defoamer-antifoam

Application of fumed silica in defoamer The fumed silica is a kind of high-purity, fine, amorphous nanometer silica powder. The specific surface area is 150 ~ 380m2 / g, the primary particle size is between 7 ~ 40 nm, the aggregate particle size is about 200-500nm, the agglomerate particle size is about 5 ~ 20μm, and SiO2 ≥99.5%. Functional additives. In addition to being widely used in silicone rubber, coatings, inks, paints, plastics and other fields, it is also an important component in high-efficiency silicone oil defoamers, which plays a role of dispersion, adsorption, thickening and anti-settling. Vapor-phase process carbon black generally has two types of hydrophilic and hydrophobic products. The hydrophobic products are obtained by surface treatment of hydrophilic products. As an important auxiliary in the industry, the defoamer has a small amount but is indispensable. It is widely used in various fields such as textile, papermaking, petroleum, food, pharmaceutical and so o...

Mini-Encyclopedia of Papermaking Wet-End Chemistry Additives and Ingredients, their Composition, Functions, Strategies for Use ANTI-FOAM / DEFOAMER Composition: There is an extremely diverse set of chemical formulations that can be effective either to prevent foam (anti-foam) or to destroy it once it has formed (defoamer). Actually the distinction between these two terms is usually ignored. Most foam-fighting chemicals can serve either role. Let's therefore use the term "defoamer" as a general label for all of these chemicals. The most universal characteristic of any defoamer is the fact that it is surface active, but highly insoluble in water. It has to be formulated so that it will be dispersed as tiny droplets, i.e. as an emulsion. The surface-active nature of the material causes it to spread very rapidly onto any air-water interface that it encounters. This is especially the case if that interface already is covered by the types of surface-active materials...

A defoamer is an agent added to a liquid to remove surface foam and help release trapped air. These agents are common in many foaming liquids such as cooking oil and laundry soap. They are also common in a wide range of industrial processes ranging from oil refining to wastewater treatment. In most cases, a deformer is placed in a water or oil mixture before being placed into the liquid. These mixtures help to distribute the defoamer evenly through the liquid and often promote a specific type of air removal. Foam is the layer of bubbles that rises to the top of a liquid. Regardless of the liquid, the bubbles operate the same way. Air becomes trapped in the liquid and slowly combines to form a bubble. The bubble will rise to the surface where it will collect in a thick layer of bubbles, or foam. It is possible that the foam would instead sink to the bottom, if the liquid were somehow lighter than air. When air is trapped in certain liquids, it can cause a problem when those liquids...

How to use defoamer in delayed coking? Why should use defoamer for delayed coking?  Delayed coking is a process in which heavy cracked oil is heated to undergo deep cracking and condensation reactions and converted into gas, gasoline, diesel, wax oil and coke. During the reaction process, the coke tower can be divided into three main areas along its height: u   The lower part is a coke layer; u   The middle part is a high-viscosity colloidal asphaltene called a foam layer; u   The upper part is a hydrocarbon layer. The foam layer will maintain a certain height under a certain temperature and pressure. The main factors affecting the height of the foam layer are: the amount of processing, the nature of the raw materials, the exit temperature of the heating furnace and the circulation ratio. Trying to reduce the height of the foam layer is an important measure to increase the throughput. ...

Silicone is so widely used! Let's learn silicone oil production technology Silicone oil is a kind of linear small molecule silicone polymer with Si-O-Si as the main chain and organic groups in the side chain. It is widely used in textile, daily chemical, mechanical processing, chemical, electrical and electronic, medical and health, etc. industry. Silicon oil is usually kept in a liquid state at room temperature. As the molecular weight increases, the viscosity also increases, so viscosity is an important physical property index of silicone oil. 2017 China's silicone oil consumption situation Classification of silicone oil Silicone oil is generally divided into two categories: general silicone oil and modified silicone oil. There is also a class of co-modified silicone oils and derivatives - ternary modified silicone oil Silicone oil properties Silicone oil is generally a colorless, odorless, non-toxic, non-volatile liquid with the following characteristics...

