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Quenching oil viscosity breaking agent in cracking fractionator

A technology of visbreaker and quenching oil, which is applied in the fields of hydrocarbon cracking, distillation purification/separation, organic chemistry, etc., and can solve problems that have not been used before, limit the wide application of visbreakers, increase production costs and operating expenses, etc. , to achieve the effect of improving thermal efficiency, improving separation effect and low cost

Inactive Publication Date: 2005-01-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Controlling the viscosity of the quench oil in this manner can significantly increase production costs and operating expenses
Another method is to introduce low-viscosity substances into the system to reduce the viscosity of the circulating quenching oil, for example, by continuously adding low-viscosity components with a boiling range of 300 to 370 in the circulating quenching oil to maintain the viscosity of the circulating quenching oil. Ways to control the viscosity of quenching oil will also increase production costs and operating costs
[0005] At present, some foreign companies, such as Exxon and Nalco, have achieved good results by adding viscosity reducers to suppress the increase in the viscosity of quenching oil. Used in domestic ethylene plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Preparation of viscosity reducer: 2,6-di-tert-butyl-4-ethylphenol is selected as hindered phenolic antioxidant, tris(2,4-di-tert-butylphenyl) phosphite antioxidant is selected Phosphate ester, the hindered phenolic antioxidant and the phosphite antioxidant are uniformly mixed in a weight ratio of 1:5 to prepare a polymerization inhibitor. As the dispersant, bis-succinimide with a molecular weight of polyisobutylene of 1500 is selected, and the dispersant and the polymerization inhibitor are uniformly mixed in a weight ratio of 1:4 to prepare a viscosity reducer.

[0020] 250 grams of the quenching oil sample are packed in a 500ml four-necked bottle, and 1000 ppm of the viscosity reducer of the present invention is added, and electric stirring and a condenser are installed on the four-necked bottle to avoid the increase in the viscosity of the quenching oil due to changes in the components of the quenching oil . Heat to 225°C for 12 hours at a constant temperature, and ...

example 2

[0022] Preparation of viscosity reducer: 2,6-di-tert-butyl-4-ethylphenol and β-(4-hydroxyl-3,5-di-tert-butylphenyl)propionic acid n-decylphenol were selected as hindered phenolic antioxidants The weight ratio of octacarbon alcohol ester is a mixture of 1:2, and the phosphite antioxidant is selected from three (2,4-di-tert-butylphenyl) phosphite, and the hindered phenolic antioxidant and phosphite The anti-oxidant is uniformly mixed in a weight ratio of 1:5 to prepare a polymerization inhibitor. As the dispersant, bis-succinimide with a molecular weight of polyisobutylene of 1500 is selected, and the dispersant and the polymerization inhibitor are uniformly mixed in a weight ratio of 1:4 to prepare a viscosity reducer.

[0023] 250 grams of the quenching oil sample are packed in a 500ml four-necked bottle, and 1000 ppm of the viscosity reducer of the present invention is added, and electric stirring and a condenser are installed on the four-necked bottle to avoid the increase i...

example 5

[0030] Although the operating control temperature of the circulating quenching oil does not exceed 220°C, during the actual operation of the device, the circulating quenching oil will mix and contact with the cracked material at 450°C, so the viscosity reducer needs to have certain high temperature stability. We examined the high temperature stability performance of the viscosity reducer of the present invention by differential scanning calorimetry. The thermal decomposition temperature of the visbreaker was measured to be 345°C.

[0031] We can see that the thermal decomposition temperature of the visbreaker is much higher than the operating control temperature of the circulating quenching oil, so we can properly increase the operating temperature of the quenching oil tower in the plant system, thereby increasing the light component recovery of the quenching oil tower rate, increasing the economic benefits of the device.

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Abstract

The invention provides a process for preparing quenching oil viscosity breaking agent in cracking fractionator through preparing viscosity breaking agent from polymerization inhibitor and dispersing agent, wherein the weight proportion of the emulsifying agent and the polymerization inhibitor is 1:0.1-10, the emulsifying agent employs de-succinimide prepared from polyisobutylene whose molecular weight is 1000-3000, the polymerization inhibitor is prepared from barred phenolic antioxidant and phosphates anti-oxidant

Description

[0001] Involved areas [0002] The invention relates to a visbreaker for controlling circulating quenching oil in an ethylene cracking unit, in particular to the preparation of a high-efficiency visbreaker suitable for various ethylene plant process conditions. Background technique [0003] During the cracking production process of ethylene, naphtha, light hydrocarbons, etc. are thermally cracked at 750-850°C, and the cracked products are rapidly cooled to 350-450°C at the outlet of the cracking furnace. Then it is mixed with circulating quenching oil and cooled to about 220°C and sent to the quenching oil tower. The light components below carbon 9 are separated from the top of the quenching oil tower, and the heavy components above carbon 9 are at the bottom of the tower. A part of the material at the bottom of the quench oil column is recycled to the feed of the quench oil column. Since the feed of the quench oil tower contains unsaturated aromatic hydrocarbons such as sty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/02C07C7/05C07C11/04
Inventor 齐泮仑包静严李建忠王熺顾爱萍西晓丽王刚佟华芳赵光辉马建英王路海秦丽华崔锡红
Owner PETROCHINA CO LTD
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