Ethyl lactate is one of the few solvents that is fully renewable, biodegradable, and non-toxic while still performing like the petroleum-based solvents it can replace. Its low toxicity and skin-friendly profile make it valuable beyond industrial cleaning and coatings: it is used in pharmaceuticals as a green solvent for drug formulation, controlled drug delivery, and as a chiral building block in drug synthesis, and in cosmetics and personal-care products such as creams, lotions, and fragrances. Most conventional solvents, by contrast, come from petroleum and are often toxic, volatile, and environmentally persistent, posing risks to workers and a growing regulatory burden. This project designs a full-scale plant to produce ethyl lactate from renewable lactic acid and ethanol. The scope is the complete process design — reaction, separation, and purification to 99.9% purity — plus the heat-integration, environmental, safety, and economic analyses needed to judge whether the plant is technically sound and commercially viable.
Ethyl Lactate - Commercial BioBased Green Solvent
Summary
Technical Approach/Methodology
Ethyl lactate is made by reacting lactic acid with ethanol in a reactive distillation column, which runs the reaction and separates the products in one unit. Surrounding columns recover and recycle unreacted feed, and an extractive distillation step uses ethylene glycol to break a hard-to-separate ethanol–water mixture. The process was modeled in Aspen Plus, heat-integrated by pinch analysis to eliminate the cooling utility, costed with the Aspen Capital Cost Estimator, and stress-tested for hazards with a Failure Modes and Effects Analysis (FMEA).
Outcomes
The project delivers a complete, simulation-backed design for a plant producing ~31,000 metric tons per year of 99.9% ethyl lactate. Deliverables: process flow diagrams and a heat-and-material balance across all five sections; a heat-integration study that removes the need for external cooling; an environmental assessment of the plant's air and water emissions with the governing regulations and mitigations; an FMEA-based safety analysis identifying top risks and controls; and a full economic analysis (capital cost, cost of production, cash flow, NPV, and IRR) showing the plant becomes financially strong once recovered ethanol is sold as a byproduct.