defoamer-antifoam

Why does foam generate in biochemical water treatment process? Chemical foam (starting foam) It is formed by the agitating and blowing off the surface active substances in the wastewater. In the initial stage of activated sludge cultivation, there are many chemical foams, and sometimes foam hills up to several meters are formed on the surface of the aeration tank. This is mainly because the initial activated sludge has not yet formed, and all the foam-generating substances form foam under the action of aeration. With the increase of activated sludge, a large amount of surface active substances are absorbed and decomposed by microorganisms, and the foam will gradually disappear. Chemical foam is milky white, easy to handle, can be filled with water to defoam, or defoamer has been added. Denitrifying foam If the nitrification reaction is carried out in the sewage plant, denitrification will occur in the sedimentation tank or in ...

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...

How do we assess antifoam efficiency ? Quality of an antifoam is given by two main characteristics : • Knockdown ability or shock effect :Meaning the speed to destroy an existing foam. • Persistence or durability : Meaning the efficiency over time.   These two parameters can be assessed by several tests. The main test is the bubbling method. A graduated column with a glass frit in the bottom is required. Foaming water is poured in the column and air at constant flowrate is introduced through the glass frit in the column. Foam is generated by the air and starts to travel up the column. At a determined level of foam, antifoam is injected. By this method several antifoaming agents can be tested. A graph reporting foam height vs time is very helpful to establish the knockdown ability and the persistence for each product. The selected antifoam is the product with the best compromise between shock effect and durability       Environmental performance   Silicone antifo...

Why Foam could be so inconvenient ? A light foam is generally not problematic in most applications however heavy foaming can often lead to various processing problems. These problems range from inaccurate readings from control and measuring equipment such as temperature, level and density controllers to poor mixing of reactants in chemical reaction vessels and products hanging in the foam, all too often leading to losses in production. Finally the presence of foaming can give a bad image of the way a process is operated in the eyes of a customer. The presence of foam in discharged effluent can cause complaints from local people and authorities even if the foam is harmless to people and the environment. How do silicone defoamers work ? Foam is a gas dispersion in a liquid or solid continuous phase. Foam iscreated by the surfactants which are at the air/liquid interface. Therefore air bubbles occur and are stabilised by the surfactants. Today, silicone antifoams are thebest solution to a...

Do you know how to choose defoamers for Coal washing industry? The transformation and upgrading of the coal industry is the only way ... To promote industrial restructuring and transformation and upgrading, the core is coal washing. The main role of the coal washing process is to reduce coal transportation costs and increase coal utilization. However, there is usually a problem with coal washing, that is, the foam problem. These foams are mainly caused by impurities, surfactants, agitation, etc. mixed in raw coal mining. What is coal washing Through the impact of water flow, the raw coal with different composition and different specific gravity is separated into different grades, and the dust and waste stone are removed to reduce the ash and sulfur content, which is called coal washing. Coal washing is an indispensable link in coal processing. The coal after coal washing is called clean coal. In addition to the purpose of environmental protection, coal washing can also increase the uti...

Elkem acquires Guangzhou Polysil Elkem Corporation, an overseas company affiliated to China Bluestar, announced on April 14, 2020 that it has completed the acquisition of Guangdong Polysilicon Technology Co., Ltd. (Polysil, referred to as Poly Science and Technology). This successful acquisition will help the two companies to play a role in silicone product technology. The synergy with the terminal market has laid a solid foundation for the professional development of Elkem in China and even the world. About Polysil Polysil  is a leading manufacturer of silicone elastomers and resin materials in China. Headquartered in Zhongshan City, Guangdong Province, it has two factories and a research and development center with more than 350 employees. The company has a leading technological position in the production and development of thermosetting silicone rubber (HCR), liquid silicone rubber (LSR) and special silicone resins and pressure-sensitive adhesives (PSA). Representative products ...

