Production and Applications of Naphthalene Sulfonate Water Reducing Agent
Russia and Ukraine is an important exporters of oil, natural gas, metals, fertilizers, rare gases and other industrial raw materials. Affected by the further intensification of the tension of the war, the global market has become more worried about the supply of the Water Reducing Agent, and panic spreads in the futures market. Prices of commodities such as aluminum and nickel are at recent highs on concerns that supplies will fall. Russia accounts for 49 percent of global exports of nickel, 42 percent of palladium, 26 percent of aluminum and 13 percent of platinum, and is a significant exporter of steel and copper. Palladium is an important metal for sensors and memory. In addition, Russia is the world's largest exporter of nitrogen fertilizer, the second largest exporter of potash fertilizer, and the third-largest exporter of phosphate fertilizer. Ukraine is also an important producer of nitrogen fertilizer. Russia's natural gas supply also has a significant impact on the global fertilizer industry and Water Reducing Agent industry, especially in Europe. The price of the Water Reducing Agent will also fluctuate to some extent. Russia carries out crude gas separation, and Ukraine is responsible for refined exports. Ukraine supplies 70% of the world's neon, 40% of krypton and 30% of xenon. These three gases are the materials used to make chips.
Introduction to Naphthalene Sulfonate Water Reducing Agent:
It is the product of naphthalene sulfonated by sulfuric acid and then condensed with formaldehyde, which belongs to an anionic surfactant. The appearance of this kind of water-reducing agent depending on different products is light yellow to dark brown powder. It is soluble in water and has a good dispersing effect on many powder materials such as cement. The water reduction rate is 25%.
Preparation method of Naphthalene Sulfonate Water Reducing Agent:
The synthetic route of naphthalene sulfonate superplasticizer is as follows:
naphthalene → sulfonation → hydrolysis → condensation → neutralization → filtration → drying → product
The raw material for production is naphthalene. First, the sulfonation reaction is carried out with concentrated sulfuric acid. The mole ratio of naphthalene to sulfuric acid is 1:1.3-1.4. The reaction temperature was 160 - 165℃ and the reaction time was 3h. Then the reactants were cooled to 120℃ for hydrolysis. At this time, naphthalene sulfonic acid was stable, while naphthalene sulfonic acid was easy to hydrolyze, thus reducing the amount of naphthalene sulfonic acid to facilitate the next polycondensation reaction. The hydrolysis time was about 30min. The condensation reaction is an important reaction in the production of a naphthalene sulfonate water reducer. At a certain temperature, the sulfonated naphthalene was condensed with formaldehyde to form a polymer compound. This reaction strongly affects the performance of the product. In order to find the optimal process parameters, the effects of condensation time, condensation temperature, and the ratio of formaldehyde and naphthalene on product properties were investigated by means of uniform design. The optimal temperature condition is 104℃. The optimal reaction time was 6h. The optimal condition of formaldehyde dosage is 0.75. The maximum expected theoretical value is 18.3.
Industrial production process of Naphthalene Sulfonate Water Reducing Agent:
(1) naphthalene: Naphthalene is solid at room temperature, and it is necessary to put naphthalene into the naphthalene kettle for heating and melting.
(2) sulfonation: The sulfonation process is to add concentrated sulfuric acid to the sulfonation kettle and react with it to produce naphthalene sulfonic acid. There are two types of naphthalene sulfonic acid: α -naphthalene sulfonic acid and β -naphthalene sulfonic acid.
(3) hydrolysis: As α -naphthalene sulfonic acid is produced in the sulfonation reaction, its presence is not conducive to the condensation reaction, so it needs to add water to hydrolyze α -naphthalene sulfonic acid.
(4) condensation: After the end of hydrolysis reaction to condensation kettle drop formaldehyde, and β -naphthalene sulfonic acid reaction to generate naphthalene sulfonated formaldehyde condensation.
(5) neutralization: After condensation, the material enters the neutralization kettle, drops liquid alkali, neutralizes the excess sulfuric acid in the sulfonation reaction, and stops dropping when the PH reaches 7-9.
The control system mainly monitors the production status of four different reaction reactors and their batching tanks. The production line can also carry out four production lines at the same time. Taking production line A as an example, there are one naphthalene reactor, two sulfonation reactors, four condensation reactors, and one neutralization reactor. Each reaction kettle has a feed valve, discharge valve, emptying valve, hot oil valve, cooling water valve, steam pressure valve, flush valve, etc., the reaction kettle with a raw material tank, two sulfonated kettles shared a sulfuric acid tank, every two condensation kettles would be equipped with a set of formaldehyde tank and dilution tank, each condensation kettle has a hydrolysis tank, liquid alkali tank to neutralize the alkali added drops in the kettle.
Applications of Naphthalene Sulfonate Water Reducing Agent:
Naphthalene water-reducing agent is a kind of concrete additive invented by Dr. Hwab Kenichi in Japan in 1962. It is a kind of chemical synthetic product of naphthalene sulfonate formaldehyde condensation, with industrial naphthalene, concentrated sulfuric acid, formaldehyde, and alkali as the main raw material. Adding a naphthalene water-reducing agent to concrete can not only improve the strength of concrete but also improve its various properties, such as wear resistance, corrosion resistance, permeability resistance, etc. Therefore, naphthalene water-reducing agent is widely used in roads, bridges, tunnels, docks, civil buildings, and other industries.
Suppliers of Concrete Additives
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China's non-manufacturing purchasing managers index for March was released by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent.
China's non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector from the previous month. In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.
Then the Water Reducing Agent of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the Water Reducing Agent, welcome to contact us.