Sodium borate pentahydrate

Synonyms/Trade Names Borax pentahydrate, Sodium borate pentahydrate, Sodium tetraborate pentahydrate ... 

Borax Decahydrate and Pentahydrate. Borax decahydrate and pentahydrate are produced from sodium borate ores, dry lake brines, colemanite, or magnesium borate ores. 

The derivatives plant is designed to aimuaHy produce 160,000 t of borax pentahydrate, 17,000 t of borax decahydrate, and 60,000 t of anhydrous borax. A reported 50,000 t of borax pentahydrate was produced in 1987. A sodium borate refinery is fed from stockpiled tincal ore or product from the concentration plant. The feed is dissolved using steam to give a solution 18% in The solution is then passed through a series of filters and sent to a... 

Sodium borate (decahydrate, hydrated borax) [1303-96-4] M 381.2, m 75 (loses 5H2O at 60 ), d 1.73. Crystd from water (3.3mL/g) keeping below 55° to avoid formation of the pentahydrate. Filtered at the pump, washed with water and equilibrated for several days in a desiccator containing an aqueous solution saturated with respect to sucrose and NaCl. Borax can be prepared more quickly (but its water content is somewhat variable) by washing the recrystd material at the pump with water, followed by 95% EtOH, then Et20, and air dried at room temperature for 12-18h on a clock glass. 

Borax pentahydrate is produced from various sodium borate and magnesium borate ores. In the United States, it is produced from dry lake brines, colemanite and tincal. It is commercially produced along with the decahy-drate. The production processes are similar to decahydrate (see Borax dec-ahydrate). 

The metaborates, 1 1 x, are the most common borates of barium. BaO B203 1 H20 precipitates from a boiling solution of barium chloride and boric acid treated with sodium hydroxide to a pH of over 11.4 (260) it dehydrates completely at 300°C. The 1 1 4, 1 1 5, and 1 1 6 metaborates have the formula Ba[B(OH)J2 xH20 (Table I). The tetrahydrate is stable at 30°C in the Ba0-B203-H20 system (202) and can be separated from sodium borate/barium chloride solutions at pH 11 at a higher pH and in dilute solution, the pentahydrate crystallizes out. 

RTM produces borax decahydrate, borax pentahydrate, anhydrous borax, boric acid (BA), boric oxide, and other specialty borates such as zinc borates from sodium borate minerals. Etibank, a Turkish national mining enterprise, offers borate minerals (colemanite and ulexite) as well as refined borates. 

Borax pentahydrate (also known as Neobor ) is the most common form of sodium borate used in a variety of industries. Its advantages when compared with borax lie in the lower transportation, handling, and the storage cost of a more concentrated product. Borax pentahydrate readily effloresces upon heating. It starts to dehydrate at about 65°C, loses all water of hydration when heated above 320°C, and fuses when heated above 740°C. In water, it hydrolyzes to give a mildly alkaline solution with excellent buffering properties.7... 

Due to their low dehydration temperatures and water solubilities, boric acid and sodium borates (borax pentahydrate and borax decahydrate) are mostly used as fire retardants in wood/cellulosic products such as timbers, plywood, particle board, wood fiber, paper products, and cotton products. In recent years, boric acid has also been used as fire retardant in epoxy intumescent coating, pheno-lics, urethane foam, and so on. When necessary, boric acid can be coated with silicone oil such as silicone to alleviate its water solubility in water-based coating. 

Commercially available sodium borate decahydrate is usually present as monoclinic prismatic crystals that become opaque on the surface in dry air. In addition to the decahydrate, a pentahydrate exists this is also known as jeweller s borax. The anhydrous substance is also available and is called pyroborax. The EINECS number for sodium borate is 271-536-2. 

Borates, tetra, sodium salts, pentahydrate. See Sodium tetraborate pentahydrate Borate (1-), tetrafluoro-, hydrogen. See Fluoboric acid... 

Boric acid, disodium salt, pentahydrate. See Sodium tetraborate pentahydrate Boric acid, monoisopropanolamine salt. See MIPA-borate... 

Sodium borate Sodium borate decahydrate Sodium tetraborate pentahydrate Unichem SOBOR 215-542-5 Isodecyl acrylate SR 395 215-548-8 Antiblaze TCP Disflamoll TKP Durad 125 Kronitex TCP Lindol ... 

Sodium borates Borax pentahydrate Na2O.2B2O3.5H2O 49... 

Sodium borate (decahydrate), (borax), (M.Wt. 381.38). Cryst. from water (3.3 ml/g), keeping the temperature below 55°C (to avoid formation of the pentahydrate). Wash with water. Equilibrate for several days in a desiccator containing an aqueous solution saturated with respect to both sucrose and sodium chloride. (Less reliably, because of variable water content in the final product, washing with water can be followed by ethanol and ether, with air-drying at room temperature for 12—18 hours on a clock glass.)... 

For cellulosic systems, endothermic release of water and melting to form a sodium borate or boric oxide coating from borate fire retardants (such as boric acid, borax pentahydrate and disodium octaborate tetrahydrate) are responsible for the fire retardancy. Chemically, borates can also react with the C6-hydroxyl group of cellulose to give a borate ester, blocking the release of flammable C-6 fragments. In addition, dehydration of alcohols is enhanced by boric acid, which accounts for the larger quantities of char produced when borate treated cellulose is burned. 

Sodium/TEA-undecylenoyl animal collagen amino acids. See Sodium/TEA-undecenoyl collagen amino acids Sodium tetraborate anhydrous. See Sodium borate Sodium tetraborate decahydrate. See Sodium borate decahydrate Sodium tetraborate pentahydrate CAS 12179-04-3 EINECS/ELINCS 215-540-4... 

North American Chemical Co. produces borax pentahydrate and decahydrate from Seades Lake brines in both Trona and West End, California (see Chemicals frombrines). The 88 km dry lake consists of two brine layers, the analyses of which are given in Table 11. Two distinct procedures are used for the processing of upper and lower lake brines. Borax is produced in Trona from upper lake brines by an evaporative procedure involving the crystallization of potash and several other salts prior to borax crystallization as the pentahydrate (104). A carbonation process is used in West End, California to derive borate values from lower lake brines (105). Raw lower stmcture brine is carbonated to produce sodium bicarbonate, which is calcined and recrystallized as sodium carbonate monohydrate. The borate-rich filtrate is neutralized with lake brine and refrigerated to crystallize borax. 

In 1986, Turkey produced nearly one million metric tons of mineral concentrate, whereas production of refined borate chemicals was 89,500 metric tons. Annual production capacities of chemicals at Eskiseher were pentahydrate borax, 160,000 t anhydrous borax, 60,000 t and decahydrate borax, 17,000 t. Capacities at Bandermes were decahydrate borax, 55,000 t boric acid, 33,000 t and sodium perborate, 64,000 t (103). 

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