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
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  • 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

Method used

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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

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PUM

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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

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Application Information

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IPC IPC(8): C07C7/20C07C15/46
Inventor 姜文凤王慧龙
Owner DALIAN UNIV OF TECH
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