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Polymerization inhibitor for acrylic acid monomer refining

A technology of acrylic monomer and polymerization inhibitor, which is applied in the field of polymerization inhibitor for improving the continuous production cycle of acrylic monomer refining tower, can solve the problems of inability to effectively prevent polymers and block pipelines, and achieves improved continuous operation time and stable operation. , Improve the effect of continuous production cycle

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical solution of the present invention is to overcome the inadequacies in the prior art that cannot effectively prevent polymers from clogging equipment such as pipelines, trays, and pump bodies when refining acrylic acid monomers, and proposes a method for acrylic acid monomers. Refined polymerization inhibitor, by modifying the polymerization inhibitor, the polymerization inhibitor is adjusted from hydroquinone to hydroquinone, chlorpromazine and promethazine

Method used

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  • Polymerization inhibitor for acrylic acid monomer refining
  • Polymerization inhibitor for acrylic acid monomer refining
  • Polymerization inhibitor for acrylic acid monomer refining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Preparation of inhibitors:

[0068] The mass proportioning of each component of polymerization inhibitor is as follows:

[0069] Hydroquinone: 94%;

[0070] Chlorpromazine: 4.5%;

[0071] Promethazine: 1.5%.

[0072] Mix hydroquinone, chlorpromazine and promethazine in the above ratio at normal temperature;

[0073] After mixing evenly, add it to the polymerization inhibitor tank configuration kettle, add the solvent toluene, stir and dissolve with a mixer;

[0074] Then the mixer is stopped, and the polymerization inhibitor configured is left in the polymerization inhibitor tank for use.

[0075] The reaction temperature of the rectification column and tower kettle is 87°C, the absolute pressure is 0.018MPa, under the condition that the mass ratio of crude acrylic acid and polymerization inhibitor is 1000:1, on the basis of re-starting the device after maintenance, the above-mentioned polymerization inhibitor is used For 100 days of continuous operation of the acr...

Embodiment 2

[0082] Preparation of inhibitors:

[0083] The mass proportioning of each component of polymerization inhibitor is as follows:

[0084] Hydroquinone: 94%;

[0085] Chlorpromazine: 4.5%;

[0086] Promethazine: 1.5%.

[0087] Mix hydroquinone, chlorpromazine and promethazine in the above ratio at normal temperature;

[0088] After mixing evenly, add it to the polymerization inhibitor tank configuration kettle, add the solvent toluene, stir and dissolve with a mixer;

[0089] Then the mixer is stopped, and the polymerization inhibitor configured is left in the polymerization inhibitor tank for use.

[0090] The reaction temperature of the rectification column and tower kettle is 87°C, the absolute pressure is 0.018MPa, under the condition that the mass ratio of crude acrylic acid and polymerization inhibitor is 1000:1, on the basis of re-starting the device after maintenance, the above-mentioned polymerization inhibitor is used For 100 days of continuous operation of the acr...

Embodiment 3

[0098] Preparation of inhibitors:

[0099] The mass proportioning of each component of polymerization inhibitor is as follows:

[0100] Hydroquinone: 95%;

[0101] Chlorpromazine: 4.0%;

[0102] Promethazine: 1.0%.

[0103] Mix hydroquinone, chlorpromazine and promethazine in the above ratio at normal temperature;

[0104] After mixing evenly, add it to the polymerization inhibitor tank configuration kettle, add the solvent toluene, stir and dissolve with a mixer;

[0105] Then the mixer is stopped, and the polymerization inhibitor configured is left in the polymerization inhibitor tank for use.

[0106] The reaction temperature of the rectification column and tower kettle is 85°C, and the absolute pressure is 0.015MPa. Under the condition that the mass ratio of crude acrylic acid and polymerization inhibitor is 1200:1, the above-mentioned polymerization inhibitor is used on the basis of re-starting the device after maintenance. For 100 days of continuous operation of the...

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Abstract

The invention belongs to the technical field of organic synthesis and provides a polymerization inhibitor for acrylic acid monomer refining. The polymerization inhibitor comprises, by mass, 94-95% of hydroquinone, 4.0-5.0% of chlorpromazine and 1.0-2.0% of promethazine. Through use of two common chemical products in the original polymerization inhibitor, the modified polymerization inhibitor does not need change of original reaction conditions of the production device. The novel polymerization inhibitor can be prepared through simple and easy processes. The modified polymerization inhibitor can substantially prolong a rectifying tower continuous production period to 200 days in acrylic acid monomer production.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and relates to a polymerization inhibitor used for refining acrylic acid monomers, in particular to a polymerization inhibitor for improving the continuous production cycle of acrylic acid monomer refining towers. Background technique [0002] Since acrylic acid is a vinyl monomer that is very easy to polymerize, its polymerization phenomenon is common in the industrial production process. These polymers block equipment such as pipes, trays, pump bodies, etc., which often have a serious impact on the operation of processes and devices. In order to avoid such a phenomenon, in the acrylic acid production industry, hydroquinone, a polymerization inhibitor, is widely used. The polymerization inhibition mechanism of hydroquinone is that the benzoquinone generated by oxidation can inhibit the polymerization of acrylic acid. [0003] At present, the production of most acrylic acid monomers is ...

Claims

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Application Information

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IPC IPC(8): C07C51/50C07C57/075
Inventor 方键金冬梅姜迎春程延华刘宇于鸿涛张庆民
Owner PETROCHINA CO LTD
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