Supercharge Your Innovation With Domain-Expert AI Agents!

Process for production of polycarbonate resin

A technology of polycarbonate resin and preparation device, applied in the field of preparation of polycarbonate resin, can solve the problems not mentioned, etc., and achieve the effect of good mechanical properties

Active Publication Date: 2009-11-18
MITSUBISHI RAYON CO LTD
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in any of the above-mentioned prior art, there is no mention of the problem about the sudden appearance of the above-mentioned bad batches

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 production of polycarbonate resin
  • Process for production of polycarbonate resin
  • Process for production of polycarbonate resin

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] attached figure 1 and figure 2 Each is an explanatory diagram of an example of a production apparatus preferably used in the production method of the present invention. Among them, an example is given below for illustration. In this example, "BPA" is used as the dihydroxy compound, "sodium hydroxide" is used as the alkali metal compound, "dichloromethane" is used as the organic solvent, and "triethylamine" is used as the organic solvent. As a catalyst, "p-tert-butylphenol" is used as a chain terminator.

[0062] The sodium hydroxide aqueous solution of BPA, dichloromethane and liquefied phosgene supplied from the raw material supply pipe (1) pass through the oligomerization tanks (2a), (2b), and (2c) to form low carbonate with a viscosity average molecular weight of 5000 or less. Polymer. At this time, triethylamine and p-tert-butylphenol were added to the central oligomerization tank (2b) (supply piping is not shown). After the dichloromethane solution of the obta...

Embodiment 1

[0078] Using "BPA" as the dihydroxy compound, sodium hydroxide (NaOH) as the alkali metal compound, methylene chloride as the organic solvent, triethylamine (TEA) as the catalyst, and p-tert-butylphenol (pTBP) as the chain terminator, adopt The conditions shown in the table below, using the figure 2 The production apparatus shown continuously produces polycarbonate resin.

[0079] [Table 1]

[0080] BPA

kg / hr

16.0

NaOH

kg / hr

5.97

desalinated water

kg / hr

101.1

Phosgene

kg / hr

8.81

Dichloromethane

kg / hr

60.5

2% by weight TEA

kg / hr

0.27

24 wt% pTBP

kg / hr

1.90

Internal temperature of oligomerization tank (2a)

℃

45

Internal pressure of oligomerization tank (2a)

MPa-G

0.1

Internal temperature of oligomerization tank (2b) / (2c)

℃

30

Add 2% by weight of TEA to the oligomer storage tank (5)

kg / hr

...

Embodiment 2

[0086] In addition to making the exhaust pipe connected to the pickling step and the exhaust pipe connected to the water washing step in embodiment 1 independent of each other (such as image 3 Shown) except, adopt the method identical with embodiment 1 to prepare polycarbonate resin continuously. Same as Example 1, the chlorine atom content from the chloroformate group is below 1 weight ppm, no abnormal batches occur, and the product quality is stable. In addition, the measured value of the free chlorine content in the resin measured by ion chromatography was stable at 10 ppb. In addition, as in Example 1, as a result of observing whether or not roll contamination occurred during film formation to produce a sheet: no roll contamination occurred at all.

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

No PUM Login to View More

Abstract

The invention provides an interfacial process for continuous production of polycarbonate resin which is so improved as to give high-quality polycarbonate stably. In producing a polycarbonate resin continuously by interfacial polycondensation of an aqueous alkaline solution of a dihydroxyl compound with carbonyl chloride, a manufacturing plant is used which comprises as the essentials a raw material preparation tank, an oligomerization tank, a polycondensation tank, a washing tank, a resin isolation tank which are connected in series and provided respectively with vent lines, with at least two of the vent lines being independently connected to an exhaust gas treatment unit.

Description

technical field [0001] The invention relates to a method for preparing polycarbonate resin, in particular to a method for continuously preparing polycarbonate resin through an interface method. Background technique [0002] As a method for producing a polycarbonate resin, a method of interfacially polycondensing an aqueous alkali solution of a dihydroxy compound and phosgene using a halogenated hydrocarbon solvent is known as an interfacial method. In addition, in the method of continuous preparation using the interface method, a raw material preparation tank, an oligomerization tank, a polycondensation tank, a cleaning tank (pickling tank, water washing tank), and a resin separation tank are connected in series, and each tank is provided with A device with an exhaust pipe for exhausting solvent vapors and acid gases is used as a preparation device. [0003] The exhaust pipe is provided for the purpose of keeping the pressure inside the tank constant, and for appropriately ...

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
CPCC08G64/22C08G64/205
Inventor 高桥和幸兵藤和行内村竜次
Owner MITSUBISHI RAYON CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com