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Catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons

A technology for catalytic cracking and low-carbon olefins, applied in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, petroleum industry, etc., can solve the problems of limited and increased light aromatic yield, etc., and achieve high BTX yield, reduced selectivity, high efficiency The effect of conversion

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing technologies all take low-carbon olefins as the main target yield and co-produce light aromatics, so the increase in the yield of light aromatics is limited. It is necessary to develop a catalytic cracking method with higher yields of low-carbon olefins and light aromatics on the basis of current technology and catalytic materials

Method used

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  • Catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons

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preparation example Construction

[0072] The present invention also provides a method for preparing the catalytic cracking catalyst, comprising preparing the phosphorus-containing and metal-loaded IMF structure molecular sieve, and combining the obtained phosphorus-containing and metal-loaded IMF structure molecular sieve with Y-type molecular sieve, natural minerals , the precursor sol of oxide is mixed and beaten, and spray-dried; wherein the preparation method of phosphorus-containing and metal-loaded IMF structure molecular sieves comprises:

[0073] a. Desiliconizing the sodium-type IMF structure molecular sieve in an alkaline solution to obtain a desiliconization molecular sieve; b. performing an ammonium exchange treatment on the desilication molecular sieve obtained in step a to obtain an ammonium exchange molecular sieve; The total dry basis weight of the ammonium-exchanged molecular sieve is a benchmark, and the sodium content of the ammonium-exchanged molecular sieve is less than 0.2 weight %; dealu...

Embodiment

[0122] according to figure 1 The process is tested, the feed oil is vacuum distillate oil, MMC-2 catalyst is used, and the test is carried out on a medium-sized device. The three reactors are all operated under normal pressure. The hydrocracking tail oil enters the riser 1, and the reaction temperature is 580 ℃, reaction time 2.0 seconds, the weight ratio of regenerated catalyst and raw catalyst mixture (wherein the raw catalyst accounts for 20% by weight of the catalyst mixture) to raw oil is 10, and the weight ratio of water vapor to raw oil is 0.25 to carry out the cracking reaction , the reaction oil gas and water vapor and the unborn catalyst enter the cyclone separator from the reactor outlet.

[0123] Aromatic raffinate oil (saturated hydrocarbon content is 87% by weight) enters the bottom of the riser 2, and at a reaction temperature of 625°C and a reaction time of 1.8 seconds, the weight ratio of the regenerated catalyst to the feedstock oil is 15, and the weight rati...

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Abstract

The invention relates to a catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons. According to the catalytic cracking method, a heavy raw material and a first catalytic cracking catalyst are subjected to a contact reaction in a first reactor; a lightweight raw material rich in saturated hydrocarbons, a lightweight raw material rich in olefins and a second catalytic cracking catalyst are subjected to a contact reaction in a second reactor and a third reactor; all the reaction oil-gas and the spent catalysts are subjected to gas-solid separation; the reactionoil-gas is further separated to obtain a product containing light-carbon olefins and light aromatic hydrocarbons; and the spent catalysts are subjected to steam stripping, the steam stripped catalysts enter a catalyst regenerator, charring regeneration is performed, and the regenerated catalyst returns to the reactor so as to be recycled, wherein the catalytic cracking catalyst comprises, by weight, 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y-type molecular sieve and a loaded metal-containing IMF structure molecular sieve. With the method of the present invention, the yield of low-carbon olefins is high, and the yield of light aromatic hydrocarbons is high.

Description

technical field [0001] The present invention relates to a method for catalytic conversion of hydrocarbon oil in the absence of hydrogen, and more particularly to a catalytic cracking method for producing light olefins and light aromatics. Background technique [0002] Low-carbon olefins represented by ethylene and propylene are the most basic raw materials in the chemical industry. Natural gas or light petroleum fractions are mostly used as raw materials at home and abroad, and low-carbon olefins are produced by steam cracking technology in ethylene complexes. In addition to the production of ethylene, about 70% of propylene, 90% of butadiene, and 30% of aromatics come from steam cracking by-products. Although the steam cracking technology has been developed for decades and the technology has been continuously improved, it still has high energy consumption, high production cost, and CO 2 Due to technical limitations such as large emissions and difficult adjustment of produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/02
CPCC10G65/02C10G2300/70C10G2300/703C10G2400/20C10G2400/24
Inventor 谢朝钢魏晓丽陈学峰张久顺罗一斌田辉平张执刚刘银亮李福超
Owner CHINA PETROLEUM & CHEM CORP
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