Is the copper sheet corrosion failure?
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What are the possible reasons for unsatisfactory corrosion of copper sheets in gasoline?
Reasons for copper sheet corrosion in catalytic gasoline http://bbs.hcbbs.com/viewthread.php?tid=3835 Analysis of reasons for copper sheet corrosion in gasoline and liquefied gas and solutions http://bbs.hcbbs.com/viewthread.php?tid=354144
Copper sheet corrosion caused by gasoline is due to the presence of hydrogen sulfide in gasoline. If the concentration of the alkaline solution is too high, it can also lead to corrosion of the copper sheets; therefore, it is necessary to determine first whether the corrosion is caused by alkalis or acids. In the case of alkali-induced corrosion, the issue of excessive alkaline concentration must be addressed, usually by keeping it below 15%. If the corrosion is caused by acids, then the alkaline solution needs to be replaced to resolve the problem.
Failure to meet the copper corrosion requirements is definitely related to sulfur content and thiol sulfur content; the specific methods involve alkaline washing for purification or hydrogenation purification
Certain active sulfides in oils can cause corrosion of copper sheets, but different sulfides cause varying degrees of corrosion.
It is mainly caused by active sulfur in gasoline; the composition of active sulfur varies depending on the properties of the raw materials used. If your operations are proper, you may consider using copper sheets as corrosion inhibitors.
The method for testing gasoline corrosion involves immersing a copper sheet in gasoline for a certain period of time to see if it changes color. The degree of color change indicates the level of corrosion. There are two types of defects: sulfur corrosion and alkali corrosion; sampling and analysis are required to determine exactly which type of corrosion is present, so that appropriate measures can be taken to address it
3# Scholar WW, your alkali solution has such a high concentration – that’s a waste of alkali. The concentration of alkali used in our liquefied gas cleaning process is only 2-3%