Effect of Several Factors on the Synthesis of Calcium Hydroxide Prepared by Spray Drying Method Using Limestone

2007 ◽  
Vol 544-545 ◽  
pp. 733-736
Author(s):  
Moon Kwan Choi ◽  
Jin Sang Cho ◽  
Sung Min Joo ◽  
Jin Koo Park ◽  
Ji Whan Ahn ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Spray Drying ◽  
Feeding Rate ◽  
Spherical Shape ◽  
Initial Reaction ◽  
Outlet Temperature ◽  
Drying Method ◽  
Precipitated Calcium Carbonate ◽  
Carbonation Process

The purpose of this work is to influence of CaO concentrations of 5.0 wt.% and 10.0 wt.%, slurry feeding rate of 200~400 /min, rotating rate of drum of 5,000 and 10,000 rpm, inlet and outlet temperature on the synthesis of Ca(OH)2 powder, and the synthesis of precipitated calcium carbonate by carbonation process using Ca(OH)2 prepared by spray drying method. As the feeding rate of slurry was increased, the particle size of Ca(OH)2 was decreased. Regardless of rotating rate of drum, when the concentration of CaO was 5.0 wt.% and 10.0 wt.%, the morphology of Ca(OH)2 showed spherical shape of 10~30 μm and 20~60 μm, respectively. The specific surface area of synthesized Ca(OH)2 was 27~30 m2/g. When the initial reaction temperature was 11 °C and 30 °C, the shape and particle size of precipitated calcium carbonate synthesized in the carbonation process showed the rectangular shape of 0.1~0.4 μm and the spindle shape of 0.5~1.0 μm, respectively.

Change of Formation Yield and Characterization of PCC Particle Synthesized with Impurity Ions Contents by Carbonation Process

2006 ◽  
Vol 510-511 ◽  
pp. 1026-1029
Author(s):  
Jin Sang Cho ◽  
Sung Min Joo ◽  
Sang Hwan Cho ◽  
Young Hwan Yu ◽  
Im Ho Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Precipitated Calcium Carbonate ◽  
Carbonation Process ◽  
Crystal Properties ◽  
Impurity Ions

The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield and crystal properties of precipitated calcium carbonate(PCC) produced by the carbonation process was investigated in Ca(OH)2-H2O-CO2 system. The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield using particle size distribution and morphology of PCC were discussed. The particle size distribution of PCC was increased with increase of impurity ions. The morphology was transformed in order of spheroidal, scalenohedral, rhombohedral calcite for Al3+, Fe3+ and rhombospheroidal, spherical, scalenohedral for Mg2+ with increase of impurity ions.

scholarly journals CURCUMIN MICROENCAPSULATION USING CHITOSAN–ETHYL CELLULOSE–GMS MIXTURE FOR PRESERVATION OF MUCOADHESIVE PROPERTIES AND CONTROLLED RELEASE KINETIC

2022 ◽  
pp. 288-294
Author(s):  
DENI RAHMAT ◽  
YUNAHARA FARIDA ◽  
NOVI YANTIH ◽  
GITA SEPTYANA DEWI ◽  
SARAH ANGELA PURNAMA
Keyword(s):  
Particle Size ◽  
Water Content ◽  
Spray Drying ◽  
Spherical Shape ◽  
Release Kinetic ◽  
Drying Method ◽  
Solid Dosage Forms ◽  
Solid Dosage ◽  
Better Than

Objective: This research aimed to prepare curcumin microcapsules by the spray drying method and to evaluate their characteristics. Methods: The microcapsules were prepared by the spray drying method. The generated microcapsules were evaluated for organoleptic, morphology, particle size, the percentage of curcumin and water content. Furthermore, the release of curcumin from the microcapsules was tested in vitro and compared to uncoated curcumin powder. In addition, the mucoadhesive properties of uncoated curcumin powder and curcumin microcapsules were also evaluated. Results: The results showed that the microcapsules had spherical shape with particle size in the range of 100–1009 µm and water content of 9.34% (w/w) (FIII) and 8.09% (w/w) (FVI). The release of curcumin from its uncoated powder and the microcapsules FVI within 8 h were 8.87% and 26.32% (w/w), respectively. It was found that the mucoadhesive properties of microcapsules FVI were better than those of FIII and uncoated curcumin powder. Microcapsules FVI rendered the cumulative amount of curcumin remaining on the intestinal mucosa of 55% (w/w) within 3 h. Conclusion: Accordingly, curcumin microcapsules generated by spray drying could be further formulated into various solid dosage forms for a better therapeutic effect.

