Preparation of Multi nitrate molten salt and its properties tests
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In this paper, by adding different additives in Solar Two molten salt in order to form multiple composite molten salts.And testing the thermal performance of mixture molten salt can be comparatively analysis of the modification effects of different additives.The melting point and latent heat of mixture molten salts were characterized by DSC.Through experimental and analysis results showed that additive-A can optimize the melting point and heat of fusion of molten salts, Additive-B and Additive-C have good effect only in melting point or melting heat unilaterally.By researching and improving performance of molten nitrate in order to promote the molten nitrate which play a more important role in thermal power generation and environmental protection.Reducing the melting point, in creasing the thermal stability limit, and enhancing the specific heat capacity of molten salt are the research hotspots in the field of medium and high temperature energy storage in recent years. From the perspectives of the melting point, thermal stability limit, and specific heat capacity of nitrates, we summarize the melting point, thermal stability limit, and specific heat capacity enhancement of molten salts with different compositions and ratios. The melting points of molten salt with different compositions and ratios are compared. Furthermore, the enhancing effect of various nanomaterials on molten salt is elucidated. The application of nitrate molten salt is also summarized to provide a reference for the research and application of novel molten salts. Keywords: Nitrate Molten Salt; Melting Point; Thermal Stability Limit; Specific Heat Capacity; Application
Thermal Stability
Heat stability
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Carbon atom
Carbon fibers
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Thermal Stability
Lithium nitrate
Thermogravimetric analysis
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The polymorphism characteristics of p-tert-octyl phenol was studied.It was found that after thermal treatment of differential scanning calorimetry(DSC), the melting point of p-tert-octyl phenol sample was about 75.0℃,lower than that of the untreated original sample which was 85.4℃.The fusion enthalpy of p-tert-octyl phenol decreased with increasing cooling rate of the thermal treatment.The samples before and after the thermal treatment of DSC were analyzed with DSC, FTIR spectroscopy,and powder X-ray diffraction.The results showed that through the thermal treatment, p-tert-octyl phenol generated a new crystalline form with a lower melting point and lower fusion enthalpy.The solid stability of the polymorphs was further studied.It was found that the two polymorphs belonged to monotropy.The α form with a higher melting point was stable at temperatures below its melting point.The β form with a lower melting point was metastable, which could convert into the α form at a low temperature.
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Abstract By use of the Clapeyron equation for the dependence of the melting point on pressure, the heat of fusion was found to be 32.5 cal/g, in good agreement with values determined by other methods. An equation for the dependence of the melting point on the degree of polymerization gave a heat of fusion of 27.6 cal/g when applied to hydroxyl‐terminated oligomers. This simple relation applied all the way down to the smallest member of the series, di(hydroxy ethyl) terephthalate.
Poly ethylene
Specific heat
Degree of polymerization
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Abstract The effect of microstructure on crystallizability of polyoctenamers prepared by R 3 Al‐WCl 6 catalyst was studied. The results indicate that polyoctenamers with a broad range of trans ‐vinylene content do crystallize. The measured melting points are dependent on the trans ‐vinylene content. From the dependence of melting temperature on copolymer composition, a value of 73 ± 2°C. for the melting point and a molar heat of fusion Δ H u of 3520 cal./mole are calculated for 100% trans ‐polyoctenamer. From the melting point depression in the presence of diluent, a value for Δ H u of 4800 cal./mole is obtained.
Melting-point depression
Diluent
Atmospheric temperature range
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Abstract Melting points of three polyamides, four polyesters, and their mixtures with diluents have been determined by application of dilatometry to observe the latent volume change during gradual melting extending over many days in each case. Heats of fusion were calculated from the depressions of the melting point by varying volume fractions of diluents. The results, given in °C. and in cal./g., respectively, are as follows: decamethylene sebacamide, 216°, 24.5; decamethylene azelamide, 214°, 27; the sebacamide of 1,10‐dipiperazyldecane, 129.5°, 34.5; decamethylene azelate, 69°, 31; nonamethylene azelate, 65°, 33; decamethylene terephthalate, 138°, 36; hexamethylene terephthalate 160.5°, 34. The results are compared with those previously reported for related polymers. A possible explanation is suggested for the fact that the heats of fusion of polyesters exceed those for the corresponding polyamides. High melting points appear to be associated with low entropies of fusion rather than with high heats of fusion.
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In this study, organic compounds with different structure were investigated, their latent heats of fusion, melting points and thermal stabilities were measured, and as the final step, trends in structure effect on compound properties were derived. The spectrum of measured compounds is wide including hydrocarbons and their derivatives such as alkanes, alcohols, amines, carboxylic acids, dicarboxylic acids, aromatic hydrocarbons etc. All measured results were transparently processed and arranged in charts and figures, so derived trends can be easily read. Both, the chain length and the functional group position on the hydrocarbon chain influence the melting point and latent heat value. Different phenomena, such as polymorphism of the alkanes or packing effect on the carboxylic acids, were observed. The melting point appears to increase with the chain length for most of the measured compounds. Such dependence has not been demonstrated in the effect of chain length on the latent heat value. Moreover, this paper is a source of thermodynamic data such as the latent heat of fusion, melting point, supercooling and thermic stability of different organic phase change materials within the melting temperature range between -5 – 80 °C.
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Phase-change material
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