Haber process (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Haber process" in English language version.

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  • Clark 2013, "The forward reaction (the production of ammonia) is exothermic. According to Le Chatelier's Principle, this will be favoured at a lower temperature. The system will respond by moving the position of equilibrium to counteract this – in other words by producing more heat. To obtain as much ammonia as possible in the equilibrium mixture, as low a temperature as possible is needed". Clark, Jim (April 2013) [2002]. "The Haber Process". Retrieved 15 December 2018.
  • Clark 2013, "Notice that there are 4 molecules on the left-hand side of the equation, but only 2 on the right. According to Le Chatelier's Principle, by increasing the pressure the system will respond by favouring the reaction which produces fewer molecules. That will cause the pressure to fall again. To get as much ammonia as possible in the equilibrium mixture, as high a pressure as possible is needed. 200 atmospheres is a high pressure, but not amazingly high". Clark, Jim (April 2013) [2002]. "The Haber Process". Retrieved 15 December 2018.
  • Clark 2013, However, 400–450 °C isn't a low temperature! Rate considerations: The lower the temperature you use, the slower the reaction becomes. A manufacturer is trying to produce as much ammonia as possible per day. It makes no sense to try to achieve an equilibrium mixture which contains a very high proportion of ammonia if it takes several years for the reaction to reach that equilibrium".. Clark, Jim (April 2013) [2002]. "The Haber Process". Retrieved 15 December 2018.
  • Clark 2013, "Rate considerations: Increasing the pressure brings the molecules closer together. In this particular instance, it will increase their chances of hitting and sticking to the surface of the catalyst where they can react. The higher the pressure the better in terms of the rate of a gas reaction. Economic considerations: Very high pressures are expensive to produce on two counts. Extremely strong pipes and containment vessels are needed to withstand the very high pressure. That increases capital costs when the plant is built". Clark, Jim (April 2013) [2002]. "The Haber Process". Retrieved 15 December 2018.
  • Clark 2013, "At each pass of the gases through the reactor, only about 15% of the nitrogen and hydrogen converts to ammonia. (This figure also varies from plant to plant.) By continual recycling of the unreacted nitrogen and hydrogen, the overall conversion is about 98%". Clark, Jim (April 2013) [2002]. "The Haber Process". Retrieved 15 December 2018.

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  • "Ammonia". Industrial Efficiency Technology & Measures. 30 April 2013. Archived from the original on 2 October 2019. Retrieved 6 April 2018.

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