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A kind of method of producing light olefins by Fischer-Tropsch synthetic oil

A technology of Fischer-Tropsch synthetic oil and low-carbon olefins, applied in the field of production of low-carbon olefins, can solve the problems of poor low-temperature fluidity and high freezing point, and achieve the effect of reducing the content

Active Publication Date: 2017-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its diesel fraction has a high cetane number, but its low-temperature fluidity is poor and its freezing point is high. It is generally used as a diesel blending component

Method used

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  • A kind of method of producing light olefins by Fischer-Tropsch synthetic oil
  • A kind of method of producing light olefins by Fischer-Tropsch synthetic oil
  • A kind of method of producing light olefins by Fischer-Tropsch synthetic oil

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This example is used to illustrate the method for producing light olefins from Fischer-Tropsch synthetic oil provided by the present invention.

[0037] A medium-sized device with continuous reaction-regeneration operation is used for experiments. The reactor in the first reaction zone is a fixed-bed reactor, and the reactant flow after passing through the first reaction zone enters the reactor in the second reaction zone. The inner diameter of the fixed-bed reactor is It is 30 millimeters, and height is 6 meters; The reactor of the second reaction zone is a fluidized bed reactor, and the internal diameter of fluidized bed reactor is 160 millimeters, and height is 0.6 meters.

[0038] Fischer-Tropsch synthetic distillate A is sprayed into a fixed-bed reactor after being preheated to 300°C. The fixed-bed reactor has a volume of 4.2mL and is filled with 2.8mL of amorphous alumina heat carrier. The regenerated catalyst with a temperature of about 700°C enters the bottom of...

Embodiment 2

[0046] This example is used to illustrate the method for producing light olefins from Fischer-Tropsch synthetic oil provided by the present invention.

[0047] The reaction apparatus that adopts is with embodiment 1. The main experimental steps used are the same as those in Example 1, except that the Fischer-Tropsch synthetic distillate A in Example 1 is replaced by Fischer-Tropsch synthetic distillate B with a higher oxygenate content. The main operating conditions and results are listed in Table 3.

Embodiment 3

[0049] This example is used to illustrate the method for producing light olefins from Fischer-Tropsch synthetic oil provided by the present invention.

[0050] The reaction apparatus that adopts is with embodiment 1. The main experimental steps used are the same as those in Example 1, except that no amorphous alumina heat carrier is filled in the fixed-bed reactor.

[0051] table 3

[0052] project Example 1 Comparative example 1 Comparative example 2 Example 2 Example 3 Reactant A A A B A operating conditions first reaction zone Reaction temperature / ℃ 400 - 400 380 400 Response time / second 1 - 2 1 1 Heat carrier Have none none Have none catalyst none none Have none none

[0053] second reaction zone Reaction temperature / ℃ 580 600 590 580 580 Response time / second 10 7 7 10 10 Catalyst to Fischer-Tropsch oil weight ratio...

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Abstract

The invention relates to a method for producing low-carbon olefin from Fischer-Tropsch synthetic oil. The method includes the steps: the Fischer-Tropsch synthetic oil is subjected to a thermal cracking reaction, and the obtained product flow makes contact with a catalytic cracking catalyst and then is subjected to a catalytic cracking reaction. According to the method for producing low-carbon olefin from the Fischer-Tropsch synthetic oil, the yield of the low-carbon olefin can be significantly improved, and moreover, the content of methanol and other oxygenated compounds in cracked gas can be significantly reduced.

Description

technical field [0001] The invention relates to a method for converting Fischer-Tropsch synthetic oil in the absence of hydrogen, in particular to a method for producing light olefins from Fischer-Tropsch synthetic oil. Background technique [0002] With the decreasing reserves of conventional petroleum resources and the rapid increase in consumption, the technology of producing synthetic oil by Fischer-Tropsch synthesis has attracted much attention. Fischer-Tropsch synthetic oil is quite different from natural petroleum in composition. It is a substance mainly composed of alkanes and olefins, and contains a certain amount of oxygen-containing compounds, and the content of sulfur and nitrogen is extremely low. [0003] For the processing and utilization of Fischer-Tropsch synthetic oil, the naphtha fraction has a high content of n-alkanes, resulting in a low octane number, which is not suitable as a blending component of motor gasoline. Generally, it is used as a raw materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/02C07C4/02C07C4/04C07C4/06C10G51/04
Inventor 杨超谢朝钢朱根权
Owner CHINA PETROLEUM & CHEM CORP