EP1530561A1 - Procede de fabrication de dichlorure d'acide phtalique - Google Patents

Procede de fabrication de dichlorure d'acide phtalique

Info

Publication number
EP1530561A1
EP1530561A1 EP03793692A EP03793692A EP1530561A1 EP 1530561 A1 EP1530561 A1 EP 1530561A1 EP 03793692 A EP03793692 A EP 03793692A EP 03793692 A EP03793692 A EP 03793692A EP 1530561 A1 EP1530561 A1 EP 1530561A1
Authority
EP
European Patent Office
Prior art keywords
phosgene
formula
continuously
metered
dialkylformamide
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.)
Withdrawn
Application number
EP03793692A
Other languages
German (de)
English (en)
Inventor
Jörn Stölting
Reinhard Lantzsch
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.)
Bayer CropScience AG
Original Assignee
Bayer CropScience 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 Bayer CropScience AG filed Critical Bayer CropScience AG
Publication of EP1530561A1 publication Critical patent/EP1530561A1/fr
Withdrawn legal-status Critical Current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
    • C07C51/58—Preparation of carboxylic acid halides
    • C07C51/60—Preparation of carboxylic acid halides by conversion of carboxylic acids or their anhydrides or esters, lactones, salts into halides with the same carboxylic acid part

Definitions

  • the invention relates to a new process for the preparation of phthaloyl dichloride (benzene-l, 2-dicarboxylic acid dichloride) from phthalic anhydride.
  • phthaloyl chloride can be prepared from phthalic hydride by reaction with suitable agents for the introduction of chlorine (“chlorinating agents”).
  • phthaloyl dichloride is obtained by reacting phthalic anhydride with trichloromethane or carbon tetrachloride in the presence of zinc chloride (cf. US Pat. No. 2,051,096).
  • this implementation requires very high temperatures; in addition, trichloromethane and carbon tetrachloride are very problematic reaction components for industrial purposes today.
  • Phthalic acid dichloride can also be obtained by reacting phthalic anhydride with thionyl chloride in the presence of zinc chloride (cf. J. Am. Chem. Soc. 1937. 59, 206-208). This implementation also requires very high temperatures. The yield and quality of the product are not entirely satisfactory with this method.
  • Phthalic acid dichloride can also be obtained by reacting phthalic anhydride with phosphorus (V) chloride (phosphorus pentachloride) (cf. Can. J. Chem. 1970. 48, 3566-3571). Here too, the yield of the desired product is very unsatisfactory.
  • the task was therefore to provide a process which is suitable for industrial implementation and by which phthalic acid dichloride can be obtained from an easily accessible starting material, e.g. Phthalic anhydride can be obtained in very good yields using inexpensive auxiliaries, using reasonable amounts of energy and avoiding the accumulation of large amounts of coupling products.
  • continuously means that the respective reaction component (phosgene and / or N, N-dialkylformamide) is metered into the reaction mixture continuously and uniformly over the entire reaction time.
  • the respective reaction component phosgene and / or N, N-dialkylformamide
  • ..semi-continuous means that the respective reaction component (phosgene and / or N, N-dialkylformamide) is metered into the reaction mixture in portions, over defined periods of time.
  • the individual portions are preferably of equal size and the individual time periods preferably of the same length.
  • the present invention thus relates to a process for the preparation of phthaloyl chloride of the formula (I)
  • R 1 and R 2 independently of one another represent straight-chain or branched alkyl
  • the phthalic anhydride of the formula (IT) to be used in the process according to the invention from the starting material is a known, commercially available synthetic chemical.
  • the phosgene used as a means of introducing chlorine is also known.
  • R 1 and R 2 independently of one another preferably represent straight-chain or branched Ci-Co-alkyl, particularly preferably C 1 -C 6 -alkyl.
  • N, N-dialkyi-formamides of the formula (ID-) are: N, N-dimethyl-formamide, N, N-diethyl-formamide, N, N-di-n-propyl-formamide, N, N - Diisopropyl-formamide, N, N-di-n-butyl-formamide and N, N-diisobutyl-formamide.
  • N 5 N-dialkylformamides are contaminated organic synthetic chemicals or
  • the process according to the invention is carried out in the presence of an inert diluent.
  • diluents hydrocarbons, such as pentane, hexane, heptane, octane, cyclohexane, methylcyclohexane,
  • Benzene, toluene, xylene, and halogenated hydrocarbons such as dichloromethane, trichloromethane, carbon tetrachloride, chlorobenzene or dichlorobenzene.
  • dichloromethane trichloromethane
  • carbon tetrachloride chlorobenzene or dichlorobenzene.
  • chlorobenzene or dichlorobenzene.
  • Toluene and chlorobenzene are particularly preferred as diluents.
  • the method according to the invention can be carried out within a relatively wide temperature range.
  • the reaction is preferably carried out at temperatures between 40 ° C. and 120 ° C., in particular between 55 ° C. and 100 ° C.
  • the process according to the invention is generally carried out under normal pressure. However, it is also possible to carry out the process according to the invention under elevated or reduced pressure - generally between 0.1 bar and 50 bar, preferably between 1 bar and 10 bar.
  • 1 mol of phthalic anhydride of the formula (II) is generally employed between 1.2 mol and 2.5 mol, preferably between 1.4 mol and 2.2 mol of phosgene, and also between 0.01 mol and 0.20 moles, preferably between 0.02 and 0.10 moles of N, N-dialkyl-formamide
  • the phthalic anhydride is placed in an inert diluent and the mixture is heated to the reaction temperature.
  • the phosgene and the N, N-dialkyl-formamide of the formula (1H) are either either distributed continuously over the entire reaction time or “semi-continuously”, that is to say distributed over approximately equally long periods and according to the number of these periods over approximately equally large periods Portions divided, dosed in portions.
  • both the phosgene and the N, N-dialkylformamide of the formula (HI) are metered in continuously.
  • both the phosgene and the N, N-dialkylformamide of the formula (HI) are metered in “semi-continuously” in several portions.
  • the phosgene is metered in continuously, while the N, N-dialkylformamide of the formula (DI) is metered in “semi-continuously” distributed over several portions.
  • the phosgene is metered in “semi-continuously” distributed over several portions, while the N, N-dialkylformamide is the
  • Formula (DI) is metered in continuously.
  • a reaction time of 5 to 15 hours is particularly advantageous, with the N, N-dialkylformamide of the formula (DI) advantageously being added every 15 to 90 minutes and the phosgene being continuous or semi-continuously "is metered.
  • reaction mixture is advantageously kept for a further 1 to 2 hours at the stated reaction temperature and then worked up by distillation under reduced pressure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention concerne un nouveau procédé de fabrication de dichlorure d'acide phtalique (dichlorure d'acide benzol-1,2-dicarboxylique) à partir d'anhydride d'acide phtalique, par réaction avec phosgène en présence d'un N,N-dialkyl-formamide.
EP03793692A 2002-08-16 2003-08-06 Procede de fabrication de dichlorure d'acide phtalique Withdrawn EP1530561A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10237579A DE10237579A1 (de) 2002-08-16 2002-08-16 Verfahren zum Herstellen von Phthalsäuredichlorid
DE10237579 2002-08-16
PCT/EP2003/008684 WO2004022520A1 (fr) 2002-08-16 2003-08-06 Procede de fabrication de dichlorure d'acide phtalique

