GB961062A - Method of separating benzoic acid from the crude product of the oxidation of toluene - Google Patents

Method of separating benzoic acid from the crude product of the oxidation of toluene

Info

Publication number
GB961062A
GB961062A GB42058/61A GB4205861A GB961062A GB 961062 A GB961062 A GB 961062A GB 42058/61 A GB42058/61 A GB 42058/61A GB 4205861 A GB4205861 A GB 4205861A GB 961062 A GB961062 A GB 961062A
Authority
GB
United Kingdom
Prior art keywords
benzoic acid
vessel
toluene
volatile components
line
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
GB42058/61A
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.)
Instytut Chemii Ogolnej
Original Assignee
Instytut Chemii Ogolnej
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 Instytut Chemii Ogolnej filed Critical Instytut Chemii Ogolnej
Publication of GB961062A publication Critical patent/GB961062A/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
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
    • 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
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • 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
    • 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
    • C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
    • 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
    • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/04—Monocyclic monocarboxylic acids
    • C07C63/06—Benzoic acid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
    • C07C63/14—Monocyclic dicarboxylic acids
    • C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
    • C07C63/26—1,4 - Benzenedicarboxylic acid

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)
  • General Chemical & Material Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

<FORM:0961062/C1/1> Benzoic acid is separated from the crude oxidation product of toluene, after preliminary distillation to remove excess toluene, by passing superheated steam, introduced through line 1a, through the product contained in vessel 1. The benzoic acid and other volatile components distil over with the steam via line 2a into the heat-insulated vessel 2, leaving a residue of non-volatile components such as dicarboxylic acids and esters in vessel 1. Vessel 2 contains boiling water (not more than 40 Kgs. of water/Kg. of benzoic acid) up to level 4, into which pass the vapours from line 2a. The benzoic acid collects as a molten layer 5 under the boiling water, and the more volatile components, i.e. the toluene residue, benzaldehyde and aliphatic monocarboxylic acids are distilled over with saturated steam at 100 DEG C. and condense in the cooling coil 3b of the cooler 3. The molten layer of benzoic acid in vessel 2 is introduced into a crystallizer (not shown) and allowed to crystallize. Specification 961,061 is referred to.
GB42058/61A 1961-05-08 1961-11-24 Method of separating benzoic acid from the crude product of the oxidation of toluene Expired GB961062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL41461 1961-05-08

Publications (1)

Publication Number Publication Date
GB961062A true GB961062A (en) 1964-06-17

Family

ID=19935995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42058/61A Expired GB961062A (en) 1961-05-08 1961-11-24 Method of separating benzoic acid from the crude product of the oxidation of toluene

Country Status (1)

Country Link
GB (1) GB961062A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159109A (en) * 1990-06-25 1992-10-27 Amoco Corporation Purification of organic polycarboxylic acids
CN113582825A (en) * 2021-07-05 2021-11-02 武汉有机实业有限公司 Method for recovering food-grade benzaldehyde from benzoic acid rectification low-boiling-point substance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159109A (en) * 1990-06-25 1992-10-27 Amoco Corporation Purification of organic polycarboxylic acids
CN113582825A (en) * 2021-07-05 2021-11-02 武汉有机实业有限公司 Method for recovering food-grade benzaldehyde from benzoic acid rectification low-boiling-point substance
CN113582825B (en) * 2021-07-05 2023-10-24 武汉有机实业有限公司 Method for recovering food-grade benzaldehyde from benzoic acid rectification low-boiling-point substances

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