FR2254538A1 - Recovery of high melting point organic substances - by fractional sublimation on extended-surface cooling coils - Google Patents

Recovery of high melting point organic substances - by fractional sublimation on extended-surface cooling coils

Info

Publication number
FR2254538A1
FR2254538A1 FR7441539A FR7441539A FR2254538A1 FR 2254538 A1 FR2254538 A1 FR 2254538A1 FR 7441539 A FR7441539 A FR 7441539A FR 7441539 A FR7441539 A FR 7441539A FR 2254538 A1 FR2254538 A1 FR 2254538A1
Authority
FR
France
Prior art keywords
recovery
gas
extended
cooling coils
melting point
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
FR7441539A
Other languages
French (fr)
Other versions
FR2254538B1 (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.)
Veba Oel AG
Original Assignee
Veba Oel AG
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 Veba Oel AG filed Critical Veba Oel AG
Publication of FR2254538A1 publication Critical patent/FR2254538A1/en
Application granted granted Critical
Publication of FR2254538B1 publication Critical patent/FR2254538B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D7/00—Sublimation
    • B01D7/02—Crystallisation directly from the vapour phase
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54—Preparation of carboxylic acid anhydrides
    • C07C51/573—Separation; Purification; Stabilisation; Use of additives

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Furan Compounds (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

Abstract

In a process for recovering high m.pt. organic matls. whose crystals have a high thermal conductivity, from a stream of gas in which the materials are present as vapour mixed with gaseous impurities, the gas stream is cooled to a temp. which is 5-10 degrees C above the satn. temp. but significantly below the m.pt. of the material to be recovered by dilution with air or inert gas. The precooled gas is passed over a cooling surface onto which the organic matl. sublimes to the solid form whilst the impurities remain in the gaseous phase. The cooling surface may be extended surface cooling coils. Process is esp. for recovery of polycarbon acid anhydrides. The materials have recovered directly without water washing and the subsequent used for dehydration the process is continuous.
FR7441539A 1973-12-17 1974-12-17 Recovery of high melting point organic substances - by fractional sublimation on extended-surface cooling coils Granted FR2254538A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732362659 DE2362659C2 (en) 1973-12-17 1973-12-17 Process and device for the production of higher melting organic substances by fractional desublimation

Publications (2)

Publication Number Publication Date
FR2254538A1 true FR2254538A1 (en) 1975-07-11
FR2254538B1 FR2254538B1 (en) 1978-12-22

Family

ID=5900997

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7441539A Granted FR2254538A1 (en) 1973-12-17 1974-12-17 Recovery of high melting point organic substances - by fractional sublimation on extended-surface cooling coils

Country Status (4)

Country Link
JP (1) JPS5727722B2 (en)
DE (1) DE2362659C2 (en)
FR (1) FR2254538A1 (en)
IT (1) IT1027661B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002095A1 (en) * 1977-11-22 1979-05-30 Chemische Werke Hüls Ag Process for the fractional desublimation of dianhydride of 1,2,4,5-benzenetetracarboxylic acid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3421301A1 (en) * 1984-06-08 1985-12-12 Hüls AG, 4370 Marl METHOD FOR PRODUCING PYROMELLITSAEUREDIANHYDRID

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH472364A (en) * 1966-12-22 1969-05-15 Geigy Ag J R Process for the preparation of a new polycyclic amine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002095A1 (en) * 1977-11-22 1979-05-30 Chemische Werke Hüls Ag Process for the fractional desublimation of dianhydride of 1,2,4,5-benzenetetracarboxylic acid

Also Published As

Publication number Publication date
DE2362659A1 (en) 1975-06-19
DE2362659C2 (en) 1982-12-23
FR2254538B1 (en) 1978-12-22
IT1027661B (en) 1978-12-20
JPS5727722B2 (en) 1982-06-12
JPS5095181A (en) 1975-07-29

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Legal Events

Date Code Title Description
ST Notification of lapse