Process for cracking synthetic crude oil-containing feedstock

A technology for synthesizing crude oil and raw materials, which is applied in the processing of hydrocarbon oil, petroleum industry, hydrocarbons, etc., and can solve problems such as difficult cracker operability, low coil outlet temperature, and low conversion rate

Active Publication Date: 2009-11-18
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional synthetic crude oils (which are hydroprocessed mixtures of residual-free straight-run liquids from atmospheric or vacuum tube furnaces) combined with thermal cracking products may show operational limitations in crackers. difficulty
Such difficulties include low coil exit temperatures, low conversion and high coking in the radiant and quench sections of the cracking furnace

Method used

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  • Process for cracking synthetic crude oil-containing feedstock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Engineering calculations (COMPASS) were carried out (which simulated synthetic crude oil alone and mixtures of synthetic crude oil with HAGO according to the invention) and compared with actual laboratory results. The reaction conditions include a reactor temperature of 725° C. (measured at the coil outlet), a reactor pressure of 50 kPag, a steam / hydrocarbon ratio of 0.30, a severity of 1.5 (C3= / C1, the weight ratio of propylene / methane) and a 1.6 Selectivity (C2= / C1, ie the weight ratio of ethylene / methane). Cracking of Sincor and Syncrude 319 alone, or in combination with a heavy aromatic gas oil (75 parts synthetic crude oil / 25 parts HAGO) in an industrial scale furnace as described above showed a 2 wt% increase in ethylene yield, irradiated A 10 wt% reduction in quench coke formation and a 125°F increase in optimum coil outlet temperature.

Embodiment 2

[0068] Example 1 was repeated except that HAGO was replaced with a high pour hydrocracked product having a pour point of 110°F. The synthetic crudes Sincor and Syncrude 319 exhibit a low pour point of -12°F. The results showed a 2 wt% increase in ethylene yield, a 10 wt% reduction in radiant / quench coke formation and a 125°F increase in optimum coil outlet temperature. The low pour Syncrude / high pour hydrocracked product mixtures exhibit a relatively low pour point of 80°F, which makes them suitable for use without heated tanks or lines.

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Abstract

A process for steam cracking liquid hydrocarbon feedstocks containing synthetic crude oil comprises i) hydroprocessing a wide boiling range aliquot containing a) normally liquid hydrocarbon portion substantially free of resids and b) thermally cracked hydrocarbon liquid, boiling in a range from 600 DEG F to 1050 DEG F, to provide a synthetic crude oil substantially free of resids; ii) adding to the synthetic crude oil a normally liquid hydrocarbon component boiling in a range from 100 DEG F to 1050 DEG F; and iii) cracking the mixture resulting from ii) in a cracker furnace comprising a radiantcoil outlet to provide a cracked effluent, wherein the cracking is carried out under conditions sufficient to effect a radiant coil outlet temperature which is greater than the optimum radiant coil outlet temperature for cracking the synthetic crude oil separately. A method for upgrading synthetic crude for use in cracking is also provided, as well as a feedstock for cracking.

Description

technical field [0001] The present invention relates to a method of processing gaseous effluents from a hydrocarbon pyrolysis plant capable of using heavy feedstocks, such as feedstocks containing synthetic crude oils, and a method of upgrading synthetic crude oils. Background technique [0002] Steam cracking, also known as pyrolysis, has long been used to crack various hydrocarbon feedstocks into olefins, preferably light olefins such as ethylene, propylene and butenes. Conventional steam cracking employs a cracking furnace with two main sections: a convective section and a radiant section. The hydrocarbon feed generally enters the convection section of the furnace as a liquid (except for light feeds which enter as steam), where it is heated and vaporized, generally by indirect contact with hot flue gas from the radiant section and by direct contact with steam. The vaporized feedstock and steam mixture is then introduced into the radiant section where cracking occurs. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/06
CPCY10S585/921C10G69/06
Inventor P·F·科伊森科滕J·N·麦科伊J·E·格雷厄姆C·D·赖曼
Owner EXXONMOBIL CHEM PAT INC
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