Compound polymerization inhibitor and application thereof in styrene rectification process

A technology of polymerization inhibitor and styrene, which is applied in the field of styrene composite polymerization inhibitor and its preparation, can solve problems such as the relationship is not clearly stated, and achieve the effects of reducing viscosity, stabilizing the polymerization inhibition effect, and prolonging the induction period

Active Publication Date: 2021-08-27
TANGSHAN XUYANG CHEM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, existing patents mainly research polymerization inhibitors that can effectively reduce the amount of polymers and tar, but there is no clear description of the relationship between polymerization inhibitors and the viscosity of the efflux tar. Therefore, it is still necessary to develop a new type of composite polymerization inhibitor. At the same time as the inhibition effect, it can effectively reduce the viscosity of the discharged tar and prevent the blockage of the tar pipeline

Method used

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  • Compound polymerization inhibitor and application thereof in styrene rectification process
  • Compound polymerization inhibitor and application thereof in styrene rectification process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0043] As shown in the following table 1, a series of composite polymerization inhibitors are obtained by compounding component A, component B, component C and high boiling point solvent; wherein, component A is 4-hydroxyl-2,2,6,6-tetra Methyl piperidine nitroxide radical, component B is 2,6-di-tert-butyl-4-benzylidene-cyclohexa-2,5-dienone, component C is diisopropylhydroxylamine, high The boiling point solvent is glycerol monomethyl ether.

[0044] Stir each component evenly at 30-35°C to obtain a clear red liquid, which is the compounded polymerization inhibitor.

[0045] Table 1 Composite formula table of polymerization inhibitor

[0046]

[0047] The obtained compounded polymerization inhibitor is added to styrene at a concentration of 600 ppm based on the mass of styrene, and is used for double-column continuous rectification of styrene. Distilled in figure 1 shown in the styrene distillation unit, in figure 1Among them, T401 is a styrene-ethylbenzene separation t...

Embodiment 10-17

[0071] According to the ratio of polymerization inhibitor 7, the compound polymerization inhibitor was prepared, that is, 10% of component A, 5% of component B, 3% of component C, and 82% of solvent. The results are shown in Table 4. The amount of polymerization inhibitor is calculated based on the mass of styrene.

[0072] Table 4 The influence of polymerization inhibitor dosage on the polymerization inhibition effect

[0073] experiment number Inhibitor dosage (ppm) Polymer content (ppm) Tar viscosity (cp, 150°C) Example 10 200 1450 22 Example 11 400 900 19 Example 12 600 700 17 Example 13 800 500 15 Example 14 1000 450 13 Example 15 1200 430 12 Example 16 1500 420 11 Example 17 2000 400 10

[0074] Conclusion: The greater the amount of polymerization inhibitor used, the better the effect of polymerization inhibition. The process requires that the polymer content should not exceed 500ppm, an...

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Abstract

The invention relates to a compound polymerization inhibitor and application thereof in a styrene rectification process. Based on the total mass of the polymerization inhibitor, the polymerization inhibitor comprises 4%-10% by mass of a nitroxide free radical compound; 5%-15% by mass of a quinone methyl compound; 1%-5% by mass of a hydroxylamine compound; and 70-90% by mass of an ether compound having a boiling point of 200 DEG C or more and a viscosity of 10 cp (20 DEG C) or less. The polymerization inhibitor applied to the styrene rectification process is good in polymerization inhibition effect, small in kinematic viscosity, low in toxicity and convenient to store and transport, has good solubility in the styrene rectification process, can effectively improve the rectification yield of styrene, reduce the viscosity of discharged tar and prevent a tar pipeline from being blocked, and is more suitable for industrial production requirements.

Description

technical field [0001] The invention belongs to the technical field of styrene polymerization inhibitors, and relates to a styrene compound polymerization inhibitor and its preparation method and application, in particular to a styrene compound polymerization inhibitor used in the styrene rectification process And its preparation method and application. Background technique [0002] Styrene is the basic raw material product of petrochemical industry, and it is also an important raw material for the synthesis of polymers such as polystyrene (PS) resin, ABS resin, and styrene-butadiene rubber. In addition, styrene is also widely used in pharmaceutical, paint, textile and other industries. Styrene is highly reactive and can undergo self-polymerization at room temperature, and the higher the temperature, the faster the polymerization rate. Industrially, styrene is mainly produced by gas-phase catalytic dehydrogenation of ethylbenzene. The mixed liquid after ethylbenzene dehydr...

Claims

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Application Information

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IPC IPC(8): C07C7/20C07C7/05C07C15/46
CPCC07C7/20C07C7/05C07C15/46
Inventor 徐海军杨文梁董洁灵田红杨卫娟王乐麻永强
Owner TANGSHAN XUYANG CHEM IND CO LTD
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