The Effect of Initial Hydration Temperature on the Characteristics of Calcium Hydroxide and Aragonite Precipitated Calcium Carbonate

2007 ◽  
Vol 124-126 ◽  
pp. 815-818 ◽  
Author(s):  
Ji Whan Ahn ◽  
Jung Ah Kim ◽  
Kwang Suk You ◽  
Hwan Kim ◽  
Hee Chan Cho ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Initial Temperature ◽  
Process Condition ◽  
Hydration Process ◽  
Hydration Time ◽  
Precipitated Calcium Carbonate ◽  
Solid Ratio ◽  
Carbonation Process

Precipitated Calcium Carbonate (PCC) is obtained through three processes; that of calcination, hydration, and carbonation. Thus, changes in each process condition determine the particle size or morphology of the mediums (calcium oxide and calcium hydroxide) as well as the product (PCC). To date, studies concerning precipitated calcium carbonate have mainly focused on the carbonation process, aimed at the manufacturing of PCC. Thus far, few studies on calcination or hydration have been conducted. Calcium hydroxide is regarded as the most important factor during the carbonation process. It is obtained through a hydration process. Therefore, in order to create the valuable PCC studies that center on the hydration process should be carried out. The present study seeks to investigate the effect of the hydration condition, particularly the temperature, on the synthesis characteristics of calcium hydroxide and aragonite PCC. The results show that the particle size of calcium hydroxide changes with variations in the initial hydration temperature. In particular, a higher initial temperature resulted in a larger particle size of the calcium hydroxide used in the synthesis. The particle size and yield of aragonite also increased when calcium hydroxide created at high temperatures was used. However, the water/solid ratio or total amount at the hydration time had no effect on the manufacturing process of aragonite.

scholarly journals Effect of Methane on the Synthesis of Precipitated Calcium Carbonate via Carbonation Process

2019 ◽  
Vol 7 (4.14) ◽  
pp. 163
Author(s):  
H M. Lahuri ◽  
N H. Berahim ◽  
M S. Onn ◽  
M G.M. Noh ◽  
R Othman
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
High Purity ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Ambient Conditions ◽  
Mixing Rate ◽  
Precipitated Calcium Carbonate ◽  
X Ray ◽  
Carbonation Process

Precipitated calcium carbonate (PCC) is synthetic calcium carbonate that has high purity of more than 98 wt% of CaCO3 content.  Owing to its unique characteristic whereby its shape and size can be controlled to tailor to various applications, PCC has seen great demands in many industries such as paper, paint, plastic, food, ceramics, cosmetics, pharmaceutical, and many others.  PCC can be synthesized via various methods and the most often used method in industry is via carbonation process.  This process has caught interest of the oil and gas industry for utilizing existing carbon dioxide waste from plant processes.  Precipitation of PCC is carried out using hydrated lime under various conditions at different gas purity (1 mol% CH4 + 99 mol% CO2 , 40 mol% CH4  + 60 mol% CO2 ), different gas flowrate, and different stirring rate.  All experiments are carried out using 1 litre of ionic solution at ambient conditions.  All samples are characterized using Field Emission Scanning Electron Microscopy (FESEM), Particle Size Distribution, X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF).  FESEM analysis shows different surface morphology for different methane content with calcite formation.  The particle size for all PCC produced at different parameters are comparable at the range 5-9 microns depending on the mixing rate used whereas XRF results indicate very high purity of CaCO3 of more than 99 wt%. 

scholarly journals Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum

2019 ◽  
Vol 12 (1) ◽  
pp. 14-21
Author(s):  
Jana Jurišová ◽  
Vladimír Danielik ◽  
Pavel Fellner ◽  
Milan Králik ◽  
Tomáš Foltinovič
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Flue Gas ◽  
Average Particle Size ◽  
Initial Reaction Rate ◽  
Flue Gas Desulfurization ◽  
Initial Reaction ◽  
Average Particle ◽  
Precipitated Calcium Carbonate ◽  
Compact Structure

