Method for reducing content of olefin in gasoline in catalytic cracking process

A catalytic cracking and catalytic cracking device technology, applied in the field of catalytic cracking, can solve problems such as adjustments that have not been mentioned, and achieve the effects of simple and easy technical solutions, improved product distribution, and extended induction period

Inactive Publication Date: 2005-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] To sum up, the purpose of adopting quenching or termination method in the catalytic cracking process disclosed in the prior art is to suppress the impact of secondary cracking and improve product distribution. It has not been mentioned that the use of quenching or termination has a significant effect on the olefin content and isocyanurate in gasoline. Technical solution for adjusting the ratio of normal hydrocarbons

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] This embodiment illustrates: the actual application effect of the method provided by the present invention.

[0021] The test is in a set of 80 x 10 4 It was carried out on the t / a heavy oil catalytic cracking (RFCC) unit, using the crude gasoline of this unit as the termination medium, and using the commercially produced DOCP catalyst produced by Sinopec Changling Catalyst Factory. The main physical and chemical properties are shown in Table 1. In the case of the same catalyst replenishment rate, the effect of different terminator dosage on product distribution was investigated. The unit has two terminator injection points in the middle and upper part of the riser. Table 2 lists the application results when the terminator is injected from the middle of the riser when the dosage of the terminator is 1% by weight, 10% by weight and 16% by weight of the treatment amount. The oil contact time before the terminator injection point was about 1.4 seconds, and the reaction t...

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PUM

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Abstract

This invention provides a method for lowering the content of gasoline olefines in catalystic cracking process. The inert termination medium, not taking part in the reaction, is fed into life-pipe, mixed with reactant-flow already in the life-pipe, then up-flowing along said pipe. The produced products stream is proceeded with oil-separation and products-recovery. Wherein, the volume of the termination medium fed-in is of 2-8 wt.% of the capacity of the catalystic cracking installation, and the feeding-point is at 1.0-2.0 seconds point of oil-contacting in lift-pipe. In this invention, light wt. petro-hydrocarbon can be used as termination agent, with its feeding valume being 5-15 wt%, and feeding-point being at 1.0-2.0 seconds point of oil-contacting time point. This invention is easy to operate, with lower olefines content in gasoline, and increases iso-hydrocarbons normal hydrocarbons ratio.

Description

technical field [0001] The invention belongs to the catalytic cracking method of petroleum hydrocarbons in the absence of hydrogen, more specifically, a method for reducing the olefin content of gasoline in the catalytic cracking process. Background technique [0002] In recent years, a lot of research work has been carried out to improve the distribution of catalytic cracking products by controlling the reaction process in the riser reactor by means of quenching and termination. For example, USP5954942 uses a terminator medium, including water and vaporizable liquid hydrocarbons, which is injected at the rear of the riser to enhance heavy oil conversion and improve product distribution. After injecting 15-30% water, the yield of liquefied gas increases by 0.2-1.1 percentage points; gasoline increases by 1-2.1 percentage points; dry gas increases by 0.4-1.3 percentage points. With 15% heavy naphtha as the terminator medium, the gasoline yield increases gradually by 1.4 perc...

Claims

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Application Information

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IPC IPC(8): C10G11/00
Inventor 毛安国常学良顾洁
Owner CHINA PETROLEUM & CHEM CORP
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