How to control wastewater when vinyl chloride monomer coexists with water
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How to control wastewater when vinyl chloride monomer coexists with water? Thank you
Make a decanter for water to settle and separate into layers. Observe through the sight glass during discharge. The monomer vaporizes in large amounts as it passes through the sight glass, resulting in numerous bubbles. When this occurs, it indicates that the water has been drained; close the valve immediately.
As mentioned above, a large amount of water is involved; be sure to drain it regularly, such as from the cooler behind the machine and the separator. A small amount of water can help strengthen the alkali dryer. I’m a beginner; if there are any mistakes, please point them out. I will definitely give higher scores. This post was last edited by wf35516481 on 2009-3-6 15:18.]
The drainage of regular operators is monitored through a sight glass, and the pipeline from which the monomer emerges becomes cold due to the heat absorption associated with the vaporization of the monomer. An experienced technician can tell whether the water has been completely drained just by feeling the pipes!
Thank you all for your guidance. To minimize the vaporization of VCM liquid and reduce the control requirements related to energy recovery in later stages, I plan to use additional instrumentation to allow the DCS to take control automatically. This will help reduce the energy consumption associated with compression and condensation, and make the operation smoother. Due to the use of the density difference between water and VCM, control equipment is not necessarily obvious; currently, the operation window becomes fouled and blurry, and operators rely on the temperature difference in the pipelines for judgment. The amount of energy wasted each year as a result is truly substantial, which is a pity. Everyone should strive to improve this structural process. Thank you. This post was last edited by limingshuguang on 2009-3-7 16:40.]
Monomer dehydration is generally achieved through gravity; the monomer settles under the action of gravity in a buffer tank, with a liquid collection container at the bottom for regular drainage. There is a baffle inside the buffer tank; on one side of this baffle (the monomer inlet side), water is separated from the monomer. The monomer that overflows past the baffle can be considered as water-free monomer for subsequent use. When draining, if monomers are discharged, they will vaporize in large quantities; the drainage is complete when the drain pipe suddenly cools down.
First, physical separation using the principle of gravity – a water separator for the largest portion, followed by another water separator for the remaining portion, and a solid-alkali dryer for precise control
There is a type of filter membrane that is selective regarding various water-based monomers; one can be installed on the monomer storage tanks, and it works quite well. Our factory plans to install one as well.