Abstract Reactivity of various calcium carbonate samples for flue gas desulfurization was tested. Two groups of CaCO3 samples were considered; natural limestone containing calcite phase dominantly and samples prepared by the conversion of gypsum with ammonium and carbon dioxide (precipitated CaCO3) containing different amounts of calcite, aragonite and vaterite. Reactivity of precipitated calcium carbonate depends primarily on the particle size, similarly as in case of industrial samples. The initial reaction rate was comparable with the industrial limestones for samples with the average particle size lower than 15 μm. However, the conversion of laboratory samples was significantly higher after 5 min of the reaction. Phase composition of the precipitated calcium carbonate has a minor but noticeable impact on the reactivity. The presence of vaterite slightly increased the reactivity, which is in accordance with its lower compact structure in comparison with calcite and aragonite. Unexpected effect of the increased content of aragonite, which is the most compact phase in comparison with calcite and vaterite, was observed. If calcium carbonate contains up to approximately 30 % of aragonite the reactivity increases, which can be explained by the SEM pictures showing agglomerate composition with relatively high specific surface. At higher contents of aragonite, the reactivity decreases. All the obtained results proved the suitability of precipitated CaCO3 prepared from flue gas desulfurization gypsum to be recycled in the flue gas desulfurization process.

scholarly journals Effect of Methane on the Synthesis of Precipitated Calcium Carbonate via Carbonation Process

2019 ◽  
Vol 7 (4.14) ◽  
pp. 163
Author(s):  
H M. Lahuri ◽  
N H. Berahim ◽  
M S. Onn ◽  
M G.M. Noh ◽  
R Othman
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
High Purity ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Ambient Conditions ◽  
Mixing Rate ◽  
Precipitated Calcium Carbonate ◽  
X Ray ◽  
Carbonation Process

Precipitated calcium carbonate (PCC) is synthetic calcium carbonate that has high purity of more than 98 wt% of CaCO3 content.  Owing to its unique characteristic whereby its shape and size can be controlled to tailor to various applications, PCC has seen great demands in many industries such as paper, paint, plastic, food, ceramics, cosmetics, pharmaceutical, and many others.  PCC can be synthesized via various methods and the most often used method in industry is via carbonation process.  This process has caught interest of the oil and gas industry for utilizing existing carbon dioxide waste from plant processes.  Precipitation of PCC is carried out using hydrated lime under various conditions at different gas purity (1 mol% CH4 + 99 mol% CO2 , 40 mol% CH4  + 60 mol% CO2 ), different gas flowrate, and different stirring rate.  All experiments are carried out using 1 litre of ionic solution at ambient conditions.  All samples are characterized using Field Emission Scanning Electron Microscopy (FESEM), Particle Size Distribution, X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF).  FESEM analysis shows different surface morphology for different methane content with calcite formation.  The particle size for all PCC produced at different parameters are comparable at the range 5-9 microns depending on the mixing rate used whereas XRF results indicate very high purity of CaCO3 of more than 99 wt%. 

scholarly journals A DESIGN OF EXPERIMENT APPROACH FOR OPTIMIZATION AND CHARACTERIZATION OF ETODOLAC TERNARY SYSTEM USING SPRAY DRYING

2017 ◽  
Vol 9 (2) ◽  
pp. 233
Author(s):  
Amir A. Shaikh ◽  
Praveen D. Chaudhari ◽  
Sagar S. Holkar
Keyword(s):  
Particle Size ◽  
Ternary System ◽  
Spray Drying ◽  
Design Of Experiment ◽  
Particle Size Analysis ◽  
Polyvinyl Pyrrolidone ◽  
Size Analysis ◽  
Drying Method ◽  
Physical Mixtures ◽  
Pvp K30

