Method for producing ethylene from aromatic hydrocarbon raffinate

A technology for raffinating oil and aromatics, applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, organic chemistry, etc., can solve problems such as slowing down the coking rate of cracking furnace tubes, shortening the operating cycle of the device, and substandard product quality, etc., to achieve It is conducive to long-term stable operation, low maintenance cost, and slow down the effect of coking rate

Active Publication Date: 2021-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only slow down the coke formation rate of the cracking furnace tube, prolong the coke cleaning period, and ensure the stable operation of the ethylene cracking unit, but also effectively solve the problems of unqualified products or shortened operation period of the unit caused by the internal leakage of the cross-line valve, and solve the problem of accelerating Product quality substandard problems caused by the initial start-up of the hydrogen treatment unit

Method used

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  • Method for producing ethylene from aromatic hydrocarbon raffinate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] according to figure 1 New installation shown. Aromatic hydrocarbon raffinate oil is fully mixed and dissolved in the SX static mixer through the feed pump, the first heat exchanger 2 and hydrogen, and then heat-exchanged by the second heat exchanger 4, and enters from the bottom of the hydrogenation reactor 5 , contact with the hydrorefining catalyst, carry out hydrogenation reaction under the condition of hydrogenation reaction, make the olefins in the aromatic hydrocarbon raffinate saturated, and the aromatic hydrocarbon raffinate oil is in liquid state. After the reaction, the hydrogenation reaction effluent enters the stabilization tower 6 for gas-liquid separation, and light hydrocarbons below C5 are obtained at the top of the tower, while the bottom material is passed into the ethylene cracking device 8 for cracking. The content of olefins in the aromatics raffinate before and after the hydrogenation reaction is listed in Table 2.

[0050] Adopt the method of th...

Embodiment 2

[0054] according to figure 1 New installation shown. Aromatic hydrocarbon raffinate oil is fully mixed and dissolved in the SX static mixer through the feed pump, the first heat exchanger 2 and hydrogen, and then heat-exchanged by the second heat exchanger 4, and enters from the bottom of the hydrogenation reactor 5 , contact with the hydrorefining catalyst, carry out hydrogenation reaction under the condition of hydrogenation reaction, make the olefins in the aromatic hydrocarbon raffinate saturated, and the aromatic hydrocarbon raffinate oil is in liquid state. After the reaction, the hydrogenation reaction effluent enters the stabilization tower 6 for gas-liquid separation, and light hydrocarbons below C5 are obtained at the top of the tower, while the bottom material is passed into the ethylene cracking device 8 for cracking. The content of olefins in the aromatics raffinate before and after the hydrogenation reaction is listed in Table 2.

[0055] Adopt the method of th...

Embodiment 3

[0066] During the test operation, open the second valve 11 and the third valve 12 on the cross-line, and keep the second valve 11 and the third valve 12 at a small opening to simulate the internal leakage of the valve. (the first valve 10 is not opened), the olefin content in the hydrogenation reaction effluent is greater than 0.5wt%, and after the leak-proof pipeline is enabled (the first valve 10 is opened), the olefin content of the hydrogenation reaction effluent is stable, as low as 0.1wt%.

[0067]After calculation, under certain working conditions, when the catalyst performance is good (the product index is far lower than the control index), if there is 10% internal leakage, the olefin content in the hydrogenation reaction effluent is greater than 0.5wt%; when the catalyst is used In the later stage (the olefin content in the hydrogenation reaction effluent is close to 0.5wt%), if there is a slight internal leakage, it will be higher than 0.5wt%.

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Abstract

The invention discloses a method for producing ethylene by using aromatic hydrocarbon raffinate oil as raw material. The method comprises: the aromatic hydrocarbon raffinate enters the hydrogenation reactor, the hydrogenation reaction effluent is passed into the stabilization tower for gas-liquid separation treatment, and then the bottom material of the tower is passed into the ethylene cracking device; a cross-line is set to connect the hydrogenation reactor with the When the stabilization tower and ethylene cracking unit are isolated, the aromatics raffinate oil is directly introduced into the stabilization tower; a leak-proof pipeline is set up, one end of the leak-proof pipeline is connected to the cross-over line, and the other end is connected to the outlet pipeline of the circulation pump at the bottom of the stabilization tower. The method of the invention can slow down the coke formation rate of cracking furnace tubes, prolong the coke cleaning period, ensure the stable operation of the ethylene cracking unit, and solve the problem that the product quality is not up to standard caused by the initial stage of the hydrogenation treatment unit, and effectively solve the problem caused by the internal leakage of the cross-line valve. The problem of unqualified products or shortened operation cycle of the device.

Description

technical field [0001] The invention relates to a method for producing ethylene, in particular to a method for producing ethylene with aromatic raffinate as raw material. Background technique [0002] Aromatics extraction is an important process technology for the purification of aromatics in the petroleum refining process. Its main purpose is to separate BTX (benzene, toluene, xylene) from catalytic reforming or pyrolysis hydrogenated gasoline. The extraction process has the characteristics of good aromatics quality, high recovery rate and good adaptability of raw materials, while the raffinate basically does not contain aromatics, is rich in paraffins, and contains some naphthenes and a small amount of olefins, so it is a good raw material for ethylene cracking . [0003] In recent years, with the continuous expansion of my country's ethylene production scale, the shortage of ethylene raw materials has become increasingly prominent, which seriously restricts the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/04C07C11/04B01J8/02
CPCB01J8/02B01J8/0292C07C4/04C07C11/04
Inventor 徐大海牛世坤陈光李扬丁贺李士才崔国英代萌
Owner CHINA PETROLEUM & CHEM CORP
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