Publications (1)

Publication Number Publication Date
EP1530561A1 true EP1530561A1 (fr) 2005-05-18

Family

ID=30775341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03793692A Withdrawn EP1530561A1 (fr) 2002-08-16 2003-08-06 Procede de fabrication de dichlorure d'acide phtalique

Country Status (5)

Country Link
US (1) US20060122426A1 (fr)
EP (1) EP1530561A1 (fr)
AU (1) AU2003250214A1 (fr)
DE (1) DE10237579A1 (fr)
WO (1) WO2004022520A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004024807A1 (de) * 2004-05-17 2005-12-08 Bayer Chemicals Ag Verfahren zur Herstellung von Phthalsäuredichlorid
DE102004057146A1 (de) * 2004-11-26 2006-06-01 Basf Ag Verfahren zur Herstellung von Phthalsäuredichlorid
DE102004058519A1 (de) * 2004-12-04 2006-06-14 Bayer Cropscience Ag Verfahren zum Herstellen von 3-Halophthalsäuredichloriden
KR100745734B1 (ko) * 2005-12-13 2007-08-02 삼성에스디아이 주식회사 탄소나노튜브의 형성방법 및 이를 이용한 전계방출소자의제조방법
CN106674166B (zh) * 2016-12-20 2018-09-25 重庆市化工研究院 呋喃甲酰氯的制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810940A (en) * 1972-04-07 1974-05-14 Union Carbide Corp Process for producing acid chlorides
JPS56103131A (en) * 1980-01-22 1981-08-18 Mitsui Toatsu Chem Inc Preparation of carboxylic acid chloride

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004022520A1 *

Also Published As

Publication number Publication date
DE10237579A1 (de) 2004-02-26
AU2003250214A1 (en) 2004-03-29
US20060122426A1 (en) 2006-06-08
WO2004022520A1 (fr) 2004-03-18

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