Process for preparing propylene and ethylene by catalytic cracking of olefin

A catalytic cracking and olefin technology, applied in hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., can solve the problems of poor high-temperature hydrothermal stability of catalysts, easy coking and deactivation of catalysts, etc.

Active Publication Date: 2005-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there are problems in the prior art that the catalyst has poor high-temperature hydro...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 100g SiAl Molar Ratio SiO 2 / Al 2 o 3 For 200 NaZSM-5 molecular sieves, first roast the release agent at 600°C for 4 hours under nitrogen flow, then exchange with 0.1 mol / liter hydrochloric acid 1 liter at 80°C for three to four times, wash with deionized water until there is no chlorine radical, 120 °C for drying.

[0035] 30 grams of the above molecular sieve and Ce 2 o 3 50 ml of 2.0 g of cerium nitrate solution was heated to dryness under stirring, then dried at 120° C. for 10 hours, calcined at 550° C. for 2 hours, and pulverized. Add 3 grams of celadon powder and mix evenly, then add 50 grams of 40% by weight silica sol to adjust to a dry paste, and after proper dehydration, extrude into a shape of Φ1.6 mm. After baking at 120°C for 10 hours, bake at 550°C for 4 hours. Catalyst containing Ce 2 o 3 4% by weight, a catalyst with a molecular sieve content of 60% by weight.

[0036] When the water / olefin weight ratio is 1, the carbon four liquid phase space ...

Embodiment 2～14

[0038] Same preparation process as embodiment 1, change the SiO of molecular sieve 2 / Al 2 o 3 Molar ratio and rare earth content, get catalyst and evaluation list 1.

[0039]

[0040] Note: the rare earth content of the above-mentioned examples is calculated based on its oxide.

Embodiment 15

[0042] time (hours)

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Abstract

The invention relates to a process for preparing propylene and ethylene by catalytic cracking of olefin through using C4-C8 olefin as raw material, using M-ZSM-5 molecular sieve containing rare earth metals or their oxides as the catalyst for the reactive main body, and employing a reaction temperature of 450-650 deg. C, reaction pressure 0-0.2 MPa, liquid hourly space velocity of 0.5-150h-1, the invention can be applied into the industrial production of propylene through olefin pyrolysis.

Description

technical field [0001] The invention relates to a method for producing propylene and ethylene by catalytic cracking of olefins, in particular to a method for producing propylene and ethylene by catalytic cracking of C4-C8 olefins. Background technique [0002] Mixed C4 olefins are by-products of FCC units in ethylene plants and refineries, and can only be used as low value-added products such as liquefied gas fuels. It is economically and technically feasible to further process it into propylene and ethylene and make full use of this considerable amount of precious olefin resources. [0003] The active components of catalysts usually used for olefin cracking are molecular sieves such as hydrogen ZSM-5, ZSM-11 or SAPO-34. A large amount of inert gas as a heat carrier and diluent is extremely beneficial to the performance of this reaction, and the most ideal dilution The agent is water. However, the presence of water in the reaction process is e...

Claims

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Application Information

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IPC IPC(8): C07C11/04
Inventor 金文清滕加伟李斌谢在库
Owner CHINA PETROLEUM & CHEM CORP
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