Compound polymerization inhibitor and its application

A technology of polymerization inhibitor and resistance distribution, applied in compound polymerization inhibitor and its application in styrene rectification system, can solve the problems of affecting the long-term operation of the device, difficult polymerization reaction, and high polymerization activity, and achieves The effect of safe and stable long-term operation, improving economic benefits and reducing tar yield

Inactive Publication Date: 2018-07-31
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the very active nature of styrene and its high polymerization activity, it is difficult to completely terminate its polymerization reaction.
After the polymer is produced, it is easy to adhere to the surface of the equipment. After the accumulation increases, it is difficult to clean up, which affects the long-term operation of the device.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0020] Weigh a certain amount of styrene and polymerization inhibitor and add them into a three-necked or four-necked flask equipped with nitrogen purging, thermometer, reflux condenser, mechanical or magnetic stirring. After the system was replaced with nitrogen, it was heated at 120°C for 2 hours, and samples were taken to analyze the polystyrene content. The results are shown in Table 1.

[0021] The polymerization inhibition effect of different polymerization inhibitors of table 1

[0022] experiment number

[0023] Note: The hydroxylamine used in experiment 1 is dihydroxypropyl hydroxylamine; the phenylenediamine used in experiment 2 is p-phenylenediamine; in experiment 3, TMHPO refers to 2,2,6,6-tetramethyl-4-hydroxypiper pyridyloxy free radical. As can be seen from the results in Table 1, under the same experimental conditions, the inhibitory effect of the polymerization inhibitor of the present invention is better than other several compounding schemes.

Embodiment 5～12

[0025] According to the different mass fractions of the two components A and B and the organic solvent in the compounded polymerization inhibitor, formulate the compounding scheme, see Table 2.

[0026] Table 2 Compounding scheme of polymerization inhibitor

[0027] Compound inhibitor

A component mass fraction

B component mass fraction

Organic solvent mass fraction

Inhibitor 1

0.05

0.05

0.9

Inhibitor 2

0.05

0.5

0.45

Inhibitor 3

0.4

0.05

0.55

Inhibitor 4

0.4

0.5

0.1

Inhibitor 5

0.1

0.3

0.6

Inhibitor 6

0.3

0.1

0.6

Inhibitor 7

0.3

0.2

0.5

Inhibitor 8

0.3

0.3

0.4

[0028] The compounded polymerization inhibitors were used in the same amount, heated at 120°C for 2 hours, and samples were taken to analyze the styrene polymer content. The results are shown in Table 3.

[0029] Table 3 The impact of different compounding ratios on th...

Embodiment 13～19

[0032] The polymerization inhibitor of the present invention was prepared according to the ratio of polymerization inhibitor 8, and the influence of different polymerization inhibitor dosages on the polymerization inhibition effect was investigated. The results are shown in Table 4.

[0033] Table 4 The influence of polymerization inhibitor dosage on the polymerization inhibition effect

[0034] experiment number

[0035] The greater the amount of polymerization inhibitor used, the better the effect of polymerization inhibition. Considering the price factor, the preferred amount of polymerization inhibitor used in the present invention is 0.02% to 0.12%.

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Abstract

The invention relates to a compound polymerization inhibitor and its application in a styrene rectification system and belongs to the field of chemical production. The compound polymerization inhibitor comprises two components A and B, and an organic solvent. The component A is sodium ditridecyl sulfosuccinate, and the component B is N, N-diisopropylethanolamine. The organic solvent is ethylbenzene or styrene. Through the synergistic action of the components A and B, the polymerization inhibiting effects are improved, a tar yield is increased, a styrene yield is increased, the accumulation andadhesion of the formed styrene polymer are reduced, the risks of pipe blocking caused by a polymer and reduction of the heat exchange efficiency of the heat exchanger are reduced, the safe, stable and long-term operation of the styrene device is guaranteed and the economic benefits are improved.

Description

technical field [0001] The invention relates to a composite polymerization inhibitor and its application in a styrene rectification system, which belongs to the field of chemical production. Background technique [0002] Styrene (SM) is an important petrochemical basic product, and its most important use is as a monomer for synthetic rubber and plastics to produce styrene-butadiene rubber, polystyrene, foamed polystyrene, etc.; it can also be used with other monomers Copolymerize to produce a variety of engineering plastics for different purposes, such as ABS resin copolymerized with acrylonitrile and butadiene. [0003] Styrene can undergo self-polymerization reaction at room temperature, and the higher the temperature, the faster the polymerization rate. Polymerization during the distillation of styrene can lead to loss of monomers, blockage of pipes, resulting in high monomer production costs, and the formation of polymers that can adhere and accumulate on rectification ...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/20C07C15/46
CPCC07C7/04C07C7/20C07C15/46Y02P20/10
Inventor 王申军菅秀君贾庆龙朱相春
Owner CHINA PETROLEUM & CHEM CORP
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