Effect of stratification on the mixing and reaction yield in a T-shaped micro-mixer

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
A. Mariotti ◽  
C. Galletti ◽  
R. Mauri ◽  
M. V. Salvetti ◽  
E. Brunazzi
Keyword(s):  
Reaction Yield ◽  
Micro Mixer

scholarly journals ChCl: Gly (DESs) Promote Environmentally Benign Synthesis of Xanthene Derivatives and Their Antitubercular Activity

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3667
Author(s):  
Mashooq A. Bhat ◽  
Ahmed M. Naglah ◽  
Siddique Akber Ansari ◽  
Hanaa M. Al-Tuwajiria ◽  
Abdullah Al-Dhfyan
Keyword(s):  
Reaction Times ◽  
Antitubercular Activity ◽  
Antimycobacterial Activity ◽  
Environmentally Benign ◽  
Reaction Yield ◽  
Benign Synthesis ◽  
Xanthene Derivatives ◽  
Wide Range ◽  
Major Application

A ChCl: Gly (DESs) promoted environmentally benign method was developed for the first time using the reaction of aryl aldehydes and dimedone to give excellent yields of xanthene analogues. The major application of this present protocol is the use of green solvent, a wide range of substrate, short reaction times, ease of recovery, the recyclability of the catalyst, high reaction yield, and ChCl: Gly as an alternative catalyst and solvent. In addition to this, all the synthesized compounds were evaluated for their in vitro antimycobacterial activity against M. tuberculosis H37Ra (MTB) and M. bovis BCG strains. The compounds 3d, 3e, 3f, and 3j showed significant antitubercular activity against MTB and M. bovis strains with minimum inhibitory concentration (MIC) values of 2.5−15.10 µg/mL and 0.26–14.92 µg/mL, respectively. The compounds 3e, 3f, and 3j were found to be nontoxic against MCF-7, A549, HCT 116, and THP-1 cell lines. All the prepared compounds were confirmed by 1H NMR and 13C NMR analysis.

Direct conversion of cellulose to ethyl levulinate catalysed by modified fibrous mesoporous silica nanospheres in a co-solvent system

2021 ◽  
Vol 45 (12) ◽  
pp. 5526-5539
Author(s):  
Zhi Zhang ◽  
Zhihang Huang ◽  
Hong Yuan
Keyword(s):  
Mesoporous Silica ◽  
Solvent System ◽  
Direct Conversion ◽  
Reaction Yield ◽  
Silica Nanospheres ◽  
Ethyl Levulinate ◽  
System A ◽  
System P ◽  
Mesoporous Silica Nanospheres

A KCC-1/Al–SO3H catalyst with Si/Al = 5 was prepared to directly catalyse the synthesis of ethyl levulinate from cellulose in an ethanol/toluene co-solvent system. A reaction yield of 28.8 mol% was achieved after 6 h at 200 °C.

scholarly journals Three-dimensionally crossing manifold micro-mixer for fast mixing in a short channel length

Lab on a Chip ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 100-103 ◽  
Author(s):  
Tae Woo Lim ◽  
Yong Son ◽  
Yu Jin Jeong ◽  
Dong-Yol Yang ◽  
Hong-Jin Kong ◽  
...  
Keyword(s):  
Channel Length ◽  
Short Channel ◽  
Micro Mixer

High-yield synthesis of CsPbBr3 nanoparticles: Diphenylphosphine as a reducing agent and its effect in Pb-seeding nucleation and growth

2021 ◽  
Author(s):  
Eder Antonio Castillo-Ruiz ◽  
Diana Fabiola Garcia-Gutierrez ◽  
Domingo Ixcóatl Garcia-Gutierrez
Keyword(s):  
Nucleation And Growth ◽  
Reducing Agent ◽  
High Yield ◽  
Reaction Yield ◽  
High Quality ◽  
Stabilizing Agents ◽  
Nucleation Sites ◽  
Nucleation Mechanisms ◽  
Attractive Option ◽  
Mass Increment

Abstract Based on the reported nucleation mechanisms for CsPbX3 and II-VI/IV-VI quantum dots, CsPbBr3 nanoparticles with a high reaction-yield, up to 393% mass-increment, were synthesized by the hot-injection method. The introduction of diphenylphosphine (DPP) as a reducing agent improved nanoparticle nucleation and growth, giving out evidence for Pb-seeding in CsPbBr3 nanoparticles formation. Additionally, a clear influence of the DPP in a CsPbBr3-Cs4PbBr6 incomplete phase transformation was observed, marked by the appearance of several PbBr2 nanoparticles, indicating the need for an improved ratio between the stabilizing agents and the precursors, due to the increased number of nucleation sites produced by the DPP. The resulting CsPbBr3 nanoparticles showed high quality, as they displayed 70%-90% photoluminescence quantum yield (PLQY), narrow size distribution with an average nanoparticle size of ~10 nm and the characteristic cubic morphology reported in previous works. This increment in CsPbBr3 nanoparticles’ reaction yield will contribute to making them a more attractive option for different optoelectronic applications.

