Turning raw materials into fuels, chemicals, medicines, and food — safely and at scale.
Chemical and process engineering is the discipline of designing, operating, and optimizing the processes that transform raw materials into useful products — fuels, plastics, pharmaceuticals, fertilizers, foods, and specialty chemicals — by combining chemistry, physics, and economics with the rigorous accounting of mass, energy, and momentum.
Chemical engineering takes chemistry out of the beaker and scales it up to plants that run continuously for years. Where a chemist discovers that a reaction works, the chemical engineer answers the harder questions: how do we make a thousand tonnes a year, at what cost, with what yield, using how much energy, and without hurting anyone or the environment? The unifying idea is the conservation of mass and energy: every analysis begins by drawing a boundary around a unit, a process, or a whole plant and writing balances of what comes in, what goes out, what accumulates, and what is generated or consumed.
The field rests on a small set of powerful pillars applied over and over. Material and energy balances are the bookkeeping that ties every process together. Thermodynamics tells us what is possible — phase equilibria, reaction equilibria, and the energy required or released. Transport phenomena — the coupled flow of momentum (fluid mechanics), heat, and mass — govern how fast things actually happen inside equipment. Reaction engineering combines kinetics with reactor design to size vessels and choose operating conditions. Separations (distillation, absorption, extraction, membranes, crystallization) recover and purify products, and typically dominate a plant’s capital and energy cost. Process control keeps the whole system stable and on-spec, and process safety — informed by hard lessons like Flixborough and Bhopal — is woven through every design decision. Chemical engineers work across oil & gas, refining, petrochemicals, pharmaceuticals, food and beverage, semiconductors, materials, and increasingly batteries, hydrogen, and carbon capture.
The foundational accounting of every process: steady-state and transient balances, recycle and purge, combustion, and degree-of-freedom analysis.
Phase and chemical equilibria, equations of state, activity coefficients, vapor pressure (Antoine), and the energy balances that drive heating, cooling, and work.
Pipe flow, the Reynolds number and flow regimes, friction and pressure drop, Bernoulli’s equation, pumps, NPSH, and compressible flow.
Conduction, convection, and radiation; heat-exchanger design and rating (LMTD and effectiveness-NTU); condensers, reboilers, and heat integration.
Distillation, absorption and stripping, liquid-liquid extraction, adsorption, membranes, drying, and crystallization — the heart of product purification.
Reaction kinetics, batch/CSTR/PFR reactor design, conversion and selectivity, catalysis, and the energy management of exothermic reactions.
Dynamics, feedback and PID control, cascade and ratio strategies, controller tuning, instrumentation, and reading P&IDs.
HAZOP and LOPA, relief and flare design, OSHA PSM, CCPS risk-based process safety, and inherently safer design.
A chemical engineer designs, operates, and improves the processes that convert raw materials into products at industrial scale. Day to day that means writing material and energy balances, applying thermodynamics to set operating conditions, sizing pumps, heat exchangers, reactors, and distillation columns, building and tuning control strategies, and leading process-safety reviews — all to make a product at the required purity, yield, cost, and safety. Many use simulators like Aspen Plus or HYSYS to model whole plants.
A chemist studies and discovers reactions and materials, usually at lab scale, focused on what happens and why. A chemical engineer scales that chemistry up to a process that runs economically and safely at thousands of tonnes per year — handling heat removal, separations, fluid flow, control, and safety. Put simply, the chemist invents the reaction; the chemical engineer turns it into a plant.
Unit operations are the standardized physical building blocks of a process — distillation, absorption, extraction, heat exchange, filtration, drying, crystallization, mixing, and fluid transport. The insight, dating to the early 20th century, is that the same handful of operations recur across very different industries, so a chemical engineer who understands distillation can apply it to refining, pharma, or food alike.
Yes. NCEES offers the FE Chemical exam (the first step, usually taken near graduation) and the PE Chemical exam for licensure after about four years of qualifying experience. Licensure is less universal in chemical engineering than in civil engineering because much process work happens inside companies rather than as stamped public-facing designs, but the PE is valued for consulting, public-safety roles, and senior process responsibility.
Chemical plants handle large inventories of flammable, toxic, or reactive materials under pressure and temperature, so a loss of containment can be catastrophic — disasters like Flixborough and Bhopal reshaped the profession. Process safety embeds systematic hazard analysis (HAZOP, LOPA), relief and flare design, and management systems such as OSHA Process Safety Management (29 CFR 1910.119) and CCPS risk-based process safety into every design, so hazards are engineered out or controlled rather than discovered the hard way.