scholarly journals Green biorefinery — the ultra-high hydrolysis rate and behavior of Populus tomentosa hemicellulose autohydrolysis under moderate subcritical water conditions

RSC Advances ◽  
2020 ◽  
Vol 10 (32) ◽  
pp. 18908-18917 ◽  
Author(s):  
Yanru Xu ◽  
Pengfei Wang ◽  
Shiwen Xue ◽  
Fangong Kong ◽  
Hao Ren ◽  
...  
Keyword(s):  
Conversion Rate ◽  
Subcritical Water ◽  
Populus Tomentosa ◽  
Hydrolysis Rate ◽  
Green Solvent ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Water Conditions ◽  
Green Biorefinery ◽  
And Behavior

A high monosaccharide conversion rate of hemicellulose in a green solvent and under moderate reaction conditions for industrialization is one of the most important keys in a lignocellulosic biorefinery.

Intensification and optimization of the process for thyme oil in water nanoemulsions preparation using subcritical water and xanthan gum

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Omid Ahmadi ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Escherichia Coli ◽  
Xanthan Gum ◽  
Subcritical Water ◽  
Green Solvent ◽  
Optimal Conditions ◽  
Thyme Oil ◽  
Potential Value ◽  
Oil In Water ◽  
Water Conditions ◽  
Bactericidal Activities

AbstractIntensified process based on subcritical water conditions (120 °C and 1.5 atm, for 2 h) was utilized to prepare thyme oil in water (O/W) nanoemulsions. In this technique, water and xanthan gum, as green solvent and natural microbial emulsifier, were utilized. Results of gas chromatography revealed that Thymol and Carvacrol were two main bioactive compounds of the extracted thyme oil. Effects of amounts of xanthan gum (0.05–0.25 g) and thyme essential oil (0.2–0.8 mL) on size of oil nanodroplets and polydispersity index (PDI) of the resulted nanoemulsions were evaluated using response surface methodology. Results demonstrated that the produced thyme O/W nanoemulsion by 0.242 mL thyme oil and 0.140 g xanthan gum had smallest average nanodroplet size (150 nm) and PDI (0.088). Furthermore, monodispersed and spherical in shape thyme oil nanodroplets were provided in the nanoemulsion using these optimal conditions with zeta potential value of −10.1 mV and antioxidant activity of 17.4%. Results also indicated that this prepared nanoemulsion had high fungicidal and bactericidal activities toward Penicillium digitatum and Escherichia coli, respectively.

Efficient synthesis of pyrido[2,3-d]pyrimidine-7-carboxylic acids catalyzed by a TiO2/SiO2 nanocomposite in aqueous media at room temperature

2018 ◽  
Vol 73 (9) ◽  
pp. 641-645 ◽  
Author(s):  
Sepehr Sadegh-Samiei ◽  
Shahrzad Abdolmohammadi
Keyword(s):  
Heterogeneous Catalyst ◽  
Carboxylic Acids ◽  
Room Temperature ◽  
Aqueous Media ◽  
Reaction Times ◽  
Molar Ratio ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Recyclable Heterogeneous Catalyst

AbstractA novel and efficient synthesis of eight 5-aryl-1,3-dimethyl-2,4-dioxo-1,2,3,4,5,8-hexahydropyrido[2,3-d]pyrimidine-7-carboxylic acids using a TiO2/SiO2 nanocomposite with a molar ratio of 1:1 as a recyclable heterogeneous catalyst is described. The desired products, five of which are new, are formed in short reaction times (2–3 h) with high to excellent yields (94%–98%) under very moderate reaction conditions (room temperature, aqueous media).

Production of phenolic compounds from rice bran biomass under subcritical water conditions

2010 ◽  
Vol 160 (1) ◽  
pp. 259-266 ◽  
Author(s):  
Omid Pourali ◽  
Feridoun Salak Asghari ◽  
Hiroyuki Yoshida
Keyword(s):  
Phenolic Compounds ◽  
Rice Bran ◽  
Subcritical Water ◽  
Water Conditions

Copper-catalyzed synthesis of 2-aminophenyl benzothiazoles: a novel approach

2018 ◽  
Vol 16 (37) ◽  
pp. 8267-8272 ◽  
Author(s):  
S. N. Murthy Boddapati ◽  
Chandra Mohan Kurmarayuni ◽  
Baby Ramana Mutchu ◽  
Ramana Tamminana ◽  
Hari Babu Bollikolla
Keyword(s):  
Nucleophilic Substitution ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Cross Coupling Reactions ◽  
Novel Approach

