Performance Evaluation of Composite Antisalt Agents and the Antisalt Dynamics Simulation Mechanism

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Conventional ferrocyanide complexes ([Fe(CN)₆]^4-) are effective scale inhibitors but degrade at high temperatures, complicating wastewater treatment.
• Oxidation of ferrocyanide at elevated temperatures necessitates alternative solutions for scale inhibition in industrial processes.

Purpose of the Study:

• To synthesize and characterize a novel antisalt composite for high-temperature scale inhibition.
• To evaluate the performance of the aminotriacetamide (NTA)-based composite with polyaspartic acid (PASP) and sodium dodecyl benzene sulfonate (SDBS).

Main Methods:

• Synthesis of aminotriacetamide (NTA) using chloroacetic acid.
• Molecular structure characterization via FT-IR spectroscopy, H-NMR, and TGA.
• Evaluation of antisalt composite performance at 100 °C.
• Molecular simulation to determine binding energies and deformation strengths.

Main Results:

• The antisalt composite increased solubility by 95.6% and inhibition rate by 12.33% at 100 °C with increasing concentration.
• Molecular simulations showed binding energy order: SDBS > NTA > PASP, and deformation strength order: NTA > PASP > SDBS.
• The composite inhibited salt precipitation via strong adsorption of NTA and SDBS with sodium chloride crystals, altering crystal form and improving solubility.

Conclusions:

• The NTA-based antisalt composite offers superior high-temperature performance compared to traditional inhibitors.
• The composite effectively hinders salt precipitation by modifying crystal structure and enhancing solubility.
• This development presents a promising solution for scale inhibition in challenging industrial wastewater treatment scenarios.