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A kind of catalytic cracking method combined with hydrotreating to produce propylene

A catalytic cracking and hydrotreating technology, applied in hydrotreating process, hydrocarbon oil treatment, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problems that do not involve control or inhibition, achieve low dry gas and coke yield, improve The conversion capacity of heavy oil and the effect of improving the yield of propylene

Active Publication Date: 2015-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the patent does not involve how to control or suppress the production of dry gas and coke during the conversion process

Method used

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  • A kind of catalytic cracking method combined with hydrotreating to produce propylene
  • A kind of catalytic cracking method combined with hydrotreating to produce propylene
  • A kind of catalytic cracking method combined with hydrotreating to produce propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The experiment was carried out in a medium-sized riser catalytic cracking unit. The internal diameter of the first riser reactor of this medium-sized device is 16 mm, and the height is 3800 mm. The internal diameter of the second riser reactor is 16 mm, and the height is 3200 mm. The outlet of the second riser reactor is connected to the fluidized bed reactor. The inner diameter of the fluidized bed reactor is 64 mm and the height is 600 mm, and its configuration is as follows figure 1 As shown, the test was operated in the way of back refining. A stream of high-temperature regenerated catalyst is introduced into the first riser tube reactor through the regenerated inclined pipe 9, and flows upward under the action of the pre-lift medium (steam); the raw material B is preheated and mixed with atomized water vapor, and then passed through the The material nozzle enters the riser reactor 1 and contacts with the hot regenerant to carry out the catalytic conversion reactio...

Embodiment 2~3

[0057] According to the method of embodiment 1, reaction condition and reaction result are shown in Table 4.

Embodiment 4

[0059] According to the method of Example 1, the difference is that the aromatics content of the cracked heavy oil introduced into the riser reactor 2 after hydrotreating is 24.5% by weight (the weight hourly space velocity of the hydrotreating operation unit is 1.0h -1 The product starting material A-1 was obtained under the conditions. ).

[0060] It can be seen from Table 3 and Table 4 that the method provided by the present invention has enhanced heavy oil conversion capability and more reasonable product distribution. Lower dry gas and coke yields, high propylene, butene and total liquid yields can be obtained.

[0061] Table 1

[0062]

[0063] In Table 1, w means quality

[0064] Table 2

[0065]

[0066] table 3

[0067]

[0068] Table 4

[0069]

[0070] The fresh feed described in Tables 3 and 4 refers to heavy raw material, namely raw material B. w% is mass percentage, w means mass, and a means absolute pressure.

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Abstract

A hydrotreatment combined catalytic cracking method for producing propylene comprises the following steps: carrying out a cracking reaction by allowing heavy raw materials to contact with a catalyst containing shape selective zeolite having an average aperture of below 0.7nm in first riser reactor, carrying out hydrotreatment of recycle cracked heavy oil in a fluidized bed reactor, carrying out a contact cracking reaction of the obtained hydrogenated recycle cracked heavy oil and the catalyst containing shape selective zeolite having an average aperture of below 0.7nm in a second riser reactor, and carrying out a contact reaction of the above obtained material and lightweight hydrocarbon oil. The method is used for the catalytic cracking of heavy oil, and realizes a high heavy oil conversion rate, a high propylene yield, a low dry gas yield and a low coke yield.

Description

technical field [0001] The invention relates to a catalytic cracking method combined with a hydrotreating process. Background technique [0002] Catalytic cracking of heavy oil is an important method for preparing small molecular olefins such as ethylene, propylene and butene. Industrially used heavy oil catalytic cracking methods to produce light olefins include catalytic cracking technology for maximum production of propylene (DCC, USP4980053 and USP5670037) and catalytic thermal cracking technology for maximum production of ethylene (CPP, USP6210562). The reactor structure of single riser reactor or single riser reactor combined with fluidized bed cooperates with special catalyst to react at higher temperature. Although the above two existing patented technologies can produce low-carbon olefins such as propylene and ethylene, their dry gas and coke yields are relatively high, and it is difficult to further increase the propylene yield, and it is difficult to maintain a h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00C07C11/06C07C4/06
CPCY02P20/52Y02P20/584
Inventor 高永灿谢朝钢朱金泉崔琰牛传峰杨轶男沙有鑫马建国
Owner CHINA PETROLEUM & CHEM CORP
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