Process for recovering boron trifluoride from an impure gaseous boron trifluoride residue

Patent · Tue Jul 24 04:00:00 EDT 1990

OSTI ID:6556779

Evans, F E; Schroeder, K H; Wagner, W J

This patent describes a method for removing sulfur dioxide from a boron trifluoride stream. It comprises: condensing a gaseous boron trifluoride stream; distilling the condensed boron trifluoride stream to yield pure boron trifluoride and a liquid boron trifluoride residue wherein the liquid boron trifluoride residue comprises by weight: about 40 to about 95% boron trifluoride, about 5 to about 30% sulfur dioxide, about 0 to 19% sulfur trioxide, about 0 to about 0.2% silicon fluoride, about 0 to about 1.0% arsenic fluoride, and about 0 to about 0.1% antimony fluoride; vaporizing the liquid boron trifluoride residue; feeding the gaseous boron trifluoride residue into a mixture of boric and sulfuric acids; and removing the unabsorbed sulfur dioxide from the acid mixture.

• Assignee: Allied-Signal Inc., Morris County, NJ (USA)
• Patent Number(s): A; US 4943423
• Application Number: PPN: US s 7-277153
• OSTI ID: 6556779
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ACIDIFICATION
BORON COMPOUNDS
BORON FLUORIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
DISTILLATION
EVAPORATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION CONTROL
PROCESSING
REMOVAL
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTE MANAGEMENT
WASTE PROCESSING