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Title: Chemical Conversion of Anhydrous Hydrogen Fluoride for Safe Disposal

Abstract

A procedure for the safe conversion of a small (~ 1 gram) quantity of anhydrous hydrogen fluoride to calcium fluoride is described. The purpose of the conversion is to put the toxic, corrosive, gaseous compound into a chemical form that is a less toxic solid (calcium fluoride) and easier to dispose of. The hydrogen fluoride, which was contained in a 50 cc metal sample cylinder, was drawn by a small mechanical vacuum pump through an all-metal gas manifold and into a metal trap containing alternating layers of calcium oxide powder and Teflon turnings. The anhydrous hydrogen fluoride reacts with the calcium oxide to produce calcium fluoride and water vapor. Because some of the calcium oxide powder was drawn out of the trap and into the vacuum tubing, it was not possible to quantify the amount of anhydrous hydrogen fluoride converted to calcium fluoride. However, it was noted that there was a temperature rise in the trap when the gas was flowing through it, and no HF gas was detected at the vacuum pump exhaust at this time using a colorimetric Dräger tube. The trap was sealed and disposed of as solid chemical waste.

Authors:
 [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1455316
Report Number(s):
PNNL-27584
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Blake, Thomas A., Brauer, Carolyn S., and Bachmann, Jr., William J. Chemical Conversion of Anhydrous Hydrogen Fluoride for Safe Disposal. United States: N. p., 2018. Web. doi:10.2172/1455316.
Blake, Thomas A., Brauer, Carolyn S., & Bachmann, Jr., William J. Chemical Conversion of Anhydrous Hydrogen Fluoride for Safe Disposal. United States. doi:10.2172/1455316.
Blake, Thomas A., Brauer, Carolyn S., and Bachmann, Jr., William J. Tue . "Chemical Conversion of Anhydrous Hydrogen Fluoride for Safe Disposal". United States. doi:10.2172/1455316. https://www.osti.gov/servlets/purl/1455316.
@article{osti_1455316,
title = {Chemical Conversion of Anhydrous Hydrogen Fluoride for Safe Disposal},
author = {Blake, Thomas A. and Brauer, Carolyn S. and Bachmann, Jr., William J.},
abstractNote = {A procedure for the safe conversion of a small (~ 1 gram) quantity of anhydrous hydrogen fluoride to calcium fluoride is described. The purpose of the conversion is to put the toxic, corrosive, gaseous compound into a chemical form that is a less toxic solid (calcium fluoride) and easier to dispose of. The hydrogen fluoride, which was contained in a 50 cc metal sample cylinder, was drawn by a small mechanical vacuum pump through an all-metal gas manifold and into a metal trap containing alternating layers of calcium oxide powder and Teflon turnings. The anhydrous hydrogen fluoride reacts with the calcium oxide to produce calcium fluoride and water vapor. Because some of the calcium oxide powder was drawn out of the trap and into the vacuum tubing, it was not possible to quantify the amount of anhydrous hydrogen fluoride converted to calcium fluoride. However, it was noted that there was a temperature rise in the trap when the gas was flowing through it, and no HF gas was detected at the vacuum pump exhaust at this time using a colorimetric Dräger tube. The trap was sealed and disposed of as solid chemical waste.},
doi = {10.2172/1455316},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {6}
}

Technical Report:

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