Trimethyl borate regenerated from spent sodium borohydride after hydrogen production

Cheng Hong Liu, Bing Hung Chen, Duu Jong Lee, Jie Ren Ku, Fanghei Tsau

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Sodium metaborate (NaBO2) is the hydrolysate of sodium borohydride (NaBH4) for hydrogen production. Trimethyl borate (B(OCH3)3), the major reactant for producing sodium borohydride via the Brown-Schlesinger process, is successfully regenerated from sodium metaborate (NaBO2) via a sequential process including reacting with sulfuric acid, cooling crystallization, and reactive esterification distillation. The metaborate is first converted to boric acid (H 3BO3) by reacting with sulfuric acid, bypassing formation of borax (Na2B4O7•10H2O) required in a conventional process. Cooling crystallization is utilized to separate and purify boric acid from coexisting sodium sulfate (Na 2SO4). Subsequently, trimethyl borate is formed via esterification of boric acid with methanol, in which reactive esterification distillation is adopted to facilitate the esterification and purify the product. Formation of boric acid and trimethyl borate is confirmed with X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography (GC). Approximately 55% of sodium metaborate could be converted to boric acid, along with a production yield from 74.1% to 96.5% realized for trimethyl borate esterified from the as-produced boric acid.

Original languageEnglish
Pages (from-to)9864-9869
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume49
Issue number20
DOIs
Publication statusPublished - 2010 Oct 20

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering

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