Chemical engineering postgraduate personal statement example

Personal statement example

The sieve stack in our undergraduate teaching laboratory had seven trays, and for most of my final-year project I shook it by hand for ten minutes at a time. My project investigated how cooling rate affects the size of potassium nitrate crystals produced in a jacketed beaker. I prepared saturated solutions at a fixed starting temperature, cooled them at three different rates using the lab's recirculating water bath, then filtered, dried and sieved the product. The result I expected appeared clearly: faster cooling gave a larger share of fine crystals. What interested me more was how hard it was to make the runs repeatable. Two batches cooled at the same nominal rate gave noticeably different distributions. It took me some time to recognise that the moment nucleation began varied from run to run, and that a stray scratch on the beaker wall or a slightly different stirrer position could shift it.

That difficulty sent me to J. W. Mullin's Crystallization, and in particular to his discussion of supersaturation and the metastable zone. Reading about the balance between nucleation and growth gave me a way of explaining my scattered data rather than simply reporting it. In my write-up I proposed that a controlled seeding step would reduce the variation, and I ran two seeded batches in the final weeks. They were more consistent, though two runs are not enough to prove much, and I said so. I would like to study crystallisation and particle processes more rigorously at postgraduate level, alongside process control, because my project showed me how closely product quality depends on controlling conditions that are easy to overlook.

My degree gave me a solid grounding in thermodynamics, transport phenomena and reactor design. I enjoyed mass transfer most, partly because the separations coursework required us to work through problems from McCabe, Smith and Harriott's Unit Operations of Chemical Engineering in detail, and I found that working slowly through derivations suited me. Our group design project, a small plant for producing a bulk salt, put me in charge of the crystalliser and dryer section. Coordinating my mass balances with the teammate sizing the evaporator taught me to keep clear, shared assumptions, because one mismatched flow rate unsettled everyone's numbers.

Since graduating I have worked early shifts at a high-street bakery, which I began during my degree. The work is not chemical engineering, but it is batch production under time pressure. I weigh ingredients, manage proving times and load the deck ovens, and I have come to appreciate how much a consistent process depends on small habits: checking dough temperature, rotating trays, writing down when something changes. When the shop replaced one of its ovens, I kept a simple record of baking times for our main loaves over the first fortnight, which helped the manager settle the new settings faster than guesswork would have.

Outside work I swim with an open-water club through the year. Several of us log the lake temperature before each swim, and over two winters I have become the person who tidies that record into a spreadsheet. It is a modest task, but I like seeing patterns emerge from plain, regular measurements. I also help my younger brother with his GCSE maths most evenings. Explaining rearranging equations to someone who finds them frustrating has made me more patient and clearer in how I set out my own reasoning.

I am applying for a master's in chemical engineering because I want to move from reproducing a textbook trend in a beaker to understanding, and eventually designing, processes where that control matters at scale. I am careful, practical and comfortable with the repetitive work that good data needs, and I am keen to build the deeper theoretical and modelling skills that my project made me realise I lack.