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Catalytic conversion method for increasing propylene yield

A catalytic conversion method and propylene yield technology are applied in the field of catalytic conversion of prolific low-carbon olefins, which can solve the problems of low ethylene yield and low yield of small molecular olefins, and achieve the reduction of sewage discharge, energy consumption, and The effect of hydrothermal inactivation

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of small molecular olefins used in the catalytic cracking reaction of this reactor is relatively low, generally the weight yield of propylene is only 3-5%, and the yield of ethylene is even lower

Method used

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  • Catalytic conversion method for increasing propylene yield
  • Catalytic conversion method for increasing propylene yield
  • Catalytic conversion method for increasing propylene yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 illustrates the implementation effect of adopting the catalytic cracking method for increasing the yield of low-carbon olefins provided by the present invention, using a catalytic cracking catalyst with low activity level and uniform activity distribution, and refining light gasoline fractions.

[0075] A medium-sized variable-diameter riser reactor is adopted. The total height of the pre-lift section, the first reaction zone, the second reaction zone, and the outlet zone of the reactor is 15 meters, the diameter of the pre-lift section is 0.025 meters, and its height is 1.5 meters; the first The diameter of the reaction zone is 0.025 meters, and its height is 4 meters; the diameter of the second reaction zone is 0.1 meters, and its height is 6.5 meters; the diameter of the outlet zone is 0.025 meters, and its height is 3 meters; The apex angle of the isosceles trapezoid in the longitudinal section is 45°; the base angle of the isosceles trapezoid in the longit...

Embodiment 2

[0078] Example 2 illustrates the implementation effect of using different catalysts with low activity and uniform activity distribution in the catalytic cracking method for producing more light olefins provided by the present invention.

[0079] Example 2 uses the same medium-sized variable-diameter riser reactor as in Example 1, catalytic cracking feedstock oil and the same operating steps. The difference from Example 1 is that the catalyst used is CGP-1 catalyst aged at 800° C. with 100% steam for 30 hours, and the activity is 50. The C4 fraction obtained by separating the reaction product was subjected to figure 2 The middle line 6 is injected into the bottom of the second reaction zone of the riser, and the composition of the C4 fraction is shown in Table 3. The reaction conditions, product distribution and gasoline product properties are listed in Table 4.

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Abstract

The invention provides a catalytic conversion method for increasing propylene yield. The method is characterized in that high-quality catalytic cracking raw oil is contacted with a thermal regenerated catalyst having lower mean activity and activities distributed relatively uniformly in a first reaction zone of a reactor to carry out cracking reaction, the generated oil gas and a carbon-containing catalyst carry out selective hydrogen transfer reaction and isomerisation reaction in a certain reaction environment in a second reaction zone, the reaction products and a spent catalyst are separated, the reaction products are further separated into liquefied gas, light gasoline fractions, heavy gasoline fractions, diesel and other products by a fractionating system, the separated spent catalyst is recycled after being stripped and regenerated, and the C4 fraction and / or the light gasoline fractions are injected into the reactor for further reaction. By the method, the propylene yield can be increased and product distribution can be simultaneously improved.

Description

technical field [0001] The present invention relates to a method for catalytic conversion of petroleum hydrocarbons in the absence of hydrogen, and more particularly to a method for catalytic conversion of prolific light olefins. Background technique [0002] Low carbon olefins such as ethylene, propylene and butene are the most basic raw materials for organic synthesis. At present, the production of low-carbon olefins in the world mainly adopts steam cracking method, but the cost of steam cracking equipment is very high, and it is not easy to build; in addition, because the high-temperature cracking furnace is easy to coke, so the steam cracking equipment can only use natural gas, naphtha and light Diesel is used as a raw material, and a certain amount of aromatics is also by-produced. Due to the relatively heavy crude oil in my country and the low yield of naphtha and other light oils, the contradiction between supply and demand of raw materials for steam cracking and cat...

Claims

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Application Information

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IPC IPC(8): C10G55/06
Inventor 刘银亮许友好崔守业张执刚朱根权姜楠
Owner CHINA PETROLEUM & CHEM CORP
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