Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for separating and purifying polycarbonate glue solution

A polycarbonate, separation and purification technology, applied in the chemical industry, can solve the problems of material waste, material loss, and many dynamic equipment, and achieve the effects of saving material use, simplifying operations, and reducing losses

Inactive Publication Date: 2012-07-25
甘肃银光聚银化工有限公司 +1
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN1461322A describes the method of using a tray decanter and a coalescer decanter in series, and then connecting a centrifuge to separate and purify the product after interfacial polycondensation, wherein at least one tray decanter or coalescer decanter is used , Three centrifuges, the polycarbonate resin glue contained in the separated water phase cannot be further processed, wasting materials, increasing the difficulty of wastewater treatment, decanting with a tray decanter or coalescer The device only reflects the function of separation, but fails to wash and purify the material, and does not further process the centrifuge coolant mixed with polycarbonate resin
[0006] Chinese patent CN1324375A describes the separation and washing method of a combination of a coalescing separator and a centrifuge or a full coalescing separator. In the separation and washing method of a combination of a coalescing separator and a centrifuge, a phase separation device, a coalescence Separator, one pump, three centrifuges, more dynamic equipment, which increases the difficulty of maintenance and the separated water phase is directly discharged without secondary separation, resulting in material loss
In the combination method of phase separation equipment and coalescence separator, at least 5 coalescence separators need to be used, and the separated materials all enter the previous separator, the separation efficiency is low, and it is difficult to guarantee the effect of washing and purification
[0007] Chinese patent CN1648153A also describes a separation and washing process combining static separation and coalescence separation, but because there is no high-efficiency mixing equipment, the material cannot be fully mixed with the washing liquid, and the washing and purification effect is poor. Ester glue, and no secondary extraction and separation, resulting in product loss

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
  • Method for separating and purifying polycarbonate glue solution
  • Method for separating and purifying polycarbonate glue solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The product prepared by the phosgene interfacial polycondensation method, wherein the polycarbonate weight average molecular weight is 30000, the molecular weight distribution is 2.01, the organic phase composed of dichloromethane and polycarbonate accounts for about 62% of the total volume, and the polycarbonate in the organic phase The content of polycarbonate is 14%, and sodium chloride content is 15.5% in the aqueous phase, and sodium carbonate content is 2%, and the step of separation and purification polycarbonate glue solution is as follows, see figure 1 :

[0033] a. The above-mentioned product, material 1, is continuously pumped to the inclined plate separator F1 for the first precipitation separation, the temperature is controlled at 10-20°C, the flow rate is controlled at 2000kg / h, and the inlet pressure of the inclined plate separator F1 is 0.2Mpa, the residence time is 10-20 minutes, and the organic phase 2 and the water phase 3 are separated by precipitatio...

Embodiment 2

[0046] The product prepared by the phosgene interfacial polycondensation method, wherein the polycarbonate weight average molecular weight is 100000, the molecular weight distribution is 2.06, the organic phase composed of dichloromethane and polycarbonate accounts for about 60% of the total volume, and the polycarbonate in the organic phase The content of polycarbonate is 10%, and sodium chloride content is 14% in the aqueous phase, and sodium carbonate content is 1.5%, and the step of separation and purification polycarbonate glue solution is as follows, see figure 1 :

[0047] a. The above-mentioned product, namely material 1, is continuously pumped to the inclined plate separator F1 for the first precipitation separation, the temperature is controlled at 20-30°C, the flow rate is controlled at 1500kg / h, and the inlet pressure of the inclined plate separator F1 is 0.2Mpa, the residence time is 20-40 minutes, and the organic phase 2 and the water phase 3 are separated by pre...

Embodiment 3

[0058] Example 3, see figure 1 :

[0059] The present invention can not only separate and purify the product after interfacial polycondensation of phosgene, but also can separate the mixed liquid composed of polycarbonate, dichloromethane and process water. This mixed liquid is generally formed during the production process when waste materials are processed. This mixture works better.

[0060] Fully mix the polycarbonate glue with a weight average molecular weight of 15000, a molecular weight distribution of 2.1, and a resin concentration of 20% with process water, wherein the volume ratio of the aqueous phase to the organic phase is 0.6. After mixing fully, the polycarbonate The water content in the glue is 2%, and the triethylamine content is 0.06%. The mixed solution is delivered to the inclined plate separator F1 by a pump at a flow rate of 3000kg / h, and then enters the process flow described in the present invention successively. The processing water flow rate of the s...

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
molecular weight distributionaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for separating and purifying polycarbonate glue solution. By means of an efficient separation washing and purifying process of using two oblique plate separators, two centrifugal machines and a fiber bed coalescence separator, the method is quick and efficient in separation washing and effective, and aqueous phase separated from the centrifugal machines is further treated to simplify operations of the centrifugal machines. The aqueous phase discharged from the centrifugal machines and the oblique plate separators are mixed with cooling liquid of the centrifugal machines to extract the polycarbonate glue solution and then re-separated through the fiber bed coalescence separator to minimize organic phase loss, and accordingly loss of the polycarbonate glue solution is reduced. Further, the aqueous phase separated from the fiber bed coalescence separator can directly enter a waste water treatment system, so that difficulty in waste water treatment is lowered.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for separating and purifying polycarbonate glue. Background technique [0002] At present, the production of polycarbonate mainly includes phosgene interfacial polycondensation method and melt transesterification method, among which phosgene interfacial polycondensation method is currently the most widely used preparation method. The phosgene interface polycondensation reaction is simple, but the post-treatment is more complicated. The product after the reaction must be separated and purified, and the solvent can be removed to obtain the final product. The quality of the separation and purification effect is directly related to the quality of the polycarbonate product. [0003] After the phosgene interface polycondensation reaction is completed, the product exists in two phases, an organic phase and an aqueous phase. There are impurities such as sodium chloride, sodium c...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/40C08G64/24
Inventor 郧栋程华农付振波郑世清马建军谭心舜
Owner 甘肃银光聚银化工有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products