Ethylene device quench oil viscosity reductant

An ethylene device and viscosity reducing agent technology, applied in the fields of hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of lack of dispersed and passivated metals, unsatisfactory viscosity reduction effect, etc., to improve the fractionation effect, use The method is simple and the effect of reducing scaling

Inactive Publication Date: 2007-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem of unsatisfactory visbreaking effect and lack of dispersion and passivation metal in the existing quenching oil visbreaking agent, the presen

Method used

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  • Ethylene device quench oil viscosity reductant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The phenolic antioxidant selects 2,6-di-tert-butyl p-cresol, the amine antioxidant selects 2-ethylhydroxylamine, and the phenolic antioxidant and the amine antioxidant are 4: 3 by weight Mixed in the same proportion as a polymerization inhibitor.

[0032] The dispersant is polyisobutylene succinimide with a molecular weight of 2,000.

[0033] As the metal deactivator, polymethylsiloxane with a molecular weight of 1,500 is selected.

[0034] The above-mentioned polymerization inhibitor, dispersant and metal deactivator were mixed evenly in a weight ratio of 3:1:1 to prepare the quenching oil viscosity reducer of this embodiment.

[0035]At a temperature of 200°C, 1000 grams of quenching oil sample (taken from the quenching system of the Yanshan ethylene plant) was added to the closed metal device, and the viscosity reducer of this embodiment was added in an amount of 500ppm (weight), and kept at a constant temperature for 48 hours , Take a sample every 4 hours to measu...

Embodiment 2

[0037] The phenolic antioxidant chooses 2,6-dimethyl-4-ethylphenol, the amine antioxidant chooses N,N'-di-tert-butyl-p-phenylenediamine, the phenolic antioxidant and the amine antioxidant The oxygen agent is mixed and prepared as a polymerization inhibitor in a weight ratio of 1:1.

[0038] The dispersant is polyisobutylene succinimide with a molecular weight of 2,000.

[0039] Dodecylbenzenesulfonic acid is selected as the metal deactivator.

[0040] The above-mentioned polymerization inhibitor, dispersant and metal deactivator were mixed evenly in a weight ratio of 3:1:1 to prepare the quenching oil viscosity reducer of this embodiment.

[0041] At a temperature of 200°C, 1000 grams of quenching oil sample (identical to Example 1) was added to a closed metal device without adding any viscosity reducer, kept at a constant temperature for 48 hours, and a sample was taken every 4 hours to measure the property of the quenching oil sample. kinematic viscosity. The test results...

Embodiment 3

[0048] This embodiment is to measure the thermal stability of the quenching oil viscosity reducer of the present invention.

[0049] The operating temperature of the circulating quenching oil is generally controlled below 220°C, but in the system, it will directly contact with the high-temperature cracking gas from the cracking furnace, and general chemicals will be decomposed to varying degrees. If the visbreaker is completely or mostly decomposed after one circulation with the quenching oil, the visbreaking effect will be lost. The decomposition temperature of the viscosity reducer of the present invention measured by DSC method (Differential Scanning Calorimetry, differential scanning calorimetry) is 350°C. Therefore, the possibility of the visbreaker decomposing under the quenching system is very small, and its visbreaking effect will not be affected.

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Abstract

The invention discloses an ethylene device quench oil viscosity reductant in inhibiting liquid viscosity intensification technical domain, which is characterized by the following: comprising with inhibitor, disperser and metal deactivator; possessing the function of aggregation inhibition, aggregation prevention and metallic surface deactivation; decreasing erosion and incrustation of quench system device; possessing little adding quantity and good stability; non-generating side effect of oil water emulsion.

Description

technical field [0001] The invention relates to a viscosity reducer for suppressing the increase of liquid viscosity, more specifically, the invention relates to a viscosity reducer used in the quenching oil system of an ethylene plant in the field of petrochemical industry. Background technique [0002] The quench oil system is an important part of the ethylene plant, it is directly connected to the two units of cracking and compression, and its operation has an important impact on the performance of the ethylene plant. Quench oil is the heavy component of the tower still after the cracked gas is cooled and fractionated in the quench oil tower. The distillation range is about 220°C to 500°C. It is rich in a large number of unsaturated aromatics, styrenes, indenes and other compounds that are easy to polymerize. The biggest feature of the quenching oil itself is that with the prolongation of the residence time in the system, the polymerization of unsaturated components and t...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C7/20
Inventor 李东风刘陆军侯经纬程建民廖丽华
Owner CHINA PETROLEUM & CHEM CORP
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