JPH06211739A - Production of 4,4'-biphenyldicarboxylic acid - Google Patents

Abstract

(57) [Summary] [Purpose] The main object is to provide a method capable of producing 4,4'-BDCA with high yield and high purity. [Structure] In a solvent containing an aliphatic monocarboxylic acid having 3 or less carbon atoms, in the presence of (a) a cobalt compound and / or a manganese compound, (b) a copper compound and (c) bromine or a compound thereof, 4, A process for producing 4,4'-biphenyldicarboxylic acid, which comprises oxidizing 4'-diisopropylbiphenyl or an oxidized derivative thereof with molecular oxygen.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a process for producing 4,4'-biphenyldicarboxylic acid.

[0002]

2. Description of the Related Art 4,4'-biphenyldicarboxylic acid (hereinafter, unless otherwise required, 4,4'-BDCA
Is useful as a raw material for the production of heat-resistant and high-strength high-performance polyester or aramid resin.

As a method of manufacturing 4,4'-BDCA,
Several methods are conventionally known. For example, reacting 4-alkylbiphenyl with carbon monoxide under BF ₃ catalyst,
There is a method in which 4-alkyl-4'-formylbiphenyl is obtained and then oxidized with molecular oxygen to obtain 4,4'-BDCA. However, this method requires a highly corrosive BF ₃ catalyst in order to obtain the above-mentioned 4-alkyl-4′-formylbiphenyl, and also produces isomers other than the 4,4′-form, so that purification thereof is required. It has the drawback of being very complicated.

Further, 4,4'-diisopropylbiphenyl (hereinafter referred to as 4,4'-DIPB) is oxidized with molecular oxygen in the presence of a catalyst consisting of cobalt, manganese and bromine in an acetic acid solution to give 4 , 4'-BDCA is also available. However, this method yields 4,
There is a problem that the yield of 4'-BDCA is low, and a large amount of catalyst must be used to improve the yield.

[0005]

The main object of the present invention is to provide a method capable of producing 4,4'-BDCA with high yield and high purity.

[0006]

In view of the above problems of the prior art, the present inventor has conducted earnest studies, paying particular attention to the catalyst used for the oxidation of 4,4'-DIPB.
Then, as a result of trying the above oxidation under a certain condition using a specific catalyst containing a copper compound as an ordinary catalyst, unexpectedly, the yield and purity of 4,4′-BDCA can be significantly improved. The present invention has been completed and the present invention has been completed.

That is, the present invention provides the presence of (a) a cobalt compound and / or a manganese compound, (b) a copper compound, and (c) bromine or a compound thereof in a solvent containing an aliphatic monocarboxylic acid having 3 or less carbon atoms. The present invention relates to a method for producing 4,4'-biphenyldicarboxylic acid, which comprises oxidizing 4,4'-diisopropylbiphenyl or its oxidized derivative with molecular oxygen.

In the present invention, 4,4'-DIPB or its oxidized derivative (hereinafter, these are referred to as 4,4'-DIPB
Etc.) is used as a starting material. Such an oxidized derivative is a derivative which becomes 4,4'-BDCA when further oxidized, among the derivatives produced by the oxidation of 4,4'-DIPB. Specifically, as 4,4′-DIPB and the like, general formulas;

[0009]

[Chemical 1]

[Wherein A is -CHO, -CH (CH
_{3) 2, -C (CH 3} ) 2 (OOH), - C (CH 3)
₂ (OH) and -COCH shows a group selected from the group consisting of _3, wherein B is _{-CH (CH 3) 2, -C} (CH 3)
_{2 (OOH), - C (} CH 3) 2 (OH), - COCH
_A group selected from the group consisting of ₃ , -COOH and -CHO is shown. ] What is represented by can be used.

In the production method of the present invention, a cobalt compound and / or a manganese compound, and a copper compound (hereinafter referred to as "heavy metal catalyst") and bromine or a compound thereof (hereinafter referred to as "bromine-based catalyst") are used as catalysts. Used as.

