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Industrial process for producing aromatic carbonate

A carbonate and aromatic technology, applied in the field of industrial preparation of aromatic carbonates, can solve the problems of undisclosed mass production, undocumented suggestions and the like

Active Publication Date: 2007-06-20
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in all the existing documents proposing the preparation of aromatic carbonates by these reactive distillation methods, there is no specific method or device that can be mass-produced on an industrial scale (for example, more than 1 ton per hour), and there is no description advice on them

Method used

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  • Industrial process for producing aromatic carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0144]

[0145] Use L=3100cm, D=500cm, L / D=6.2, n=30, D / d as shown in Figure 1 1 =3.85, D / d 2 =11.1 continuous multistage distillation column. In addition, in this embodiment, two Mellapaks (メラパツク) (the total number of theoretical stages is 11) are provided in the upper part as internal parts, and the cross-sectional area of ​​each hole = about 1.3 cm is used in the lower part 2 , the number of holes = about 250 / m 2 perforated trays.

[0146]

[0147] A mixture containing 18% by mass of methyl phenyl carbonate obtained by transesterification using a mixture composed of dimethyl carbonate / phenol=1.3 (mass ratio) was used as a raw material. This raw material contains 26% by mass of dimethyl carbonate, 6% by mass of anisole, 48% by mass of phenol and 1% by mass of diphenyl carbonate, and further contains about 100ppm of catalyst Pb(OPh) 2 . This raw material is substantially halogen-free (less than 1 ppb outside the detection limit of ion chromatography).

[0148] Fro...

Embodiment 2

[0151] Using the same continuous multistage distillation column as in Example 1, reactive distillation was carried out under the following conditions.

[0152]

[0153] A mixture containing 21% by mass of methyl phenyl carbonate obtained by transesterification using a mixture composed of dimethyl carbonate / phenol=1.9 (mass ratio) was used as a raw material. This raw material contains 32% by mass of dimethyl carbonate, 5% by mass of anisole, 41% by mass of phenol and 1% by mass of diphenyl carbonate, and further contains about 250ppm of catalyst Pb(OPh) 2 . This raw material is substantially halogen-free (less than 1 ppb outside the detection limit of ion chromatography).

[0154] From the raw material inlet provided between the Mellapak and the perforated tray, the raw material was introduced into the above-mentioned continuous multistage distillation column at a flow rate of 80 ton / hr. The temperature at the bottom of the tower is 205°C, and the pressure at the top of the...

Embodiment 3

[0157] Use the cross-sectional area of ​​each hole of the perforated tray = about 1.8cm 2 The same continuous multistage distillation column as in Example 1, and carried out reactive distillation under the following conditions.

[0158]

[0159]A mixture containing 16% by mass of methyl phenyl carbonate obtained by transesterification using a mixture composed of dimethyl carbonate / phenol=1.4 (mass ratio) was used as a raw material. This raw material contains 27% by mass of dimethyl carbonate, 7% by mass of anisole, 49% by mass of phenol and 0.5% by mass of diphenyl carbonate, and further contains about 200ppm of catalyst Pb(OPh) 2 . This raw material is substantially halogen-free (less than 1 ppb outside the detection limit of ion chromatography).

[0160] From the raw material inlet provided between the Mellapak and the perforated tray, the raw material was introduced into the above-mentioned continuous multistage distillation column at a flow rate of 94 ton / hr. The temp...

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Abstract

It is an object of the present invention to provide, for the case of continuously producing aromatic carbonates containing a diaryl carbonate as a main product by taking an alkyl aryl carbonate containing specific amounts of a dialkyl carbonate and an aromatic monohydroxy compound as a starting material, in which said alkyl aryl carbonate is obtainable through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound, using a continuous multi-stage distillation column in which a catalyst is present, and continuously feeding the starting material into the continuous multi-stage distillation column, a specific process that enables the diaryl carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of not less than 1 ton per hour. Although there have been various proposals regarding processes for the production of aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specified continuous multi-stage distillation column, and there is also provided a specific process that enables a diaryl carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of not less than 1 ton per hour from an alkyl aryl carbonate containing specific amounts of the dialkyl carbonate and the aromatic monohydroxy compound.

Description

technical field [0001] The invention relates to an industrial preparation method of aromatic carbonates. More particularly, the present invention relates to starting from alkyl aryl carbonate obtained by the transesterification reaction of dialkyl carbonate and aromatic monohydroxy compound, converting the feed to A method for industrially producing a large amount of aromatic carbonates that can be used as a raw material for transesterification polycarbonate with diaryl carbonate as the main product of aromatic carbonates. Background technique [0002] Aromatic carbonates are important raw materials for the preparation of aromatic polycarbonates, which are many engineering plastics most in demand, without the use of toxic phosgene. As a method for producing aromatic carbonates, a method of reacting an aromatic monohydroxy compound with phosgene has been known, and various studies have been conducted recently. However, this method has the problem of using phosgene, and ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06C07C68/08B01D3/00C07B61/00C07C69/96
CPCB01D3/146C07C68/08C07C68/06Y02P20/10C07C69/96
Inventor 福冈伸典八谷广志松崎一彦
Owner ASAHI KASEI KK