Method for removing ammonia from a methanol containing stream

A methanol, liquid flow technology, applied in separation methods, chemical instruments and methods, ammonia preparation/separation, etc., can solve problems such as corrosion and process problems

Inactive Publication Date: 2009-08-05
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This accumulation can cause process problems and / or corrosion

Method used

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  • Method for removing ammonia from a methanol containing stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The following examples are based on gas flows produced in a commercial industrial process and simulated in ASPEN according to conventional methods using a proprietary thermodynamic package. The ammonia removal rate is sufficient to reduce fouling of Rectisol process equipment.

[0024] Base:

[0025] Feed stream to Rectisol unit 112MMSCFD (60F standard conditions)

[0026] Total flow of Claus unit 2.5MMSCFD (60F standard condition)

[0027] Methanol feed to the stripper 1.5GPM

[0028] N of the stripper 2 Stripping gas 13000SCFH (60F standard condition)

[0029] Level 8.0

[0030] Total NH removed 3 0.281bmol / hr

[0031] %NH in the stripper 3 Remove 40.4%

[0032] %HCN removal in the stripper 32.9%

[0033] Stream summary:

[0034] flow incoming liquid

Embodiment 2

[0036] The following example represents the same ammonia mass removal rate as in Example 1: 0.281 bmol / hr. In this example, however, the liquid methanol feed rate to the stripper was doubled, and the nitrogen stripping stripping flow was adjusted to maintain the same mass removal rate. Although the liquid feed rate doubles, the required N 2 The stripping flow was down 27%. The percent ammonia removal (relative to mass removal) decreased from 40.4% in Example 1 to 20.8% in Example 2. This example illustrates that a stripper can be optimized in different ways to achieve a predetermined removal rate, depending on the most important variables in a given plant.

[0037] Base:

[0038] Feed stream to Rectisol unit 112MMSCFD (60F standard conditions)

[0039] Total flow of Claus unit 2.5MMSCFD (60F standard condition)

[0040] Methanol feed to the stripper 3.0GPM

[0041] N of the stripper 2 Stripping gas 9500SCFH (60F standard condition)

[0042] Theoretical progression 8.0 ...

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Abstract

The invention relates to a method for eliminating ammonia from the stream containing methanol. A stream of liquid methanol containing ammonia and other species is sent to the top of a countercurrent stripping column. The stream is stripped with a flow of ambient-temperature nitrogen or another inert gas. The column can be packed with random dumped packing. The overhead vapor contains ammonia and the liquid exiting the column has a reduced amount of ammonia. Removing ammonia can reduce or prevent fouling or corrosion caused by ammonia (and other compounds).

Description

technical field [0001] The subject of the invention relates to reducing the concentration of ammonia in a stream containing methanol. Background technique [0002] Linde and Lurgi developed Rectisol in 1951 craft. For the purposes of the present invention, the phrase "Rectisol process" means a process capable of removing sulfur and sulfur-containing compounds such as hydrogen sulfide from industrial gas process streams such as those produced by coal gasification and other industrial processes. The Rectisol process typically operates at temperatures below 32F and employs organic solvents such as methanol to dissolve and remove sulfur-containing compounds from industrial gas process streams. The Rectisol process can also remove carbon dioxide, ammonia and other compounds from industrial process streams. The Rectisol process is described in more detail in Advances in Cyogenic Engineering, Vol. 15, Proceeding of the 1969 Cryogenic Engineering Conference, June 16-18, 1969. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C31/04C01C1/10B01D3/38B01D53/14C01B3/52C10K1/18
CPCB01D19/0015B01D2257/406B01D2257/408B01D2257/304B01D53/1462B01D53/1425B01D19/0005
Inventor C·R·希格登三世J·J·伯格T·L·贾库博夫斯基
Owner AIR PROD & CHEM INC
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