High-temperature compound polymerization inhibitor used in rectification process of aromatic alkene monomer and application thereof

A rectification process, a technology for aromatic olefins, which is applied in the purification/separation of hydrocarbons, hydrocarbons, chemical instruments and methods, etc. Reduce the cost of use, avoid potential safety hazards, avoid the effect of explosion or blockage of pipelines

Inactive Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of high-temperature composite polymerization inhibitor used in the rectification process of aromatic olefin monomer and its application, so that the polymerization inhibitor can have anti-scaling effect while exerting the polymerization inhibition effect at high temperature, and solve the current problem In the existing technology, it can only be compounded by a retarder and a real polymerization inhibitor, the compounded components are complicated, the polymerization inhibition effect is poor at high temperature, and the defect of anti-scaling is not good. It has low toxicity, good polymerization inhibition effect at high temperature and can prevent A compounded polymerization inhibitor for scale, to increase the yield of aromatic olefins, reduce pollution, and eliminate potential safety hazards

Method used

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  • High-temperature compound polymerization inhibitor used in rectification process of aromatic alkene monomer and application thereof
  • High-temperature compound polymerization inhibitor used in rectification process of aromatic alkene monomer and application thereof

Examples

Experimental program
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Embodiment 1

[0031] The present invention will be further described below in conjunction with embodiment, but it does not limit the implementation of the present invention.

Embodiment 1～12

[0033] Weigh the three components A, B, and C according to a certain proportion, add them into the four-necked flask together with styrene, add a condenser above the four-necked flask, and replace the air in the system with nitrogen for 5 minutes to Reduce the oxygen content in the flask, then seal the system, heat the four-neck flask in a constant temperature heater, and heat it at a constant temperature at 125°C for 2 hours, and take samples to analyze the content of polystyrene in styrene.

[0034] Determination of the amount of polymer produced by gravimetric method: taking advantage of the property that the polymer is insoluble in methanol, add enough dry methanol to the sample to completely precipitate the polymer, then filter, dry, weigh, and keep the weight constant to obtain The mass of polymer produced.

[0035] The formula of embodiment 1-12 and experimental result thereof are as shown in table 1, and in the table, the distribution ratio of each component of polymer...

Embodiment 13

[0043] Prepare a polymerization inhibitor according to the process described in Example 1, and add it to styrene, keep the temperature at 125°C for 3 hours, sample and analyze the content of polystyrene in styrene, wherein the compounded polymerization inhibitor is: 20 parts 1-TMHPO (component A), 20 parts THB-3 (component B), 100 parts naphtha. Based on the mass of styrene as 100 parts, the changes in the polymerization inhibition effect under the conditions of different polymerization inhibitor dosages in Example 13 are shown in Table 2.

[0044] Table 2 Comparison of polymerization inhibition effects at different dosages

[0045] Amount of compounded polymerization inhibitor, parts by mass Polymer content% 0.005 1.21 0.010 0.80 0.030 0.25 0.040 0.06 0.050 0.00 0.070 0.00

[0046] It can be seen that with the increase of the amount of polymerization inhibitor, the effect of polymerization inhibition is obviously improved.

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Abstract

The invention relates to a high-temperature compound polymerization inhibitor used in a rectification process of an aromatic alkene monomer and an application thereof. The compound polymerization inhibitor includes a component A, a component B and a component C, wherein the component A is a piperidine nitroxyl free radical compound, the component B is an alkoxyphenol compound, and the component C is solvent oil. The polymerization inhibitor has polymerization inhibition effect at high temperature and also has anti-scaling effect, thus solving the problems that polymerization inhibition is achieved only if a polymerization retarder is compounded with a real polymerization inhibitor, and the compound is complex in ingredient, has poor polymerization inhibition effect at high temperature and has no anti-scaling effect. The compound polymerization inhibitor has low toxicity, has good polymerization inhibition effect at high temperature and has the anti-scaling effect, thereby increasing rectification yield of aromatic alkene, reducing pollution and eliminating safety risk.

Description

technical field [0001] The invention relates to a high-temperature composite polymerization inhibitor used in the rectification process of aromatic olefin monomers and its application. 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. Styrene is a versatile polymeric monomer that can be polymerized by itself or with other monomers to become a raw material used in the manufacture of a large number of household and industrial products. Styrene has active chemical properties and is easy to polymerize. It can undergo slow thermally activated polymerization at ambient temperature. The higher the temperature, the faster the polymerization rate. In order to reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C15/46
Inventor 菅秀君王申军马瑞杰贾庆龙
Owner CHINA PETROLEUM & CHEM CORP
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