Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for continuous production of polycarbonate oligomer

A polycarbonate and oligomer technology, applied in the field of continuous manufacturing of polycarbonate oligomers

Inactive Publication Date: 2009-01-28
TEIJIN KASEK KK
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the method of liquefied phosgene, a certain amount of highly toxic phosgene must be stored in the process.
In addition, the method must have a device for cooling and liquefying phosgene

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for continuous production of polycarbonate oligomer
  • Process for continuous production of polycarbonate oligomer
  • Process for continuous production of polycarbonate oligomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] (manufacture of phosgene)

[0124] use figure 1 The phosgene manufacturing process shown. The reaction tower (d) is a casing type reaction tower. Fill the side of the tube with 50kg of coconut shell activated carbon, the filling density is 0.430g / ml, and the specific surface area is 1300m 2 / g, the pore volume is 0.98ml / g, the particle density is 0.69g / ml, and the average pore diameter is 17.0nm. Pass cold water at 20°C on the shell side to remove the heat of reaction.

[0125] Upstream of the reaction column (d), a mixer (c) is provided. The raw materials were supplied to the mixer (c) through the carbon monoxide supply pipe (a) and the chlorine gas supply pipe (b).

[0126] Downstream of the reaction tower (d), basically a gas flow meter (e), a gas take-off pipe (f), a cooler (h) for circulating -25°C brine, a liquefied phosgene storage tank (i), and a quantitative Pump (j), vaporizer (k) for gasification of liquefied phosgene, phosgene take-off pipe (l).

[01...

Embodiment 2

[0147] It implemented by the method similar to Example 1 except having changed the return of a part of the cooled solution to via the piping (9-1) instead of via the piping (9-3). At this time, the Reynolds number of the fluid in the mixing reactor (4) was 36,000. Table 1 shows the evaluation results of the obtained oligomers and polymers.

Embodiment 3

[0149] The same method as in Example 1 was carried out except that the mixing reactor (4) was changed to a static tubular reactor (SMpac, manufactured by Noritake Campanil). At this time, the Reynolds number of the fluid in the mixing reactor (4) was about 24,000. Table 1 shows the evaluation results of the obtained oligomers and polymers.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Filling densityaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Pore volumeaaaaaaaaaa
Login to View More

Abstract

The object is to provide a process for continuously producing a polycarbonate oligomer in a simple facility, at low cost, and with good productivity. Disclosed is a process for continuously producing a polycarbonate oligomer by reacting an aqueous alkaline solution (ii) of a dihydric phenol compound with a phosgene gas (iii) in the presence of an organic solvent (i). The process comprises the steps of: (1) reacting chlorine with carbon monooxide at a molar ratio of 1:1.01-1.3 to yield a phosgene gas (iii) having a carbon monooxide content of 1-30% by volume; (2) reacting an organic solvent (i), an aqueous alkaline solution (ii) of a dihydric phenol compound and the phosgene gas (iii) continuously to yield an initial-stage product having a gas / liquid mixed phase; (3) cooling the initial-stage product to 2-25 DEG C; and (4) subjecting the initial-stage product to gas / liquid separation to yield a product solution containing a polycarbonate oligomer.

Description

technical field [0001] The present invention relates to a continuous production method of a polycarbonate oligomer and a production method of a high-quality polycarbonate resin using the polycarbonate oligomer as a raw material. Background technique [0002] As a manufacturing method of a polycarbonate oligomer, the manufacturing method of making the alkaline aqueous solution of a dihydric phenol compound, and phosgene react in presence of an organic solvent is known. With this method, since the reaction proceeds violently, care must be taken to remove the heat of reaction and prevent localized heating, and various improvements have been made regarding these. [0003] For example, Patent Document 1 proposes a method of continuously producing a polycarbonate resin by reacting a liquid aqueous phase, a liquid organic phase, and a phosgene-containing gas phase in a reactor having a packed column. The method is characterized in that the heat of reaction is removed by using a la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G64/22
CPCC08G64/24C08G64/04C08G64/20C08G64/22C08G64/36
Inventor 栋田宽之金行伸一郎中川秀则真锅昭良
Owner TEIJIN KASEK KK