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The Ammonia Plant was designed and constructed by Chiyoda Engineering Corporation of Japan, with the process license from M/s. Haldor Topsoe, Denmark. The process license for the carbon dioxide recovery unit is from Ben Field Corporation of U.S.A. The Plant was commissioned in December 1983 and the hydrogen recovery unit, licensed by M/s. Costain, U.K was later added to the Plant in 1988, which enhanced the Plant design capacity to 1050 MTPD.
However with the sustaining efforts and the implementation of in house Modifications/Projects the capacity was enhanced to 1300 per day.
Raw natural gas is desulphurised and mixed with steam to produce hydrogen and carbon oxides in the reforming section. Air is introduced to supply the required nitrogen. Carbon monoxide is converted to carbon dioxide. This carbon dioxide is one of the raw materials for the production of Urea.
Residual carbon oxides are harmful for synthesis catalyst and hence are converted to Methane. Purging the gas controls the content of Methane in the synthesis loop. Hydrogen is recovered from this purge gas and feed back to synthesis section where the hydrogen and nitrogen react to form Ammonia which is removed by cooling and condensing and sent to the Urea Plant as a raw material for the production of Urea while the surplus is sent to storage facilities for export.
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