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The cold
synthesis gas depleted in deuterium from the first exchange tower, before its return to
Ammonia Plant, is heated by the incoming feed gas from the same plant and is passed
through an ammonia synthesis unit. In this unit, a portion of the synthesis gas equivalent
to the amount of the ammonia cracked in the crackers is converted to ammonia and fed back
to top of the first exchange tower. The rest of the depleted synthesis gas equivalent to
the feed gas supplied is returned to Ammonia Plant. |
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Some of the special features of the plant include the following: i) This plant operates at a high pressure of 250 Kg/Sq. Cm. The
operation at high pressure involves thick wall, multi-layer vessel construction and since
these towers are operated at low temperatures, this involves use of special materials
capable of withstanding such low temperatures. ii) For achieving intimate mixing of the synthesis gas with liquid ammonia and thus promoting efficient extraction of deuterium from the synthesis gas, specially developed ejector trays are used in the isotopic exchange towers.Since the use of this type of trays leads to high pressure drop in the Exchange Tower, it becomes necessary to use submersible (canned motor) pumps in each tray for the transfer of liquid ammonia from one stage to the other. iii) High pressure and high temperature cracking of deuterium rich ammonia employed in this plant, requires use of special material of construction and sophisticated fabrication techniques for avoiding loss of deuterium. |
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