Method for improving thermal cracking of heavy oil in sub (ultra) critical water

A technology of heavy oil and critical water, applied in the direction of non-catalytic thermal cracking, cracking, petroleum industry, etc., can solve the problems of no industrial reference, achieve good initiation efficiency, ingenious and unique conception, and be conducive to industrial production Effect

Inactive Publication Date: 2012-09-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laboratory-scale research can use microreactors and control the cracking process by quenching, but this method of operation has no industrial implications

Method used

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  • Method for improving thermal cracking of heavy oil in sub (ultra) critical water
  • Method for improving thermal cracking of heavy oil in sub (ultra) critical water
  • Method for improving thermal cracking of heavy oil in sub (ultra) critical water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Sub (super) critical water intervening free radical initiator triggers residual oil cracking: 20 g vacuum residual oil, 30 g deionized water, 0.1 g azobisisobutylcyanide free radical initiator are added to a volume of 100 ml batch reactor. The reactor was rapidly heated to 380° C. and continued to react for 15 minutes and then cooled to room temperature. Separate the liquid and solid products in the reactor, take the liquid phase product for four-component analysis, collect the solid carbon residue and weigh it.

[0020] According to the above operation process, just do not add 0.1 g azobisisobutyrocyanide free radical initiator, the vacuum residue is thermally cracked under the same operating conditions, and the free radical initiator intervening with sub (super) critical water initiates The data comparison of residue cracking results can be seen in Table 1.

[0021] Table 1 Four-component analysis data of vacuum residue feedstock and cracked products.

[0022]

...

Embodiment 2

[0025] Sub (super) critical water intervening free radical initiator triggers catalytic cracking oil slurry cracking: the catalytic cracking oil slurry and deionized water dissolved in elemental iodine are respectively added to the continuous reactor with a metering pump, and the reactor is immersed in a 390°C Fluidized sand bath. The mass ratio of water and oil is 1:2, and the amount of elemental iodine added is 15×10 -3 . The residence time of materials in the reactor was controlled at 15 min. After the product is separated, the liquid phase is taken for four-component analysis, and the solid carbon residue is collected and weighed.

[0026] According to the above operation process, except that elemental iodine is not added, the catalytic cracking oil slurry is cracked separately under the same operating conditions, and the data comparison with the cracking results of the catalytic cracking oil slurry by the free radical initiator intervened in sub (super) critical water c...

Embodiment 3

[0031] Sub (super) critical water intervened free radical initiators to initiate asphalt cracking: 8 g of asphalt, 32 g of deionized water, and 0.16 g of tertiary dibutyl peroxide were added to a batch reactor with a volume of 100 ml. The reactor was quickly immersed in a fluidized sand bath at 360 °C for 45 min. After the product is separated, the liquid phase is taken for four-component analysis, and the solid carbon residue is collected and weighed.

[0032] According to the above operation process, but without adding tertiary butyl peroxide, the bitumen was subjected to separate thermal cracking under the same operating conditions, and the comparison data with the results of asphalt cracking induced by sub-(super)critical water-mediated free radical initiators can be found in the table 3.

[0033] Table 3 Four-component analysis data of bitumen feedstock and cracked products.

[0034]

[0035] During the free radical-induced bitumen cracking process mediated by sub(su...

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Abstract

The invention relates to a method for improving thermal cracking of heavy oil in sub (ultra) critical water. A radical initiator is introduced to improve the thermal cracking of heavy oil in the sub (ultra) critical water. Preferably, the heavy oil is selected from one or more of vacuum residuum, pitch and catalytic cracking slurry oil. The radical initiator is selected from one or more of elementary iodine, peroxide initiator and azo initiator. The thermal cracking temperature is 360-390 DEG C, the initial mass ratio of the heavy oil to the water is 2:1-1:4, the addition of the radical initiator is 5*10<-3>-20*10<-3> of the mass fraction of the heavy oil, and the thermal cracking is in intermittent or continuous operation mode. An ultrahigh reaction temperature threshold of the thermal cracking of the heavy oil at an induction period can be balanced, so that the thermal cracking of the heavy oil can be carried out under a mild condition, the distribution of cracked liquid phase products is improved, and at the same time coking is effectively suppressed. The operation is simple, the cost is greatly reduced, and the method is conductive to industrial production.

Description

technical field [0001] The invention relates to the technical field of compounds, in particular to the technical field of compound upgrading, and specifically refers to a method for improving thermal cracking of heavy oil in sub-(super)critical water. Background technique [0002] At present, among the approximately 10 trillion barrels of remaining oil resources in the world, more than 70% are heavy oil resources. With the continuous maturity of thermal recovery technology, heavy oil has become an important part of my country's crude oil production. Since the 1990s, environmentally friendly sub (super) critical water (T c =647 K, P c =22.1 MPa) as a thermal cracking upgrading solvent for heavy oil has attracted widespread attention from domestic and foreign academic circles. The technical advantages of this method are: 1) The process is simple and there is no specific requirement on the quality of raw materials; 2) Each component in the heavy oil can form a suitable dispe...

Claims

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Application Information

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IPC IPC(8): C10G9/00
Inventor 袁佩青朱春春谭学才陈功任冲
Owner EAST CHINA UNIV OF SCI & TECH
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