1. A start-up oil feeding method of a suspension bed hydrogenation device using ethylene cracking tar as a raw material is characterized by comprising the following steps: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, a start-up cycle flow of ethylene cracking tar is firstly carried out on the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, a metal sulfide catalyst is started to be added into the suspension bed reactor, after the required metal sulfide catalyst is added, hydrogen is input into the suspension bed reactor, and then the ethylene cracking tar is hydrogenated and produced according to a conventional ethylene cracking tar hydrogenation method.

2. The start-up oil feeding method of the suspension bed hydrogenation device using ethylene cracking tar as the raw material according to claim 1, wherein the mass ratio of the metal sulfide catalyst to the ethylene cracking tar is 0.0001:1 to 1: 19.

Background

Suspension bed hydrogenation unit is processing ethylene pyrolysis tar and is opening the worker in-process, gets into suspension bed reactor after ethylene pyrolysis tar and the catalyst misce bene that has configured, after promoting hydrogen and fully backmixing ethylene pyrolysis tar and catalyst through suspension bed reactor bottom, a large amount of foams appear in suspension bed reactor inside, makes subsequent hot high pressure separator and cold high pressure separator also appear a large amount of foams, and final foam gets into the circulating hydrogen compressor, leads to suspension bed hydrogenation unit to be compelled to shut down.

Disclosure of Invention

The invention provides a start-up oil feeding method of a suspension bed hydrogenation device using ethylene cracking tar as a raw material, which overcomes the defects of the prior art and can effectively solve the problem that the suspension bed hydrogenation device is easy to stop by using a feeding method used in the conventional ethylene cracking tar hydrogenation process.

The technical scheme of the invention is realized by the following measures: a start-up oil feeding method of a suspension bed hydrogenation device using ethylene cracking tar as a raw material is carried out according to the following method: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, a start-up cycle flow of ethylene cracking tar is firstly carried out on the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, a metal sulfide catalyst is started to be added into the suspension bed reactor, after the required metal sulfide catalyst is added, hydrogen is input into the suspension bed reactor, and then the ethylene cracking tar is hydrogenated and produced according to a conventional ethylene cracking tar hydrogenation method.

The following is further optimization or/and improvement of the technical scheme of the invention:

the mass ratio of the metal sulfide catalyst to the ethylene cracking tar is 0.0001:1 to 1: 19.

Compared with the method for hydrogenating the ethylene cracking tar disclosed in the Chinese patent application with the publication number of CN112391200A, the method for hydrogenating the ethylene cracking tar only changes the mode of feeding oil and feeding a catalyst, the method for hydrogenating the ethylene cracking tar changes the mode of feeding the catalyst, the catalyst is not fed into a suspension bed reactor when the temperature in the suspension bed reactor is below 300 ℃, the catalyst is fed into the suspension bed hydrogenation device, when the temperature at the inlet of the suspension bed reactor is higher than 300 ℃, a large amount of foam is not generated in the suspension bed reactor, the coking phenomenon is not generated in the suspension bed reactor, the device stably operates, and at the moment, the suspension bed reactor starts to be heated to the reaction temperature to obtain a qualified reaction product.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemicals mentioned in the present invention are all well known and commonly used in the art, unless otherwise specified.

The invention is further described below with reference to the following examples:

example 1: the start-up oil feeding method of the suspension bed hydrogenation device using ethylene cracking tar as the raw material is carried out according to the following method: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, a start-up cycle flow of ethylene cracking tar is firstly carried out on the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, a metal sulfide catalyst is started to be added into the suspension bed reactor, after the required metal sulfide catalyst is added, hydrogen is input into the suspension bed reactor, and then the ethylene cracking tar is hydrogenated and produced according to a conventional ethylene cracking tar hydrogenation method.

Compared with the method for hydrogenating the ethylene cracking tar disclosed in the Chinese patent application with the publication number of CN112391200A, the method for hydrogenating the ethylene cracking tar only changes the mode of feeding oil and feeding a catalyst, the method for hydrogenating the ethylene cracking tar changes the mode of feeding the catalyst, the catalyst is not fed into a suspension bed reactor when the temperature in the suspension bed reactor is below 300 ℃, the catalyst is fed into the suspension bed hydrogenation device, when the temperature at the inlet of the suspension bed reactor is higher than 300 ℃, a large amount of foam is not generated in the suspension bed reactor, the coking phenomenon is not generated in the suspension bed reactor, the device stably operates, and at the moment, the suspension bed reactor starts to be heated to the reaction temperature to obtain a qualified reaction product.

Example 2: as optimization of example 1, the mass ratio of the metal sulfide catalyst to the ethylene pyrolysis tar was 0.0001:1 to 1: 19.

Example 3: the start-up oil feeding method of the suspension bed hydrogenation device using ethylene cracking tar as the raw material is carried out according to the following method: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, firstly, performing start-up circulation flow of ethylene cracking tar in the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, adding a metal sulfide catalyst into the suspension bed reactor, wherein the mass ratio of the metal sulfide catalyst to the ethylene cracking tar is 0.0001:1, after the required metal sulfide catalyst is added, inputting hydrogen into the suspension bed reactor, and subsequently performing hydrogenation production of the ethylene cracking tar according to a conventional ethylene cracking tar hydrogenation method.

Example 4: the start-up oil feeding method of the suspension bed hydrogenation device using ethylene cracking tar as the raw material is carried out according to the following method: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, firstly, performing start-up circulation flow of ethylene cracking tar on the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, adding a metal sulfide catalyst into the suspension bed reactor, wherein the mass ratio of the metal sulfide catalyst to the ethylene cracking tar is 1:19, after the required metal sulfide catalyst is added, inputting hydrogen into the suspension bed reactor, and subsequently, performing hydrogenation production of the ethylene cracking tar according to a conventional ethylene cracking tar hydrogenation method.

Example 5: the start-up oil feeding method of the suspension bed hydrogenation device using ethylene cracking tar as the raw material is carried out according to the following method: when the internal temperature of a suspension bed reactor of the suspension bed hydrogenation device is below 300 ℃, firstly, performing start-up circulation flow of ethylene cracking tar in the suspension bed hydrogenation device, when the internal temperature of the suspension bed reactor is higher than 300 ℃, adding a metal sulfide catalyst into the suspension bed reactor, wherein the mass ratio of the metal sulfide catalyst to the ethylene cracking tar is 0.001:13, after the required metal sulfide catalyst is added, inputting hydrogen into the suspension bed reactor, and subsequently, performing hydrogenation production of the ethylene cracking tar according to a conventional ethylene cracking tar hydrogenation method.

According to the start-up oil feeding method of the embodiments 3 to 5, a large amount of foam is not generated in the suspension bed reactor, the coking phenomenon does not occur in the suspension bed reactor, and the suspension bed hydrogenation device stably operates.

The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.