<p><strong>Objective: </strong>The objective of the present investigation was to prepare and characterize Etodolac (ETO), Polyvinyl pyrrolidone K30 (PVP K30) and Hydroxypropyl β-cyclodextrin (HPB) ternary system in order to study the effect of complexation on solubility of ETO.</p><p><strong>Methods: </strong>Physical mixtures of a drug and polymers in different weight ratios (1:1, 1:2, 1:4) were prepared to study the effect of individual polymers on solubility of ETO. Spray drying method was used to investigate the combined effect of PVP K30 and HPB on saturation solubility (SS), Dissolution efficiency (DE) and mean dissolution time (MDT) of ETO. Design of experiment (DoE) was used for preparation and optimization of ternary system. Drug polymer interactions were analyzed with Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), Scanning electron microscopy (SEM), Xray diffraction (XRD) and particle size analysis.<strong></strong></p><p><strong>Results: </strong>Results of solubility study suggested that there was significant increase in solubility of ETO with increase in the concentration of PVP K30, Polyvinyl pyrrolidone K 90 (PVP K90) and HPB (*p&lt;0.05). This might be due to the solubilizing effect of PVP K30, PVPK90 and complex formation of ETO with HPB. Various combinations of PVP K30 and HPB prepared using DoE approach by spray drying method showed greater solubility of ETO than its physical mixtures (*p&lt;0.05). Results of FTIR, DSC, SEM, XRD and particle size analysis revealed the interaction between ETO, PVP K30 and HPB. This suggested formation of amorphous ternary system with mean particle diameter in the range of 763±1.35 nm.</p><p><strong>Conclusion: </strong>Combine use of PVP K30 and HPB with DoE approach was an effective tool for formulating ternary system of ETO.</p>

Synthesis of nano precipitated calcium carbonate by using a carbonation process through a closed loop reactor

2016 ◽  
Vol 68 (1) ◽  
pp. 131-137 ◽  
Author(s):  
Thenepalli Thriveni ◽  
Ji Whan Ahn ◽  
Chilakala Ramakrishna ◽  
Young Jun Ahn ◽  
Choon Han
Keyword(s):  
Calcium Carbonate ◽  
Closed Loop ◽  
Precipitated Calcium Carbonate ◽  
Loop Reactor ◽  
Carbonation Process

Study of Operational Conditions for the Precipitated Calcium Carbonate Production

2008 ◽  
Vol 591-593 ◽  
pp. 526-530 ◽  
Author(s):  
Eliane Cristina Silva Souto ◽  
João Jorge Ribeiro Damasceno ◽  
Carla Eponina Hori
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Process Conditions ◽  
Precipitated Calcium Carbonate ◽  
Carbonate Production ◽  
Operational Conditions ◽  
Slaked Lime

Calcium carbonate (CaCO3) is a natural occurring mineral or it can be produced by chemical means. This last product is often referred to as Precipitated Calcium Carbonate (PCC). PCC has various advantanges since it exhibits higher brightness and opacity. There can be considerable variation in the properties of the PCC depending upon the process conditions used to prepare it. In this work, the effect of different factors on the particle size of PCC has been investigated. The experiments were performed by bubbling CO2 in slaked lime suspensions. The pH of the lime slurry was 12 or higher at the beginning, but it decreased, down to an equilibrium pH of 8± 1, when the reaction was considered complete.

scholarly journals Preparation of Polyacrylate Hollow Microspheres via Facile Spray Drying

2019 ◽  
Vol 9 (2) ◽  
pp. 228 ◽  
Author(s):  
Pingxu Chen ◽  
Nanbiao Ye ◽  
Chaoxiong He ◽  
Lei Tang ◽  
Shuliang Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Spray Drying ◽  
Hollow Structure ◽  
Hollow Microspheres ◽  
Inlet Temperature ◽  
Feed Speed ◽  
Drying Method ◽  
Drying Process ◽  
Widespread Application ◽  
Hollow Structures

Polyacrylate microspheres with a hollow structure were prepared by a facile spray drying method. The effects of spray drying process parameters, including inlet temperature, atomizer rotational speed, and feed speed, on the particle size, bulk density, and morphology of the resultant polyacrylate hollow microspheres were investigated and discussed. The mechanism for the formation of the polyacrylate hollow microspheres was proposed. This facile and scalable method for preparing hollow polymer microspheres is expected to be valuable to prepare various polymer hollow structures for widespread application.

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