Defoamers (Defoaming agents) are widely used and of various kinds; the application of water treatment defoamers accounts for more than 60% of the defoamer market share, so how to choose the right products among many water treatment defoamers? How to master the standard of adding amount of defoamer in water treatment? The selection of bad defoamer is not only a waste of time and money, but also can not solve the bubble problem. It will even affect the benign operation of the water treatment system itself.
How to choose defoamer for water treatment
1. water treatment defoamer should be insoluble or difficult to dissolve in foam solution to destroy foam. Water treatment defoamer should be concentrated and concentrated on the bubble film, and the situation of foam suppression should always be maintained in such a state. In order to achieve the best effect, the molecule of its active component must be strong hydrophobic and weak hydrophilic, and the HLB value should be controlled in the range of 1.5-3. Therefore, the defoamer is supersaturated in the foaming solution. Only when it is insoluble or insoluble can it easily reach supersaturation. Insoluble or insoluble, it is easy to gather at the gas-liquid interface, it is easy to concentrate on the bubble membrane, and it can play a role at a lower concentration.
2. The surface tension of defoamer is lower than that of foaming solution. Only when the surface tension of water treatment defoamer is lower than that of foaming solution, the defoamer particles can be immersed and expanded on the bubble membrane. It should be noted that the surface tension of foaming solution is not the surface tension of solution, but the surface tension of foaming solution.
3. the defoaming agent for water treatment requires a certain degree of affinity with the foaming liquid, because in the process of defoaming is actually the competition between the rate of collapse of the foam and the rate of foam formation, so the defoaming agent for water treatment must be able to disperse quickly in the foaming liquid so as to be able to play a role in the larger range of foaming liquid quickly. Therefore, in order to make the defoamer diffuse quickly, the active components of defoamer must have a certain degree of affinity with the foaming solution. The active components of defoamer are too close to the foaming solution, which will dissolve; too sparse and difficult to disperse. Only when intimacy is appropriate, the effect will be good. This is also the technical point of water treatment foaming agent
4. There must be no chemical reaction between defoamer and foaming solution. If defoamer reacts with foaming solution, on the one hand, defoamer will lose defoaming effect, on the other hand, it may produce harmful substances, which will affect the growth of microorganisms and the operation of water treatment system.
5. The volatility of defoamer in water treatment must be small and the time of foam suppression must be long.
Standard addition amount of defoamer for water treatment
1. Defoamer for alcohol water treatment: the amount of alcohol defoamer is generally in the range of 0.01-0.10%.
2. Defoamer for oil water treatment: the amount of oil defoamer is 0.05-2%, and the amount of fatty acid ester defoamer is 0.002-0.2%.
3. Amide defoamer for water treatment: the effect of amide defoamer is better, and the addition amount is generally within 0.002-0.005%.
4. Defoamer for phosphoric acid water treatment: phosphoric acid defoamer is most commonly used in fiber and lubricating oil, with the addition of 0.025-0.25%.
5. Amine water treatment defoamer: amine defoamer is mainly used in fiber processing, with the addition amount of 0.02-2%.
6. Defoamer for ether water treatment: the amount of defoamer is 0.025-0.25%.
We also need to determine our own foaming system, which is water-based system or oil-based system. The most suitable and economical defoamer product can be obtained by choosing the proper defoamer for water treatment, comparing the amount of defoamer added and referring to the price. The amount of defoamer should also be considered. There are many kinds of defoamers, and different types of defoamers need different amounts of additives
Shaanxi United Xingchuang International Co., Ltd. Specializes in water treatment chemicals & food additives, such as Polyacrylamide, poly aluminium chloride, poly ferric sulfate, defoaming agents,, dextrose in food, citric acid food additive and so on.
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