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

High efficiency composite polymerization inhibitor for refining styrene and its application

A polymerization inhibitor and composite technology, which is applied in the field of composite polymerization inhibitors in the styrene distillation process, can solve the problems of high prices of piperidine derivatives, increased energy consumption, and increased production costs of styrene

Inactive Publication Date: 2007-06-06
DALIAN UNIV OF TECH
View PDF4 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of the piperidine derivatives used in these two composite inhibitors is high, and the liquid phase inhibition effect is poor at high temperatures. energy consumption
Chinese patent CN1392127A introduces a composite type polymerization inhibitor containing nitroxide free radicals and nitrophenol compounds, which can effectively prevent the polymerization of vinyl aromatic compounds such as styrene during distillation or purification, but in this The content of high-priced nitrogen oxide radicals in the product is large, resulting in an increase in the production cost of styrene

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0013] Add the weighed compound inhibitor of the present invention and styrene into a three-neck flask with a reflux condenser, a thermometer is installed on one side to measure the temperature, the other side is a sampling port, and the middle port is connected to a reflux condenser. After the system was replaced with nitrogen for 5 minutes, the three-neck flask was placed in an oil bath at 120° C. for 2 hours of constant temperature reaction, and samples were taken to analyze the content of polystyrene in styrene. The experimental results are shown in Table 1.

[0014] Example

Embodiment 10～13

[0016] Add the weighed compound inhibitor of the present invention and styrene into a three-neck flask with a reflux condenser, a thermometer is installed on one side to measure the temperature, the other side is a sampling port, and the middle port is connected to a reflux condenser. After the system was replaced with nitrogen for 5 minutes, the three-neck flask was placed in an oil bath at 120C for 2 hours of constant temperature reaction, and samples were taken at different times to analyze the content of polystyrene in styrene. The experimental results are shown in Table 1. The polymerization inhibitor used is compounded by CPPDA / PTZ+TMHPO· / DNBP according to 30 / 70 / 300 (ppm / ppm / ppm).

[0017] Example

Embodiment 14～18

[0019] Add the weighed compound inhibitor of the present invention and styrene into a three-neck flask with a reflux condenser, a thermometer is installed on one side to measure the temperature, the other side is a sampling port, and the middle port is connected to a reflux condenser. After the system was replaced with nitrogen for 5 minutes, the three-neck flask was placed in oil baths of different temperatures for constant temperature reaction for 2 hours, and samples were taken to analyze the content of polystyrene in styrene. The experimental results are shown in Table 3. The polymerization inhibitor used is compounded by CPPDA / PTZ+TMHPO· / DNBP according to 30 / 70 / 300 (ppm / ppm / ppm).

[0020] Example

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 present invention relates to one kind of high efficiency composite polymerization inhibitor for refining styrene. The composite polymerization inhibitor is re-compounded with aromatic amine compound, nitrogen-oxygen free radical or phenothiazine, and nitrophenol compound in certain proportion, and through dissolving in organic solvent. The composite polymerization inhibitor has the synergistic effect of the polymerization retarder and polymerization inhibitor, obviously polymerization inhibiting effect higher than single polymerization inhibitor, lowered toxicity and raised solubility, and can meet the requirement for styrene rectifier to run stably for long term.

Description

technical field [0001] The invention relates to a high-efficiency composite polymerization inhibitor for styrene and its application, in particular to a composite polymerization inhibitor used in the rectification process of styrene. Background technique [0002] Styrene is the basic product of the petrochemical industry and an unsaturated aromatic hydrocarbon monomer with a wide range of uses. It is mainly used in the production of polystyrene, ABS, SAN, ion exchange resins, unsaturated polyester resins, and styrene-butadiene rubber. In addition, it can also be used in Synthetic coatings, dyes, pesticides, medicine and mineral processing industries. [0003] Styrene has the properties of vinyl olefin and is extremely reactive, and it can undergo slow thermally activated self-polymerization at ambient temperature. The higher the temperature, the faster the polymerization rate, and it is easier to polymerize due to the high temperature in the styrene rectification process. ...

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): C07C7/20C07C15/46
Inventor 姜文凤王慧龙
Owner DALIAN UNIV OF TECH
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

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com