Methods for recovering hydrogen fluoride from a fluorocarbon production process
AssigneeHoneywell International Inc.
InventorsRichard D. Horwath, Gustavo Cerri, Yuon Chiu, Benson May, Jennifer W. McClaine
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Abstract
A method of recovering hydrogen fluoride (HF) in a fluorocarbon production process, including absorbing hydrogen fluoride (HF) from an organic stream into water and distilling the hydrogen fluoride (HF) and water solution to produce a recovered hydrogen fluoride (HF) product. The recovered hydrogen fluoride (HF) product may then be used in a variety of fluorocarbon manufacturing processes.
Claims20
A method of recovering hydrogen fluoride (HF) in a fluorocarbon production process, comprising:
- absorbing hydrogen fluoride (HF) from an organic stream into water in an absorption column to form a first solution of hydrogen fluoride (HF) and water having greater than about 35 wt. % HF;
- conveying at least a portion of the first solution of hydrogen fluoride (HF) and water to a distillation column;
- and
- distilling the first solution of hydrogen fluoride (HF) and water to provide a first distillate comprising at least about 95 wt. % hydrogen fluoride (HF) and a first bottoms stream comprising a second solution of hydrogen fluoride (HF) and water having greater than about 35 wt. % HF.
A method of recovering hydrogen fluoride (HF) in a fluorocarbon production process, comprising:
- absorbing hydrogen fluoride (HF) from an organic stream into water in an absorption column to form a first solution of hydrogen fluoride (HF) and water having greater than about 35 wt. % HF;
- conveying at least a portion of the first solution of hydrogen fluoride (HF) and water to a distillation column;
- distilling the first solution of hydrogen fluoride (HF) and water to provide a first distillate comprising at least about 70 wt. % hydrogen fluoride (HF) and a first bottoms stream comprising a second solution of hydrogen fluoride (HF) and water having greater than about 35 wt. % HF;
- and
- distilling the first distillate to provide a second distillate comprising at least about 95 wt. % hydrogen fluoride (HF) and a second bottoms stream.
A hydrogen fluoride composition, comprising:
- at least 95 wt. % hydrogen fluoride;
- from 0.0001 wt. % to 0.8 wt. % 1,1,1,3,3-pentafluoropropane (HFC-245fa);
- from 0.0001 wt. % to 0.2 wt. % cis-1,3,3,3-tetrafluoropropene (HFO-1234ze (Z));
- from 0.0001 wt. % to 0.1 wt. % trans-1,3,3,3-tetrafluoropropene (HFO-1234ze (E));
- from 0.0001 wt. % to 0.01 wt. % trans-1-chloro-3,3,3-trifluoropropene (HFO-1233zd (E));
- and
- less than 0.06 wt. % other organic products.
Dependencies are inferred from the claim text.