Substituted 2-aminophenyl benzothiazoles have been constructed from thiourea via copper-catalyzed desulfurization/nucleophilic substitution followed by domino intra- and intermolecular C–N cross-coupling reactions under moderate reaction conditions.

scholarly journals Microwave Assisted Three Component Reaction Conditions to Obtain New Thiazolidinones with Different Heterocyclic Skeletons

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 38
Author(s):  
Fernando J. Lorenzo ◽  
Romina A. Ocampo ◽  
Sandra D. Mandolesi
Keyword(s):  
Microwave Irradiation ◽  
Thioglycolic Acid ◽  
Aldehyde Group ◽  
Green Solvent ◽  
Reaction Products ◽  
Reaction Conditions ◽  
One Pot ◽  
Microwave Assisted ◽  
Three Component Reaction ◽  
The One

We present here a new proposal for the “one pot” generation of new 4-thiazolidinones (9a–e) through a multicomponent reaction under microwave irradiation conditions, using aromatic and heteroaromatic amines (8a–e), absolute ethanol as a “green” solvent and modifying the aldehyde group in the glycosidic residue, synthesized from D-mannitol. The study is focused in the variation of the irradiation times and the concentration of thioglycolic acid in order to study the possibility of controlling the structure and/or stereochemistry of the products formed in the reaction. Thiazolidinones 9a–d were obtained with a 69–82% The generation of the corresponding reaction products were monitored by TLC and CG-MS, taking reaction aliquots. The conditions reaction proved to be chemoselective depending on the excess of acid and irradiation times.

Oxidation of Higher Alkanes at Moderate Reaction Conditions with Ozone in Presence of Mesoporous Materials

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
V. S. R. Rajasekhar Pullabhotla ◽  
S. B. Jonnalagadda
Keyword(s):  
Carboxylic Acids ◽  
Mesoporous Materials ◽  
Molecular Sieves ◽  
Mesoporous Molecular Sieves ◽  
Reaction Products ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Product Molecule ◽  
Relative Selectivity ◽  
Mcm 41

AbstractThe scope of mesoporous molecular sieves, Al-MCM-41, as catalysts in the ozone initiated fuctionalisation of higher n-alkanes at 20 ± 1 °C and ~1 atm conditions is investigated. Oxygen is introduced into carbonaceous site in the product molecule forming 2-, 3- and 4- keto- isomers as main products and carboxylic acids as minor products. The % conversion, reaction products and selectivity for the catalysed reactions are compared. In presence of catalysts, the relative selectivity towards 4-ketone is increased.

scholarly journals Life cycle assessment of biodiesel production from algal bio-crude oils extracted under subcritical water conditions

2014 ◽  
Vol 170 ◽  
pp. 454-461 ◽  
Author(s):  
Sundaravadivelnathan Ponnusamy ◽  
Harvind Kumar Reddy ◽  
Tapaswy Muppaneni ◽  
Cara Meghan Downes ◽  
Shuguang Deng
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Subcritical Water ◽  
Biodiesel Production ◽  
Crude Oils ◽  
Water Conditions

Catalytic Synthesis of Isoamyl Acetate Catalyzed by (NH4)6[MnMo9O32]•8H2O Supported Activated Carbon with Waugh Structure

2013 ◽  
Vol 781-784 ◽  
pp. 190-193
Author(s):  
Mei Xu ◽  
Hua Yuan ◽  
Wei Liu ◽  
Jian Wang ◽  
Feng Zhen Yang
Keyword(s):  
Acetic Acid ◽  
Activated Carbon ◽  
Reaction Time ◽  
Conversion Rate ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Catalytic Synthesis ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Optimum Reaction

The synthesis of isoamyl acetate with ammonium 9-molybdate manganese heteropolyacid salt supported activated carbon as catalyst was studied. The optimum reaction conditions are obtained as follows: isoamyl alcohol to acetic acid molar ratio = 1.646, the weight of catalyst is 40% of total weigh, m (acidulate catalyst)=0.2g, m (water carrying reagent toluene) = 3ml, reaction time is about 63 minutes. Selectivity is 100% and conversion rate is 89.48%.

Hydrolysis kinetics of sunflower oil under subcritical water conditions

2009 ◽  
Vol 87 (6) ◽  
pp. 867-873 ◽  
Author(s):  
R. Alenezi ◽  
G.A. Leeke ◽  
R.C.D. Santos ◽  
A.R. Khan
Keyword(s):  
Sunflower Oil ◽  
Subcritical Water ◽  
Hydrolysis Kinetics ◽  
Water Conditions ◽  
Kinetics Of
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