BEST IELTS Academic Writing Task 1, 16th January

BEST IELTS Academic Writing Task 1, 16th January

IELTS Academic Writing Task 1
BEST IELTS Academic Writing Task 1, 16th January

The illustration highlights the main stages involved in the production of biodiesel from two main ingredients: vegetable oils and recycled greases.

This process starts when recycled greases are mixed with three key ingredients: sulphuric acid, methanol and biodiesel. This mixture then undergoes a process called dilute acid esterification which enables these products to be transformed chemically. The product from this is then mixed with three other ingredients: vegetable oils, methanol and KOH. Once they have been mixed together, transesterification then occurs, which results in the production of crude glycerin and crude biodiesel.

The crude glycerin is subsequently refined into glycerin as one of the end products of this manufacturing process. The by-products from the refining of glycerin then enter a methanol recovery stage where the methanol and KOH that are produced are once again fed back into the transesterification process. The crude biodiesel is then refined to produce biodiesel which either re-enters the dilute acid esterification process or is used in other ways.

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BEST IELTS Academic Writing Task 1, 16th January

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