GB944232A - Recovery of phthalic anhydride - Google Patents

Recovery of phthalic anhydride

Info

Publication number
GB944232A
GB944232A GB213659A GB213659A GB944232A GB 944232 A GB944232 A GB 944232A GB 213659 A GB213659 A GB 213659A GB 213659 A GB213659 A GB 213659A GB 944232 A GB944232 A GB 944232A
Authority
GB
United Kingdom
Prior art keywords
phthalic anhydride
gases
water
cyclone separator
amount
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
GB213659A
Inventor
Wesley Donald Betts
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.)
COAL TAR RES ASS
Original Assignee
COAL TAR RES ASS
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 COAL TAR RES ASS filed Critical COAL TAR RES ASS
Priority to GB213659A priority Critical patent/GB944232A/en
Publication of GB944232A publication Critical patent/GB944232A/en
Expired 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
    • C07C51/54—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)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Phthalic anhydride in solid form is recovered from hot gases containing phthalic anhydride vapour by introducing water droplets into the hot gases in a cyclone separator by the injection of water through a spray nozzle in the inlet of the cyclone separator, cooling the gases directly by the evaporation of water droplets thus precipitating phthalic anhydride direct which is separated from the cooled gases by the cyclone separator. To minimise the amount of water required the hot reaction gases from the phthalic anhydride manufacturing unit may be precooled by indirect contact to not below 135 DEG C., if subsequently the amount of water injected does not largely exceed the amount needed to effect condensation then saturation will be avoided and hydrolysis will not follow to any substantial extent. The coprecipitation of maleic anhydride may be avoided if the temperature of the cooled gas is kept above 80 DEG C.
GB213659A 1959-01-20 1959-01-20 Recovery of phthalic anhydride Expired GB944232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB213659A GB944232A (en) 1959-01-20 1959-01-20 Recovery of phthalic anhydride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB213659A GB944232A (en) 1959-01-20 1959-01-20 Recovery of phthalic anhydride

Publications (1)

Publication Number Publication Date
GB944232A true GB944232A (en) 1963-12-11

Family

ID=9734224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB213659A Expired GB944232A (en) 1959-01-20 1959-01-20 Recovery of phthalic anhydride

Country Status (1)

Country Link
GB (1) GB944232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206010A2 (en) * 1985-06-19 1986-12-30 BASF Corporation Phthalic anhydride process and product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206010A2 (en) * 1985-06-19 1986-12-30 BASF Corporation Phthalic anhydride process and product
EP0206010A3 (en) * 1985-06-19 1988-01-13 Basf Corporation Phthalic anhydride process and product

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