GB145071A - Improvements in the manufacture and production of phthalic anhydride - Google Patents

Improvements in the manufacture and production of phthalic anhydride

Info

Publication number
GB145071A
GB145071A GB16298/20A GB1629820A GB145071A GB 145071 A GB145071 A GB 145071A GB 16298/20 A GB16298/20 A GB 16298/20A GB 1629820 A GB1629820 A GB 1629820A GB 145071 A GB145071 A GB 145071A
Authority
GB
United Kingdom
Prior art keywords
pumice
air
charcoal
mixed
catalyst
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
GB16298/20A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB145071A publication Critical patent/GB145071A/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
    • C07C51/313—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with molecular oxygen

Abstract

Phthalic anhydride is prepared by passing naphthalene vapour mixed with oxygen-containing gas, e.g. air, over an oxygen carrier, such as oxides of vanadium, at a temperature below red heat, that is, below about 580 DEG C. The catalyst may be distributed over a support, such as pumice. According to the Specification as open to inspection under Sect. 91 (3) (a), molybdenum oxides are also suitable catalysts for the reaction. The catalyst may be prepared for example by impregnating pumice with a colloidal solution of vanadic acid mixed with starch or finely-divided blood charcoal, drying, and heating in air to burn off the carbonaceous matter; or by soaking pumice in gum solution, and then shaking it with ammonium vanadium; or powdered pumice is mixed with ammonium vanadate and suitably formed; or ammonium molybdate is precipitated on pumice by means of blood charcoal, and the charcoal then burnt off by heating in air. This subject-matter does not appear in the Specification as accepted.ALSO:Phthalic anhydride is prepared by passing naphthalene vapour mixed with oxygen-containing gas, e.g. air, over an oxygen carrier, such as oxides of vanadium, at a temperature below red heat, that is below about 580 DEG C. The catalyst may be distributed over a support, such as pumice. According to the Specification as open to inspection under Sect. 91 (3) (a), molybdenum oxides are also suitable catalysts for the reaction. The catalyst may be prepared for example by impregnating pumice with a colloidal solution of vanadic acid mixed with starch or finely-divided blood charcoal, drying, and heating in air to burn off the carbonaceous matter; or by soaking pumice in gum solution, and then shaking it with ammonium vanadate; or powdered pumice is mixed with ammonium vanadate and suitably formed; or ammonium molybdate is precipitated on pumice by means of blood charcoal, and the charcoal then burnt off by heating in air. This subject-matter does not appear in the Specification as accepted.
GB16298/20A 1916-06-28 1920-06-16 Improvements in the manufacture and production of phthalic anhydride Expired GB145071A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE145071X 1916-06-28

Publications (1)

Publication Number Publication Date
GB145071A true GB145071A (en) 1921-03-31

Family

ID=5670569

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16298/20A Expired GB145071A (en) 1916-06-28 1920-06-16 Improvements in the manufacture and production of phthalic anhydride

Country Status (1)

Country Link
GB (1) GB145071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586128A (en) * 1950-06-20 1952-02-19 Pan American Refining Corp Preparation of phthalic anhydride from 3. 4. 0. bicyclic nonyl hydrocarbon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586128A (en) * 1950-06-20 1952-02-19 Pan American Refining Corp Preparation of phthalic anhydride from 3. 4. 0. bicyclic nonyl hydrocarbon

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