Natural and low-cost deep eutectic solvent for soap removal from crude biodiesel using low stirring extraction system

A series of pyrazole-based heteroaromatic compounds were synthesized by the reaction of 3-methyl-5-pyrazolone and aromatic aldehydes in Choline chloride/urea DES as a green solvent. This simple and green procedure has advantages such as easy operation, short reaction times, efficient yields, low cost and minimum use of hazardous solvents and catalysts. The structure of compounds was determined by IR, 1H and 13C NMR spectra, and the crystal structure of 4a was confirmed using X-ray crystallographic analysis. The optical properties of Pyrazole derivatives 4a-g have also been studied with UV/vis and fluorescence spectroscopy. All of these pyrazole-containing heteroaromatic compounds displayed maximum emission peak from 340 to 360 nm.

Download Full-text

Deep Eutectic Solvents: An Alternative Medium for the Preparation of Organosulfur Compounds

Current Green Chemistry ◽

10.2174/2213346107999200616110434 ◽

2020 ◽

Vol 7 (2) ◽

pp. 179-200

Author(s):

Daniela Hartwig ◽

José E.R. Nascimento ◽

Luana Bettanin ◽

Thalita F. B. Aquino ◽

Raquel G. Jacob ◽

...

Keyword(s):

Low Cost ◽

Deep Eutectic Solvent ◽

Deep Eutectic Solvents ◽

High Viscosity ◽

Organic Reactions ◽

Organosulfur Compounds ◽

Aromatic Substitution ◽

Substitution Reactions ◽

One Pot ◽

Synthetic Intermediates

Deep Eutectic Solvent (DES) as a “green solvent” has been used as an alternative to replace Volatile Organic Compounds (VOCs) and traditional Ionic Liquids (ILs). In recent years, DES has gained much attention due to its excellent properties such as low cost, easy preparation, high viscosity, low vapor pressure, low volatility, high thermal stability, biodegradability and non-toxicity, among others. Other classes of compounds with increased interest are organosulfur compounds due to their applicability as synthetic intermediates in organic reactions and their high importance in pharmaceutical and agrochemical industries. This review describes the recent advances in the preparation of organosulfur compounds using DES as an alternative solvent, focusing on several types of organic reactions, including aromatic substitution reactions (SNAr), condensation, cyclocondensation, cyclization, ring-opening, thia-Michael addition, one-pot reactions and heterocyclodehydrations.

Download Full-text

Development of low cost agarwood essential oil extraction system for agar tree growers in Bangladesh

Journal of the Bangladesh Agricultural University ◽

10.3329/jbau.v12i1.21407 ◽

2014 ◽

Vol 12 (1) ◽

pp. 167-170

Author(s):

MA Islam ◽

MD Hussain ◽

E Kabir ◽

MZ Hasan

Keyword(s):

Essential Oil ◽

Extraction Method ◽

Low Cost ◽

Oil Extraction ◽

Extraction System ◽

Cost Ratio ◽

Benefit Cost Ratio ◽

Extraction Chamber ◽

Benefit Cost ◽

Agarwood Oil

This experiment was conducted to bring in a suitable and economic agarwood oil extraction method for Agar tree (Aquilaria agollocha) growers in Bangladesh. Agarwood was collected from Fotikchori upazila of Chittagong district and a prototype of hydro-distillation extraction chamber was developed at the lab of Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh, Bangladesh during January to March 2013. Using the prototype, 7 ml of agarwood oil was extracted from 15 kg matured agarwood. It was found from the calculation that the developed system can bring yearly benefit of Tk. 7,78,389 with benefit-cost ratio as 2.33. This development was, therefore, proven very beneficial for Bangladeshi agar tree growers. DOI: http://dx.doi.org/10.3329/jbau.v12i1.21407 J. Bangladesh Agril. Univ. 12(1): 167-170, June 2014

Download Full-text

Liquid Liquid Equilibria measurements for the extraction of poly aromatic nitrogen hydrocarbons with a low cost Deep Eutectic Solvent: Experimental and theoretical insights

