Chemical Recycling of Polycarbonate to Raw Materials by Thermal Decomposition with Calcium Hydroxide/Steam

2005 ◽  
Vol 34 (3) ◽  
pp. 282-283 ◽  
Author(s):  
Toshiaki Yoshioka ◽  
Katsuya Sugawara ◽  
Tadaaki Mizoguchi ◽  
Akitsugu Okuwaki
Keyword(s):  
Thermal Decomposition ◽  
Calcium Hydroxide ◽  
Raw Materials ◽  
Chemical Recycling

Consideration on Thermal Decomposition of Calcium Hydroxide Pellets for Energy Storage

1989 ◽  
Vol 111 (3) ◽  
pp. 245-250 ◽  
Author(s):  
I. Fujii ◽  
K. Tsuchiya ◽  
Y. Shikakura ◽  
M. S. Murthy
Keyword(s):  
Heat Transfer ◽  
Thermal Decomposition ◽  
Calcium Hydroxide ◽  
Thermal Stresses ◽  
Zinc Powder ◽  
Solar Thermal Energy ◽  
Mechanism Of Decomposition ◽  
Effect Of Additives ◽  
Nucleation Sites ◽  
Reversible Chemical Reaction

The reversible chemical reaction of Ca(OH)2/CaO appears to be attractive for storage of solar thermal energy, in view of the nonpolluting and nontoxic nature of the reactants. This paper presents some data on thermal decomposition of calcium hydroxide pellets along with its additives of aluminum, aluminum hydroxide, zinc, and copper. The addition of aluminum and zinc powder enhanced the rate of decomposition considerably at 450° C, but copper had no effect. Considerations on the effect of additives are also discussed in some detail, though their effects are not established with certainty. There is some evidence that heat transfer into the pellet, and the number of potential nucleation sites due to thermal stresses, influence the kinetics and mechanism of decomposition.

scholarly journals Structures and Properties of Self - crosslinking Silicone Resin

2018 ◽  
Vol 38 ◽  
pp. 02019
Author(s):  
Yong-xin Zhao ◽  
Ying-qiang Zhang
Keyword(s):  
Thermal Decomposition ◽  
Raw Materials ◽  
Decomposition Temperature ◽  
Light Transmittance ◽  
Silicone Resin ◽  
Structures And Properties ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Good Heat Resistance ◽  
Good Heat

Highly transparent silicone resin with self-crosslinking structure was prepared using phenyltrimethoxysilane, diphenyldimethoxysilane, 1,3,5,7-cyclotetra(methyl siloxane) and bisvinyltetramethyldisiloxane as main raw materials. The structure of silicone resin was determined by Fourier Transform Infrared Spectroscopy (FT-IR). The light transmittance was measured by UV-Vis spectroscopy. Thermogravimetric analysis (TGA) was used to study the thermal decomposition process. The microstructure of cured self-crosslinking silicone resin is more uniform, resulting in better light transmittance up to 100% in the range of 400nm ~ 800nm. The cured has relatively good heat resistance, the initial thermal decomposition temperature of the cured could be up to 315.8 °C. SEM observations show that the self-crosslinking silicone has a uniform, textured structure, higher transparency compared with the existing condensation silicone material, and can be used as advanced architectural translucent materials and optics packaging materials.

Studied Catalysis of CuO Nanocrystal on KClO4 Decomposition

2011 ◽  
Vol 335-336 ◽  
pp. 128-131
Author(s):  
Shu Hong Ba ◽  
Zhen Xing Sun ◽  
Zhe Zhang ◽  
Chun Hong Zhang
Keyword(s):  
Thermal Decomposition ◽  
Raw Materials ◽  
Decomposition Temperature ◽  
Phase Reaction ◽  
Crystal Shape ◽  
Spherical Nanoparticles ◽  
Shape Transformation ◽  
Cupric Nitrate ◽  
Ft Ir ◽  
Liquid Phase Reaction

CuO nanocrystal has been successfully synthesized by adopting liquid phase reaction and using cupric nitrate and sodium hydroxide as raw materials. The prepared products are characterized by XRD, FT-IR and TEM. The catalysis of CuO Nanocrystal on KClO4 is investigated by thermal analysis. The results show that CuO nanocrystal is consisted of the mixture of spherical nanoparticles with an average sizes of 11nm. The catalysis of CuO nanocrystal on KClO4 thermal decomposition was strong. And it makes thermal decomposition temperature of KClO4 to decrease 97.7 °C, the decalescence amount also reduced to 79.07 J/g. But the addition of CuO nanocrystal has no effect on the crystal shape transformation of KClO4.

