A reaction system and method for preparing compounds or intermediates from solid reactant materials is provided. In a specific aspect, a reaction system and methods are provided for preparation of boron-containing precursor compounds useful as precursors for ion implantation of boron in substrates. In another specific aspect, a reactor system and methods are provided for manufacture of boron precursors such as B.sub.2F.sub.4.

An isotopically-enriched, boron-containing compound comprising two or more boron atoms and at least one fluorine atom, wherein at least one of the boron atoms contains a desired isotope of boron in a concentration or ratio greater than a natural abundance concentration or ratio thereof. The compound may have a chemical formula of B.sub.2F.sub.4. Synthesis methods for such compounds, and ion implantation methods using such compounds, are described, as well as storage and dispensing vessels in which the isotopically-enriched, boron-containing compound is advantageously contained for subsequent dispensing use.

The present invention relates, in general, to the purification of boron trichloride (BCl.sub.3). More particularly, the invention relates to a process for minimizing silicon tetrachloride (SiCl.sub.4) formation in BCl.sub.3 production and/or the removal of SiCl.sub.4 in BCl.sub.3 product stream by preventing/minimizing the silicon source in the reaction chambers. In addition, a hydride material may be used to convert any SiCl.sub.4 present to SiH.sub.4 which is easier to remove. Lastly freeze separation would replace fractional distillation to remove SiCl.sub.4 from BCl.sub.3 that has been partially purified to remove light boilers.

The present invention is directed to an organic polymerizable composition for producing a molded polymeric article. The composition includes a mold release agent of ionic fluoride and/or ionic fluoride precursor present in an amount sufficient to effect at least partial demolding of the polymeric article from a mold. Molded articles also are provided.

The present disclosure relates to the field of special electronic gases, in particular to a method for purifying electronic-grade boron trichloride. The method includes the following steps: (S.1), filling an adsorption composition into adsorbers; (S.2), vacuumizing the adsorbers to remove air from the adsorbers, and then introducing a high-purity boron trichloride gas; and (S.3), introducing a boron trichloride feed gas into the adsorbers, such that the boron trichloride feed gas is in contact with the adsorption composition, and collecting a gas flowing out of the adsorbers to obtain an electronic-grade boron trichloride gas. According to the present disclosure, coordination formed between hydrogen chloride impurities and boron trichloride can be eliminated effectively, thereby improving adsorption and purification effects of the boron trichloride. Meanwhile, the adsorption composition in the present disclosure has an excellent adsorption effect on an impurity gas, and a concentration of the impurity gas in the boron trichloride obtained after simple adsorption treatment can be decreased to a ppb (part per billion) level.

The present invention provides a method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction. The method for separation and recovery of boron trifluoride and complexes thereof in an olefin polymerization reaction, comprising: 1) subjecting a mixture obtained after an olefin polymerization reaction to flash distillation separation to separate part of gaseous boron trifluoride; 2) subjecting the liquid phase obtained from the flash distillation separation to membrane separation to obtain complexes of boron trifluoride and a crude product of the olefin polymerization reaction; and 3) subjecting the crude product of the olefin polymerization reaction obtained in step 2) to gas stripping separation to separate the remaining gaseous boron trifluoride, so as to obtain a pure product of the olefin polymerization reaction The present invention designs a matching process based on the polymorphic characteristics of boron trifluoride and complexes thereof to achieve efficient separation of boron trifluoride and complexes thereof from polymerization intermediates.