Separating system and separating method for residual monomers in polymer viscous liquid

A viscous liquid and residual monomer technology, applied in separation methods, chemical instruments and methods, evaporator accessories, etc., can solve the problems of high technical difficulty and high equipment cost, and achieve the effect of simple process, high thermal effect and cost reduction

Active Publication Date: 2015-01-07
周建明
View PDF8 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high equipment cost and high technical difficulty in the current monomer separation methods such as thin film evaporation, the present invention proposes a system and separation method for separating residual monomers in polymer viscous liquids, which solves the existing problems in the prior art. lack of

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
  • Separating system and separating method for residual monomers in polymer viscous liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Preparation of test samples

[0056] In the reactor, 100 kg of crude modified HDI biuret that had been prepolymerized was sampled, and the residual HDI monomer content was detected to be 12.4 wt%.

[0057] 2) Use the separation device of the present invention to remove the residual HDI monomer in the modified HDI biuret

[0058] a. Use a vacuum pump to evacuate the system, and the vacuum degree is 0.070-0.085Mpa; after the air is purified by the dryer, it enters the gas heater and is heated to 130°C.

[0059] b. Maintain the normal operation of the agitator in the reaction kettle, pass the heated air into the gas dispersion pipe at the bottom of the reaction kettle, and enter the kettle through multiple small holes on the gas dispersion pipe, so that the HDI biuret viscous liquid bubbles and evaporates Out of residual HDI monomer.

[0060] c. The gas with residual HDI monomer is pumped to the top of the reactor under vacuum suction, enters the condenser connected t...

Embodiment 2

[0063] 1) Preparation of test samples

[0064] In the reactor, 100kg of crude HDI trimer that had been prepolymerized was sampled, and the residual HDI monomer content was detected to be 19.3wt%.

[0065] 2) Use the separation device of the present invention to remove the residual HDI monomer in the HDI trimer

[0066] a. Use a vacuum pump to evacuate the system, and the vacuum degree is 0.070-0.085Mpa; after the air is purified by the dryer, it enters the gas heater and is heated to 120°C.

[0067] b. Maintain the normal operation of the agitator in the reaction kettle, pass the heated air into the gas dispersion pipe at the bottom of the reaction kettle, enter the kettle through multiple small holes on the gas dispersion pipe, and make the HDI trimer viscous liquid bubble, Residual HDI monomer was evaporated.

[0068] c. The gas with residual HDI monomer is pumped to the top of the reactor under vacuum suction, enters the condenser connected to the reactor, separates the H...

Embodiment 3

[0071] 1) Preparation of test samples

[0072] In the reactor, 100 kg of the crude product of the prepolymerized TDI prepolymer was sampled, and the residual TDI monomer content was detected to be 8.3 wt%.

[0073] 2) Use the separation device of the present invention to remove residual TDI monomer in the TDI prepolymer

[0074] a. Use a vacuum pump to evacuate the system, and the vacuum degree is 0.070-0.085Mpa; after the air is purified by the dryer, it enters the gas heater and is heated to 120°C.

[0075] b. Maintain the normal operation of the agitator in the reaction kettle, pass the heated air into the gas dispersion pipe at the bottom of the reaction kettle, enter the kettle through multiple small holes on the gas dispersion pipe, and make the TDI prepolymer viscous liquid bubble, Residual TDI monomer was evaporated.

[0076] c. The gas with residual TDI monomer is pumped to the top of the reactor under vacuum suction, enters the condenser connected to the reactor, 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

No PUM Login to view more

Abstract

The invention discloses a separating system and a separating method for residual monometers in a polymer viscous liquid. The separating system comprises a gas supply device, a gas heating device, a separating device and a vacuumizing device, wherein the separating device comprises a reactor/a material filling tank, a condenser and a storage tank, wherein the reactor/the material filling tank is provided with a stirrer, and a gas dispersing pipe is mounted at the bottom of the reactor/the material filling tank. Gas provided by the gas supply device enters the gas dispersing pipe which is mounted at the bottom of the reactor/the material filling tank after passing through a gas heating device; the gas is blown to the polymer viscous liquid through the gas dispersing pipe, so that the viscous liquid is bubbled and the residual monomers are evaporated; evaporated residual monomers and the gas enter the condenser together under the action of vacuum, the residual monomers and the gas are separated by condensing; the residual monomers enter the storage tank and are stored in the storage tank. According to the separating system and the separating method, equipment is simple; process parameters are easy to control; the energy consumption is low; the processing amount is large. The separating system and the separating method can be used for separating the residual monomers from the polymer viscous liquid.

Description

technical field [0001] The invention relates to the separation technology of residual monomer in polymer viscous liquid. Background technique [0002] In the fine chemical industry, it is often necessary to separate the solvent molecules and residual monomer molecules in the polymer viscous liquid, usually by solvent extraction and vacuum distillation, but for some heat-sensitive polymers with high viscosity, high molecular weight and high boiling point However, such conventional methods cannot separate the residual monomers in such polymers well. Now the international method for separating residual monomers in such polymers is thin film evaporation. [0003] The thin-film evaporation method is to scrape the processed prepolymer into a thin film from the rotating scraper on the upper part of the evaporator to slowly flow down. The heating time of the material is shortened to a few minutes, the evaporation area is large, and the residual monomer evaporates quickly. However, ...

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): B01D1/14B01D1/30
CPCB01D1/14B01D1/30
Inventor 周建明李本林何绍群
Owner 周建明
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap