scholarly journals Optimizing the start-up process of post-combustion capture plants by varying the solvent flow rate

2017 ◽  
Author(s):  
Thomas Marx-Schubach ◽  
Gerhard Schmitz
Keyword(s):  
Flow Rate ◽  
Solvent Flow Rate ◽  
Start Up ◽  
Solvent Flow

scholarly journals Extraction of red cabbage anthocyanins: optimization of the operation conditions of the column process

2008 ◽  
Vol 51 (1) ◽  
pp. 143-152 ◽  
Author(s):  
Marcelo Fonseca Xavier ◽  
Toni Jefferson Lopes ◽  
Mara Gabriela Novy Quadri ◽  
Marintho Bastos Quadri
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Flow Rate ◽  
Batch Studies ◽  
Red Cabbage ◽  
Solvent Flow Rate ◽  
Operation Conditions ◽  
Ionic Force ◽  
Solvent Flow ◽  
Column Process

The aim of this work was to extract anthocyanins from the red cabbage. Batch studies under several extraction conditions indicated that acetic acid in aqueous solution (10% V/V) was the best solvent, used in the proportion of 0.25 g of red cabbage mL-1. At this condition, column assays were carried out to evaluate the influence of the ionic force, pH, solvent flow rate, recirculated volume of red cabbage juice and the mass of red cabbage. Results showed that the pH, recirculation and mass of red cabbage had statistically significant effects, where the optimum operation conditions found for the process were pH 2.3, recirculation volume of the solvent 0.83 L and mass of red cabbage 50 g.

Impact of blends of aqueous amines on absorber intercooling for post combustion CO2 capture system

2021 ◽  
pp. 0958305X2098283
Author(s):  
Muhammad Imran ◽  
Usman Ali ◽  
Ali Hasnain
Keyword(s):  
Global Warming ◽  
Power Plant ◽  
Flow Rate ◽  
Energy Requirement ◽  
Capture Rate ◽  
High Energy ◽  
Combined Cycle ◽  
Capture Process ◽  
Solvent Flow Rate ◽  
Solvent Flow

Climate change is the biggest challenge of this century due to the global consequences of human activities on the ecosystem resulting in global warming. The emissions of greenhouse gases, mainly CO2 from the combustion of fossil fuels in the power plant is the main cause of global warming and to mitigate these emissions is the foremost challenge. Nowadays, the most preferred method is post combustion chemical absorption using amine-based solvents. However, high energy requirements for this method restrict its deployment. An efficient approach used for the reduction of the high energy requirement of post combustion CO2 capture process was absorber intercooling. Therefore, this research evaluates the effect of two configurations of intercooled absorber such as “simple” and “advanced” intercoolers for CO2 capture integrated with natural gas combined cycle power plant using aqueous alkanolamines, such as 30 wt.% monoethanolamine and 50 wt.% methyl-diethanolamine and their blends. For pure methyl-diethanolamine case, at lean loading 0.01 intercooling configurations; simple and advanced shows the highest reduction of 21.01% and 22.82% in the specific reboiler duty, respectively in comparison to other blends at the expense of highest liquid solvent flow rate. Simple and advanced intercooling configurations shows optimum results for the case with 40% monoethanolamine and 60% methyl-diethanolamine in a blend with decrease of 9.19% and 17.28% in solvent flow rate and a decrease of 9.42% and 16.83% in specific reboiler duty required for 90% CO2 capture rate, respectively. For pure monoethanolamine case at lean loading 0.2 absorber intercooling does not offer significant results.

scholarly journals Critical review of supercritical fluid extraction of selected spice plant materials

2011 ◽  
Vol 30 (2) ◽  
pp. 197 ◽  
Author(s):  
Milan N. Sovilj* ◽  
Branislava G. Nikolovski ◽  
Momčilo Đ. Spasojević
Keyword(s):  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Flow Rate ◽  
Operating Conditions ◽  
Pharmaceutical Drugs ◽  
Fluid Extraction ◽  
Plant Materials ◽  
Solvent Flow Rate ◽  
Pharmaceutical Industries ◽  
Solvent Flow

Supercritical fluid extraction (SFE) is one of the relatively new efficient separation method for the extraction of essential oils from different plant materials. The new products, extracts, can be used as a good base for the production of pharmaceutical drugs and additives in the perfume, cosmetic, and food industries. The aim of this work was to analyze the supercritical carbon dioxide extraction (SC-CO2) of oils from the selected spice plant materials. In this paper the process parameters such as pressure, temperature, solvent flow rate, size of grinding materials, and ratio of the co-solvent were presented for the selected spice plant materials: black pepper, caraway, celery, cinnamon, clove, coriander, daphne, fennel, ginger, hyssop, juniper, lavender, oregano, pennyroyal, red pepper, safflower, sage, turmeric, and vanilla. The values of operating conditions were: pressure from 7.5 to 68 MPa, temperature from 293 to 363 K, solvent flow rate from 0.003 to 30.0 kg/h, and diameter of grinding material from 0.17 to 3.90 mm. The global yield and quality of the extracts all of the plant material investigated, as well as the possibility of their application in the food, cosmetics and pharmaceutical industries were analyzed. The composition of the extracts was wery complex, and in every case the extract was composed of more than 200 components. All the compounds from the CO2 extracts were classified in the following groups: monoterpene, sesquiterpene, oxygenated monoterpene, and oxygenated sesquiterpene and other hydrocarbon groups. In some of the systems investigated the different mathematical models (Sovová, Hong), which have taken from the literature, were used to correlate the experimental data.

Parametric Evaluation for Extraction of Catechin from Areca Catechu Linn Seeds using Supercritical CO2 Extraction

2015 ◽  
Vol 74 (7) ◽  
Author(s):  
Muhammad Syafiq Hazwan Ruslan ◽  
Mohd Azizi Che Yunus ◽  
Zuhaili Idham ◽  
Noor Azian Morad ◽  
Asmadi Ali
Keyword(s):  
Particle Size ◽  
Supercritical Fluid ◽  
Flow Rate ◽  
Average Particle Size ◽  
Average Particle ◽  
Tropical Country ◽  
Solvent Flow Rate ◽  
Areca Catechu ◽  
Pharmaceutical Industries ◽  
Solvent Flow

Supercritical fluid extraction is an advanced extraction technique which has been proven its efficiency and selectivity in numerous studies. Dense gas with diffusivity nearing liquid and viscosity closed to gas phase, supercritical fluid can provide better performance in the extraction of natural and heat sensitive active compounds. Areca Catechu Linn or commonly known as betel nut can be easily found in tropical country especially in south-east and south of Asia with India as its world largest producer. Phenolic compound present in Areca Catechu Linn are condensed tannins and also catechin. Catechin is a highly active compound with several properties such as anti-depressant, anti-oxidant, anti-viral, anti-flammatory and anti-aging which are in demand by cosmetic and pharmaceutical industries. The aim of this study is to determine the best particle size, solvent flow rate, presence of modifier or co-solvent, and time of extraction for this pre-treatment study. Average particle size of 0.1774 mm (dp4) was detected as the best particle size for the extraction process with 3 mL/min solvent flow rate with 5% methanol added to solvent. Modifier presence enhances the extraction by improving the ability to extract more polar compound such as catechin. The best catechin recovery was observed at 3mL/min, solvent composition of 95:5 (SC-CO2:MeOH) at the temperature of 70ᵒC and pressure of 30 MPa with 47.38 μg catechin/g extracts.

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