Preparation of Delafossite CuYO2 by Metal-citric Acid Complex Decomposition Method

2009 ◽  
Vol 1166 ◽  
Author(s):  
Keishi Nishio ◽  
Tomomi Okada ◽  
Naoto Kikuchi ◽  
Satoshi Mikusu ◽  
Tsutomu Iida ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Citric Acid ◽  
Single Phase ◽  
Raw Materials ◽  
Chelating Agent ◽  
Amorphous Powder ◽  
Heat Treating ◽  
Acid Complex ◽  
Synthesis Conditions ◽  
Starting Solution

AbstractDelafossite CuYO2 and Ca doped CuYO2 were prepared by thermal decomposition of a metal-citric acid complex. The starting solution consisted of Cu acetate, Y acetate and Ca acetate as the raw materials. Citric acid was used as the chelating agent, and acetic acid and distilled water were mixed as a solvent. The starting solutions were heated at 723 K for 5 h after drying at 353 K. The obtained powders were amorphous and single phase of orthorhombic Cu2Y2O5 was obtained by heat-treated the amorphous powder at a temperature range between 1073 and 1373 K for 3 h in air. Furthermore, Heat-treating the obtained orthorhombic Cu2Y2O5 at above 1373 K in air caused it to decompose into Y2O3, CuO and Cu2O. On the other hand, the sample powder prepared from a starting solution without citric acid, i.e., single phase of orthorhombic Cu2Y2O5 could not be obtained under the same synthesis conditions as that for a solution with citric acid. We were able to obtain delafossite CuYO2 and Ca doped CuYO2 from orthorhombic Cu2Y2O5 under a low O2 pressure atmosphere at above 1223 K. The obtained delafossite CuYO2 composed hexagonal and rhombohedral phases. The color of the CuYO2 powder was light brown and that of Ca-doped CuYO2 was light green. Diffraction peaks in the XRD pattern were slightly shifted by doping Ca for CuYO2, and these peaks shifted toward to a high diffraction angle with an increasing amount of doped Ca. From these results, we concluded that Ca doped delafossite CuYO2 could be obtained by thermal decomposition of a metal-citric acid complex.

Influence of Heating Rate and Burning Temperature on the Thermal Decomposition of Textile Sludge

2012 ◽  
Vol 727-728 ◽  
pp. 1005-1009
Author(s):  
M.E.D. Altidis ◽  
Crislene Rodrigues da Silva Morais ◽  
B.F.R. Guedes ◽  
Pablo Araújo Rodrigues ◽  
M.A.F. Souza
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Infrared Spectrum ◽  
Raw Materials ◽  
Sewage Treatment ◽  
Human Action ◽  
Waste Generation ◽  
Burning Temperature ◽  
Textile Sludge

The generation of waste is a consequence of human action as a result of user and processor of raw materials. In effluents textiles sewage treatment, waste generation, especially the sludge, is a constant making it necessary to use alternatives for its management. This work aims to study the influence of the burning temperature on the thermal decomposition of textile sludge by Thermogravimetry and Differential Thermal Analysis in order to use it as an additive in concrete and / or pre-molded. The TG curves of textile sludge burned at temperatures of 110°C, 400°C, 450°C, 500°C, 550°C and 600°C showed at two to three steps of thermal decomposition. The infrared spectrum showed characteristic bands of SiO2, OH and CH and the spectrum of the sinterized sludge showed the elimination of OH and CH bands.

