FR2378556A1 - 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 recovered

Info

Publication number
FR2378556A1
FR2378556A1 FR7724796A FR7724796A FR2378556A1 FR 2378556 A1 FR2378556 A1 FR 2378556A1 FR 7724796 A FR7724796 A FR 7724796A FR 7724796 A FR7724796 A FR 7724796A FR 2378556 A1 FR2378556 A1 FR 2378556A1
Authority
FR
France
Prior art keywords
scrubbing
soln
liq
waste gas
crystallisation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7724796A
Other languages
French (fr)
Other versions
FR2378556B3 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RADEBERG EMAILSCHMELZE
Original Assignee
RADEBERG EMAILSCHMELZE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RADEBERG EMAILSCHMELZE filed Critical RADEBERG EMAILSCHMELZE
Publication of FR2378556A1 publication Critical patent/FR2378556A1/en
Application granted granted Critical
Publication of FR2378556B3 publication Critical patent/FR2378556B3/fr
Granted legal-status Critical Current

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.
FR7724796A 1976-08-17 1977-08-11 Waste gas contg. hydrofluoric acid - purified by scrubbing with caustic soda soln. from which sodium fluoride crystals are recovered Granted FR2378556A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD194345A DD127548A1 (en) 1976-08-17 1976-08-17

Publications (2)

Publication Number Publication Date
FR2378556A1 true FR2378556A1 (en) 1978-08-25
FR2378556B3 FR2378556B3 (en) 1980-10-10

Family

ID=5505436

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7724796A Granted FR2378556A1 (en) 1976-08-17 1977-08-11 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0037450A1 (en) * 1980-04-04 1981-10-14 Calgon Corporation Process for the removal of acid and acid precursor gases and vapors from gas streams

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0037450A1 (en) * 1980-04-04 1981-10-14 Calgon Corporation Process for the removal of acid and acid precursor gases and vapors from gas streams

Also Published As

Publication number Publication date
YU190777A (en) 1982-05-31
IT1143593B (en) 1986-10-22
HU176220B (en) 1981-01-28
DD127548A1 (en) 1977-09-28
FR2378556B3 (en) 1980-10-10
NL7708551A (en) 1978-02-21

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Legal Events

Date Code Title Description
ST Notification of lapse