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Coal tar suspended bed hydrocracking method

A hydrocracking and suspended bed technology, which is used in hydrocarbon oil cracking, hydrotreating process, and hydrocarbon oil treatment, etc., can solve the problem of difficult and continuous separation of catalysts and high-temperature heavy oil products, aggravating the coking tendency of high-temperature oil products, Equipment, valve wear and other problems are accelerated, so as to reduce the risk of coking, improve the reaction conversion rate, and avoid coking.

Active Publication Date: 2017-05-24
LUOYANG PETROCHEMICAL ENG CORP SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in this patent, a solid-liquid separator is used to filter or centrifuge the reaction product. In actual production, it is difficult to achieve effective and continuous separation of catalysts with small particle sizes and high-temperature heavy oils, which may lead to large Partially deactivated catalyst particles circulate in the device, causing accelerated wear of equipment and valves, and easily aggravating the coking tendency of high-temperature oil products
At the same time, when the feed rate of the device changes, the flow rate in the reactor decreases, and back-mixing between materials easily occurs, which affects the reaction conversion rate.

Method used

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  • Coal tar suspended bed hydrocracking method
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  • Coal tar suspended bed hydrocracking method

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Experimental program
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Effect test

Embodiment 1

[0041] Coal tar raw material 15 is desalted, dehydrated, and mechanically impurity removed in the raw material pretreatment unit 1, and then mixed evenly with the atmospheric pressure tower bottom circulating heavy oil 38, vacuum wax oil 41, catalyst 16, and co-catalyst 17 in the raw material slurry configuration unit 2 into raw material oil slurry, the raw material oil slurry and hydrogen mixture are merged into mixed feedstock and hot high-separation gas for heat exchange, enter the reaction feed heating furnace 4 to heat up, and mix with the circulating hot high-separation oil 22 at the furnace outlet to meet the reaction requirements The temperature enters the suspension bed reactor 5 for hydrocracking reaction. A suspension bed reactor is set, the reaction temperature is 380°C, and the operating pressure is 10MPa. The reaction product 21 of the suspension bed reactor 5 first enters the hot high-pressure separator 6 for gasification. , liquid-solid separation, the hot high-...

Embodiment 2

[0043] The high-temperature coal tar in Table 1 is used as the raw material for suspension bed hydrocracking, the reaction conditions are 455°C, 19MPaG, the hydrogen-oil ratio is 1350, and the space velocity is 0.5h -1 , the weight percentage of the high-fraction oil circulation is 50%, the weight percentage of the atmospheric heavy oil circulation is 60%, the vacuum wax oil is all circulated, and the vacuum residue and catalyst residue do not participate in the circulation. The obtained product distribution and yield are shown in Table 2.

[0044] Table 1 Properties of full-fraction high-temperature coal tar

[0045]

[0046]

[0047] Table 2 Properties of a full-fraction high-temperature coal tar

[0048]

Embodiment 3

[0050] The coal tar raw material 15 is desalted, dehydrated, and mechanically impurity removed in the raw material pretreatment unit 1, and then mixed evenly with the atmospheric pressure tower bottom circulating heavy oil 38, vacuum wax oil 41, catalyst 16, and co-catalyst 17 in the raw material slurry configuration unit 2 into raw material oil slurry, the raw material oil slurry and hydrogen mixture are merged into mixed feedstock and hot high-separation gas for heat exchange, enter the reaction feed heating furnace 4 to heat up, and mix with the circulating hot high-separation oil 22 at the furnace outlet to meet the reaction requirements The temperature enters the suspension bed reactor 5 for hydrocracking reaction. A suspension bed reactor is set, the reaction temperature is 500°C, and the operating pressure is 25MPa. The reaction product 21 of the suspension bed reactor 5 first enters the hot high pressure separator 6 for gasification. , liquid-solid separation, the hot h...

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Abstract

The invention discloses a coal tar suspended bed hydrocracking method which comprises the steps of pretreating coal tar; mixing the coal tar with a catalyst and a catalyst promoter to form even raw material oil slurry; putting the raw material oil slurry into a suspended bed reactor; enabling a reaction product to enter a hot high-pressure separator, a warm high-pressure separator, a cold high-pressure separator and a cold low-pressure separator; separating the reaction product; circulating separated hydrogen; enabling separated liquid and catalyst to enter an atmospheric vacuum device to distill out a product and a catalyst, wherein the catalyst can be used circularly. The method has the advantages of low back mixing degree of materials in the reactor, wide raw material adaptability and flexibility in operation.

Description

technical field [0001] The invention relates to a high-conversion full-fraction coal tar suspended bed hydrocracking treatment process in the field of coal chemical industry, in particular to a process for producing naphtha using high-, medium-, and low-temperature full-fraction coal tar, especially high-temperature coal tar, as raw materials A method and device for hydrocracking of oil and diesel fractions in a suspended bed of full-fraction coal tar. Background technique [0002] Coal tar is a by-produced liquid product in the process of carbonization and gasification of coal. According to different carbonization temperatures and methods, the following types of tars can be obtained: 450-650°C low-temperature carbonization tar, 600-800°C low- and medium-temperature generator tar, 900°C ~1000℃ medium temperature vertical furnace tar and 1000℃ high temperature coking tar. Coal tar chemical industry occupies an important position in the chemical industry. At present, the annu...

Claims

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Application Information

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IPC IPC(8): C10G67/02C10G47/26
CPCC10G47/26C10G67/02
Inventor 朱华兴薛皓韩旭辉杨晓凌左铁
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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