Tribasic lead sulfate oxidation

This lead compound forms prismatic crystals with a length of 1—4 pm and 0.2—08 pm in cross section. Its density is 6.5 g cm. It is poorly soluble in water, 0.0262 g L. 3BS is obtained when leady oxide is mixed with sulfuric acid solution (up to 8 wt % H2S04/Pb0) and constitutes the basic component of the battery paste when the latter is prepared at temperatures below 70 °C. Tribasic lead sulfate exerts an influence on the structure of the lead dioxide active mass and thus on some of the performance characteristics of the battery. 

Lead stabilizers have a strong tendency to adsorb small molecules. On occasion, oxidized products fiom additives used in resin manufacture may react with tribasic lead sulfate or dibasic lead phthalate to the detriment of color hold. This tends to vary with lot to lot and with grade of resin. It can be overcome by use of calcium or barium stearate-coated stabilizer or, in severe cases, by replacing 5—10 percent of sulfate or phthalate with dibasic lead phosphite. 

Commercial blends of Cis-Cig aliphatic alcohols are referred to as cetyl alcohol if C16 predominates or stearyl alcohol if mainly Cig. Both have good color and heat stability, but are relatively expensive. The major use is at levels of 0.2-0.5 parts per 100 of resin (phr) in conjunction with dibasic lead phosphite and tribasic lead sulfate stabUizers. The complexes formed aid mobility of these stabilzers without disturbing fusion time. A similar effect is foimd with metal oxide fillers and with the... 

Tetrabasic Lead Sulfate. Tetrabasic lead sulfate [12065-90-6] 4PbO PbSO, mol wt 1196.12, sp gr 8.15, is made by fusion of stoichiometric quantities of Htharge (PbO) and lead sulfate (PbSO heat of formation, Ai/ = — 1814 kJ/mol (—434.1 kcal/mol). Alternatively, tetrabasic lead sulfate may be prepared by boiling the components in aqueous suspensions. At about 70°C, tribasic hydrate reacts with lead oxide to form tetrabasic sulfate. At 80°C, this transformation is complete in - 20 hours. Tetrabasic lead sulfate is used in limited quantities in Europe as a PVC stabilizer. However, in the United States, lead-acid batteries have been developed by BeU Telephone Laboratories, which contain tetrabasic lead sulfate. Such batteries are used for emergency power at telephone switchboard stations and have an anticipated service life of over 50 years. 

Paste Mixing. The active materials for both positive and negative plates are made from the identical base materials. Lead oxide, fibers, water, and a dilute solution of sulfuric acid are combined in an agitated batch mixer or reactor to form a pastelike mixture of lead sulfates, the normal, tribasic, and tetrabasic sulfates, plus PbO, water, and free lead. The positive and negative pastes differ only in additives to the base mixture. Organic expanders, barium sulfate [7727-43-7] BaSO carbon, and occasionally mineral oil are added to the negative paste. Red lead [1314-41 -6] or minium, Pb O, is sometimes added to the positive mix. The paste for both electrodes is characterized by cube weight or density, penetration, and raw plate density. 

Stale EP101 a. Stale EP1023] Stale EP 1028] Stale EP 1032] Stale EP 1049] Stale EP 1051] Stale EP 1056-1] Stale EP 1095] Stale EP 1120-5] Stale EP 1144] Stale EP 1168] Stale EP 1211] Stale EP 1238-1] Stale EP 1545] Stale EPM101 a. Stale EPM 1011] Stale EPM 1012] Stale EPM Ilia, Stale EPM 1111] Stale EPM 1112] Stale EPM 1211. See Lead sulfate, tribasic Stale L 703. See Stearic acid Stale L 704. See Polyethylene, oxidized Stale L 705. See Paraffin Stale L 707. See Polyethylene, oxidized Stale L 710. See Polyethylene wax Stale L 712. See Paraffin Stale L 716. See Hydroxystearic acid Stale L 732. See Montan wax Stale M 200. See Calcium stearate Stale M 201. See Calcium laurate Stale M 206. See Barium laurate Stale M 240. See Zinc stearate Stale MB 1023] Stale MB 1032] Stale MB 1095] Stale MB 1168] Stale MB 1211] Stale ... 

EPIstatic 112 Hal base 10 Halbase 10 EP Haro Chem PTS-E Interstab LP 3103 Interstab PTS-E Lead sulfate, tribasic Naftovin T3 Stalo EP 1010 Stalo EP 1023 Stalo EP 1028 Stalo EP 1032 Stalo EP 1049 Stalo EP 1051 Stalo EP 1056-1 Stalo EP 1095 Stalo EP 1120-5 Stalo EP 1144 Stalo EP 1168 Stalo EP 1211 Stalo EP 1238-1 Stalo EP 1545 Stalo EPM 1010 Stalo EPM 1011 Stalo EPM 1012 Stalo EPM 1110 Stalo EPM 1111 Stalo EPM 1112 Stalo EPM 1211 Stalo MB 1023 Stalo MB 1032 Stalo MB 1095 Stalo MB 1168 Stalo MB 1211 Stalo MB 1223 Stalo MB 2191-13 Stalo P 100 Stalo P 103 Tribase EXL Special Tribase XL Tribase 12401-86-4 Sodium oxide 12408-16-1... 

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