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Method for reducing ethylene unit quenching oil viscosity and improving solvent recovery rate

A technology of ethylene plant and solvent recovery tower, which is applied in the petroleum industry, processing hydrocarbon oil, and only multi-stage serial refining process treatment, etc. It can solve problems such as unreasonable design, high load of quenching oil tower, and viscosity reduction effect.

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The disadvantages of this method are: first, when the ethane furnace burns, it must be stripped with high-pressure steam, and the gas phase directly returns to the quenching oil tower, and the load of the quenching oil tower is high; second, the light components in the heavy fuel oil are sent outside after stripping The content is small, and the outgoing pipeline is prone to blockage
This method only optimizes the temperature distribution of the oil scrubber, does not change the composition of the quenching oil, has little effect on reducing the viscosity, and increases the load in the middle section of the oil scrubber, affecting production capacity
[0011] Although the above method can partially reduce the viscosity of the quenching oil, it cannot fundamentally solve the problem of high viscosity of the quenching oil
At present, many ethylene plants in China have unreasonable design of the quenching oil visbreaking system, high viscosity of the quenching oil, high temperature at the top of the quenching oil tower, low temperature at the bottom of the tower, unstable operation of the quenching oil visbreaking system, and low heat recovery efficiency. Frequent emulsification of quenching water

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  • Method for reducing ethylene unit quenching oil viscosity and improving solvent recovery rate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Use propane as solvent for solvent extraction and viscosity reduction of quench oil. A stream of quench oil is drawn from the ethylene plant with a flow rate of 10t / h, and the obtained heavy quench oil is adjusted to a temperature of 30°C and a pressure of 5MPa. The solvent feed temperature is 30°C, the pressure is 5MPa, the flow rate is 5t / h, and the weight ratio of solvent to quench oil is 0.5. The quench oil and the solvent with a weight of 0.05 enter from the upper part of the extraction tower, and the rest of the solvent enters from the lower part of the extraction tower. The temperature of the extraction column is 30°C and the pressure is 5MPa. The extraction oil is separated from the top of the extraction tower, and the residual bitumen is separated from the bottom of the tower. After depressurizing the asphalt phase to 0.5MPa and removing the solvent, it is produced as fuel oil.

[0037] The pressure of the extracted oil flowing out of the top of the extraction ...

Embodiment 2

[0040] Use propane as solvent for solvent extraction and viscosity reduction of quench oil. A stream of quench oil is drawn from the ethylene plant with a flow rate of 10t / h, and the obtained heavy quench oil is adjusted to a temperature of 30°C and a pressure of 5MPa. The solvent feed temperature is 70°C, the pressure is 5MPa, the flow rate is 200t / h, and the weight ratio of solvent to quench oil is 20. The quench oil and the solvent with a weight of 0.05 enter from the upper part of the extraction tower, and the rest of the solvent enters from the lower part of the extraction tower. The temperature of the extraction column is 70°C and the pressure is 5MPa. The extraction oil is separated from the top of the extraction tower, and the residual bitumen is separated from the bottom of the tower. After depressurizing the asphalt phase to 0.5MPa and removing the solvent, it is produced as fuel oil.

[0041] The pressure of the extracted oil flowing out of the top of the extraction...

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Abstract

The invention discloses a method for reducing ethylene unit quenching oil viscosity and improving a solvent recovery rate. The methodd comprises that through extraction of quenching oil from the bottom of an oil washing tower and multistage recovery, viscosity-reduced quenching oil is obtained. The method comprises the following steps of 1, solvent-based extraction: carrying out solvent-based extraction on quenching oil and a solvent in an extraction tower, and separating extract oil and raffinate asphalt, and 2, solvent recovery: carrying out pressure reduction and / or heating on the extract oil obtained by the step 1, and separating the solvent and viscosity-reduced quenching oil in solvent recovery towers. The method realizes solvent-based extraction on ethylene unit quenching oil, removal of asphalt, recovery of the solvent by multistage solvent recovery processes and recycle of the solvent so that quenching oil viscosity is reduced and a solvent recovery rate is greatly improved.

Description

Technical field [0001] The invention relates to the field of ethylene production, and furthermore, to a method for reducing the viscosity of quench oil in an ethylene device and increasing the recovery rate of solvent. Background technique [0002] At present, major ethylene plants in the world use steam thermal cracking technology to produce basic organic chemical raw materials such as ethylene, propylene, butadiene, and aromatics. Light hydrocarbons, naphtha, hydrogenation tail oil and other raw materials are mixed with a certain proportion of diluted steam in an industrial cracking furnace to crack under high temperature conditions. The cracked products are quenched, compressed, and separated to produce ethylene, propylene, butylene. Chemical raw materials such as diene. [0003] The quench system is an important part of the ethylene plant. It consists of a quencher, an oil washing tower, a water washing tower and other equipment. It is responsible for the separation of pyrolys...

Claims

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Application Information

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IPC IPC(8): C10G53/04
CPCC10G53/04C10G2300/1088C10G2300/206C10G2300/302
Inventor 王国清杜志国刘同举郭莹巴海鹏张利军
Owner CHINA PETROLEUM & CHEM CORP
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