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Quenching oil extraction visbreaking system

A technology for quenching oil and extracting towers, which is applied in the treatment of hydrocarbon oils, refined hydrocarbon oils, and the petroleum industry. Scale and clogging, reduction of aggregation tendency, and improvement of separation ability

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

AI Technical Summary

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

Method used

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  • Quenching oil extraction visbreaking system

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Experimental program
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Effect test

Embodiment 1

[0035]A quenching oil extraction viscosity reduction system, comprising: an extraction tower and a solvent recovery tower, the extraction tower is provided with a quenching oil feed port and a solvent feed port, the top of the extraction tower is connected to the middle of the solvent recovery tower, and the solvent recovery tower The top is connected to the solvent feed port of the extraction tower;

[0036] The number of extraction trays is 11, and the number of theoretical trays is 2. The trays are large-pore sieve trays with an opening ratio of 18% and a diameter of φ24mm. The quenching oil inlet is on the first tray, and the solvent inlet is on the Below the 11th tray.

[0037] Using propane as solvent, the quench oil is subjected to solvent extraction and viscosity reduction treatment. The feed temperature of quenching oil is 70°C, the pressure is 5MPa, and the flow rate is 10t / h. The solvent feed temperature is 70°C, the pressure is 5MPa, and the flow rate is 10t / h. ...

Embodiment 2

[0040] The number of extraction trays in the quenching oil visbreaking system of the ethylene plant is 22, and the number of theoretical trays is 4. The trays are large-pore sieve trays with an opening ratio of 15% and a diameter of φ20mm. The quenching oil inlet is on the first tray Above, the solvent feed port is below the 24th tray.

[0041] Using n-butane as solvent, the quench oil is subjected to solvent extraction and viscosity reduction treatment. The feed temperature of quenching oil is 150°C, the pressure is 5MPa, and the flow rate is 10t / h. The solvent feed temperature is 150°C, the pressure is 5MPa, and the flow rate is 50t / h. The temperature of the extraction tower is 150°C and the pressure is 5MPa. The extraction oil is separated from the top of the extraction tower, and the raffinate is separated from the bottom of the tower. The asphalt phase is decompressed to 1MPa atmospheric pressure to remove the solvent, and then it is recovered as fuel oil.

[0042] Re...

Embodiment 3

[0044] The lower part of the extraction tower of the quenching oil visbreaking system of the ethylene plant is a large-pore sieve plate with an opening ratio of 12% and a diameter of φ18mm, with 11 plates and a theoretical plate number of 2; the upper part is a 2m high wire mesh packing with a theoretical plate number of 8 . The number of theoretical plates in the whole tower is 10, the large-pore sieve plate accounts for 20%, and the wire mesh packing accounts for 80%. The inlet for quenching oil is above the screen packing, and the inlet for solvent is under the 11th large-pore sieve tray.

[0045] Using n-butane as solvent, the quench oil is subjected to solvent extraction and viscosity reduction treatment. The feed temperature of quenching oil is 180°C, the pressure is 5MPa, and the flow rate is 10t / h. The solvent feed temperature is 180°C, the pressure is 5MPa, and the flow rate is 50t / h. The temperature of the extraction tower is 180°C and the pressure is 5MPa. The e...

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Abstract

The invention discloses a quenching oil extraction visbreaking system. The quenching oil extraction visbreaking system comprises an extraction tower and a solvent recovery tower. The extraction tower is provided with a quenching oil inlet and a solvent inlet. The top of the extraction tower is connected to the middle of the solvent recovery tower. The top of the solvent recovery tower is connected to the solvent inlet of the extraction tower. Large-hole sieve trays are arranged at the lower section of the extraction tower. Any one plate-type tower or packed tower structure is arranged at the upper section of the extraction tower. The number of the large-hole sieve trays is 20-100% the total number of the tower plates. The sieve tower plates are used in the quenching oil extraction visbreaking system so that a heavy component can be separated well and visbreaking effects are improved. The extraction tower can effectively improve a tower separation capability, reduces polymerization tendency of the quenching oil at the tower bottom, reduces scaling and blocking of members in the tower, improves visbreaking effects and prolongs a production period.

Description

technical field [0001] The invention relates to the field of ethylene production, and more particularly relates to a quenching oil extraction and viscosity reduction system. Background technique [0002] At present, major ethylene plants in the world use steam pyrolysis to produce basic organic chemical raw materials such as ethylene, propylene, butadiene, and aromatics. Raw materials such as light hydrocarbons, naphtha, and hydrogenated tail oil are mixed with a certain proportion of diluted steam in an industrial cracking furnace to undergo cracking reactions under high temperature conditions. Diene and other chemical raw materials. [0003] The quenching system is an important part of the ethylene plant. It is composed of quenching cooler, oil washing tower, water washing tower and other equipment. As the first process of ethylene cracking gas treatment, it often becomes the bottleneck restricting the output and long-term stable operation of the ethylene plant, and its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/00C10G21/28C07C11/04C07C7/00
CPCC07C7/00C10G21/14C10G21/28C10G2300/1007C07C11/04
Inventor 刘同举杜志国王国清张永刚南秀琴张利军
Owner CHINA PETROLEUM & CHEM CORP
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