阅读说明：本技术 一种柴油及其连续生产方法 (Diesel oil and continuous production method thereof ) 是由 林荣兴 张宇 黄存超 徐亚明 刘海龙 张俊玲 于 2020-03-26 设计创作，主要内容包括：本发明提供一种柴油及其连续生产方法,该柴油闭口闪点≥110℃；柴油的馏程是：10％v馏出温度≥260℃,50％v馏出温度≤300℃,90％v馏出温度≤320℃。该柴油的连续生产方法,包括如下步骤：1)将氮含量≤1700mg/kg、氯含量＜2mg/kg和铁含量＜1mg/kg的减压馏份油进行加氢,得到加氢油品；2)将加氢油品进行分馏得到润滑油馏份；3)将润滑油馏份进行分馏,得到该柴油；其中,柴油抽出温度为160～170℃。本发明将减压馏份油进行加氢得到加氢油品,加氢油品进行分馏得到润滑油馏份,润滑油馏份再进行分馏得到柴油,柴油具有柴油特性和基础油的特性,十六烷值高于国VI柴油,低温性能好。(The invention provides diesel oil and a continuous production method thereof, wherein the closed flash point of the diesel oil is more than or equal to 110 ℃; the distillation range of diesel oil is: the 10% v distillation temperature is more than or equal to 260 ℃, the 50% v distillation temperature is less than or equal to 300 ℃, and the 90% v distillation temperature is less than or equal to 320 ℃. The continuous production method of the diesel oil comprises the following steps: 1) hydrogenating the reduced pressure distillate oil with the nitrogen content of less than or equal to 1700mg/kg, the chlorine content of less than 2mg/kg and the iron content of less than 1mg/kg to obtain a hydrogenated oil product; 2) fractionating the hydrogenated oil product to obtain a lubricating oil fraction; 3) fractionating the lubricating oil fraction to obtain the diesel oil; wherein the extraction temperature of the diesel oil is 160-170 ℃. The invention hydrogenates the vacuum distillate oil to obtain hydrogenated oil product, fractionates the hydrogenated oil product to obtain lubricating oil distillate, fractionates the lubricating oil distillate to obtain diesel oil, the diesel oil has the characteristics of diesel oil and base oil, the cetane number is higher than that of national VI diesel oil, and the low-temperature performance is good.)

1. The diesel oil is characterized in that the closed flash point of the diesel oil is more than or equal to 110 ℃; the distillation range of the diesel oil is as follows: the 10% v distillation temperature is more than or equal to 260 ℃, the 50% v distillation temperature is less than or equal to 300 ℃, and the 90% v distillation temperature is less than or equal to 320 ℃.

2. A continuous process for the production of diesel fuel according to claim 1, characterized in that it comprises the following steps:

1) carrying out hydrogenation reaction on reduced pressure distillate oil with the nitrogen content of not more than 1700mg/kg, the chlorine content of less than 2mg/kg and the iron content of less than 1mg/kg to obtain a hydrogenated oil product;

2) fractionating the hydrogenated oil product obtained in the step 1) to obtain naphtha, kerosene and lubricating oil fractions;

3) fractionating the lubricating oil fraction obtained in the step 2) to obtain the diesel oil, the light lubricating oil, the medium lubricating oil, the heavy lubricating oil and the bottom-reducing lubricating oil; wherein the extraction temperature of the diesel oil is 160-170 ℃.

3. The continuous production method of diesel oil according to claim 2, wherein in the step 1), the reaction pressure is 13.5 to 14.5 MPa.

4. The continuous production method of diesel oil according to claim 2, wherein the reaction temperature in step 1) is 330 to 380 ℃.

5. The continuous production method of diesel oil according to claim 2, wherein in the step 2), the feeding temperature for fractionating the hydrogenated oil product obtained in the step 1) is 298-305 ℃.

6. The continuous production method of diesel oil according to claim 2, wherein the kerosene extraction temperature in step 2) is 175 to 185 ℃.

7. The continuous production method of diesel oil according to claim 2, wherein in the step 2), the extraction amount of kerosene is 6.7 to 9% of the mass of the vacuum distillate oil in the step 1).

8. The continuous production method of diesel oil according to claim 2, wherein the feed temperature for fractionating the lubricating oil fraction obtained in step 2) in step 3) is 300 to 350 ℃.

9. The continuous production method of diesel oil according to claim 2, wherein in the step 3), the extraction amount of diesel oil is 1.5 to 2.3% of the mass of the vacuum distillate oil in the step 1).

10. The continuous production method of diesel oil according to claim 2, wherein the overhead temperature of the fractionation in step 3) is 90 to 95 ℃.

Technical Field

The invention relates to the technical field of petroleum refining, in particular to diesel oil and a continuous production method thereof.

Background

At present, the production process of national VI diesel oil is a diesel oil hydrogenation process taking diesel oil fractions (straight-run diesel oil and secondary processing diesel oil such as catalytic diesel oil, coking diesel oil and the like) as raw materials and a hydrocracking process taking vacuum distillate oil of crude oil as a raw material; wherein, the diesel hydrogenation process is the mainstream production process; the quality of the hydrocracking diesel oil fraction is far superior to that of the refined diesel oil produced by a diesel oil hydrogenation process, and the quality of the refined diesel oil is switched to non-diesel oil application at present. Thus, diesel products are produced primarily from diesel hydrogenation units.

