阅读说明：本技术 一种裂化汽油的液相加氢处理工艺方法及其采用的装置 (Liquid phase hydrogenation treatment process method for cracked gasoline and device adopted by same ) 是由 贾海龙 杨占辉 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种裂化汽油的液相加氢处理工艺方法及其采用的装置,属于石油化工技术领域。工艺方法,包括：裂化汽油采用热进料,通过裂化汽油切割塔进行分馏,将原料分离为含硫含烯烃轻馏分和重馏分；在混合器内将含硫含烯烃轻馏分与氢气进行预混合；将混合后的含硫含烯烃轻馏分与氢气在液相加氢反应器内进行反应。装置,包括裂化汽油切割塔、混合器及液相加氢反应器；裂化汽油切割塔上部的含硫含烯烃轻馏分出料口同氢气与含硫含烯烃轻馏分混合器的进料口相连通,氢气与含硫含烯烃轻馏分混合器的出料口与液相加氢反应器的进料口相连通。本发明加工流程短、可降低加工复杂性、可节约能源、降低单元加工能耗、可延长装置整体的运行周期。(The invention discloses a liquid phase hydrotreating process method of cracked gasoline and a device adopted by the same, belonging to the technical field of petrochemical industry. The process method comprises the following steps: fractionating the cracked gasoline by a cracked gasoline cutting tower by adopting hot feed, and separating the raw material into a sulfur-containing olefin-containing light fraction and a heavy fraction; premixing the sulfur-containing olefin-containing light fraction with hydrogen in a mixer; and reacting the mixed light fraction containing sulfur and olefin with hydrogen in a liquid phase hydrogenation reactor. The device comprises a cracking gasoline cutting tower, a mixer and a liquid phase hydrogenation reactor; the discharge hole of the sulfur-containing olefin-containing light fraction at the upper part of the cracking gasoline cutting tower is communicated with the feed hole of a hydrogen and sulfur-containing olefin-containing light fraction mixer, and the discharge hole of the hydrogen and sulfur-containing olefin-containing light fraction mixer is communicated with the feed hole of the liquid phase hydrogenation reactor. The invention has short processing flow, can reduce processing complexity, save energy, reduce unit processing energy consumption and prolong the integral operation period of the device.)

1. A liquid phase hydrotreating process method of cracked gasoline is characterized by comprising the following steps:

the method comprises the following steps: the cracked gasoline is pre-cut by adopting hot feeding direct supply,

fractionating the cracked gasoline by a cracked gasoline cutting tower by adopting hot feed, and separating the raw material into a sulfur-containing olefin-containing light fraction and a heavy fraction;

step two: premixing the sulfur-containing olefin-containing light fraction with hydrogen in a hydrogen and sulfur-containing olefin-containing light fraction mixer;

step three: and reacting the mixed light fraction containing sulfur and olefin with hydrogen in a liquid phase hydrogenation reactor to obtain a liquid phase hydrogenation reaction product.

2. The liquid phase hydrogenation processing method for cracked gasoline as claimed in claim 1, characterized in that the catalyst used in step three is a high activity NiCoMoW series hydrogenation catalyst.

3. The liquid phase hydrotreating process for cracked gasoline as claimed in claim 1, characterized in that the reaction conditions of the liquid phase hydrogenation reactor in step three are: the pressure is 1.0-3.0 Mpa, the temperature of a reaction inlet is 60-200 ℃, the temperature rise of the reaction is no more than 30 ℃, and the mol ratio of hydrogen to hydrocarbon is 0.02-0.5.

4. The liquid phase hydrotreating process for cracked gasoline as claimed in claim 1, characterized in that the reaction conditions of the cracked gasoline cutting tower in the first step are: the pressure is 0.2-0.9 Mpa, the temperature at the top of the tower is 40-120 ℃, and the temperature at the bottom of the tower is 100-200 ℃.

5. The apparatus adopted in the liquid phase hydrotreating process for cracked gasoline of claim 1 is characterized by comprising a cracked gasoline cutting tower, a hydrogen and sulfur-containing olefin-containing light fraction mixer and a liquid phase hydrogenation reactor; and a discharge hole of the sulfur-containing and olefin-containing light fraction at the upper part of the cracking gasoline cutting tower is communicated with a feed hole of a hydrogen and sulfur-containing and olefin-containing light fraction mixer, and a discharge hole of the hydrogen and sulfur-containing and olefin-containing light fraction mixer is communicated with a feed hole of a liquid phase hydrogenation reactor.

6. The device adopted by the liquid phase hydrotreating process for cracked gasoline of claim 5 is characterized by further comprising a raw material tank, wherein the feed inlet of the raw material tank is used for receiving cracked gasoline, and the discharge outlet of the raw material tank is communicated with the feed inlet of the cracked gasoline cutting tower.

7. The apparatus for liquid phase hydrogenation treatment of cracked gasoline as defined in claim 5, further comprising a filter, wherein the inlet of said filter is connected to the outlet of said cracked gasoline cutting tower, and the outlet of said filter is connected to the inlet of the mixer for hydrogen and light fraction containing sulfur and olefins.

