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Method for reducing quenching-oil viscosity of ethene producer

A technology for ethylene plant and quenching oil, which is applied in the fields of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc. It can solve the problems of high viscosity and achieve the effects of reducing energy consumption, increasing the amount of steam generated, and reducing the amount of replenishment

Active Publication Date: 2007-11-21
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a new method for reducing the viscosity of the quenching oil in an ethylene plant, and successfully solve the problem of high viscosity in the operation of the quenching oil, so as to save energy and ensure the stable operation of the ethylene plant

Method used

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  • Method for reducing quenching-oil viscosity of ethene producer

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Effect test

Embodiment 1

[0025] The quenching system shown in Figure 1 is adopted, and the main equipment includes an oil washing tower 1, a quenching oil heat exchanger 2 and a pan oil heat exchanger 3.

[0026] The cracked gas from the outlet of the cracking furnace is preliminarily cooled to 230°C and sent to the bottom of the oil washing tower 1 through the pipeline 11, and is cooled by three reflux streams of 4, 5 and 6, and the heaviest quenching oil component in the material condenses to the bottom of the tower to form a quenching Oil, quenching oil enters the heat exchanger 2 through the pipeline 7 for cooling, most of it returns to the oil washing tower 1 through the pipeline 4, and a small part is sent out through the pipeline 13.

[0027] The pan oil produced in the middle of the oil washing tower 1 enters the heat exchanger 3 to be cooled through the pipeline 8, most of it returns to the oil washing tower 1 through the pipeline 5, part of the pan oil is mixed into the bottom of the tower th...

Embodiment 2

[0031] Add viscosity reducer in the quenching oil circulation system: the viscosity reducer enters the bottom of the oil washing tower 1 through the pipeline 12 together with the pan oil in the pipeline 9 to jointly adjust the viscosity of the quenching oil.

[0032] Add a viscosity reducer to the middle pan oil that is blended into the bottom of the tower to adjust the viscosity. The weight percentage of each component in the viscosity reducer is: 20% dodecylbenzenesulfonic acid, 15% dispersant, N.N diethyl Hydroxylamine 12%, water treatment agent 12%, 2.6-di-tert-butyl p-cresol 5%, quench oil antioxidant 10%, petroleum refining corrosion inhibitor 16%, hydrocarbon solvent (C 9 )10%. The injection concentration of viscosity reducer is 6-10ppm.

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Abstract

A method for breaking viscosity quenching oil of ethane apparatus is carried out by cooling pyrolysis gas from pyrolyzer, delivering it into oil-leaching tower bottom, separating from substances to form triple backflows, cooling by quenching oil at tower bottom, returning to oil-leaching tower partially, entering backflow gasoline at tower top into by pipeline, cooling substances from pyrolyzer and delivering into after system. It's stable, has high viscosity and saves energy resources.

Description

technical field [0001] The invention relates to a quenching oil circulation system in steam cracking ethylene industry. Background technique [0002] At present, the steam thermal cracking process is mainly used in the world to produce ethylene, naphtha and other raw materials are cracked at a temperature above 800 °C, and the cracked products are rapidly cooled to 230 °C at the outlet of the cracking furnace, and then enter the oil washing tower. The light components below carbon 9 are separated at the top of the tower, the heavier components extracted from the middle section of the tower are called pan oil, and the heavier components at the bottom of the tower are quenched oil. Since the quenching oil contains unsaturated aromatic components such as styrene and indene, they will polymerize and generate macromolecular substances during the long-term high-temperature circulation, which will cause the viscosity of the quenching oil to increase conti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/02C07C11/04
Inventor 刘玉东王怀清高大鹏
Owner PETROCHINA CO LTD
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