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Method for preventing polymerization of aromatic olefin monomers in storage process

A technology for aromatic olefins and monomers, which is used in the field of preventing polymerization of styrene monomers during storage. It can solve the problems of no reported changes in the adhesion of polymerization inhibitor coatings, coating brushing methods, etc., and prolong the period of cleaning tanks for maintenance. , solve the aggregation phenomenon, and improve the effect of compatibility

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document does not report the adhesion change of the coating after the addition of the polymerization inhibitor, the coating method of the coating, and the specific method of controlling the release rate of the polymerization inhibitor, and the laboratory investigation period is only 5 months

Method used

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  • Method for preventing polymerization of aromatic olefin monomers in storage process
  • Method for preventing polymerization of aromatic olefin monomers in storage process
  • Method for preventing polymerization of aromatic olefin monomers in storage process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0026] On the standard tinplate (50×100×0.2~0.3mm), use three-layer overcoating, double-layer overcoating, and single-layer painting respectively to paint epoxy resin paint. The amount of polymerization inhibitor TBC accounts for the amount of paint 4% (mass, the same below), wherein the thickness of the bottom layer is about 40 μm, the middle layer is about 80 μm, and the surface layer is about 100 μm. After the coating was dry, the adhesion was tested, and then the coated panel was placed in a 5L styrene storage tank and soaked at 30°C for 3 months. The results are shown in Table 1.

[0027] Table 1 Variation of coating adhesion with different brushing methods

[0028] Example

[0029] It can be seen from Table 1 that the three-layer overcoating method improves the compatibility between the polymerization inhibitor and the coating, and the adhesion is significantly better than the single-layer and double-layer coating methods.

Embodiment 4～9

[0031] On the tinplate plates described in Examples 1 to 3, different paints and brushing methods were used to paint, and the amount of polymerization inhibitor TBC accounted for 2% of the paint amount. The changes in coating adhesion are shown in Table 2.

[0032] Table 2 Variation of adhesion of different coatings

[0033]

[0034] It can be seen from Table 2 that no matter what kind of paint, after adding the polymerization inhibitor, the suitable brushing method is three-layer overcoating. After the above-mentioned coated panels were soaked in styrene for a period of time, the coatings of Examples 5, 7, and 9 were intact without peeling; the coatings of Examples 4, 6, and 9 all fell off in varying degrees.

Embodiment 10～13

[0036] On the basis of the overcoating method in Example 3, epoxy resin coatings were applied to the inner wall of the roof of a 5 L styrene storage tank according to different surface layer thicknesses, and the amount of TBC added accounted for 4% of the coating amount. Under the storage temperature of 40°C, the styrene condensate was collected regularly, and the content of polymerization inhibitor was analyzed. The results are shown in Table 3.

[0037] Table 3 Changes of inhibitor content in condensate under different topcoat thicknesses

[0038]

[0039] It can be seen from Table 3 that by changing the thickness of the surface layer, the release rate of the polymerization inhibitor can be better controlled, and the coating can be maintained for a longer polymerization inhibition time, reflecting the expected effect.

[0040] If no polymerization inhibitor is added to the coating, polymers will appear on the top of the tank and adhere to the inner wall under the same con...

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Abstract

The invention provides a method for preventing polymerization of aromatic olefin monomers in the storage process, which is characterized by coating the inner wall of an aromatic olefin storage tank, wherein the coating comprises a bottom layer, an intermediate layer and a surface layer; the bottom layer and the surface layer do not contain polymerization inhibitors; and the intermediate layer contains polymerization inhibitors. In the method, layered coating method is adopted, the polymerization inhibition coating is coated on the inner wall of the storage tank, the polymerization inhibitors can be released from the solidified coating, the release rate of the polymerization inhibitors is controlled by regulating the thickness of the surface layer, polymerization of monomer condensate at the top of the tank is prevented and the polymerization inhibition cycle is more than 4 years. The method can effectively reduce product loss caused by monomer polymerization, eliminate the hidden troubles that the products are polluted and even the products in the whole tank are not qualified because polymers are dissolved in the products and effectively lengthen the tank cleaning cycle.

Description

technical field [0001] The invention relates to a method for preventing polymerization of aromatic olefin monomers during storage, in particular to a method for preventing polymerization of styrene monomers during storage. Background technique [0002] Aromatic olefin monomers have lively chemical properties. For example, styrene is an important polymerizable monomer. It can be polymerized by itself or with other monomers, and is widely used in the fields of synthetic polymer materials, coatings, and medicine. Styrene undergoes slow thermally activated polymerization at ambient temperature. Therefore, when the aromatic olefin monomer is transported or stored, a polymerization inhibitor must be added to ensure product quality. [0003] The commonly used storage inhibitors are tert-butylcatechol (TBC), 2,5-di-t-pentylhydroquinone, benzoquinone, hydroquinone, p-hydroxyanisole, etc., which are crystalline at room temperature substance. During storage, at a certain temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/20C07C15/46C07C17/42C07C25/28
Inventor 菅秀君王申军潘清王业君张广
Owner CHINA PETROLEUM & CHEM CORP
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