Technical Field

The invention belongs to the technical field of petrochemical industry, and particularly relates to a liquid phase hydrotreating process method of cracked gasoline and a device adopted by the method.

Background

The cracked gasoline contains a large amount of sulfur-containing compounds, and the method for reducing the sulfur content comprises the following steps: 1. hydrofinishing a whole-distillate feedstock of a cracking or coking unit; 2. the products of these units are hydrofinished. The first option is very costly because of the large hydrogen treatment equipment and the large hydrogen consumption; the second option is a shortcut but leads to olefin saturation, which also reduces the antiknock index (octane number) of the desulfurized gasoline product by 3-20 units. The octane number loss associated with desulfurization is a significant impact on the octane number of the finished gasoline from the refinery. In order to effectively remove the sulfur in the cracked gasoline and maximally retain the octane number of the desulfurized gasoline, the method comprises the steps of improving the catalyst and adopting proper process conditions.

At present, the prior art has complex process flow, high content of dialkene in reaction raw materials, easy coking at high-temperature parts of a reactor, a heat exchanger, a reboiler and the like in a downstream processing section and short operation period of the device.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a liquid phase hydrotreating process method of cracked gasoline and a device adopted by the method, wherein the liquid phase hydrotreating process method has the advantages of short processing flow, capability of reducing processing complexity, energy saving, unit processing energy consumption reduction and capability of prolonging the whole operation period of the device.

In order to achieve the purpose, the invention adopts the following technical scheme: a liquid phase hydrotreating process method of cracked gasoline comprises the following steps:

the method comprises the following steps: the cracked gasoline is pre-cut by adopting hot feeding direct supply,

fractionating the cracked gasoline by a cracked gasoline cutting tower by adopting hot feed, and separating the raw material into a sulfur-containing olefin-containing light fraction and a heavy fraction;

step two: premixing the sulfur-containing olefin-containing light fraction with hydrogen in a hydrogen and sulfur-containing olefin-containing light fraction mixer;

step three: and reacting the mixed light fraction containing sulfur and olefin with hydrogen in a liquid phase hydrogenation reactor to obtain a liquid phase hydrogenation reaction product.

Further, the catalyst adopted in the third step is a high-activity NiCoMoW series hydrogenation catalyst.

Further, the reaction conditions of the liquid phase hydrogenation reactor in the third step are as follows: the pressure is 1.0-3.0 Mpa, the temperature of a reaction inlet is 60-200 ℃, the temperature rise of the reaction is no more than 30 ℃, and the mol ratio of hydrogen to hydrocarbon is 0.02-0.5.

Further, the reaction conditions of the cracked gasoline cutting tower in the first step are as follows: the pressure is 0.2-0.9 Mpa, the temperature at the top of the tower is 40-120 ℃, and the temperature at the bottom of the tower is 100-200 ℃.

The device adopted by the liquid phase hydrotreating process method of the cracked gasoline comprises a cracked gasoline cutting tower, a hydrogen and sulfur-containing olefin-containing light fraction mixer and a liquid phase hydrogenation reactor; and a discharge hole of the sulfur-containing and olefin-containing light fraction at the upper part of the cracking gasoline cutting tower is communicated with a feed hole of a hydrogen and sulfur-containing and olefin-containing light fraction mixer, and a discharge hole of the hydrogen and sulfur-containing and olefin-containing light fraction mixer is communicated with a feed hole of a liquid phase hydrogenation reactor.

The device adopted by the liquid phase hydrotreating process method for the cracked gasoline further comprises a raw material tank, wherein a feed inlet of the raw material tank is used for receiving the cracked gasoline, and a discharge outlet of the raw material tank is communicated with a feed inlet of a cracked gasoline cutting tower.

The device adopted by the liquid phase hydrotreating process method of the cracked gasoline further comprises a filter, wherein a feed inlet of the filter is communicated with a discharge outlet of the cracked gasoline cutting tower, and a discharge outlet of the filter is communicated with a feed inlet of a hydrogen and sulfur-containing olefin-containing light fraction mixer.

The invention has the beneficial effects that:

1. according to the invention, desulfurization and sulfur transfer reactions at low temperature can be realized through the liquid phase hydrogenation reactor, the sulfur content of the light fraction is reduced, and part of sulfur is transferred to the heavy fraction;

2. the invention improves the reaction efficiency through high-efficiency gas-liquid mixing, and simultaneously reserves the antiknock index (octane number) of the light fraction;

3. the invention adopts direct supply of hot feeding, can effectively utilize waste heat, save energy and reduce the energy consumption of unit processing;

4. the invention has short processing flow and can reduce the processing complexity;

5. the device can also be used in series or in parallel with other cracked gasoline hydrogenation devices, so that the operation period of the cracked gasoline hydrogenation devices is prolonged, and the effective processing amount of the device is increased;

6. the invention can remove the alkadiene to the level of 2-100 ppm, and prolongs the whole operation period of the device.