CN105623705A discloses a method for producing diesel oil and a product diesel oil, wherein the hydrocracking diesel oil fraction with the distillation range of 145-380 ℃ is subjected to first fractionation to obtain a light diesel oil fraction, a medium diesel oil fraction and a heavy diesel oil fraction; taking out at least part of the medium diesel fraction, and separating the light diesel fraction and the heavy diesel fraction or the rest of the medium diesel fraction out of the device to obtain product diesel, wherein the distillation range of the medium diesel fraction is 205-300 ℃; also discloses a product diesel oil produced by the method. The method can economically and flexibly improve the quality of the diesel oil of the existing hydrocracking device, and particularly can reduce the density of the hydrocracking full-fraction diesel oil and improve the cetane number of the product diesel oil at the same time. The diesel oil fraction is rectified and cut to obtain diesel oil with narrow distillation range distribution. The diesel oil fraction is rectified and cut to obtain diesel oil with narrow distillation range distribution.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide diesel oil and a continuous production method thereof, wherein the closed flash point of the diesel oil is more than or equal to 110 ℃; the distillation range of the diesel oil is as follows: the 10% v distillation temperature is more than or equal to 260 ℃, the 50% v distillation temperature is less than or equal to 300 ℃, the 90% v distillation temperature is less than or equal to 320 ℃, the diesel oil has the characteristics of diesel oil and base oil, the cetane number is higher than that of national VI diesel oil, and the low-temperature performance is good.

The invention is realized by the following technical scheme:

the first aspect of the invention provides diesel, wherein the closed flash point of the diesel is more than or equal to 110 ℃; the distillation range of the diesel oil is as follows: the 10% v distillation temperature is more than or equal to 260 ℃, the 50% v distillation temperature is less than or equal to 300 ℃, and the 90% v distillation temperature is less than or equal to 320 ℃.

The second aspect of the present invention provides a continuous production method of the above diesel oil, comprising the steps of:

1) carrying out hydrogenation reaction on the vacuum distillate oil with the nitrogen content of less than or equal to 1700mg/kg, the chlorine content of less than 2mg/kg and the iron content of less than 1mg/kg to obtain a hydrogenated oil product; such as nitrogen content of 647mg/kg or less, 647-700 mg/kg or less, 700-900 mg/kg or less, 900mg/kg or 1700mg/kg or less; the chlorine content is less than 0.5mg/kg or less than 2 mg/kg;

2) fractionating the hydrogenated oil product obtained in the step 1) to obtain naphtha, kerosene and lubricating oil fractions;

3) fractionating the lubricating oil fraction obtained in the step 2) to obtain the diesel oil, the light lubricating oil, the medium lubricating oil, the heavy lubricating oil and the bottom-reducing lubricating oil; wherein the extraction temperature of the diesel oil is 160-170 ℃, such as 160-165 ℃ or 165-170 ℃.

After crude oil enters an atmospheric tower, naphtha, gasoline, aviation kerosene and diesel oil fractions are extracted from a side line, and materials at the bottom of the atmospheric tower enter a vacuum tower; the fraction extracted from the side line of the vacuum tower is vacuum distillate.

Preferably, in the step 1), the reaction pressure is 13.5 to 14.5MPa, such as 13.5 to 14.5MPa or 13.5 to 14.5 MPa.

Preferably, in the step 1), the reaction temperature is 330-380 ℃, such as 330-350 ℃ or 350-380 ℃.

Preferably, in the step 2), the feeding temperature for fractionating the hydrogenated oil product obtained in the step 1) is 298-305 ℃, such as 298-302 ℃ or 302-305 ℃.

Preferably, in the step 2), the extraction temperature of the kerosene is 175-185 ℃, such as 175-180 ℃ or 180-185 ℃.

Preferably, in the step 2), the extraction amount of the kerosene is 6.7-9% of the mass of the vacuum distillation oil in the step 1), such as 6.7-7.8% or 7.8-9%.

Preferably, in the step 3), the feeding temperature for fractionating the lubricating oil fraction obtained in the step 2) is 300-350 ℃, such as 300-320 ℃ or 320-350 ℃.

Preferably, in the step 3), the extraction amount of the diesel oil is 1.5-2.3% of the mass of the vacuum distillate oil in the step 1), such as 1.5-2% or 2-2.3%.

Preferably, in step 3), the temperature at the top of the fractionating tower is 90-95 deg.C, such as 90-92 deg.C or 92-95 deg.C.

The invention hydrogenates the reduced pressure distillate oil to obtain lubricating oil fraction, and then fractionates to obtain the diesel oil, wherein the closed flash point of the diesel oil is more than or equal to 110 ℃; the distillation range of the diesel oil is as follows: the 10% v distillation temperature is more than or equal to 260 ℃, the 50% v distillation temperature is less than or equal to 300 ℃, and the 90% v distillation temperature is less than or equal to 320 ℃, wherein the diesel oil not only has the diesel oil characteristic, but also has the cetane number higher than that of national VI diesel oil; but also has the characteristics of base oil: high closed flash point, low condensation point, low cold filter plugging point and the like, and the oil product has good low-temperature performance.

Drawings

FIG. 1 is a flow chart of a continuous process for producing diesel fuel according to the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.