Removal from, boron chloride

The AcK can be removed from the nitrobenzene by contacting the organic phase with two volumes of 1 N HC1. In the reported experiments, a chloride soln. containing AcK and AcX was prepared. Ha-borate was added until the pH was 9 The soln. was. then made 0.0 molar In sodium tetrapbenyl boron. (Before It was added this reagent was purified by contact with Al(QH)s and filtration. ) The soln. was then stirred 3 min with an equal volume of nitrobenzene. 

Crystallized boron is produced when the oxid, chlorid or fluorid is reduced by Al. It crystallizes in quadratic prisms more or less transparent, and varying in color from a faint yellow to deep garnet-red very hard sp. gr. 2.68. It burns when strongly heated in 0, and readily in Cl it also combines with N, which it is capable of removing from NH at a high temperature. 

Recovery Process. Boron values are recovered from brine of Seades Lake by North American Chemicals Corp. In one process the brine is heated to remove some water and burkeite. The remaining brine is cooled to remove potassium chloride. This cooled brine is then transferred to another crystallizer where borax pentahydrate, Na2B40y 5H20, precipitates (18). In a separate process, boron is removed by Hquid—Hquid extraction followed by stripping with dilute sulfuric acid (19). Evaporator-crystallizers are used to recover boric acid [10043-35-3] H BO. In a third process, borax is recovered by refrigerating a carbonated brine. 

None of the common ions interferes at a 100 to 1 mole ratio to boron. In addition, at least a 280 to 1 mole ratio of fluoride to boron, as well as a 100 to 1 mole ratio of chloride to boron, can be tolerated. Fig. 2.22 shows an ion chromatogram of a sample which initially contained sulphate, chloride, nitrate, fluoride and chromate at a 100 to 1 mole ratio and which was prepared according to the standard procedure. As shown, tetrafluoroborate peaks are well resolved from all the residual amounts of these anions not completely removed by the XE-243 column treatment. 

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