defoamer-antifoam

Is silicone oil safe? From a physiological point of view, polysiloxane is one of the polymers with the lowest known activity. The results of toxicological studies suggest that dimethyl silicone oil, which removes low-boiling substances, is non-toxic and can be used in large amounts in food, cosmetics, and pharmaceuticals. The LD50 value (50% lethal amount) of the lethal dose of dimethyl silicone oil is more than 35g/Kg. This value is classified according to the toxicity of the American Industrial Hygiene Association, which is equivalent to non-toxic; it also has no chronic poisoning problems and will not be absorbed by the digestive system. No irritation to the membrane; low viscosity dimethyl silicone oil has slight irritation to the cornea, but no harm. Safety data of silicone oil as follow: Types of silicone oil Viscosity (25 °C /mm 2 Ÿ s) Skin irritation (human) Chronic toxicity (rat, 6 ...

Defoamers for Distilleries and Sugar Refineries During the production process of the sugar industry, the sugar liquid is mixed with the air under the influence of factors such as stirring, flow and transportation, and it is easy to produce a large amount of foam. The generation of foam often causes the sugar liquid tank to rise and cause material loss. At the same time, more foam also affects the transportation of the sugar liquid, resulting in difficulty in operation. In the evaporation and crystallization section, the thick foam slows down the evaporation and crystallization speed of water, increases energy consumption, and affects the economic benefits of the sugar factory. Therefore, it is very important to eliminate and suppress the formation of sugar liquid foam. The methods for eliminating foam generally include mechanical physical defoaming method and chemical defoaming method. Due to the advantages of time-saving, labor-saving, less investment and quick results, the defoaming...

Antifoam Applications - When To Use or Should You Use Them? Foam is a gas (usually, air) dispersed in a liquid containing some impurity. In secondary treatment systems, bacterial activity is usually the main cause of foam, although mechanical action (cascading flow, pumps, violent agitation, etc.) and chemical contamination also can cause foam. Surfactants in the influent or in some polymer treatments can also cause foaming. Excessive foam, especially in an aeration basin, can cause a variety of problems. A foam blanket on the aeration basin can interfere with oxygen uptake of the microorganisms and hinder BOD reduction. Foam can also cause the biological floc to float producing a sludge which will not settle in the final clarifier. Safety hazards and aesthetic problems occur when wind blows foam across parking lots or highways or neighboring locations. Foam can become an aesthetic problem when a thick blanket of foam floats down a stream from the plant outfall. Antifoams control or e...

Do you know how to control defoamer dosage in the WWTP in order to make defoamer work best? We know that sewage and wastewater need to be treated before it can be discharged daily. But there is a lot of bubbles in the wastewater without treatment, and these bubbles are difficult to eliminate. We must use wastewater treatment and defoamer before we can discharge. . However, how to use the defoamer and how much can be used to just eliminate all the bubbles, many people do not understand the principle, so the defoaming effect is not ideal. Before we understand the defoamer, we must first understand its function and principle! Anyone that can destabilize the foam can be used for defoaming. At present, there are many types of defoamers for wastewater treatment, which are mainly divided into complex system water treatment, high temperature water treatment, sewage treatment, general sewage treatment, and pulp mill water treatment. Use different defoamers depending on the nature of the wa...

D oes Silicone defoamer improve the performance of the slurry or increase the production risk? In the pulping process, in order to obtain white pulp, the chips are subjected to steaming, washing and bleaching processes (Fig. 1), but in this series of fiber processing, a large amount of water is consumed, and a large amount of foam is generated, so the selection is appropriate. Defoamers are critical. Figure 1 Wood chips, post-cooking slurry, slurry after washing, bleached slurry For many years, the paper industry has made many efforts to reduce energy, water and chemical consumption in order to achieve sustainable development. The use of silicone defoamers is one of them. The use efficiency of silicone defoamers can greatly enhance the sustainable development indicators of pulp and paper enterprises. Silicone is a kind of polymer material, in which polysiloxane is composed of silicon-oxygen bond as the skeleton, and the structure is shown in Fig. 2. It represents the infinite p...

In the production of wet-process phosphoric acid, when the content of carbonate and organic matter in the phosphate rock powder is high, a large amount of CO 2 gas is generated by chemical reaction with the acid. With the fierce progress of the acid hydrolysis process, CO 2 is continuously dispersed in the reaction liquid containing organic components, forming a stable foam layer on the surface of the slurry, and its volume can usually reach 5% to 10% of the volume of the reaction liquid. Production brings many adverse effects: first, it affects the dispersion and acid hydrolysis reaction of phosphate ore pulp, which reduces the production capacity; second, the foam layer not only reduces the equipment utilization rate, but also makes it difficult to observe the material level; third, it hinders the reaction process The evaporation of middle water and the removal of heat cause the reaction temperature of the extraction tank t...

How to add defoamer/antifoam and Tips using defoamer Adding Method 1) Gap addition- common method If it is not continuous foaming and the foaming is not severe, the antifoaming agent may be added once or periodically. Since the amount of the antifoaming agent added is small, in order to make the antifoaming agent uniformly dispersed, it should be added in a place where the foaming liquid is drastically shaken. Many occasions can be added by hand. If the blister is violent or for rapid defoaming, it can be sprayed with a spray gun. If foam is allowed to exist within certain limits, just to prevent excessive foaming, an insoluble, high-efficiency silicone paste defoamer may be applied to the upper edge of the wall of the container or applied to a metal mesh or other textile mesh. Above, cover a certain position of the container. The foam layer is exposed to the silicone defoamer and can be broken, thereby blocking the foam from overflowing. Not enough to add once, you can join ...

Nanjing Invelychem has developed a defoamer (anti-foaming agent); Invely-0030, which exhibits a superior defoaming property in the sugarcane ethanol production process. 【 Background of the development 】 Amid the taking measures against global warming, bioethanol is considered a green alternative to gasoline that does not affect the total amount of CO 2 in the atmosphere. It is expected to be carbon-neutral biofuel and its use has been steadily increasing mainly in U.S. and Brazil. Bioethanol is produced from feedstock crops such as sugarcanes and corns via alcoholic fermentation. Especially sugarcanes give very high bioethanol yield per unit of land; thus bioethanol has been already widely used in Brazil where the largest amount of sugarcane is produced worldwide. Bioethanol is produced by a decomposition of sugar to ethanol and carbon dioxide through alcoholic fermentation using yeast. Carbon dioxide generated during the fermentation process creates a lot of foams, and t...