The experiment proves that the reaction effect (the reaction effect of the reaction product relative to the reaction raw material) of the invention is as follows:

RON loss is not more than 0.2;

the transfer rate of sulfur from the light fraction to the heavy fraction is not less than 90% (mol ratio) when the yield of the light fraction is not less than 40%;

the diene saturation ratio is not less than 98% (mol ratio).

Drawings

FIG. 1 is a schematic diagram showing the structure of one embodiment of an apparatus used in the process for the liquid-phase hydrotreatment of a cracked gasoline according to the present invention;

in the figure: 1-cracking gasoline cutting tower, 2-hydrogen and sulfur-containing olefin light fraction mixer, 3-liquid phase hydrogenation reactor;

material 1-cracked gasoline, material 2-sulfur-containing olefin-containing light fraction, material 3-heavy fraction, material 4-hydrogen, material 5-liquid-phase hydrogenation mixed feeding material and material 6-liquid-phase hydrogenation reaction product.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

A liquid phase hydrotreating process method of cracked gasoline comprises the following steps:

the method comprises the following steps: the cracked gasoline is pre-cut by adopting hot feeding direct supply,

fractionating the cracked gasoline by a cracked gasoline cutting tower 1 by adopting hot feed, separating the raw material into a sulfur-containing olefin-containing light fraction and a heavy fraction, and independently utilizing the sulfur-containing olefin-containing light fraction in the cracked gasoline; the reaction conditions of the cracked gasoline cutting tower 1 are as follows: the pressure is 0.2-0.9 Mpa (gauge pressure), the tower top temperature is 40-120 ℃, and the tower bottom temperature is 100-200 ℃;

step two: premixing the sulfur-containing olefin-containing light fraction and hydrogen in a hydrogen and sulfur-containing olefin-containing light fraction mixer 2 to realize high-efficiency mixing of reaction raw materials;

step three: carrying out olefin saturation reduction reaction on the mixed sulfur-containing olefin-containing light fraction and hydrogen in a liquid phase hydrogenation reactor 3, and keeping the octane number in the light fraction to obtain a liquid phase hydrogenation reaction product; the adopted catalyst is a high-activity NiCoMoW series hydrogenation catalyst, and the reaction conditions are as follows: the pressure is 1.0-3.0 MPa (gauge pressure), the temperature of a reaction inlet is 60-200 ℃ (adjustable), the reaction temperature rise is no more than 30 ℃, and the mol ratio of hydrogen to hydrocarbon is 0.02-0.5.

The direct supply of hot feed means that the product cracked gasoline of the upstream equipment directly enters the cracked gasoline cutting tower 1 of the invention without being cooled, so that the waste heat can be effectively utilized, and the energy is saved.

The raw materials comprise secondary processing oil such as thermal cracking gasoline, catalytic cracking gasoline and the like, and are particularly suitable for oil products with high light fraction olefin content and high sulfur content.

As shown in fig. 1, the device adopted by the liquid phase hydrotreating process method for cracked gasoline comprises a cracked gasoline cutting tower 1, a hydrogen and sulfur-containing olefin-containing light fraction mixer 2 and a liquid phase hydrogenation reactor 3; the discharge hole of the sulfur-containing olefin-containing light fraction at the upper part of the cracking gasoline cutting tower 1 is communicated with the feed hole of the hydrogen and sulfur-containing olefin-containing light fraction mixer 2, and the discharge hole of the hydrogen and sulfur-containing olefin-containing light fraction mixer 2 is communicated with the feed hole of the liquid phase hydrogenation reactor 3.

The sulfur-containing olefin-containing light fraction mixer 2 can adopt the devices which are patented by the inventor of the patent application: chinese patent No. 201920404208.8, "high efficiency gas-liquid mixing equipment".

The device adopted by the liquid phase hydrotreating process method of the cracked gasoline further comprises a raw material tank, wherein a feed inlet of the raw material tank is used for receiving the cracked gasoline, a discharge outlet of the raw material tank is communicated with a feed inlet of the cracked gasoline cutting tower 1, and the raw material tank plays a role in buffering.

The device adopted by the liquid phase hydrotreating process method of the cracked gasoline also comprises a filter, wherein a feed inlet of the filter is communicated with a discharge outlet of the cracked gasoline cutting tower 1, a discharge outlet of the filter is communicated with a feed inlet of a hydrogen and sulfur-containing olefin-containing light fraction mixer 2, and the filter is mainly used for carrying out off-line mechanical impurity on raw materials.

The cracking gasoline cutting tower 1, the hydrogen and sulfur-containing olefin-containing light fraction mixer 2 and the liquid phase hydrogenation reactor 3 are all in the prior art, and the cutting tower is also called a fractionating tower and plays a role in cutting and fractionating components.

Still other ancillary equipment, including transfer and booster pumps and heat exchange equipment, exist substantially throughout the process flow, are non-core equipment at each step, and are conventional equipment in refinery production; the conveying and booster pump plays a role in conveying fluid, and the heat exchange equipment plays a role in recovering heat.