Optimization and Characterization of Nano Aluminum Trihydrate-Based Flame-Retardant Materials in the Rotating Packed Bed Reactor

Chen, Pao Chi; Yang, Ling Chun

doi:10.4236/msa.2018.913075

Cited by 3 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second peak was also the most intensive and was 1.005 mW/mg. This was connected with alumina trihydroxide (AH3) phase decomposition [ 54 ]. The analysis was made in Proteus analysis software.…”

Section: Resultsmentioning

confidence: 99%

Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

2020

View full text Add to dashboard Cite

This paper presents the research data of the fire-temperature influence on Portland CEM I (OPC) and calcium sulfoaluminate (CSA) types of cement blend composites as cooling materials dedicated for infill and covers in fire systems. The data present the material responses for four types at high-temperature elevation times (0, 15, 30, 60 min), such as core heat curves, differences in specimens color, flexural and compressive strength parameters. Materials were tested using the DSC method to collect information about enthalpies. The differences between cement blend composites were compared with commonly used cooling materials such as gypsum blends. It is shown that modifications to Portland cement composites by calcium sulfoaluminate cement have a significant influence on the cooling performance during high-temperature, even for 60 min of exposure. The temperature increase rates in the material core were slower in composites with regards to additionally containing calcium sulfoaluminate in 100–150 °C range. After 60 min of high-temperature elevation, the highest flexural and compressive strength was 75% OPC/25% CSA cement composition. The influence on cooling properties was not related to strength properties. The presented solution may have a significant influence as a passive extinguisher solution of future fire resistance systems in civil engineering.

show abstract

Section: Resultsmentioning

confidence: 99%

Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

2020

View full text Add to dashboard Cite

show abstract

“…Alumina (Al 2 O 3 ) and its partial hydrates prove to be extremely valuable materials in many practical applications, usually as desiccants [1][2][3], fillers [4][5][6], adsorbents [7][8][9][10] for the removal of oil and grease from industrial waters [11], organic powder coatings [12][13][14], porous ceramics [15][16][17], high-temperature ceramic oxides [18][19][20], ceramic filtration membranes [21][22][23][24], and catalysts [25][26][27][28][29], only if the precursors are properly prepared and thermally treated [30][31][32]. Among the desired properties for these applications are a specific pore size and pore size distribution [33,34], a high specific surface area [35][36][37], and the degree of crystallinity, which also plays an essential role [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Al(OH)3 Part II—Effect of Different Thermal Treatments

Vasile

Dobra²,

Iliev

et al. 2021

Ceramics

View full text Add to dashboard Cite

In this paper, the thermal decomposition of crystalline Al(OH)3 was studied over the temperature range of 260–400 °C for particles with a size between 10 and 150 µm. The weight losses and thermal effects occurring in each of the dehydration process were assessed using thermogravimetry (TG) and differential scanning calorimetry (DSC) thermal analysis. X-ray diffraction (XRD) patterns, refined by the Rietveld method, were used for mineral phase identification, phase composition analysis, and crystallinity degree determination. Moreover, the particle size distributions and their corresponding D10, D50, and D90 numeric values were determined with a laser analyzer. We observed a strong relationship between the calcination temperature, the initial gibbsite grade particle size, and the crystallinity of the resulting powders. Hence, for all endothermic effects identified by DSC, the associated temperature values significantly decreased insofar as the particle dimensions decreased. When the gibbsite was calcined at a low temperature, we identified small amounts of boehmite phase along with amorphous new phases and unconverted gibbsite, while the powders calcined at 400 °C gradually yielded a mixture of boehmite and crystalized γ-Al2O3. The crystallinity % of all phase transition products declined with the increase in particle size or temperature for all the samples.

show abstract

CO2 Capture and Crystallization of ATH Using Sodium Aluminate Solution in a Bubble Column Scrubber

2022

View full text Add to dashboard Cite

In this work, sodium aluminate alkaline solution was used to capture CO2 in a continuous bubble column scrubber and aluminum tri-hydrate (ATH) precipitates were produced. As the sodium carbonate could be recycled after the filtrated solution was crystallized by evaporation, a novel CO2 capture process was developed successfully. There were five experimental operation variables, including solution flow rate (A), concentration of the solution (B), gas flow rate (C), CO2 gas concentration (D), and liquid temperature (E), with four levels to each variable. The influence of each variable on absorption efficiency (EF), absorption rate (RA), absorption factor (φ), mass transfer coefficient (KGa), and precipitation rate (RP) in a steady state was explored in this study. The Taguchi experimental design was adopted, and 16 experiments were performed; as the optimum operating conditions found in Taguchi analysis required further verification, there were a total of 21 experiments in the end. According to S/N analysis, the overall order of importance was D > A = B > C > E, meaning D (CO2 concentration) was most important and E (liquid temperature) was least important. In addition, the result also showed that the Rp was 1.25–2.0 times higher than the RA. The obtained powder was mainly ATH according to XRD analysis, with the crystal size ranging between 8.14 and 27.97 nm. However, the BET analysis showed its particle size range being 17.6–283.7 nm, indicating agglomeration for primary particles. The SEM analysis showed that there were flower-like, irregular, urchin-like, elongated, and amorphous particles. The solutions from five groups of optimum conditions were used to recycle the sodium carbonate experiments. After evaporation and crystallization of the filtrated solutions, the energy loading was found to be 1.70–2.56 GJ/t-solvent, illustrating the superiorities of low energy consumption. The precipitated powders were verified to be sodium carbonate by FTIR, which is a valuable constituent.

show abstract

Optimization and Characterization of Nano Aluminum Trihydrate-Based Flame-Retardant Materials in the Rotating Packed Bed Reactor

Cited by 3 publications

References 26 publications

Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

Thermally Activated Al(OH)3 Part II—Effect of Different Thermal Treatments

CO2 Capture and Crystallization of ATH Using Sodium Aluminate Solution in a Bubble Column Scrubber

Contact Info

Product

Resources

About