Why silicone exports have shrunk sharply, and silicone prices have fallen off the cliff in China??? In early May of this year, Trump announced on Twitter that "the import tariff will be imposed on Chinese goods by 25%." After that, the US government officially issued an announcement that it is scheduled to impose a 25% tariff on China's 200 billion goods on June 1. It is ridiculous that on May 31, the US government will "take consideration of customs enforcement factors" to levy the taxation date. It was postponed for half a month. This trade war has indeed had a relatively large impact on China's import and export of US goods. But in terms of organic silicon, this year's Sino-US trade war is less affected than last year. Today, based on the export data of silicones from January 2018 to April 2019 and the prices of various silicone products, the impact of trade warfare on silicone prices is analyzed through export conditions, and the reasons for the re...

2018 Silicone Oil Price Trend Silicone prices skyrocket At the beginning of 2018, silicones continued to upgrade with an unstoppable rise. In the second quarter, they rose to the highest price in the past eight years. The whole industry is in full swing and the scenery is infinite. Individual enterprises, silicone oil, 107 rubber, raw Glues, rubber compounds,and cracking materials companies are all full of pots. There are several factors in the skyrocketing factors: First： There is no new capacity in the installation, everyone is happy to watch the 2018 market all the year; Second： The overseas demand is strong, the export market continues to be good; Third： The high market, prompting all the upstream and downstream personnel to enter the bargains Mode, hope to share a piece of this good market. The phenomenon of foaming has gradually become prominent in the rapid rise in prices. Silicone prices plummeted After July 2018, the domestic silicone market began to show a ration...

Defoamer for industrial circulating water Industrial circulating water defoamer is a defoamer developed according to the characteristics of industrial circulating water foaming in the cooling water system. Industrial circulating water is also called cooling circulating water, and is mainly composed of a circulating pump, a control system, a check valve, and the like. However, when water treatment is carried out using industrial cycle machine technology, foam is easily generated due to agitation, entry of soluble gas, equipment, water quality, additives, and the like. If these foams are discharged without treatment, the impact on the ecological environment will be very large. Therefore, it is necessary to use industrial circulating water defoamer at this time. Industrial circulating water process      The industrial circulating water defoaming agent is a defoaming agent which is prepared by compounding a modified silicon polyether with a modified siloxane and us...

What is pesticide additives and why should use defoamer for pesticide production? Pesticide additives are auxiliary substances added to the processing or use of pesticide preparations and used to improve the physical and chemical properties of pharmaceuticals, also known as pesticide adjuvants. The auxiliaries themselves are essentially free of biological activity, but can affect the control effect. With the wide use and development of pesticide additives, its variety is also increasing, so the choice of such additives has become the second biggest choice for farmers to choose pesticides. 1. Auxiliary agent to help disperse the original drug Filler and carrier A solid inert mineral, plant or synthetic material added to a solid pesticide formulation for the purpose of adjusting the finished product content or improving the physical state. The filler is used to dilute the original drug to increase the dispersibility of the original drug, and the carrier also has the function of a...

Why is there bubble in sewage treatment? What are the hazards of these bubbles? How to eliminate these bubbles? In the process of sewage treatment, I believe that everyone often encounters a large amount of foam in the biochemical pool, and if it is at rest, it will overflow from the pool, causing serious pollution of the external pool wall of the external equipment, which will deteriorate the operating conditions. Affected  the surrounding environment Type of foam in sewage treatment 1.    Initial bubble In the initial stage of aeration tank start, the sludge in the aeration tank is not suitable for the water quality of the sewage, and is not suitable for the growth environment, and foam is easily formed. As the sludge adapts to water quality, the foam will decrease. At the beginning of the aeration tank start-up, the sludge is relatively small, the sludge load is high, and foam is easily generated. After the amount of sludge increases, the foam will gradua...

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...

Influencing factors of slurry bubbling overflow in desulfurization absorption tower of 1000 MW unit Introduction Limestone-gypsum wet desulfurization is the most mature and common flue gas desulfurization method at present, and is widely used in 1000MW coal-fired units. With the continuous improvement of China's atmospheric emission standards, the implementation of the "Ultra-low emission reduction plan for coal-fired power plants" and the increasingly serious environmental problems, the safe and stable operation of the flue gas desulfurization system is particularly important, so the refined and professional management of the desulfurization system is also Future Trends. However, the problem of foaming and overflow of the desulfurization absorption tower slurry has become a thorny problem for its safe operation. The foaming of the slurry often causes false liquid level, overflow of the absorption tower, pollution of the environment, increase of energy consumption, ...