Invely-3180 defoamer for paper pulp（black liquor） It is well known that pulping is the process of separating fiber materials from plants to obtain pulp. In the pulping process, a large amount of foam will be produced, affecting the production efficiency and the quality of the pulp board. The role of defoamers in the pulp industry is very critical. It is used to prevent various problems caused by foam during the pulp washing process, such as slurry overflow tank, reducing the efficiency of the pump, the formation of deposits on the paper, pulp water filtration Problems, etc. Invely defoamer 3180 uses innovative silicone chemistry to achieve superior foam suppression. It can be used in black liquor without depositing on paper, improving water filtration performance and effectively helping pul p mills Improve efficiency. Invely-3180 improves production efficiency while reducing total operating costs. Invely-3180 is specially designed for pulp and is also recommended for industrial cleanin...

INVELYCHEM is focus on defoamers in China with full range of industries over 10 years, as ANTIFOAMS producer,Invelychem offers a great alternative choice to customer globally.  In 2019, we expand our capacity up to 18,000tons/year because of the rapid growth of our  business. Silicone based defoamers : 8000Tons/Year Fatty Alcohol based defoamers: 6000Tons/Year Mineral Oil based defoamers: 1000Tons/Year Polyether based defoamers: 3000Tons/Year. Our philosophy is refreshingly simple. To produce the best products in the market and support this with an outstanding technical sales and customer support team.  Chinese Leaders in Foam Control Solutions—Serving global market with our profession for more info:  https://www.ywlchemical.com/

How to choose the appropriate defoamer for low viscosity acrylic adhesive What is defoamers? Antifoaming agents are substances with lower surface tension and higher surface activity, which can inhibit and eliminate foam in liquids, which means that antifoaming agents can reduce the surface tension of water, solutions, suspensions, etc. Some bubbles are eliminated. The long-term defoaming is also called anti-foaming. The length of the anti-foaming time is the main symbol of the quality of the antifoaming agent. In most cases, the use of anti-foaming agent is to use his anti-foaming properties, rather than the initial anti-foaming properties. Defoaming and foam suppression are relative. Products with good defoaming performance will have relatively poor foam suppressing performance. In actual application, it depends on the specific situation. Therefore, from the perspective of defoaming effects, defoamers include defoamers, defoamers, and defoamers, which are collectively called defoamers...

Do you know the major applications of silicone defoamers? 1. Textile printing and dyeing: Sizing process: water emulsion type silicone defoamer, such as: silicone polyether, the amount added in the sizing tank is 0.2¬0.25g / L Chemical fiber oil agent: chemical fiber oil agent is added with 0.02¬0.04% water emulsion defoamer. The chemical fiber oil formulation should contain silicone oil. Desizing and refining: use polyether-containing silicone. Bleaching: Strong acidity, silicone defoamer. Dyeing: Silicone emulsion defoamer. It is best to use polyether silicone for jet dyeing, which is high-temperature defoaming, low-temperature water-soluble, and does not stain the fabric. 2. Petrochemical industry: Drilling: ethyl silicone oil (or methyl silicone oil layer emulsion) is used for mud additives. Oil recovery: oil and gas separation, defoaming stick. The melting point is 2.8 13.9 ° C higher than the foam temperature at the wellhead. Absorption of natural gasoline: Dimethyl silicone oil ...

1. Turbidity of defoamer: The defoamer is not compatible with the system used, the second is suspended in it. Then the performance of the defoamer will vary greatly due to the different dosage and color of different materials. But as long as the final defoaming effect is good, the foam suppression time is long. 2. Antifoaming time of antifoaming agent: defoamers The nature and content of the silicone oil in the defoamer can determine the length of time the defoamer suppresses the foam in the system and the duration of use. The particle size of the antifoaming agent determines the filtration resistance of the antifoaming agent. During the use, the sewage needs to be filtered multiple times. Both the anti-foam effect and the anti-foam effect will have a certain impact. 3. The defoamer fails: There are many types of defoamers on the market, and different defoamers have different properties. Some defoamers have poor acid and alkali resistance, which can cause the silicone oil to decompose,...