Caustic soda, also called sodium hydroxide, is a strong caustic alkali, generally white translucent sheet solid, soluble in water (heat release when dissolved in water) and forms an alkaline solution. It is deliquescent, easy to absorb water vapor and carbon dioxide in the air. Caustic soda in water treatment can be used as an alkaline cleaner, soluble in ethanol and glycerin, insoluble in propanol, ether. It also corrodes carbon and sodium at high temperatures. And it has a disproportionation reaction with chlorine, bromine, iodine, and other halogens. It forms salt and water when neutralizing with acids. Contact us online to can get a price list now.
|Items||Caustic Soda Flakes||Caustic Soda Pearls|
|Sodium Hydroxide %≥||99||99|
|Sodium Chloride %≤||0.03||0.03|
|Ferroso-ferric Oxide %≤||0.005||0.005|
|Particle size||—–||≤ 0.8 mm 8%max|
|0.8-1.2 mm 90%min|
|≥1.2 mm 2%max|
|Packing||25kgs plastic woven bags double lined with polythene bags. 1200kg jumbo bags.|
|Storage||They should be stored in a dry, ventilative and clean warehouse, kept away from water and moisture, furthermore, they should be stored separately from poisonous.|
Three Common Types of Sodium Hydroxide
Caustic soda flakes is flaky white translucent solid in appearance, which is obtained by evaporating liquid caustic soda. The molten salt method is one of the methods for producing sodium hydroxide flakes. The lye is concentrated from 32% to 61% in the falling film evaporator. The heating source adopts medium pressure steam and secondary steam, and evaporates under vacuum. The 61% lye is then passed through the falling film concentrator, using molten salt as the heat carrier, the lye is concentrated into molten alkali under normal pressure. Then the caustic soda flakes are made by the flake alkali machine. In addition to water treatment fields, sodium hydroxide flakes are widely used in the light textile industry, such as papermaking, synthetic detergent and soap, viscose fiber, rayon and cotton fabric. Also be used in pesticides, dyes, rubber and chemical industries, petroleum drilling, petroleum oil refining and tar refining, as well as defense industry, machinery industry, wood processing, metallurgical industry and urban construction.
Caustic soda pearls, one type of solid caustic soda, is granular in appearance. According to the particle size, it can be divided into coarse-grained and particulate sodium hydroxide. The particle size of the particulate granular is about 0.7mm with the shape similar to washing powder. It has all the chemical properties of sodium hydroxide. When placed in the air, it will absorb moisture and deliquescence, react with carbon dioxide to deteriorate. The packaging requires drying and sealing. Generally, 25kg three-layer plastic woven bags are used to package granular caustic soda.
In most industrial fields, caustic soda pearls have better performance than caustic soda flakes and other solid sodium hydroxide. So it is widely welcomed by industrial manufacturing. At the same time, the production process of sodium hydroxide pearls is more difficult and complicated. Of course, the price is generally higher than that of the flake type.
Caustic soda lye is pure liquid caustic soda, which is colorless and transparent. Industrial grade mostly contain impurities, mainly sodium chloride and sodium carbonate, and sometimes a small amount of iron oxide. When dissolved into concentrated liquid caustic soda, most of the impurities will float to surface and can be separated and removed. In the chemical industry, it is used to manufacture formic acid, oxalic acid, borax, phenol, sodium cyanide, as well as soap, synthetic fatty acid and synthetic detergent. In textile printing and dyeing industry, it is used as a solvent for cotton cloth desizing agent scouring agent, mercerizing agent and vat dye. In the smelting industry, it can be used to manufacture aluminum hydroxide, aluminum oxide and metal surface treatment agents. In instrument industry, it is used as an acid neutralizer, decolorizer and deodorizing agent. In adhesive industry, it is used as starch gelatinizer and neutralizer. In addition, it is widely used in enamel, medicine, cosmetics, tanning, paint, pesticide, glass and other industries. We can supply the purity of 32%/50% caustic soda liquid with the package of 20L/25L/30L/220L drum and 1000L IBC drum.
What is Caustic Soda 99% Used for
Sodium hydroxide uses in making soap, printing and dyeing, textile, papermaking, refined petroleum, metallurgy, and other chemical industries because of its strong alkalinity. In addition, the production of dyes, plastics, and preparation of borax, manganate, phosphate, etc. also requires the use of a large amount of caustic soda.
Caustic soda is widely used as water treatment chemical. In wastewater treatment plants, sodium hydroxide can reduce the hardness of water through a neutralization reaction. In the industrial field, it is a regeneration agent for the regeneration of ion exchange resins. Sodium hydroxide is strongly alkaline and has relatively high solubility in water. Because sodium hydroxide has relatively high solubility in water, it is easy to measure the amount and can be conveniently used in various fields of water treatment.
Sodium hydroxide has been used for traditional domestic purposes. To this day, the rare demand for soap, soap boxes and other kinds of washing products still accounts for about 15% of caustic soda. Making soap is the oldest and most widespread use of sodium hydroxide. Ordinary soap is the sodium salt of higher fatty acids, which is generally made by saponification of oil under the action of slightly excessive caustic soda. In the making of soap, caustic soda is used to neutralize fatty acids.
It is mainly used for indigo dyes, quinone dyes. In the process of vat dyeing, it should be used first to reduce it to cryptochromes acid. After dyeing, oxidant should be used to oxidize it to the original insoluble state. Cotton fabric treated with caustic soda liquid can remove the wax, grease, starch and other substances covered in cotton fabric, and at the same time can increase the luster of the fabric, so that the dyeing is more uniform.
In the textile industry, cotton and linen fabrics are treated with caustic soda solutions to improve fiber properties. Artificial fiber such as rayon, wool, rayon, mostly viscose fiber, they are cellulose (such as pulp), caustic soda, carbon disulfide as raw materials, made viscose liquid, the spinneret, condensation and made.
The raw materials of papermaking are wood or grass plants. In addition to cellulose, these plants also contain a considerable amount of non-cellulose (such as lignin, gum, etc.). Caustic soda pearls/flakes are used to remove lignin. Only by removing lignin from wood can fiber be obtained. Adding it can dissolve and separate the non-cellulose components, thus making pulp with cellulose as the main component.
This chemical is also used for refined petroleum. In order to remove the colloid in petroleum fractions, concentrated sulfuric acid is usually added to the petroleum fractions to make the colloid become acid residue and precipitate out. After pickling, the oil also contains phenol, naphthenic acid, and other acidic magazines and excess sulfuric acid, must be washed with sodium hydroxide solution, and then washed by water, in order to get refined petroleum products.
In the metallurgical industry, it is often necessary to convert the active components of ore into soluble sodium salts in order to remove the insoluble impurities therein. The chemical is therefore often required. For example, it is used in the preparation of cryolite and the treatment of bauxite in the smelting of aluminum. And when smelting tungsten, it is also the first concentrate and caustic soda roasting into soluble sodium tungstate, and then through the process of acid evolution, dehydration, reduction and so on to make powdered tungsten.
sodium hydroxide can be used for various cleaning agents. Such as car washing agent, bottle washing agent, detergent, rust remover, disinfectant configuration. Mainly used for cleaning wine bottles, ceramic metal industry surface treatment and so on. There are two main functions of sodium hydroxide in ceramic manufacturing: First, it is used as a diluent in the ceramic firing process. Second, the ceramic surface will be scratched or rough after firing. After washing with a its solution, the ceramic surface will be smoother.