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Storage method of aromatic olefin monomer

A storage method and technology of aromatic olefins, applied in chemical instruments and methods, purification/separation of hydrocarbons, disproportionation separation/purification of halogenated hydrocarbons, etc. Adhesion decline and other problems, to achieve the effect of prolonging the period of maintenance and cleaning tanks, reducing the amount of coating, and improving adhesion

Active Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for storing aromatic olefin monomers in storage tanks. This method solves the problem of the large amount of coating materials used in the prior art by changing the coating method and the addition method of the polymerization inhibitor. , the long construction process and the problem that the adhesion of the coating decreases after the addition of the polymerization inhibitor. This method prolongs the cleaning period of the storage tank

Method used

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  • Storage method of aromatic olefin monomer
  • Storage method of aromatic olefin monomer
  • Storage method of aromatic olefin monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0029] Paint epoxy resin paint on the standard tinplate plate (50×100×0.2~0.3mm), the amount of polymerization inhibitor TBC accounts for 2% or 5% of the primer amount (mass, the same below), first grind TBC, Then use a sieve to sieve, the polymerization inhibitor particles are below 200 mesh, add the sieved TBC to the epoxy paint, stir at a temperature of 30°C, add auxiliary materials and mix for 0.5 hours after the material is coated. Brush for later use. Two-layer and three-layer overcoating methods are adopted respectively, wherein the thickness of the bottom layer in Examples 1-2 is about 30 μm, the thickness of the middle layer is about 60 μm, and the surface layer is about 100 μm. The thickness of the bottom layer in Examples 3-4 is about 30 μm, and the thickness of the surface layer is about 110 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 2 months. The results are show...

Embodiment 5～12

[0034] On the standard tinplate (50×100×0.2~0.3mm), use different coatings, different polymerization inhibitors, and two-layer overcoating methods to paint, and the addition of polymerization inhibitors accounts for 15% of the primer. The mixing temperature of the polymerization agent and the paint is 45°C, and the change of the coating adhesion is shown in Table 2. The thickness of the bottom layer is about 60 μm, and the thickness of the surface layer is about 150 μm.

[0035] Table 2 Variation of adhesion of different coatings

[0036]

[0037]

[0038] It can be seen from Table 2 that no matter what kind of coating, the suitable method of adding the polymerization inhibitor should be directly added to the coating. The finer the polymerization inhibitor particles, the higher the mesh number, and the more uniform it is after mixing with the coating, which is conducive to the improvement of coating adhesion. improve. After the above-mentioned coated boards were soaked...

Embodiment 13～16

[0040] Brush epoxy resin paint on the inner wall of the 5L styrene storage tank tank top, wherein the polymerization inhibitor is a compound of TBC and DNPC, and the total addition accounts for 25% of the primer amount, wherein TBC: DNPC mass ratio is respectively: Example 13 is 2:1, Example 14 is 8:1, Example 15 is 1:3, Example 16 is 1:7, first mix the polymerization inhibitor and then grind and sieve to 200 mesh, then compound The polymerization inhibitor is added to the epoxy paint, stirred at a temperature of 35°C until uniform, and then mixed with auxiliary materials evenly, and the method of two-layer overcoating is used to paint according to different surface thicknesses. 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.

[0041] Table 3 Changes in the content of polymerization inhibitors in the condensate under different thicknesses of the bo...

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Abstract

The invention relates to a storage method for monomers, in particular to a storage method for aromatic olefin monomers in storage tanks. The method for storing aromatic olefin monomers in the storage tank according to the present invention is to paint the inner wall of the aromatic olefin monomer storage tank with a coating containing a polymerization inhibitor. The coating is composed of a bottom layer and a surface layer, and the bottom layer is The coating contains a polymerization inhibitor, and the surface layer is a coating without a polymerization inhibitor. The storage method of the aromatic olefin monomer described in the present invention is different from the protective coating process effect described in the prior art. In the implementation process, the polymerization inhibitor is added to the coating material after being ground and screened, and heating The mixing method has good compatibility with the coating material, and a large amount of polymerization inhibitor is added, which effectively improves the adhesion of the coating and the duration of polymerization inhibition, so as to achieve the effect of long-term polymerization inhibition, and the polymerization inhibition period can reach more than 6 years.

Description

technical field [0001] The invention relates to a storage method for monomers, in particular to a storage method for aromatic olefin monomers in storage tanks. Background technique [0002] Aromatic olefin monomers are chemically active. For example, styrene is an important polymerizable monomer, which 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] 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, part of the aromatic olefin monomer in the storage tank will vaporize an...

Claims

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Application Information

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