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Scale inhibitor for styrene rectification system

The technology of a rectification system and a scale inhibitor is applied in the field of scale inhibitor of a styrene rectification system, which can solve the problems affecting the long-term operation of the device, the rise of the tower pressure difference, and the dispersion cleaning, so as to inhibit the generation of scales, reduce the The effect of avoiding blockage of the tower and meeting the production requirements

Inactive Publication Date: 2011-05-25
浙江杭化科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Then, because the nature of styrene is very lively and the polymerization activity is very high, it is difficult to completely terminate its polymerization reaction. The polymerization inhibitors proposed in the published literature all slow down the polymerization of styrene to a certain extent by catching the free radicals of styrene chains. The polymerization is completely terminated, and the scale (polymer) adhering to the surface of the equipment cannot be dispersed and cleaned, so the scale will continue to increase, and the pressure difference of the tower will still gradually rise, which will still affect the long-term operation of the device

Method used

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  • Scale inhibitor for styrene rectification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 100g 2,6-di-tert-butyl-4-methoxyphenol, 150g 2,6-dinitro-p-cresol, 180g isopropylhydroxylamine, 170g dienylsuccinimide and 400g ethylbenzene to the container , heat and stir, fully dissolve and mix evenly, cool to room temperature, and filter to obtain the scale inhibitor.

[0033] The antiscalant agent prepared in Example 1 was evaluated for antiscaling performance.

[0034] Evaluation of antiscalant performance

[0035] The scale inhibition performance of the scale inhibitor of the present invention is evaluated by a simulation device.

[0036] Prepare the test solution: Pour the refined styrene into the container, then add 200ppm (based on the total amount of styrene) of the scale inhibitor prepared by the above method, stir evenly, and obtain the evaluation solution.

[0037] Scale inhibition performance evaluation: put a certain amount of stainless steel filler in a self-made stainless steel simulation tower, set a liquid distributor on the top of the filler,...

Embodiment 2

[0044] Add 200g of 2,4,6-tri-tert-butylphenol, 100g of 4,6-dinitro-o-cresol, 150g of ethyl hydroxylamine, 100g of low-nitrogen polyisobutylene succinimide and 450g of toluene into the container, heat and stir, After fully dissolving and mixing evenly, cool to room temperature and filter to obtain the scale inhibitor. The scale inhibition performance evaluation method is the same as that in Example 1.

Embodiment 3

[0046] 100g2,6-di-tert-butyl-4-isobutylphenol, 150g2,6-dinitro-p-cresol, 100g N,N'-dihydroxypropyl hydroxylamine, 50g monoalkenyl succinimide and Add 600g of xylene into the container, heat and stir, fully dissolve and mix evenly, cool to room temperature, and filter to obtain the scale inhibitor. The scale inhibition performance evaluation method is the same as that in Example 1.

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Abstract

The invention relates to a scale inhibitor for a styrene rectification system. The technical problem to be solved by the invention is to inhibit the generation of the scaling matter in the styrene rectification system and disperse the scaling matter adhered to the surface of the equipment so as to prolong the operation cycle of the styrene equipment. The scale inhibitor comprises the following components by weight percent: 5-20% of antioxidant, 5-35% of nitrophenol polymerization inhibitor, 5-35% of hydroxylamine polymerization inhibitor, 5-40% of dispersant and 35-60% of organic solvent.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a scale inhibitor used in a styrene rectification system. Background technique [0002] At present, the vast majority of styrene production methods in the world use ethylbenzene gas-phase catalytic dehydrogenation process, that is, ethylbenzene is used as raw material, with the help of catalysts such as iron oxide-chromium or zinc oxide, and multi-stage adiabatic or tubular isothermal reactors are used. Dehydrogenation to styrene in the presence of steam. The dehydrogenation product crude styrene after dehydrogenation of ethylbenzene contains besides styrene, ethylbenzene and by-products benzene, toluene and a small amount of tar, etc., and further distillation is required to obtain high-purity styrene. [0003] However, during the rectification process, due to the initiation of metal ions, trace oxygen and heat, styrene is prone to free radical polymerization, which not only leads to mater...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C7/20C07C7/04
Inventor 程文武林龙平熊强华沈勤梅琚俊芳楼继浩
Owner 浙江杭化科技股份有限公司
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