Method for evaluating thermal cracking starting temperature of heavy oil product

A technology of starting temperature and pyrolysis, which is applied in the direction of material inspection, weighing by removing certain components, and analysis by electron paramagnetic resonance, etc. It can solve bond breaking reaction, advance breaking temperature, calculate or predict heavy Problems such as the deviation of decomposition temperature of high-quality oil products, etc., to achieve the effect of simple and easy method

Pending Publication Date: 2020-08-25
BEIJING UNIV OF CHEM TECH
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  • Claims
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Problems solved by technology

When heavy oils are thermally cracked, there is also an induction reaction of free radicals, that is, weak covalent bonds with lower bond energy are broken to form free radical molecular fragments, and these free radical molecular fragments will induce other strong bond energy. Covalent bond breaking, this induction often makes the covalent bond breaking temperature with stronger bond energy earlier, and the bond breaking reaction occurs at a lower temperature, so the calculation or prediction of heavy oil products from the perspective of covalent bond energy There is a certain deviation in the decomposition temperature

Method used

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  • Method for evaluating thermal cracking starting temperature of heavy oil product
  • Method for evaluating thermal cracking starting temperature of heavy oil product

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Experimental program
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Effect test

Embodiment 1

[0016] 1 kind of Venezuelan heavy crude oil, 4 kinds of atmospheric residues and 2 kinds of vacuum residues were tested for free radicals, 7 kinds of heavy oils were heated to 70±5°C under an inert atmosphere, and an open glass with an inner diameter of 2mm was used to measure the free radicals. Dip 10mg of the tubes respectively, and put the glass tube containing the oil to be tested into the paramagnetic tube to measure the concentration of free radicals. At the same time, use an open glass tube with an inner diameter of 2 mm to pick up 10 mg of heavy oil respectively, put the glass tube containing the oil to be tested into the thermogravimetry-mass spectrometry system, and heat it under an argon atmosphere with a heating rate of 5 °C / min. The test results are shown in Table 1.

[0017] Table 1 Test results of seven kinds of petroleum heavy oil

[0018]

Embodiment 2

[0020] One rubber cracking tar and two coal tars were tested for free radicals, the method was the same as in Example 1, and the results are shown in Table 2.

[0021] Table 2 Test results of three kinds of tars

[0022]

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PUM

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Abstract

The invention discloses a method for determining the thermal cracking starting temperature of a heavy oil product. The thermal cracking starting temperature of the heavy oil product is determined according to the concentration of free radicals in the heavy oil product. The method provided by the invention is suitable for evaluating aromatic hydrocarbon-rich heavy oil products such as heavy petroleum crude oil, atmospheric and vacuum residuum, coal tar, waste rubber thermal cracking tar and the like. The method has the advantages of being simple and easy to implement, and the thermal cracking initial temperature of the oil product can be judged only by measuring the concentration of the free radicals in the heavy oil product. And while the experiment time is saved and the experiment cost isreduced, the damage to the chemical structure of the oil product caused by heating in the conventional determination method is also avoided.

Description

technical field [0001] The invention relates to a method for determining the thermal cracking initiation temperature of a heavy oil by utilizing the free radical concentration contained in the heavy oil itself. Background technique [0002] Inferior and heavy oil resources are the future development trend of the world's crude oil. According to statistics, the world's proven reserves of unconventional oil resources such as heavy oil and oil sand bitumen have reached 1 trillion cubic meters. Due to the high viscosity, it is difficult to transport by pipelines. These unconventional crude oils need to be processed in the oil field to make them meet the feedstock oil of conventional refineries. At the same time, the distillate oil directly obtained from crude oil, including gasoline, diesel oil, etc., accounts for about 30-60% of the crude oil. After vacuum distillation, there will still be about 10-30% residual oil at the bottom of the tower. Since the amount of gasoline and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28G01N24/10G01N27/62G01N5/04
CPCG01N33/28G01N24/10G01N27/62G01N5/04
Inventor 石磊赵文涛刘浅刘振宇刘清雅
Owner BEIJING UNIV OF CHEM TECH
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