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© www.chemsheets.co.uk GCSE 112 18-Jul-13. NH 3 PRODUCTION OF AMMONIA NH 3 Millions of tonnes per year.

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Presentation on theme: "© www.chemsheets.co.uk GCSE 112 18-Jul-13. NH 3 PRODUCTION OF AMMONIA NH 3 Millions of tonnes per year."— Presentation transcript:

1 © GCSE Jul-13

2 NH 3

3 PRODUCTION OF AMMONIA NH 3 Millions of tonnes per year

4 cleaning fluid fertiliser MAKING AMMONIA

5 RAW MATERIALS N 2 (g) + 3 H 2 (g)  2 NH 3 (g) air methane + steam ammonianitrogenhydrogen © GCSE Jul-13

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7 MAKING AMMONIA N 2 (g) + 3 H 2 (g)  2 NH 3 (g) exothermic endothermic 4 molecules 2 molecules more pressure less pressure © GCSE Jul-13

8 MAKING AMMONIA

9 N 2 (g) + 3 H 2 (g)  2 NH 3 (g) Temperature450ºCLower temperature → more NH 3 Reaction exothermic Higher temperature → faster Compromise between yield & rate Pressure200 atmHigher pressure → more NH 3 4 molecules → 2 molecules Higher pressure → very expensive Compromise between yield & cost CatalystironSpeeds up reaction No effect on yield of NH 3 © GCSE Jul-13

10 MAKING AMMONIA N 2 (g) + 3 H 2 (g)  2 NH 3 (g) NH 3 is removed by cooling (forms a liquid). Less than 30% yield, so the unreacted H 2 and N 2 are recycled. © GCSE Jul-13

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