JOURNAL OF BORON
4. Concluding remarks
In this study, it is determined that 10B isotope ratio can be increased over 27% in a single pass CAC opera-tion. According to the best of our knowledge, in the open literature, this figure is the highest 10B isotope enrichment ever reported in a single pass chromato-graphic separation study. We concluded that 10B iso-tope enrichment ratio can be further increased with P-CAC apparatus either operating in recycle mode or with the employment of P-CAC apparatus having lon-ger bed height or both. Furthermore, since P-CAC is a continuous process, very large volumes of feed solu-tion can be processed for 10B isotope enrichment that cannot be matched by conventional chromatography.
Acknowledgements
This work was supported by National Boron Research Institute – BOREN, under project number2011.B0341.
Sağlam G. and Özdural A. R. / BORON 1 (1), 20 - 27, 2016
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BORON 1 (1), 28 - 32, 2016
ABSTRACT
A method of microwave assisted synthesis of a new surfactant family whose hydrophilic head is derived from the ethanolamine adduct of boric acid containing polar –NR-B(OH)2 , -O-B(OH)2, and (OH)3B→NR-. These compounds were synthesized in two steps. First the boric acid adduct was prepared by reacting ethylene diamine with boric acid and then the adduct was reacted with alkenyl succinic anhydride. The product with boronated alkanol amine showed good yields (>90%). Both reaction steps were car-ried out by microwave. Boron NMR suggests that probably Boron is mostly in –O-B(OH)2 form (~80%), about 13% as (OH)3B→NR-(CH2)2-O-B(OH)2, and approximately 7% in the form of (OH)2B-NR-[(CH2)2-OH]2. The prod-uct apparently exhibited good detergency. Parameters characterizing their surface activity (critical micelle concentration, surface tension, and mo-lecular area at the water−air interface) was studied with the dodecenyl succinic anhydride derivative of the Boronated diethanolamine adduct.
The compounds show promise for use in organized molecular systems.
By altering the hydrocarbon chain length of alkenyl succinic anhydride, the derivatives can be either water or solvent soluble. Hexadecenyl suc-cinic anhydride derivatives are highly oil-soluble, whereas the dodecenyl succinic acid anhydride derivative is primarily water soluble. Total B2O3 content in the product is approximately 12.4%. Besides their surface ac-tivity, this series of products have a great potential for treating wood for antifungal and anti-termite properties.