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Journal of Modern Chemistry & Chemical Technology Review Article

Quantitative Mass Balance Modelling for the Synthesis and Production of Ten High-Volume Insecticides

  1. Ashok K. Rathoure Chaitanya Climate Research Inc. Surat
  2. Anika Rathoure Chaitanya Climate Research Inc. Surat

Abstract

This study presents a detailed quantitative mass balance analysis for the industrial synthesis and production of ten high-volume insecticides: acequinocyl, acetamiprid, acynonapyr, alpha-cypermethrin, benzpyrimoxan, bifenazate, bifenthrin, bistrifluron, broflanilide, and bromofos, focusing on material flows, process efficiencies, and environmental implications. These compounds, spanning diverse chemical classes like neonicotinoids, pyrethroids, and meta-diamides, are essential for crop protection but pose challenges due to resource-intensive syntheses and waste generation. For each insecticide, standardized manufacturing routes are modeled to yield 1 t of product, incorporating reaction chemistries (esterifications, nucleophilic substitutions, acid chloride activations), stoichiometric reactant quantities, byproducts (HCl, SO₂, salts), solvent usage (toluene, ethyl acetate), and waste streams. Calculations assume 1:1 molar ratios and near-theoretical yields, with inputs ranging from 5,444 kg (Benzpyrimoxan) to 17,803 kg (Broflanilide), dominated by solvents (up to 6,647 kg toluene) and water (up to 10,000 kg). Outputs include the target product, recovered solvents (e.g., 95% toluene recovery), losses (23–157 kg), effluents to treatment plants (up to 10,270 kg), and hazardous residues (6–613 kg) managed under regulatory frameworks like Rule 9. Key insights reveal solvent-heavy batch processes contributing 50–80% of inputs, halogenated byproducts (HCl: 30– 544 kg; NaCl: up to 390 kg) amplifying toxicity risks, and multi-step syntheses (Broflanilide's four stages) exacerbating cumulative wastes. Efficiencies are evident in high mass conservation, but real-world losses from side reactions could inflate environmental footprints by 5–15%. Aligning with literature on pesticide persistence (e.g., neonicotinoid aquatic contamination), the models underscore opportunities for sustainability: catalytic alternatives to phosgene derivatives, continuous-flow reactors for solvent reduction, and waste valorization (HCl recycling). This analysis equips process engineers, regulators, and stakeholders with tools for life-cycle assessments, fostering greener agrochemical production to balance food security with ecological stewardship.

Keywords

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