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Separation method of Fischer-tropsch synthesized crude product

A Fischer-Tropsch synthesis and separation method technology, used in the separation of solvent oil and wax, the production of LPG by Fischer-Tropsch synthesis crude products, and the fields of various alkanes. Added value, simple process flow, avoiding the effect of excessive light weight

Active Publication Date: 2017-11-07
SEDIN ENG
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Problems solved by technology

[0006] Chinese patent CN 104673383 discloses a method for producing high melting point wax from Fischer-Tropsch synthesis products. The raw material stream first enters the first distillation unit, evaporates at a certain temperature and pressure, and divides the raw material stream into a wax oil distillate stream and a heavy distillate stream; The heavy distillate stream enters the second distillation unit and evaporates at a certain temperature and pressure, and the heavy distillate stream is divided into a medium wax stream and a high melting point wax stream; the high melting point wax stream and the hydrogen stream enter the hydrofining unit, and the high melting point wax stream after hydrogenation The melting point wax is divided into two streams: the first stream and the hydrogenated high melting point wax stream; the hydrogenated high melting point wax stream enters the third distillation unit and evaporates at a certain temperature and pressure, and the hydrogenated high melting point wax stream is divided into the first high melting point wax stream. Wax stream and the second highest melting point wax stream, but the patent directly uses the obtained wax oil as a product, and does not refine the wax oil, so that the added value of the wax oil product is not large
This method does not need to go through the steps of removing impurities such as sulfur, nitrogen, and aromatic hydrocarbons, and directly removes the metal catalysts entrained in the Fischer-Tropsch synthesis crude wax, and then performs hydrofining treatment, and the light wax in the obtained hydrofinishing product is synthesized. The microcrystalline wax with low oil content and less sulfur, nitrogen, oxygen, and metal impurities can be obtained by separating them. The patent still adopts the vacuum distillation method, which may easily lead to the quality of the wax obtained after removing light components. not tall
[0007] The above-mentioned related patents either obtain lubricating oil, base oil and mixed wax products without refining the wax; or obtain three different types of high melting point wax products and mixed wax oil without refining the wax oil; currently there is no It is a process for obtaining a variety of high value-added products from Fischer-Tropsch synthetic oil by "squeezing it dry". Therefore, under the current market conditions, it is urgent to develop a process for the fine separation of Fischer-Tropsch synthetic crude oil to produce various products. craft

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Embodiment 1

[0048] A kind of separation process of Fischer-Tropsch synthesis crude product, technological process is as figure 1 As shown, the raw material is a high-temperature (130° C.) cobalt-based Fischer-Tropsch synthetic crude oil. The mass fractions of each part of the crude oil are: non-condensable gas 22.06%, normal paraffins 75.71%, isoparaffins 1.69%, olefins 0.52%, Alcohol 0.02%, no sulfur, nitrogen and other impurities in the crude oil, adopt the following separation steps and conditions:

[0049] (1) Coarse separation of raw materials

[0050] The crude product of Fischer-Tropsch synthesis first enters gas removal tower 1, and CO and H are distilled from the top of gas removal tower 1 2 , CO 2 , N 2 、H 2 O, CH 4 , C2 and a small amount of C3, C4 non-condensable gases, the components above C2 are distilled from the bottom of the gas removal tower 1, and the components are sent to the LPG separation tower 2 for separation, and the LPG product is distilled from the top of ...

Embodiment 2

[0085] The raw material is a low-temperature (60°C) cobalt-based Fischer-Tropsch synthetic crude oil. The mass fraction of each part of the crude oil is: non-condensable gas 92.53%, n-alkanes 7.08%, isoparaffins 0.20%, olefins 0.17%, alcohols 0.02%, the separation process parameters are:

[0086] The temperature of the gas removal tower 1 is 355°C and the pressure is 1.9MPa;

[0087] The temperature of the LPG separation tower 2 is 325°C and the pressure is 1.7MPa;

[0088] The temperature of the wax separation tower 3 is 360°C and the pressure is 0.03MPa;

[0089] The catalyst loaded in the oil hydrogenation unit 4 uses alumina-silicon oxide as a carrier, the mass fraction of phosphorus as an auxiliary agent is 5%, the mass fraction of active components tungsten oxide and cerium oxide is 5%, and the mass fraction of alumina is 70%. %, the rest is silicon oxide;

[0090] The reaction pressure of the oil hydrogenation unit is 11-12MPa, the reaction temperature is 320-330°C, ...

Embodiment 3

[0110] The raw material is normal temperature (40°C) synthetic crude oil, the mass fraction of each part of the crude oil is: non-condensable gas 49.73%, n-alkanes 47.03%, isoparaffins 1.32%, olefins 1.81%, alcohols 0.11%. The process parameters are:

[0111] The temperature of the gas removal tower 1 is 350°C and the pressure is 2.1MPa;

[0112] The temperature of the LPG separation tower 2 is 330°C and the pressure is 1.9MPa;

[0113] The temperature of the wax separation tower 3 is 355°C and the pressure is 0.025MPa;

[0114] The catalyst loaded in the oil hydrogenation unit 4 uses alumina-silicon oxide as a carrier, the mass fraction of additives fluorine and boron is 3%, the active component tungsten oxide is 1%, and the mass fraction of cerium oxide is 3%. , aluminum oxide is 80%, and the rest is silicon oxide;

[0115] The reaction pressure of the oil hydrogenation unit is 19-20MPa, the reaction temperature is 260-270°C, and the volume space velocity is 10LHSV -1 ; ...

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Abstract

The invention relates to a separation method of a Fischer-tropsch synthesized crude product. The method comprises a plurality of technological steps: crude separation of products, oil hydrogenation, alkane refining, solvent oil refining, wax hydrogenation, wax refining and the like, and according to different synthesis temperatures of the Fischer-tropsch synthesized crude product, different quantities of various high-added-value products such as naphtha, n-pentane, n-heptane, DSP100, DSP40, DSP80 or DSP110 solvent oil, C50, C70 or C80 series wax, H1 and H105 series wax and the like can be obtained. The separation method has the advantages of improving the added value of the Fischer-tropsch synthesized crude product, and being simple in technological flow, and easy for industrial production.

Description

technical field [0001] The invention relates to a method for separating crude products of Fischer-Tropsch synthesis, in particular to a method for separating crude products of Fischer-Tropsch synthesis to produce LPG, various alkanes, solvent oil and wax. Background technique [0002] With the depletion of the world's limited oil resources and the increasing awareness of environmental protection, research and search for environmentally friendly alternatives to oil energy have become one of the directions of world technology development. Coal is converted into oil or other chemical products through the Fischer-Tropsch Synthesis reaction, which can solve the shortage of petroleum resources and meet the demand for energy from the rapid growth of the national economy, so it has developed rapidly. [0003] Fischer-Tropsch synthesis products can be processed to obtain a variety of products with higher added value. CN 101230290 discloses a method for producing solvent oil, lubrica...

Claims

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Application Information

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IPC IPC(8): C10G53/02C10G7/00C10G7/02B01D3/12B01D3/14B01D3/32
CPCB01D3/12B01D3/14B01D3/32C10G7/00C10G7/02C10G53/02C10G2300/1022
Inventor 马英民闫少伟王贵徐婷妹马国强崔晓曦刘建卫
Owner SEDIN ENG
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