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Removal of ammonia in urea finishing

一种尿素、物理吸附的技术，应用在除去氨领域，能够解决没有解决氨解吸附吸附剂再生问题等问题

Active Publication Date: 2012-10-24
STAMICARBON BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Does not address the desorption of ammonia and the regeneration of the adsorbent

Method used

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  • Removal of ammonia in urea finishing

Examples

Experimental program
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Effect test

Embodiment

[0087] refer to figure 1 Schematic given, the exemplary process utilizes a baghouse filter with a pneumatic dust conveyor, a dust silo with a screw feeder, a mixing vessel, a rotary vacuum-filter, and a feeder with a bulk storage vessel.

[0088] The off-gas from the granulator of the urea production plant is mixed with a sorbent comprising water. To separate the sorbent from the air stream, baghouse filters are used. Here, all of the particulate urea is removed cocurrently with most of the ammonia in the gas phase. The former is removed by filtration and the latter is adsorbed on the adsorbent.

[0089] Ammonia adsorption is accomplished through a filter cake of adsorbent on the bag. Ammonia adsorption is similar to processes using fixed beds as the gas passes through the filter cake. The design goal is to remove greater than 90% of ammonia and greater than 99.95% of particulate urea. Because urea dust is removed in the baghouse filter, currently used scrubbers can be r...

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Abstract

Disclosed is a method for the removal of ammonia from the off-gas of a finishing section of a urea production plant. The method comprises contacting the off-gas with a solid adsorbent capable of physically adsorbing ammonia, particularly activated carbon or zeolite. Thereupon the solid adsorbent having ammonia adsorbed thereon is separated from the gas and regenerated by dissolving ammonia in an extraction liquid, preferably water. After separating the water from the solid adsorbent, the latter is re-used in the process.

Description

technical field [0001] The present invention belongs to the field of removal of ammonia from waste gases in the finishing section of a urea production plant. In particular, the present invention relates to reducing the continuous ammonia emissions that occur from the aftertreatment section of such a urea plant. Background technique [0002] Urea is made from ammonia and carbon dioxide. Today's urea production involves relatively clean processes with particularly low emissions of urea dust and ammonia. However, in addition to the chemical synthesis of urea, commercial-scale urea production requires that urea be provided in a suitable solid, granular form. To this end, urea production includes a post-processing step in which the urea melt is brought into the desired granular form, usually including any of prilling, granulation and pelletizing kind. [0003] Pelletization used to be the most common method, in which the urea melt was distributed in a prilling tower and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/04
CPCB01D2253/102B01D53/58B01D2253/108C07C273/04Y02P20/141Y02P20/582Y02A50/20
Inventor 约翰娜·伊利亚森Y·埃瑞克森戴维·霍姆斯特龙P·克里斯缇安·休特贝尔赫汉斯·T·卡尔森菲利佩·尼尔森弗里达·欧亚拉约翰·阿尔贝尔特·阿尔诺·范登蒂拉尔特
Owner STAMICARBON BV
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