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Method for preparing low-carbon olefin by hydrocarbon cracking combined with selective hydrogen burning technology

A combustion technology, low-carbon olefin technology, applied in cracking, catalytic cracking, petroleum industry, etc., can solve the problems of difficult energy supply in the amplification process, reduced external energy supply efficiency, uneven reaction temperature distribution, etc., to solve the problem of amplification , Prevent the local temperature from being too high and reduce the effect of layers

Active Publication Date: 2013-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of external energy supply efficiency caused by the addition of solid catalyst to the reaction tube and the resulting uneven distribution of reaction temperature make it difficult to solve the energy supply of the scale-up process in the industrial application of fixed-bed catalytic cracking, which has become a fixed-bed A Difficult Problem in the Development of Catalytic Cracking Technology
[0004] It can be seen that due to the high temperature and strong endothermic characteristics of the petroleum hydrocarbon cracking process, the steam thermal cracking process used in industry and the catalytic cracking process under research are respectively faced with huge energy demand and high temperature due to external indirect heating. The problem of low heat transfer efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Cracking raw naphtha, water with a weight ratio of 50wt% to naphtha, quantitatively mixed with naphtha with a weight ratio of 4wt% hydrogen, and heat exchange with the reacted stream, the temperature reaches 200 ° C, and then enters the selective The hydrogen combustion heater of hydrogen combustion catalyst (the composition of its selective hydrogen combustion catalyst is: 0.2wt% Pt, 1.0wt% Li, 2wt% Sn, 68wt% 4A molecular sieve, 28.8wt% silicon oxide), will be combined with naphtha The weight ratio is that 12wt% oxygen is uniformly passed into the hydrogen combustion catalyst bed by the oxygen feed port on the hydrogen combustion heater, and the molar ratio of hydrogen and oxygen at the oxygen inlet is controlled to be 2: 1, and the temperature of the stream is raised to 550°C, where the molar content of oxygen at the outlet of the hydrogen combustion heater is 0.5%, and then enters the hydrogen combustion catalytic cracking reactor. The reactor is an adiabatic fixed-be...

Embodiment 2

[0049] Cracking raw naphtha, water with a weight ratio of 50wt% to naphtha, quantitatively mixed with naphtha with a weight ratio of 4wt% hydrogen, and heat exchange with the reacted stream, the temperature reaches 200 ° C, and then enters the selective The hydrogen combustion heater of hydrogen combustion catalyst (the composition of its selective hydrogen combustion catalyst is: 0.2wt% Pt, 1.0wt% Li, 2wt% Sn, 68wt% 4A molecular sieve, 28.8wt% silicon oxide), will be combined with naphtha The weight ratio is that 12wt% oxygen is uniformly passed into the hydrogen combustion catalyst bed by the oxygen feed port on the hydrogen combustion heater, and the molar ratio of hydrogen and oxygen at the oxygen inlet is controlled to be 6: 1, and the temperature of the stream is raised to 550°C, where the molar content of oxygen at the outlet of the hydrogen combustion heater is 0.5%, and then enters the hydrogen combustion catalytic cracking reactor. The reactor is an adiabatic fixed-b...

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Abstract

The invention discloses a method for preparing low-carbon olefin by hydrocarbon catalytic cracking combined with selective hydrogen burning technology, namely the low-carbon olefin is prepared by directly heating a hydrocarbon cracking raw material with heat produced by a hydrogen burning reaction and providing energy required by a cracking reaction. The molar ratio of hydrogen to oxygen at oxygen inlets of a hydrogen burning heater and an adiabatic hydrogen burning catalytic cracking reactor is (2-10):1, preferably (2-6):1. By the method, an oxygen introduction mode is controlled by optimizing technological conditions, so the selectivity of the hydrogen burning reaction can be improved, oxidation losses of petroleum hydrocarbons are reduced, over-high local temperature of a bed layer is prevented, CO content and CO2 content in a product are reduced, and economic value of the process is improved.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins by cracking hydrocarbons, more specifically, the invention relates to a method for producing low-carbon olefins by catalytic cracking of hydrocarbons combined with selective hydrogen combustion technology. Background technique [0002] As we all know, the production of light olefins from petroleum hydrocarbon cracking is a high temperature and strong endothermic process. At present, the most common method of producing light olefins such as ethylene, propylene and butadiene from petroleum saturated hydrocarbons is steam cracking. About 99% of the world's ethylene and more than 50% of the propylene are produced by this method. Since the production of steam cracking method is currently operated under very harsh conditions, for example, the final temperature of the furnace tube in the radiant section of the cracking furnace reaches or exceeds 1125°C, and the residence time of materials in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/20
Inventor 张勇杨沙沙白杰陈硕王国清张利军郝雪松
Owner CHINA PETROLEUM & CHEM CORP