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Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide

A sour gas and hydrogen sulfide technology, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve expensive and other problems

Inactive Publication Date: 2009-09-02
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rigorous removal of hydrogen sulfide from an ammonium sulfate stream by charcoal filtration to ensure the absence of any hydrogen sulfide odor in the ammonium sulfate product is expensive and challenging

Method used

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  • Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide
  • Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide
  • Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] conduct figure 1 Computer modeling simulation of the method described in . A 143.3 lb mol / h (65 kgmol / h) sour water stripper containing 38.6 vol% ammonia (equivalent to 0.28 mass fraction) was used using recycled acid effluent (weak acid, including 5 wt% sulfuric acid) and fresh acid (98 wt% sulfuric acid) Scrubbing ammonia in the gas. Stream profiles and concentrations throughout the simulation for this example are shown in Table 1 below.

Embodiment 2

[0069] conduct figure 2 Computer modeling simulation of the method described in . Stripped from 143.3 lb mol / h (65 kg mol / h) of acidic water including 38.6 vol% ammonia (equivalent to 0.28 mass fraction) using recycled acid effluent (weak acid, including 5 wt% sulfuric acid) and fresh acid (98 wt% sulfuric acid) Ammonia scrubbing in tower gas. Flow profiles and concentrations throughout the simulation for this example are shown in Table 2 below.

Embodiment 3

[0071] conduct image 3 Computer modeling simulation of the method described in . Stripped from 143.3 lb mol / h (65 kg mol / h) of acidic water including 38.6 vol% ammonia (equivalent to 0.28 mass fraction) using recycled acid effluent (weak acid, including 5 wt% sulfuric acid) and fresh acid (98 wt% sulfuric acid) Ammonia scrubbing in tower gas. Flow profiles and concentrations throughout the simulation for this example are shown in Table 3 below.

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Abstract

The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced asan aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.

Description

Background of the invention [0001] Fluid streams including hydrogen sulfide and ammonia are produced in many industrial processes. For example, "sour water," which includes hydrogen sulfide and ammonia, is produced during refining through various water washing processes. Stripping of sour water to remove hydrogen sulfide and ammonia, producing "sour water stripper gas" (SWS gas), which generally contains approximately equal amounts of ammonia, hydrogen sulfide and water, but in addition to water vapor, hydrogen sulfide and trace hydrocarbons Ammonia may also be included up to 50% by volume. [0002] In most refineries, SWS gas is processed in a Claus Sulfur Recovery Unit (SRU) where ammonia is reduced to nitrogen and hydrogen. Not only is the potentially valuable fixed nitrogen content of the SWS gas lost in this process, but the operation of the SRU is negatively affected by the presence of ammonia in the feed (ie, the SWS gas). Negative effects on the SRU include increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/58C01C1/18C10K1/10C10L3/10
CPCC01C1/28B01D2251/512C10L3/102C10K1/102B01D2257/406C01C1/242C05B7/00C05C1/00B01D2257/304C10L3/10B01D2251/504C01B17/167B01D2251/506C01B17/04B01D53/58Y02A50/20C05D9/00C05C3/00C05C5/02
Inventor B·E·布莱克威尔L·A·楚M·达维斯W·B·埃利R·J·弗劳尔斯S·L·格里斯Z·B·特基
Owner EI DU PONT DE NEMOURS & CO
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