FR1471932A - Procédé de purification du dianhydride pyromellique - Google Patents

Procédé de purification du dianhydride pyromellique

Info

Publication number
FR1471932A
FR1471932A FR54656A FR54656A FR1471932A FR 1471932 A FR1471932 A FR 1471932A FR 54656 A FR54656 A FR 54656A FR 54656 A FR54656 A FR 54656A FR 1471932 A FR1471932 A FR 1471932A
Authority
FR
France
Prior art keywords
purification process
pyromellic
dianhydride
pyromellic dianhydride
purification
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.)
Expired
Application number
FR54656A
Other languages
English (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.)
Gelsenberg Benzin AG
Original Assignee
Gelsenberg Benzin 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
Priority claimed from DEG43153A external-priority patent/DE1289039B/de
Application filed by Gelsenberg Benzin AG filed Critical Gelsenberg Benzin AG
Priority to FR54656A priority Critical patent/FR1471932A/fr
Application granted granted Critical
Publication of FR1471932A publication Critical patent/FR1471932A/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/44—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of scythes or sickles
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/14—Machines of the continuous-rod type
    • A24C5/28—Cutting-off the tobacco rod
    • A24C5/30—Machines combined with devices for grinding the knives
    • 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)
  • Mechanical Engineering (AREA)
FR54656A 1965-03-24 1966-03-23 Procédé de purification du dianhydride pyromellique Expired FR1471932A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR54656A FR1471932A (fr) 1965-03-24 1966-03-23 Procédé de purification du dianhydride pyromellique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG43153A DE1289039B (de) 1965-03-24 1965-03-24 Verfahren zur Reinigung von Pyromellithsaeuredianhydrid
FR54656A FR1471932A (fr) 1965-03-24 1966-03-23 Procédé de purification du dianhydride pyromellique

Publications (1)

Publication Number Publication Date
FR1471932A true FR1471932A (fr) 1967-03-03

Family

ID=25978685

Family Applications (1)

Application Number Title Priority Date Filing Date
FR54656A Expired FR1471932A (fr) 1965-03-24 1966-03-23 Procédé de purification du dianhydride pyromellique

Country Status (1)

Country Link
FR (1) FR1471932A (fr)

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