Preparation of Novel Foaming Agent and its Application in Foam Concrete

2013 ◽  
Vol 785-786 ◽  
pp. 305-307 ◽  
Author(s):  
Dong Lin ◽  
Qin Zhao ◽  
Gui Ge Hou ◽  
Juan Juan Zhao ◽  
Jing Tian Han
Keyword(s):  
Thermal Conductivity ◽  
Calcium Hydroxide ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Expansion Rate ◽  
Foam Concrete ◽  
Foaming Agent ◽  
The Stability

A novel foaming agent was prepared using animal hoof and horn as raw materials via calcium hydroxideas a catalyzer and the performanc of the product was measured. The results show that the expansion rate of foaming agent can be more than 20 times, and the stability of foaming is very excellent. The foaming agent was used for preparing foam concrete and the performanc of the foam concrete was also tested. The results show that the thermal conductivity can be kept between 0.055 and 0.234 W/(m·k), and the foam concrete possesses light masses, little density and well thermal insulation.

Preparation of High-Purity Magnesium Aluminate Spinel Powder by Thermal Decomposition Method

2016 ◽  
Vol 697 ◽  
pp. 23-26
Author(s):  
Xiao Juan Wu ◽  
Jun Shou Li ◽  
Xiang Jun Tang ◽  
Ming Yuan Wang ◽  
Su Li
Keyword(s):  
Thermal Decomposition ◽  
Particle Size ◽  
High Purity ◽  
Inductively Coupled Plasma ◽  
Raw Materials ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Magnesium Aluminate ◽  
Plasma Atomic Emission Spectrometry ◽  
Spinel Powder

A precursor was obtained after dissolution, drying and cooling using MgSO4·7H2O and NH4Al (SO4)2·12H2O as raw materials. Then the high-purity magnesium aluminate (MgAl2O4) spinel powder was synthesized via the thermal decomposition process of the precursor calcined at different temperatures. The phase, morphology and particle size of the powder obtained at different calcining temperatures were characterized by X-ray diffraction, scanning electron microscopy and laser particle size analyzer. And also the purity of the powder was tested by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The results show that the powder exhibits better crystalline shape and bigger crystalline size with the calcining temperature increasing. The calculated grain size is below 30 nm according to Scherrer formula. The particle size of the powder is below 35μm, the particle size distribution is relatively wide and some particles reunite to be bigger ones with the calcining temperature rising. The powder appears to be plate-shaped and the morphology of the grain is irregular particle. The purity of the powder is relatively high. Especially, the purity of the powder obtained at 1150 °C is 98.88%.

Synthesis and Characterization of Rodlike Ammonium Tetrathiomolybdate and its Thermal Decomposition Mechanism

2011 ◽  
Vol 287-290 ◽  
pp. 2049-2052 ◽  
Author(s):  
Jun Zhang ◽  
Su Ping Hu ◽  
Yu Li Feng ◽  
Bo Xu ◽  
Yan Hui Guo
Keyword(s):  
Thermal Decomposition ◽  
Raw Materials ◽  
Decomposition Mechanism ◽  
Laser Raman Spectroscopy ◽  
Thermal Decomposition Mechanism ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Ammonium Sulfide ◽  
Ammonium Tetrathiomolybdate ◽  
Ammonium Dimolybdate

Rodlike ammonium tetrathiomolybdate has been synthesized via ultrasonic assistance using monocrystal ammonium dimolybdate and ammonium sulfide as raw materials. The phase compositions, purity of as-synthesized products were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser Raman spectroscopy(LRS). The thermal decomposition mechanism of ammonium tetrathiomolybdate was deduced by thermoanalysis. It is shown that brownish-red rhombic ammonium tetrathiomolybdate crystal with high purity could be obtained at 60°C for 1h under relatively mild conditions.

Kinetics of the thermal decomposition of calcium hydroxide

1966 ◽  
Vol 21 (4) ◽  
pp. 394-404 ◽  
Author(s):  
R.Sh. Mikhail ◽  
Stephen Brunauer ◽  
L.E. Copeland
Keyword(s):  
Thermal Decomposition ◽  
Calcium Hydroxide ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document