Polyacrylic acid reaction polymerization enthalpy change determination process based on micro-reaction calorimeter

• Main Authors: MA YINGYING, REN YANHAO, YE QILIANG
• Format: Patent
• Language: Chinese; English
• Published: 13.05.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a polyacrylic acid reaction polymerization enthalpy change determination process based on a micro-reaction calorimeter, which comprises the following steps: forming a continuous flow micro-reaction calorimeter through the combination of a micro-channel reaction module, a local calorimetric module, a connecting fitting and a material conveying device; preparing a reaction solution; feeding the prepared sodium pyrosulfite solution, sodium persulfate solution and acrylic acid solution into a continuous flow microcalorimeter by using three pipelines with different sizes; preheating reactants; mixing and reacting; the temperature in the reaction process and the heat released by the reaction are converted into electric signals; at 70 DEG C, allowing hot start of sodium persulfate to produce free radicals which interact with acrylic acid in the solution; and calculating the yield of polyacrylic acid in the reaction system under the condition of different contents of initiators through a nucle