Laboratory Chemical Reagent Aluminum Sulfate will undergo a series of significant changes during the heating process. These changes are not only related to temperature, but also closely related to its physical and chemical properties. The following is a detailed analysis of the changes that may occur in Laboratory Chemical Reagent Aluminum Sulfate during the heating process:
Dehydration reaction:
When Laboratory Chemical Reagent Aluminum Sulfate is heated to a lower temperature, such as 62.5°C, it begins to undergo a dehydration reaction. This process is an endothermic process, and Laboratory Chemical Reagent Aluminum Sulfate gradually loses crystal water, causing its physical state to change.
As the temperature further increases, at about 92.5°C, Laboratory Chemical Reagent Aluminum Sulfate begins to dissolve in the removed crystal water, forming a more stable anhydrous form.
Phase changes and heat release:
When heated to 170-300°C, Laboratory Chemical Reagent Aluminum Sulfate will show an exothermic peak, which is caused by the phase change accompanying the previous dehydration process. This phase transition may be from one crystalline form to another, more stable, crystalline form.
Structural dislocations and lattice shifts:
Laboratory Chemical Reagent Aluminum Sulfate may show small endothermic peaks when the temperature reaches 480℃ and 640℃. This is usually due to the structural dislocation produced by K2SO4·AI2(SO4)3 or the lattice movement of Laboratory Chemical Reagent Aluminum Sulfate itself. These changes can affect the physical and chemical properties of Laboratory Chemical Reagent Aluminum Sulfate.
Decomposition reaction:
When the temperature continues to rise to 855°C, Laboratory Chemical Reagent Aluminum Sulfate will undergo a decomposition reaction. This is a significant endothermic process in which Laboratory Chemical Reagent Aluminum Sulfate decomposes into aluminum oxide (Al2O3) and sulfuric acid vapor (SO3). This reaction is a typical thermal decomposition reaction and one of the most important chemical changes in Laboratory Chemical Reagent Aluminum Sulfate during the heating process.
Conversion of aluminum oxide:
As the temperature further increases, for example, when it reaches 885°C, the anhydrous Laboratory Chemical Reagent Aluminum Sulfate will further decompose to generate γ-Al2O3. When the temperature exceeds 1100°C, γ-Al2O3 begins to transform into α-Al2O3. At 1200°C, the α phase and the γ phase coexist. At higher temperatures, γ-Al2O3 will be completely converted into α-Al2O3.
In summary, Laboratory Chemical Reagent Aluminum Sulfate will undergo a series of complex changes such as dehydration, phase change, structural dislocation, lattice movement and decomposition during the heating process. These changes not only affect the physical state of Laboratory Chemical Reagent Aluminum Sulfate, but also affect its chemical properties and uses. Therefore, when heating Laboratory Chemical Reagent Aluminum Sulfate, the temperature needs to be strictly controlled to avoid unnecessary losses or the generation of harmful by-products.
