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Method for preparing alpha-olefin by cracking coal wax

A technology for coal wax and olefin, which is applied in the direction of hydrocarbon cracking, cracking, non-catalytic thermal cracking, etc., can solve the problem of low utilization rate of coal wax and achieve the effect of improving comprehensive utilization value

Inactive Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the utilization rate of coal liquefaction product coal wax is not high in the prior art, and a method for producing α-olefins by cracking coal wax is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw coal wax contains 10.5% oil and 51.31% normal paraffin. After being vaporized by the vaporizer, it is mixed with diluted water vapor (water-to-wax ratio is 0.16) and sent to the preheating furnace for preheating to 540°C, and then the entering temperature is 660°C. In the high-temperature cracking furnace, a high-temperature steam cracking reaction occurs, the residence time is 3.7 seconds, and the outlet pressure is 0.1 MPa. After the cracking products are separated, the single-pass conversion rate of raw material coal wax is 71%, and the yield of liquid olefin is 56.4%. The content of α-olefins and total olefins in olefins reaches 61.5% and 76.3%. The total olefins also include olefins other than α-olefins, in which the double bond is not in the α position.

Embodiment 2

[0021] The raw material coal wax contains 1.4% oil and 84.10% normal paraffin. After being vaporized by the vaporizer, it is mixed with dilute water vapor (water-to-wax ratio is 0.16) and sent to the preheating furnace to preheat to 540°C, and then enter the temperature at 670°C. In the high-temperature cracking furnace, a high-temperature steam cracking reaction occurs, the residence time is 2.5 seconds, and the outlet pressure is 0.1 MPa. After the cracking products are separated, the single-pass conversion rate of raw material coal wax is 62.6%, and the yield of liquid olefin is 43.1%. The content of α-olefins and total olefins in olefins reaches 65.9% and 77.8%.

Embodiment 3

[0023] The raw material coal wax contains 3.2% oil and 84.57% normal paraffin. After being vaporized by the vaporizer, it is mixed with dilute water vapor (water-to-wax ratio is 0.16) and sent to the preheating furnace to preheat to 540°C, and then enter the temperature at 670°C. In the high-temperature cracking furnace, a high-temperature steam cracking reaction occurs, the residence time is 2.5 seconds, and the outlet pressure is 0.1 MPa. After the cracking products are separated, the single-pass conversion rate of raw material coal wax is 64.4%, and the yield of liquid olefin is 48.2%. The content of α-olefins and total olefins in olefins reaches 63.0% and 73.6%.

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Abstract

The invention relates to a method for preparing alpha-olefin by cracking coal wax, and mainly solves a problem of low utilization rate of a coal liquefaction product coal wax in the prior art. The method comprises the following steps: carrying out thermal cracking on the raw material coal wax at 600-900DEG C under 0.1-0.5MPa with water vapor as a diluent gas, a weight ratio of the water vapor to the coal wax of 0.1-5 and a stay time of 0.1-0.5s to generate material flow containing alpha-olefin; and carrying out gas-liquid separation on the material flow containing alpha-olefin, and distilling to obtain alpha-olefin. The above technical scheme well solves the problem, and the method can be used for the industrial production of alpha-olefin through cracking the coal wax.

Description

technical field [0001] The invention relates to a method for producing α-olefins by cracking coal wax. Background technique [0002] As an important chemical raw material and intermediate, α-olefins are widely used. Research institutions and manufacturers at home and abroad have done a lot of research on the production process of α-olefins. At present, the production processes of α-olefins that have been put into industrialization mainly include paraffin cracking and ethylene oligomerization. For example document CN1080944 just discloses a kind of production method that takes paraffin wax as raw material through thermal cracking to produce α-olefin, and raw material wax is cracked in cracking zone after two times of mixing vaporization with superheated steam, preheating, and cracking gas is quenched, separated, Distillation to obtain α-olefin products, characterized in that the cracking depth coefficient (CSF) of the process is greater than 0.90; paraffin and secondary supe...

Claims

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Application Information

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IPC IPC(8): C10G9/00C07C4/04C07C11/02
Inventor 沈本贤于小桥刘纪昌俞巧珍孙辉刘磊郑金花
Owner CHINA PETROLEUM & CHEM CORP