Purification Technology Edition: Daily Question [October 11, 2017]
Thread Content
Where does corrosion in the low-temperature methanol washing system occur mainly, and what should be noted 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 cause corrosion; therefore, stainless steel is used as the material for this section of the system ； The regeneration tower experiences high hydrogen sulfide concentrations and high temperatures, which makes it susceptible to corrosion; therefore, it is essential to control the water content in methanol during operation. If the water content is too high, it can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases present; moreover, the high temperature makes corrosion inevitable. Some processes involve adding alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. Hydrogen sulfide and water present in the transfer pipeline can cause corrosion; therefore, stainless steel is used as the material for this section of the system ； The regeneration tower experiences high hydrogen sulfide concentrations and high temperatures, which makes it susceptible to corrosion; therefore, it is essential to control the water content in methanol during operation. If the water content is too high, it can cause severe corrosion in the regeneration tower. In the methanol-water separation tower, there is water and carbon dioxide-containing acidic gases present; moreover, the high temperature makes corrosion inevitable. Some processes involve adding alkali at this stage to reduce corrosion.
Answer: Corrosion is mainly concentrated 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. 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. 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 levels 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 also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.
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. 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.
The corrosion in the low-temperature methanol wash system is mainly concentrated 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. 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, and the high temperature also makes corrosion inevitable; therefore, some processes add alkali at this stage to reduce corrosion.