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Method for preparing olefins by catalytic pyrolysis

A technology for catalytic cracking and olefin production, which is used in catalytic cracking, hydrocarbon cracking to produce hydrocarbons, chemical instruments and methods, etc. It can solve the problem of low catalyst activity, and achieve the effect of high activity, uniform slurry and tight bonding.

Active Publication Date: 2014-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the low activity of the molecular sieve fluidized bed catalyst used in the existing catalytic cracking technology to produce olefins. A new method for catalytic cracking to produce olefins is provided. The catalyst used in the method has catalytic Advantages of high performance

Method used

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  • Method for preparing olefins by catalytic pyrolysis
  • Method for preparing olefins by catalytic pyrolysis
  • Method for preparing olefins by catalytic pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Take by weighing 500 grams of kaolin and 2 grams of fennel powder, after mixing evenly, add 2000 grams of distilled water, shear at a high speed for 30 minutes with a high-speed shearing machine, then add 500 grams of silica sol containing 40% by weight of silicon oxide, and continue high-speed shearing for 30 minutes Minutes, then add 1 gram of triammonium citrate, 2 grams of sodium carbonate, after continuing high-speed shearing for 30 minutes, measure the particle size of this suspension with a laser particle size analyzer, and its average particle diameter is 2 microns. Spray molding with a spray dryer, the spray molding conditions are: inlet temperature 240°C, outlet temperature 120°C, centrifugal speed 10000 rpm, cyclone pressure difference at the outlet is 0.7KPa, feed rate is 1 kg / hour, and the formed micro Ball Catalyst Precursor I. The catalyst precursor I was calcined by temperature programming at 400° C. for 3 hours, and then at 650° C. for 3 hours to obtain ...

Embodiment 2～10

[0030] According to the method of Example 1, using the ingredients and preparation conditions in Table 1 and Table 3, wherein the silica sol contains 40% by weight of silicon dioxide, the performance of the prepared fluidized bed catalyst is shown in Table 2.

[0031]

[0032]

[0033] table 3

[0034]

Embodiment 11

[0036] Get the method for 200 grams of embodiment 1 to make fluidized bed ZSM-5 catalyst, put into inner diameter and be the fluidized bed reactor of 50 millimeters, adopt the component that Shanghai Gaoqiao petrochemical company produces is C 4 ~C 10 The light oil is used as the raw material (see Table 4 for the physical properties of the raw material), and the activity of the catalyst is evaluated. The reaction temperature range is 680 ° C, the reaction pressure is 0.02 MPa, and the weight space velocity is 1 hour -1 , water / feedstock oil weight ratio is 1: 1 under evaluation, product distribution is shown in Table 5, obtains ethylene weight yield and is 27%, and propylene weight yield is 23%, and diene weight total yield is 50%.

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Abstract

The invention relates to a method for preparing olefins by catalytic pyrolysis. By the method, the problem of low activity of a fluidized bed catalyst in the conventional technology for preparing the olefins by the catalytic pyrolysis is mainly solved. In the method for preparing the olefins by the catalytic pyrolysis, hydrocarbons which have 4 to 12 carbon atoms and serve as raw materials contact a catalyst on a catalyst bed to perform reaction at the temperature of between 550 and 750 DEG C, under the reaction gauge pressure of between 0.001 to 0.5 MPa and under the conditions that the reaction weight space velocity is between 0.05 and 4 hour<-1>, and a weight ratio of water to light oil is (0-4):1 to generate low-carbon olefins, wherein the catalyst is a zeolite socony mobil-5 (ZSM-5) fluidized bed catalyst without a bonding agent. Through the technical scheme, the problem is better solved. The method can be used for the industrial production of the olefins by the catalytic pyrolysis.

Description

technical field [0001] The invention relates to a method for producing olefins by catalytic cracking. Background technique [0002] As the leader of the petrochemical industry, the ethylene propylene industry plays a pivotal role in the development of the national economy. With the development of society, the market demand for ethylene propylene in my country has increased sharply, the import volume of ethylene propylene and its downstream products has increased year by year, and the market share of domestic products is less than half. Ethylene and propylene can be used to produce plastics and other chemical products, and are important organic chemical raw materials. With the progress and development of modern society, their demand is increasing. At present, more than 98% of the world's ethylene production comes from steam cracking technology, and propylene production is mainly obtained in two forms: the co-product of steam cracking to produce ethylene and the by-product of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/05C10G11/18C07C4/06C07C11/04C07C11/06B01J29/40
CPCY02P20/52
Inventor 马广伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP