Polyethylene glycol as an antifoaming agent
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This post was last edited by Qingcheng Jun on 2022-10-28 at 15:55. Studies show that polyethylene glycol, when used as an antifoaming agent, can reduce foam formation in liquids. According to common understanding, polyethylene glycol, as an organic polymer, can be imagined as plastic beads; these beads can break up air bubbles in a liquid, thereby achieving the effect of defoaming. According to the information, polyethylene glycol dissolves in water. What is its state after dissolution? It cannot be considered as small balls dispersed in the water. Once polyethylene glycol is added, how can it be separated from the target material? The target material is one with low waste generation; polyethylene glycol is removed through distillation or rectification. Where can I find data on the saturated vapor pressure of polyethylene glycol? Polyethylene glycol with a molecular weight of 6000
The principle of defoamers is to alter the surface tension of foam, causing it to break apart. Polyethylene glycol with a low degree of polymerization is a water-soluble surfactant. Since the amount used is very small, there is no need to separate it from the product later on. There are many types of defoamers; do they have any effect on the product? This is also one of the selection criteria.
Thank you. The product has extremely strict requirements regarding impurity content; it must be below 0.1 ppm
Then you can choose lower-grade alcohol-based defoamers for easier separation, such as ethanol, which is soluble and volatile.
Are there defoamers that are not easily volatile, for which vapor pressure data is available?