Effect of process parameters on solvolysis liquefaction of Chlorella pyrenoidosa in ethanol–water system and energy evaluation

Peng, Xiaowei; Ma, Xiaoqian; Lin, Yousheng; Wang, Xusheng; Zhang, Xiaoshen; Yang, Cheng

doi:10.1016/j.enconman.2016.03.029

Cited by 69 publications

(21 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both nitrogen and oxygen contents can be reduced either by upgrading the bio-oil (Guo et al, 2015) or adding catalysts during HTL (Pragya et al, 2013). Recently, it has been reported that processing microalgae with organic solvents can led to better bio-oil quality; some examples are ethanol (Huang et al, 2011;Chen et al, 2012;Reddy et al, 2014;Zhang and Zhang, 2014;Peng et al, 2016), methanol (Patil et al, 2011;Sitthithanaboon et al, 2015) and others (Yuan et al, 2011;Jin et al, 2014a). However, most of these experiments were performed in pure organic solvents or with a negligible amount of water compared to the amount of the organic solvent, which requires low-water content in microalgae.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

Caporgno

Pruvost

Legrand

et al. 2016

Bioresource Technology

View full text Add to dashboard Cite

Although the hydrothermal liquefaction is considered a promising technology for converting microalgae into liquid biofuels, there are still some disadvantages. This paper demonstrated that the bio-oil yield can be significantly improved by adding alcohols as co-solvents and carrying out the conversion at mild conditions (<250°C), but at the expense of a reduced bio-oil quality. By adding ethanol, the bio-oil yields obtained (up to ∼60%) were comparable to the yield obtained at severe operating conditions using only water as solvent (54±2% on average), but the quality of the bio-oil was lower. However, the main advantages of the process here described lie in the utilisation of wet microalgae (∼75% moisture) and alcohol concentrations which avoid both drying the microalgae and decreasing the amount of microalgae loaded in the reactor.

show abstract

Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

Caporgno

Pruvost

Legrand

et al. 2016

Bioresource Technology

View full text Add to dashboard Cite

show abstract

“…The detailed experimental procedure was described in our previous study (Peng et al, 2016b). Briefly, 18.8 g of microalgae sample and 75 mL of ethanol-water mixed solvent (ethanol content: 0%, 20%, 40%, 60%, 80% and 100%v/v) were fed into a 250 mL autoclaves.…”

Section: Methodsmentioning

confidence: 99%

“…Effect of Biochar on the Cracking of Tar from the Pyrolysis of a Pine Sawdust in a Fixed Bed Reactor. Energy Procedia 75, 196-201.Table 1 Elemental analysis and HHV of biocrude oil obtained from different ethanol content(Peng et al, 2016b) …”

mentioning

confidence: 99%

Combustion performance of biocrude oil from solvolysis liquefaction of Chlorella pyrenoidosa by thermogravimetry–Fourier transform infrared spectroscopy

Peng

Lin

et al. 2017

Bioresource Technology

Self Cite

View full text Add to dashboard Cite

“…Improvements in biocrude quality when using alcohol co-solvents are most commonly determined by calculated HHV values of the biocrude [35,38,39]. However, these values often have considerable uncertainty, especially if the oxygen content of the biocrude is estimated by mass difference.…”

Section: Ethanolmentioning

confidence: 99%

“…However, these values often have considerable uncertainty, especially if the oxygen content of the biocrude is estimated by mass difference. Furthermore, although a biocrude's calorific value may increase when using alcohol co-solvents, this is often accompanied by increased nitrogen content and decreased H/C ratio, both of which are undesirable with respect to biocrude quality [33,39,40]. In addition, Reduced H/C ratios are inconsistent with the often mentioned "hydrogen donor effect" of added ethanol.…”

Section: Ethanolmentioning

confidence: 99%

Use of Co-Solvents in Hydrothermal Liquefaction (HTL) of Microalgae

et al. 2019

View full text Add to dashboard Cite

This study reviewed and summarized the literature regarding the use of alcohols during hydrothermal liquefaction (HTL) of algal biomass feedstocks. The use of both pure alcohols and alcohol-water co-solvents were considered. Based upon this review, laboratory experiments were conducted to investigate the impacts of different alcohol co-solvents (ethanol, isopropanol, ethylene glycol, and glycerol) on the HTL treatment of a specific saltwater microalga (Tetraselmis sp.) at two temperatures: 300 °C and 350 °C. Based on their performance, two co-solvents, isopropanol and ethylene glycol, were selected to explore the effects of varying solvent concentrations and reaction temperatures on product yields and biocrude properties. The type and amount of added alcohol did not significantly affect the biocrude yield or composition. Biocrude yields were in the range of 30–35%, while a nearly constant yield of 21% insoluble products was observed, largely resulting from ash constituents within the algal feedstock. The benefits of using alcohol co-solvents (especially isopropanol) were the reduced viscosity of the biocrude products and reduced rates of viscosity increase with biocrude aging. These effects were attributed mainly to the physical properties of the co-solvent mixtures (solubility, polarity, density, etc.) rather than chemical processes. Under the reaction conditions used, there was no evidence that the co-solvents participated in biocrude production by means of hydrogen donation or other chemical processes. Recovery and recycling of the co-solvent present various challenges, depending upon the type and amount of the co-solvent that is used. For example, glycol solvents are recovered nearly completely within the aqueous product stream, whereas simple alcohols are partitioned between the biocrude and aqueous product streams. In commercial applications, the slight benefits provided by the use of co-solvents must be balanced by the challenges of co-solvent recovery and recycling.

show abstract

Effect of process parameters on solvolysis liquefaction of Chlorella pyrenoidosa in ethanol–water system and energy evaluation

Cited by 69 publications

References 46 publications

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

Hydrothermal liquefaction of Nannochloropsis oceanica in different solvents

Combustion performance of biocrude oil from solvolysis liquefaction of Chlorella pyrenoidosa by thermogravimetry–Fourier transform infrared spectroscopy

Use of Co-Solvents in Hydrothermal Liquefaction (HTL) of Microalgae

Contact Info

Product

Resources

About