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I urgently need expert advice. I am working on a product, and for the removal of water from organic solvents (with a density of less than 0.9 and insoluble in water), I am considering one of the following methods: 1. Using table salt for dehydration, relying on the difference in specific gravity to separate the components. 2. Form hydrochloric acid using hydrogen chloride, and separate the layers to remove it. Which of these two methods has a better removal efficiency? To what extent can each of these two methods remove water? Thank you!
If possible, please clarify the problem so that I can help you analyze and make a judgment.
To what extent water can be separated depends on whether the water in your system will emulsify To what extent are water and oil mutually soluble? What is the viscosity of the oil phase? Everything is different.
If the water content is low, use a molecular sieve for dehydration. If there is too much water, and since it’s insoluble, it’s similar to oil-water separation in extraction.
Neither method is good; another approach is needed.
I’m not good at chemistry; in layman’s terms: if the amount is small and the freezing points differ, I would consider freezing it first before pouring it out. Run a small experiment?
It is xylene, containing about 300 ppm of water, with a flow rate of 1200 L/h; it is desired to have as low water content as possible.
There are two approaches. The first is online separation: without adding any substances, taking advantage of the fact that its specific gravity is lower than that of water, the majority of the aqueous phase is removed through layer overflow and sedimentation methods, followed by precise dehydration using a fixed drying bed. Second: mechanical extractors, which allow for proper adjustment of the feed rate; they offer good separation efficiency, followed by precise dehydration in a fixed drying bed.
Upstairs, thanks first. However, xylene with about 300 ppm of water content does not separate into layers:). Could you please explain what exactly you mean by a fixed-bed precision dehydration process? Can you give more details? It is hoped to reduce it to around 50 ppm, and it should be suitable for large industrial installations. Thank you!
Reply to 9# fmch6605: 300 ppm is already quite low; typically, the level at the time of manufacturing is below 50 ppm. At 30 ppm, molecular sieves are necessary. If acid resistance is not a concern, some phosphorus pentoxide can be added.