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Method for producing low-carbon olefins by cracking petroleum hydrocarbon

A technology for low-carbon olefins and petroleum hydrocarbons, which is used in hydrocarbon cracking to produce hydrocarbons, petroleum industry, cracking, etc. It can solve the problems of increased raw material consumption, loss of isoparaffin and naphthenic components, etc. Selective and comprehensive energy consumption reduction effect

Active Publication Date: 2013-02-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even for high-quality naphtha cracking raw materials, they only contain about 27% normal paraffins, and the adsorption separation will lose a large amount of isoparaffins and naphthenes components with better cracking performance, so that the raw materials The consumption has increased significantly, and sufficient naphtha resources are needed to ensure the production capacity of ethylene

Method used

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  • Method for producing low-carbon olefins by cracking petroleum hydrocarbon
  • Method for producing low-carbon olefins by cracking petroleum hydrocarbon
  • Method for producing low-carbon olefins by cracking petroleum hydrocarbon

Examples

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Embodiment 1

[0049] by figure 1 As an example to illustrate the method of the present invention, C 4 ~C 15 The hydrocarbon naphtha is introduced into the pre-separation process and separated by solvent extraction. Select sulfolane as the solvent, the mass ratio of the solvent to the feed is 5, the water content of the solvent is 0.8%, the pressure of the extraction tower is 0.6MPa, the temperature at the top of the tower is 70°C, and the mass ratio of the reflux to the feed is 0.1; The pressure is 0.2MPa, the temperature at the top of the tower is 112°C, and the temperature at the bottom of the tower is 170°C; the pressure of the recovery tower is 0.045MPa, the temperature at the top of the tower is 70°C, the temperature at the bottom of the tower is 165°C, and the reflux ratio is 0.5. The petroleum hydrocarbon stream a with aromatics content of 1.82% and the petroleum hydrocarbon mixture b with 99.98% aromatics content obtained after separation, the group composition and BMCI value of e...

Embodiment 2

[0057] by figure 2 As an example to illustrate the method of the present invention, the C 4 ~C 15 Petroleum hydrocarbon cracking raw materials of hydrocarbons are introduced into the aromatics separation process together with pyrolysis gasoline, and separated by extractive distillation. Sulfolane is selected as the solvent, the solvent ratio is 3, the water content of the solvent is 0.8%, the pressure at the top of the extractive distillation tower is 0.12Mpa, the temperature at the top of the tower is 102°C, the temperature at the bottom of the tower is 171°C, and the reflux ratio is 0.65; The pressure is 0.04MPa, the temperature at the top of the tower is 65°C, the temperature at the bottom of the tower is 168°C, and the reflux ratio is 0.9. After separation, the petroleum hydrocarbon stream m with aromatics content of 2% and the petroleum hydrocarbon mixture s with aromatics content higher than 99.99% obtained after separation, the group composition and BMCI value of eac...

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Abstract

The invention discloses a method for producing low-carbon olefins by cracking petroleum hydrocarbon, which comprises the steps of: taking a hydrocarbon mixture with carbon atom number less than or equal to that of C35 hydrocarbon as a cracking raw material, and introducing the hydrocarbon mixture into a pre-separation working procedure to obtain a material flow rich in aromatic hydrocarbon and a petroleum hydrocarbon material flow poor in the aromatic hydrocarbon; then introducing the petroleum hydrocarbon material flow poor in the aromatic hydrocarbon into a cracking working procedure for a cracking reaction to obtain a hydrocarbon mixture containing H2 and C2-C4 olefins; and then separating the material flow rich in the aromatic hydrocarbon to obtain an aromatic hydrocarbon product. Themethod not only can improve the yield of total aromatic hydrocarbon while effectively improving the yield of the low-carbon olefins, but also effectively reduces the energy consumption, operation cost, equipment investment and the like of ethylene production devices.

Description

technical field [0001] The invention relates to a method for cracking petroleum hydrocarbons to produce low-carbon olefins, in particular to a method for increasing the yield of low-carbon olefins and aromatics produced by cracking petroleum hydrocarbons. Background technique [0002] At present, the most common method of producing light olefins such as ethylene, propylene and butadiene from petroleum hydrocarbons is steam cracking. According to statistics, currently about 99% of ethylene and more than 50% of propylene in the world are produced by this method. Due to the steam cracking method, it has been operated under very harsh conditions. For example, the final temperature of the furnace tube in the radiant section of the cracking furnace reaches or exceeds 1125°C, and the residence time of the material in the radiant section is shortened to 0.2s or even shorter. , Therefore, under the current technical level, the possibility of further increasing the yield of low-carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/04C10G9/00
Inventor 王国清张勇张兆斌李东风郭莹张利军程建民刘智信
Owner CHINA PETROLEUM & CHEM CORP
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