Immobilizing Bacillus subtilis on the carrier of poly (acrylic acid)/sodium bentonite for treating sludge from Pangasius fish ponds

2021 ◽  
Vol 6 (1) ◽  
pp. 43-49
Author(s):  
Thanh Duoc Nguyen ◽  
Binh Doan ◽  
Thu Hong Pham Thi
Keyword(s):  
Bacillus Subtilis ◽  
Acrylic Acid ◽  
Absorbed Dose ◽  
Pond Water ◽  
Reaction Yield ◽  
Fish Ponds ◽  
Adsorption Method ◽  
Sodium Bentonite ◽  
Better Than ◽  
Poly Acrylic Acid

Sodium bentonite (NaBent) was modified by poly(acrylic acid) (PAAc) to prepare the carriers for immobilization of Bacillus subtilis. Different mixtures of NaBent/AAc were regularly dispersed in distilled water and irradiated under gamma rays at an absorbed dose of 6.5 kGy with dose rate of 0.85 kGy/hr in air for polymerization of acrylic acid and formation of poly(acrylic acid)/sodium bentonite (PAAc–NaBent). The reaction yield was determined with the initial concentration of acrylic acid (AAc). The functional group properties of the resulting PAAc–NaBent were analyzed by Fourier Transform Infrared spectra (FTIR). Bacillus subtilis cells were immobilized on both NaBent and PAAc–NaBent as carriers by adsorption method for treating the sludge contaminated by fish feces and residual feed from the Pangasius farming ponds. The results showed that immobilization capacity of Bacillus subtilis on the PAAc–NaBent was better than that on non-modified NaBent. Analysis of BOD for the farming pond water containing Bacillus subtilis and the bacteria immobilized carriers with time revealed the lower BOD values obtained with the samples containing PAAc–NaBent, suggested that degradation of organic pollutants by Bacillus subtilis immobilized on the PAAc–NaBent was faster than that by free bacteria.

Prediction of Chemical Reaction Yield in a Microreactor and Development of a Pilot Plant Using the Numbering-Up of Microreactors

2010 ◽  
Author(s):  
Shigenori Togashi ◽  
Yukako Asano ◽  
Yoshishige Endo
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Chemical Reaction ◽  
Rate Constant ◽  
Pilot Plant ◽  
Reaction Rate ◽  
Main Product ◽  
Reaction Rate Constant ◽  
Reaction Yield ◽  
Production Scale

The chemical reaction yield was predicted by using Monte Carlo simulation. The targeted chemical reaction of a performance evaluation using the microreactor is the consecutive reaction. The main product P1 is formed in the first stage with the reaction rate constant k1. Moreover, the byproduct P2 is formed in the second stage with the reaction rate constant k2. It was found that the yield of main product P1 was improved by using a microreactor when the ratio of the reaction rate constants became k1/k2 >1. To evaluate the Monte Carlo simulation result, the yields of the main products obtained in three consecutive reactions. It was found that the yield of the main product in cased of k1/k2 >1 increased when the microreactor was uesd. Next, a pilot plant involving the numbering-up of 20 microreactors was developed. The 20 microreactor units were stacked in four sets, each containing five microreactor units arranged. The maximum flow rate when 20 microreactors were used was 1 × 104 mm3/s, which corresponds to 72 t/year. Evaluation of the chemical performance of the pilot plant was conducted using a nitration reaction. The pilot plant was found to capable of increasing the production scale without decreasing the yield of the products.

scholarly journals Activity of phthalocyanine-sensitized TiO2-anatase in photooxidation of sulfite ions

2015 ◽  
Vol 17 (2) ◽  
pp. 64-69 ◽  
Author(s):  
Maria Galbas ◽  
Agnieszka Banaszczyk ◽  
Gabriela Dyrda ◽  
Kszysztof Szczegot ◽  
Rudolf Słota
Keyword(s):  
Water Phase ◽  
Visible Range ◽  
Reaction Yield ◽  
Tio2 Anatase ◽  
Hybrid Catalysts ◽  
Nano Crystalline ◽  
Uv Visible ◽  
Sulfite Ions

Abstract Hybrid catalysts based on the TiO2 matrix impregnated with Nd, Eu and Yb diphthalocyanines proved effective in oxidation of sulfite ions under irradiation with light from the UV-visible range. Micro- and nano-crystalline anatase powders were used in preparation of the photocatalysts, which were applied in the form of a suspension in the water phase. The reaction yield was found to depend on the phthalocyanine sensitizer used and the conditions of TiO2 impregnation. The best results were obtained when micro-anatase impregnated with Yb-diphthalocyanine was used.

Sign in / Sign up

Export Citation Format

Share Document