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Method for reducing viscosity of quenching oil of ethylene unit

An ethylene device and a technology for quenching oil, which are applied in chemical instruments and methods, processing of tar pitch/petroleum pitch/natural pitch, and refined hydrocarbon oil, etc., can solve the problem of high quench oil tower load, quench water emulsification, and high quench oil viscosity. question

Active Publication Date: 2015-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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
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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  • Method for reducing viscosity of quenching oil of ethylene unit
  • Method for reducing viscosity of quenching oil of ethylene unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 as shown,

[0047] A stream of quenching oil is drawn from the quenching oil circulation system of the ethylene plant, with a temperature of 170°C, a pressure of 0.16MPa, and a viscosity of 1500mm 2 / s.

[0048] The temperature of the mixed butane solvent (50% for normal isomerization) is 70° C., and the pressure is 1 MPa.

[0049] The extraction tower is a sieve plate tower, the pressure of the extraction tower is 1MPa, the quenching oil and the butane solvent are mixed at a weight ratio of 1:3 and enter the middle of the extraction tower, and another butane solvent whose weight is 1 times that of the quenching oil enters the extraction tower In the lower part, the temperature of the extraction tower is 70°C. The low-pressure liquid phase extraction is carried out in the extraction tower, the lighter oil phase is separated at the top of the tower, and the heavier asphalt phase is separated at the bottom of the tower. The asphalt phase is depressuri...

Embodiment 2

[0053] Such as figure 1 as shown,

[0054] A stream of quenching oil is drawn from the quenching oil circulation system of the ethylene plant, with a temperature of 170°C, a pressure of 0.16MPa, and a viscosity of 1500mm 2 / s.

[0055] The temperature of the mixed solvent (n-pentane and n-hexane each accounted for 50%) was 90° C., and the pressure was 0.5 MPa.

[0056] The extraction tower is a sieve plate tower, the pressure of the extraction tower is 1MPa, the quench oil enters the upper part of the extraction tower after being pressurized, and the mixed solvent 4 times the weight of the quench oil enters the lower part of the extraction tower, and the temperature of the extraction tower is 90 °C. A lighter oil phase is separated at the top of the column and a heavier asphalt phase is separated at the bottom of the column. The asphalt phase is depressurized to normal pressure to remove the solvent, and then produced as fuel oil.

[0057] After heating the lighter oil pha...

Embodiment 3

[0059] Such as figure 1 as shown,

[0060] A stream of quenching oil is drawn from the quenching oil circulation system of the ethylene plant, with a temperature of 170°C, a pressure of 0.16MPa, and a viscosity of 1500mm 2 / s.

[0061] The temperature of the mixed butane solvent (50% for normal isomerization) is 70° C., and the pressure is 1 MPa.

[0062] The extraction tower is a sieve plate tower, the pressure of the extraction tower is 1MPa, the quenching oil and the butane solvent are mixed at a weight ratio of 1:3 and enter the middle of the extraction tower, and another butane solvent whose weight is 1 times that of the quenching oil enters the extraction tower In the lower part, the temperature of the extraction tower is 70°C. The low-pressure liquid phase extraction is carried out in the extraction tower, the lighter oil phase is separated at the top of the tower, and the heavier asphalt phase is separated at the bottom of the tower. The asphalt phase is depressuri...

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Abstract

The invention discloses a low-pressure liquid-phase extraction method for reducing viscosity of quenching oil of an ethylene unit. The method comprises the steps of: (1) low-pressure liquid-phase extraction: introducing a stream of quenching oil from the bottom of an oil washing tower, implementing liquid-phase counter-current extraction in an extraction tower by utilizing a solvent, and separating a lighter oil phase at the tower top; or after extraction, (2) evaporative recovery of the solvent: filling the lighter oil phase into a solvent recovery tower, changing the solvent from a liquid state to a gaseous state through evaporation, and obtaining the solvent and viscosity reducing quenching oil through separation, wherein the viscosity reducing quenching oil returns to the middle of a quenching oil tower after the temperature and pressure are reduced, and the solvent is recycled. In the method, the asphaltene in the quenching oil is removed through liquid-phase extraction with the solvent or the viscosity reducing quenching oil is obtained through the step of evaporative recovery of the solvent after extraction, thus reducing the viscosity of the quenching oil; and the low-pressure liquid-phase extraction method is low in requirements for equipment and is less in investment.

Description

technical field [0001] The invention relates to the field of ethylene production in petrochemical industry, and furthermore, relates to a method for reducing the viscosity of quenching oil in an ethylene unit. Background technique [0002] At present, the steam pyrolysis process is mainly used in the world 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 oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/00C10G21/28C10C3/00C07C11/04C07C7/00
Inventor 王国清杜志国刘同举
Owner CHINA PETROLEUM & CHEM CORP