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Diaryl carbonate and method for producing the same, and method for producing an aromatic polycarbonate resin

a technology of diaryl carbonate and aromatic polycarbonate, which is applied in the direction of carbonic/haloformic acid esters purification/separation, separation processes, organic chemistry, etc., can solve the problems of large amount of alkali, apparatus used in the production to suffer corrosion, and the time of polymerization can be reduced

Inactive Publication Date: 2018-10-11
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method for producing aromatic polycarbonate by melt transesterification. By using a diaryl carbonate containing a specific compound in a low amount, the polymerization time can be reduced compared to conventional methods. This results in a more efficient production process.

Problems solved by technology

However, the production of a diaryl carbonate using phosgene is disadvantageous not only in that phosgene is highly toxic and highly likely to cause the apparatuses used in the production to suffer corrosion, but also in that a great amount of an alkali is required for neutralizing hydrogen chloride by-produced during the reaction.

Method used

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  • Diaryl carbonate and method for producing the same, and method for producing an aromatic polycarbonate resin
  • Diaryl carbonate and method for producing the same, and method for producing an aromatic polycarbonate resin
  • Diaryl carbonate and method for producing the same, and method for producing an aromatic polycarbonate resin

Examples

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examples

[0104]Hereinbelow, the present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention.

[0105](Measurement of a BOD Concentration)

[0106]Each of the samples (BOD-containing DPC) obtained in Examples 1 to 10 was dissolved in acetone, and heptylbenzene as an internal standard material was added to the resultant solution, and subjected to quantitative determination by means of a gas chromatography analysis apparatus under the below-shown conditions for measurement. Substantially the same procedure as mentioned above was repeated to prepare sample solutions having respective known concentrations, and a calibration curve was prepared using the prepared solutions, and used in an analysis for a BOD concentration in DPC.

[0107]Measuring apparatus: Shimadzu GC-2014

Detector: FID

[0108]Column: GL Sciences Inc. TC-17 (0.30 m×0.25 mm I.D.),

Column temperature: 70° C. (5 min)−12° C. / min−190° C. (5...

examples 7 to 30

[0123]The distillation step in each Example was performed until the compound of the formula (I) in the liquid in the vessel was built up in such a concentration that the compound was precipitated when the temperature at the bottom of the column was reduced to 188.5° C. or lower. The resultant liquid in the vessel was withdrawn and then cooled so that the compound of the formula (I) was precipitated, followed by filtration under reduced pressure using No. 5C filter paper having a diameter of 330 mm, manufactured by Advantech Toyo Kaisha, Ltd., recovering a filtrate. The concentrations of the compound of the formula (I) and the precipitation conditions in the respective procedures are shown in Table 2. The solubility of BOD in DPC was measured and found to be as shown in FIG. 1.

TABLE 2Example789101112131415161718Example for distillation step123456123456BOD Concentra-GCwt %25.925.524.823.322.621.425.925.524.823.322.621.4tion in columnCompo-bottom DPCsitionPrecipitation° C.8282828282821...

example 31

[0124]The catalyst separation step and BPC recovery step in the purification step were performed in accordance with the same procedure as in Example 2. Then, the filtrate obtained in the precipitation step in Example 20 was added to the mixture obtained from the bottom of the BPC separation column in the BPC recovery step, and the resultant mixture was subjected to the distillation step in accordance with the same procedure as in Example 2. The BOD concentration (GC composition) of the obtained column top DPC was equivalent to the BOD concentration (GC composition) in Example 2 which includes no recycling.

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Abstract

A diaryl carbonate containing a compound of the following formula (I) in an amount of less than 1,000 ppm by mass, and a method for producing the same:wherein R1 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a diaryl carbonate and a method for producing the same. In addition, the present invention relates to a method for producing an aromatic polycarbonate resin by a melt transesterification method using the diaryl carbonate.BACKGROUND ART[0002]A diaryl carbonate is a compound which is advantageously used as a raw material for a polycarbonate produced by a melt transesterification method, and has conventionally been produced by a reaction of an aromatic hydroxy compound and phosgene. However, the production of a diaryl carbonate using phosgene is disadvantageous not only in that phosgene is highly toxic and highly likely to cause the apparatuses used in the production to suffer corrosion, but also in that a great amount of an alkali is required for neutralizing hydrogen chloride by-produced during the reaction. Therefore, a method for producing a diaryl carbonate without using phosgene is desired, and some attempts to develop ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D265/26B01D3/42B01D9/00
CPCC07D265/26B01D3/4211B01D9/0031C07C68/08C07C69/96C07B61/00C08G64/04C08G64/30C07C68/00C07C68/06
Inventor HARADA, HIDEFUMITAGUCHI, JUNGOISAHAYA, YOSHINORI
Owner MITSUBISHI GAS CHEM CO INC
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