Purification Technology Edition: Daily Question [October 9, 2017]
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Where does corrosion in the low-temperature methanol washing system mainly occur? What precautions should be taken during operation? Answer: The corrosion in the low-temperature methanol washing system is mainly concentrated in the pipelines from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. Hydrogen sulfide and water present in the transfer pipeline can easily cause corrosion of the system; therefore, stainless steel is used for this section. In the regeneration tower, the high concentration of hydrogen sulfide and high temperatures also lead to corrosion, so it is essential to control the water content in methanol during operation ； High water content in the regeneration tower can cause severe corrosion. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases; in addition, high-temperature corrosion is inevitable, which is why some processes involve the addition of alkalis to reduce corrosion.
The corrosion in the low-temperature methanol washing system is mainly concentrated in the pipelines from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. Hydrogen sulfide and water present in the transfer pipeline can easily cause corrosion of the system; therefore, stainless steel is used for this section. In the regeneration tower, the high concentration of hydrogen sulfide and high temperatures also lead to corrosion, so it is essential to control the water content in methanol during operation ； High water content in the regeneration tower can cause severe corrosion. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases; in addition, high-temperature corrosion is inevitable, which is why some processes involve the addition of alkalis to reduce corrosion.
Corrosion is mainly concentrated in: the pipeline from the shift gas to the raw material gas cooler inlet, as well as the regeneration tower and the methanol-water separation tower. The transfer pipeline is exposed to hydrogen sulfide and water, which can cause corrosion; therefore, stainless steel is used for the materials in this section of the system. The regeneration tower, on the other hand, has high concentrations of hydrogen sulfide and high temperatures, conditions that also lead to corrosion. During operation, it is important to keep a tight control on the water content in methanol; high water content can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases, and the high temperature makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The last edit to this post was made by vshdybhs on 2017-10-9 at 10:31. Corrosion in the low-temperature methanol washing system occurs mainly in the pipelines from the shift gas to the feed gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. Hydrogen sulfide and water present in the transfer pipeline can easily cause corrosion of the system; therefore, stainless steel is used for this section. In the regeneration tower, the high concentration of hydrogen sulfide and high temperatures also lead to corrosion, so it is essential to control the water content in methanol during operation ； High water content in the regeneration tower can cause severe corrosion. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases; in addition, high-temperature corrosion is inevitable, which is why some processes involve the addition of alkalis to reduce corrosion.
The corrosion in the low-temperature methanol washing system is mainly concentrated in the pipelines from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. Hydrogen sulfide and water present in the transfer pipeline can easily cause corrosion of the system; therefore, stainless steel is used for this section. In the regeneration tower, the high concentration of hydrogen sulfide and high temperatures also lead to corrosion, so it is essential to control the water content in methanol during operation ； High water content in the regeneration tower can cause severe corrosion. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases; in addition, high-temperature corrosion is inevitable, which is why some processes involve the addition of alkalis to reduce corrosion.
Corrosion is mainly concentrated in: the pipeline from the shift gas to the raw material gas cooler inlet, as well as the regeneration tower and the methanol-water separation tower. The transfer pipeline is exposed to hydrogen sulfide and water, which can cause corrosion; therefore, stainless steel is used for the materials in this section of the system. The regeneration tower, on the other hand, has high concentrations of hydrogen sulfide and high temperatures, conditions that also lead to corrosion. During operation, it is important to keep a tight control on the water content in methanol; high water content can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases, along with high temperatures; thus corrosion is inevitable. In some processes, alkalis are added here to reduce corrosion.
Corrosion is mainly concentrated in: the pipeline from the shift gas to the raw material gas cooler inlet, as well as the regeneration tower and the methanol-water separation tower. The transfer pipeline is exposed to hydrogen sulfide and water, which can cause corrosion; therefore, stainless steel is used for the materials in this section of the system. The regeneration tower, on the other hand, has high concentrations of hydrogen sulfide and high temperatures, conditions that also lead to corrosion. During operation, it is important to keep a tight control on the water content in methanol; high water content can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases, along with high temperatures; thus corrosion is inevitable. In some processes, alkalis are added here to reduce corrosion.
The corrosion in the low-temperature methanol washing system is primarily concentrated in 1. the pipeline from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. There is hydrogen sulfide and water present in the transfer pipeline, which can easily cause corrosion of the system; therefore, stainless steel should be used for materials in this area. 2. In the regeneration tower, the high concentration of hydrogen sulfide and high temperatures also lead to corrosion. Hence, it is essential to control the water content in methanol during operation – high water content can cause severe corrosion in the regeneration tower. 3. In the methanol-water separation tower, is there water along with carbon dioxide-containing acidic gases? Is the temperature also high? Corrosion is difficult to avoid; some processes add alkali at this stage to reduce corrosion.
Corrosion mainly occurs in the pipeline from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. During operation, it is essential to control the water content in methanol
Corrosion is mainly concentrated in: the pipeline from the conversion gas to the raw material gas cooler inlet, as well as the regeneration tower and the methanol-water separation tower. The transfer pipeline is exposed to hydrogen sulfide and water, which can cause corrosion; therefore, stainless steel is used for the materials in this section of the system. The regeneration tower, on the other hand, has high concentrations of hydrogen sulfide and high temperatures, conditions that also lead to corrosion. It should be noted during operation that the water content in methanol must be carefully controlled; a high water content can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases, along with high temperatures; thus corrosion is inevitable. In some processes, alkalis are added here to reduce corrosion.
The corrosion in the low-temperature methanol washing system is mainly concentrated in the pipelines from the shift gas to the raw material gas cooler inlet, as well as in the regeneration tower and the methanol-water separation tower. The transfer pipeline is exposed to hydrogen sulfide and water, conditions that facilitate corrosion; therefore, stainless steel is used as the material in this section of the system. The regeneration tower, on the other hand, has high concentrations of hydrogen sulfide and high temperatures, which also lead to corrosion. It is thus essential to control the water content in methanol carefully during operation, as high water levels can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases, along with high temperatures; thus corrosion is inevitable. In some processes, alkalis are added here to reduce corrosion.