The heavy metal catalyst is not particularly limited as long as it can be dissolved in the oxidizing solvent. Specifically, fatty acid salts, oxides of these metals,
Examples thereof include hydroxides, carbonates, halides, sulfates, nitrates, etc. Among them, fatty acid salts, particularly acetates are preferable.

The above-mentioned bromine-based catalyst may be any as long as it dissolves in an oxidizing solvent to generate bromine ions, and molecular bromine, hydrogen bromide, hydrobromic acid, or methyl bromide or ethyl bromide can be used. Alkyl bromide such as alkenyl bromide such as allyl bromide, aromatic bromide such as benzene bromide, alkali bromide, etc.
Examples thereof include inorganic salts such as ammonium bromide. Among these bromine-based catalysts, molecular bromine, ammonium bromide,
Sodium bromide, potassium bromide, lithium bromide, hydrogen bromide, hydrobromic acid and the like are preferable.

The solvent used in the present invention has 3 carbon atoms.
It is a solvent consisting of the following aliphatic monocarboxylic acids or containing 80% or more of aliphatic monocarboxylic acids having 3 or less carbon atoms. As the aliphatic monocarboxylic acid having 3 or less carbon atoms,
Examples are acetic acid, formic acid, propionic acid, etc., with acetic acid being most preferred. The solvent may contain water etc. up to 20%.

The method of the present invention is carried out by oxidizing a given raw material with molecular oxygen in a given solvent in the presence of the above given catalyst.

The concentration of the raw material 4,4'-DIPB or the like is about 0.005 to 0.5 mol, more preferably about 0.01 to 0.1 mol, per 100 g of the solvent. If the raw material concentration is too high, the amount of by-products produced increases,
The purity and yield of the 4,4'-BDCA produced are reduced.

The heavy metal catalyst is used in a total amount of 0.001 to 0.2 mol (as metal;
The same shall apply hereinafter), more preferably 0.005 to 0.1 mol. The ratio of the copper compound in the heavy metal catalyst is 1 × 10 ⁻⁵ per 100 g of the solvent used.
It is preferably about 0.005 mol. By adding a copper compound, the formation of by-products is suppressed,
The yield of'-BDCA can be significantly increased.
In addition, when the amount of the heavy metal catalyst used is too small, the amount of the by-produced by-products is increased to produce 4,4′-BDCA.
It is not preferable because the yield of the product decreases.

The amount of the bromine-based catalyst used is usually about 0.05 to 2.5 in terms of atomic ratio with respect to the total amount of the above heavy metal catalysts.
More preferably, it is within a range of about 0.1 to 2.0. When the amount of the bromine-based catalyst used is too small, the yield of the product 4,4′-BDCA decreases.

As the molecular oxygen, air, pure oxygen, a mixed gas obtained by diluting pure oxygen with an inert gas such as nitrogen, and the like are used, and air is most advantageous industrially. The higher the oxygen partial pressure, the faster the reaction proceeds, but in practice, it is 0.1 kg / cm ² · abs or more, preferably 0.2.
An oxygen partial pressure of about 8 kg / cm ² · abs is sufficient.

The reaction temperature is usually about 130 to 230 ° C, more preferably about 150 to 220 ° C. If the reaction temperature is too low, the reaction rate becomes slow and not practical, and if the reaction temperature is too high, the amount of by-products produced increases and the amount of solvent burned also increases.

[0021]

The production method of the present invention oxidizes 4,4'-DIPB and the like under a certain condition using a specific catalyst containing a copper compound, so that 4,4'-BDCA can be obtained in a high yield. It can be manufactured with high purity.

[0022]

EXAMPLES Examples and comparative examples will be shown below to further clarify the features of the present invention.

Example 1 A 500 cc titanium lining autoclave equipped with a reflux condenser, a gas blowing pipe, a discharge pipe and a stirrer was charged with the following materials, and the temperature was 180 ° C. and the pressure was 20 kg / cm ² · G.
Compressed air was circulated with vigorous stirring at 4, and the reaction was carried out for 4 hours.