Journal of Molecular Liquids ◽

10.1016/j.molliq.2017.08.044 ◽

2017 ◽

Vol 243 ◽

pp. 542-552 ◽

Cited By ~ 19

Author(s):

Papu Kumar Naik ◽

Sandip Paul ◽

Tamal Banerjee

Keyword(s):

Low Cost ◽

Deep Eutectic Solvent

Download Full-text

The effect of silica modified by deep eutectic solvents on the properties of nature rubber/silica composites

Journal of Elastomers & Plastics ◽

10.1177/00952443211020051 ◽

2021 ◽

pp. 009524432110200

Author(s):

Hao Yang ◽

Liu Yang ◽

Huaiqing Guo ◽

Wenbo Hu ◽

Aihua Du

Keyword(s):

Dynamic Properties ◽

Low Cost ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Rolling Resistance ◽

Molar Ratio ◽

Skid Resistance ◽

Modified Silica ◽

Scanning Calorimetry ◽

Wet Skid Resistance

The effect of deep eutectic solvent (DES) modified silica on the properties of nature rubber (NR) composites were investigated. The DES is an environment-friendly and low-cost solvent, which was prepared by mixing choline chloride and urea in a 1:2 molar ratio. The NR composites filled with DES modified silica were prepared and the properties were tested. The interaction between the DES and silica were characterized by Fourier transform infrared spectroscopy (FTIR), the interaction between silica and silica were tested by differential scanning calorimetry (DSC). The dynamic properties, such as rolling resistance and wet skid resistance, and were tested by dynamic mechanical analysis (DMA). Morphologies of the composites were characterized by scanning electron microscopy (SEM). The results indicate that the DES can interact with silica by hydrogen bond to improve the compatibility between the rubber and silica. When the content of DES was 3 phr, the tensile strength, modulus at 300%, tear strength, and the crosslinking density of the composites was increased. At the same time, the proper content of DES can reduce the rolling resistance of the vulcanized rubber while maintaining good wet skid resistance.

Download Full-text

Identification of Flavonoids (Quercetin, Gallic acid and Rutin) from Catharanthus roseus Plant Parts using Deep Eutectic Solvent

Recent Advances in Biology and Medicine ◽

10.18639/rabm.2016.02.347628 ◽

2017 ◽

Vol 03 ◽

pp. 1 ◽

Cited By ~ 1

Author(s):

Asma Nisar ◽

Awang Soh Mamat ◽

Md Irfan Hatim ◽

Muhammad Shahzad Aslam ◽

Muhammad Syarhabil Ahmad ◽

...

Keyword(s):

Gallic Acid ◽

Catharanthus Roseus ◽

Low Cost ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Health And Safety ◽

Deep Eutectic Solvents ◽

Green Technology ◽

Flower Petal ◽

Plant Parts

Green technology is the most important topic in the pharmaceutical field because it reduces the cost of medicines and minimizes the environmental impact of the field and is better for human health and safety. Green chemistry emphasizes that the solvent should be nontoxic, safe, cheap, green, readily available, recyclable, and biodegradable. Deep eutectic solvents, a new type of green solvent, have some renowned properties—for instance, high thermal stability, low vapor pressure, low cost, biodegradability, and high viscosity. In this study, deep eutectic solvents made up of choline chloride-glycerol (1:2) were used for the extraction and isolation of flavonoid (rutin, gallic acid, and quercetin) from Catharanthus roseus plant parts, flower petal, leaves, stem, and root. The amounts of rutin and quercetin in flower petal are 29.46 and 6.51%, respectively, whereas, rutin, gallic acid, and quercetin amounts in leaves are 25.16, 8.57, and 10.47%, respectively. In stem the amounts of rutin, gallic acid, and quercetin are 13.02, 5.89, and 7.47%, respectively. In root, only quercetin has been obtained that is 13.49%. The HPLC is an analytical method, which was found to be an excellent technique for determination of rutin, gallic acid, and quercetin using deep eutectic solvent extraction from plant parts of Catharanthus roseus.

Download Full-text