Regarding the water content of refined methanol
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The refined methanol in our factory is qualified when it is extracted, and it is also qualified when it enters the refined methanol metering tank. However, the water content exceeds the standard after it reaches the refined methanol storage tank. Moreover, the refined methanol metering tank has been replaced with qualified refined methanol many times. The refined methanol in the storage tank is still unqualified. I don’t know what is going on. Please help me solve it. Thanks in advance. Other: Our factory uses natural gas as raw material and adopts four-column distillation.
This post was last edited by tczxs on 2010-5-3 10:07 Is the refined methanol tank equipped with spray water cooling? Could the water leak in from somewhere? Also, is there something wrong with the alcohol pipeline? What type of pure pump should I choose? Is it sealed with water cooling? If it is water-cooled, is the cooling water leaking from the mechanical seal?
The pipes used for intermediate transfer should be replaced with non-aqueous nitrogen to ensure that methanol does not come into contact with water-containing air. One process in our factory is to remove water and oxygen.
As long as your intermediate refined methanol tank is qualified, if the large tank fails, let the large tank area find the reason. Check the pump and the intermediate pipeline to see if there is any cross-talk in that area. Looking for the reason for the analysis results. One by one exclusion. The next step is to improve the quality of your refined methanol. Sometimes errors are common. To improve the quality of refined methanol, eliminate the causes one by one. You have to find the reason yourself. You can find it if you are careful.
1# liqinglsl Find the problem between the outlet of the refined methanol metering tank and the refined methanol storage tank. It is estimated that there is a possibility of cross-connection in the middle, or it may be that the water in the refined methanol storage tank has not been treated dry.
We used refined methanol to replace it, but it still failed after a long time of replacement. The water content is not up to standard. The refined methanol pump is a canned pump and has no cooling water. Even if there is water in the pipe, it should be qualified after replacing it for so long. The key is that after replacing it many times, it still fails.
1# liqinglsl to see if there is a problem with analysis or sampling.
Does your big tank have a breathing valve? Since methanol is miscible with water, it will absorb water more or less. Take a look and see if there is any leakage of air in the big tank!
9# 3155128 Our refined methanol storage tank is of internal floating roof type. No breathing valve
Take samples from any place where samples can be taken from the outlet of the methanol pump and check the results to see where there are changes, and then check the process where there are changes.