TAN removal from NAs using SCF follows irst order kinetics on TAN removal. ILs can reduce acidity of heavy oil either forming zwitterionic species or building cage structure around NAs through speciic chemical bonds. Thus, non-catalytic SCF-and ILs-based TAN reduction process can open a new window to reduce acidity of heavy oils.

show abstract

“…The first common advantage of using water as solvent for clean technology is the opportunity to directly utilize water-soluble compounds and renewable materials [8][9][10][11][12]. They reported that high temperature water provided the possibility of directly modifying water-soluble and renewable materials in water without the necessary protectiondeprotection sequences that are commonly associated with conventional chemistry, thus reducing the overall synthetic steps.…”

Section: Introductionmentioning

confidence: 99%

Reaction of pyrrole induced pulsed discharge plasma over a water surface and supercritical water

Diono

Kiyan

Sasaki

et al. 2011

TENCON 2011 - 2011 IEEE Region 10 Conference

Self Cite

View full text Add to dashboard Cite

Electric field generated by pulsed high-voltage discharge plasma over water surface has been performed under high-pressure argon environments to convert pyrrole compound. In this work, oligomerization of pyrrole in water as a reaction media and the effects of various parameters with pulsed highvoltage arc discharge plasma are studied. Such as plasma applied under hydrothermal conditions generates high-energy electrons, ions, and radicals, which in turn may generate new reaction fields, leading to effective organic compounds oxidation for both homogeneous and heterogeneous reactions. Here, we utilize pulse discharge plasma over water surface to study the removal characteristics for pyrrole into more valuable higher amines group which has more fascinating for both the industry and the scientific community. In comparison, the reaction of pyrrole was also conducted in supercritical water at temperatures of 698-748 K and pressure of 30 MPa. The experiments were conducted at 313 K and 1 -2 MPa using a batch type reactor. Intermediate compounds from the conversion of pyrrole in the aqueous products were identified by GC-MS (gas chromatography mass spectrometry) and quantified using high performance liquid chromatography (HPLC). The conversion of pyrrole could approach to 25 % and 80 % after treatment by pulsed discharge plasma and supercritical water, respectively.

show abstract

Noncatalytic liquefaction of tar with low-temperature hydrothermal treatment

Cited by 12 publications

References 14 publications

Thermal decomposition of guaiacol in sub- and supercritical water and its kinetic analysis

Thermal decomposition of guaiacol in sub- and supercritical water and its kinetic analysis

Total Acid Number Reduction of Naphthenic Acids Using Supercritical Fluid and Ionic Liquids

Reaction of pyrrole induced pulsed discharge plasma over a water surface and supercritical water

Contact Info

Product

Resources

About