4,4′-DIPB 7.15 g (30 mmol) Glacial acetic acid 200.0 g Cobalt acetate tetrahydrate 3.74 g (15 mmol) Manganese acetate tetrahydrate 3.68 g (15 mmol) Copper acetate monohydrate 0.10 g (0.5 mmol) potassium bromide 3.57 g (30 mmol) After completion of the reaction, the mixture was cooled to room temperature, the precipitate was filtered off, washed with acetic acid and water, and dried to obtain 6.80 g of crude crystals. Obtained.
When the obtained crude crystals were analyzed, it was confirmed to be 4,4′-BDCA with a purity of 97.6 wt%. 4,4 '
The yield of 4,4'-BDCA relative to -DIPB is 9
It was 1.3 mol%.

Examples 2 to 5 The procedure of Example 1 was repeated, except that the catalyst constitution was changed as shown in Table 1. The results are shown in Table 1.

[0026]

[Table 1]

Example 6 The procedure of Example 1 was repeated except that 200 g of propionic acid was used as the solvent. As a result, 6.82 g of crude crystals were obtained. Analysis of this crude crystal revealed a purity of 9
It was confirmed to be 6.8 wt% 4,4'-BDCA. The yield of 4,4′-BDCA based on 4,4′-DIPB was 90.9 mol%.

Example 7 7.15 g of 4,4'-diacetylbiphenyl as a raw material
It carried out like Example 1 except having used (30 mmol). As a result, 6.98 g of crude crystals were obtained. When this crude crystal was analyzed, it was confirmed to be 4,4′-BDCA with a purity of 99.2 wt%. 4,4 '
The yield of 4,4'-BDCA based on -diacetylbiphenyl was 95.3 mol%.

Comparative Example 1 The following materials were charged in the same autoclave as in Example 1 and the reaction was carried out under the same conditions as in Example 1 to obtain 6.67 g of crude crystals.

4,4′-DIPB 7.15 g (30 mmol) glacial acetic acid 200.0 g cobalt acetate tetrahydrate 3.74 g (15 mmol) manganese acetate tetrahydrate 3.68 g (15 mmol) potassium bromide 3.57 g (30 mmol) When the obtained crude crystal was analyzed, it was confirmed to be 4,4′-BDCA with a purity of 92.6 wt%. 4,4 '
The yield of 4,4'-BDCA relative to -DIPB is 8
It was 5.0 mol%.

Comparative Examples 2 to 5 The procedure of Comparative Example 1 was repeated except that the catalyst constitution was changed as shown in Table 2. The results are shown in Table 2.

[0032]

[Table 2]

Comparative Example 6 7.15 g of 4,4'-diacetylbiphenyl as a raw material
It carried out like Comparative Example 1 except having used (30 mmol). As a result, 6.79 g of crude crystals were obtained. Analysis of this crude crystal confirmed that it was 4,4′-BDCA with a purity of 98.6 wt%. 4,4 '
The yield of 4,4'-BDCA based on -diacetylbiphenyl was 92.1 mol%.

From the above results, the yield and purity of 4,4'-BDCA are improved in the present invention using a catalyst containing a copper compound, as compared with the case of using a catalyst containing no copper compound. I understand.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Nagano 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inoue Yosei, 4-Hirano-cho, Chuo-ku, Osaka No. 1 and 2 in Osaka Gas Co., Ltd.

Claims (1)

[Claims] 1. A solvent containing an aliphatic monocarboxylic acid having 3 or less carbon atoms in the presence of (a) a cobalt compound and / or a manganese compound, (b) a copper compound and (c) bromine or a compound thereof, A method for producing 4,4'-biphenyldicarboxylic acid, which comprises oxidizing 4,4'-diisopropylbiphenyl or an oxidized derivative thereof with molecular oxygen.