IT1143593B - Waste gas contg. hydrofluoric acid - purified by scrubbing with caustic soda soln. from which sodium fluoride crystals are recovered - Google Patents
Waste gas contg. hydrofluoric acid - purified by scrubbing with caustic soda soln. from which sodium fluoride crystals are recoveredInfo
- Publication number
- IT1143593B IT1143593B IT5052077A IT5052077A IT1143593B IT 1143593 B IT1143593 B IT 1143593B IT 5052077 A IT5052077 A IT 5052077A IT 5052077 A IT5052077 A IT 5052077A IT 1143593 B IT1143593 B IT 1143593B
- Authority
- IT
- Italy
- Prior art keywords
- scrubbing
- soln
- liq
- waste gas
- crystallisation
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
Exhaust gases contg. F are finally purified by scrubbing with an alkaline absorbent, esp. NaOH- or KOH- soln. to obtain crystalline prods. contg. F2. A single process circuit is used for both scrubbing and crystallisation with a single scrubber soln. and the supernatant liq. remaining after crystallisation is completely returned to the scrubbing tower. From the tower, the liq. travels through an intermediate cooler to a crystallising vessel, and/or fresh NaOH or KOH soln. is added to the liq. before crystallisation so a constant pH is maintained in the alkaline region. Fresh water is pref. added continuously to the upper part of the scrubbing tower to saturate the gas and also undertake a final cleaning operation. The waste gas entering the environment after treatment. contains less than 1 mg F2/m3 of gas; and no waste water is generated in the process. The fluoride crystals obtd. are commercially useful.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD194345A DD127548A1 (en) | 1976-08-17 | 1976-08-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1143593B true IT1143593B (en) | 1986-10-22 |
Family
ID=5505436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT5052077A IT1143593B (en) | 1976-08-17 | 1977-08-01 | Waste gas contg. hydrofluoric acid - purified by scrubbing with caustic soda soln. from which sodium fluoride crystals are recovered |
Country Status (6)
Country | Link |
---|---|
DD (1) | DD127548A1 (en) |
FR (1) | FR2378556A1 (en) |
HU (1) | HU176220B (en) |
IT (1) | IT1143593B (en) |
NL (1) | NL7708551A (en) |
YU (1) | YU190777A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0037450B1 (en) * | 1980-04-04 | 1984-09-12 | Calgon Corporation | Process for the removal of acid and acid precursor gases and vapors from gas streams |
-
1976
- 1976-08-17 DD DD194345A patent/DD127548A1/xx unknown
-
1977
- 1977-08-01 IT IT5052077A patent/IT1143593B/en active
- 1977-08-02 NL NL7708551A patent/NL7708551A/en not_active Application Discontinuation
- 1977-08-03 YU YU01907/77A patent/YU190777A/en unknown
- 1977-08-11 FR FR7724796A patent/FR2378556A1/en active Granted
- 1977-08-12 HU HU77EA177A patent/HU176220B/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR2378556B3 (en) | 1980-10-10 |
DD127548A1 (en) | 1977-09-28 |
NL7708551A (en) | 1978-02-21 |
HU176220B (en) | 1981-01-28 |
YU190777A (en) | 1982-05-31 |
FR2378556A1 (en) | 1978-08-25 |
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