Method for preparing low carbon number olefin by catalytic pyrolysis

A technology of catalytic cracking and carbon number, applied in the direction of hydrocarbon cracking to produce hydrocarbons, etc., can solve the problems of low conversion rate of raw materials and low propylene yield, and achieve the effects of low reaction temperature, high propylene yield and long service life

Active Publication Date: 2005-10-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, the method for preparing ethylene and propylene by catalytic cracking of C4 or C5 mixed hydro

Method used

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  • Method for preparing low carbon number olefin by catalytic pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 preparation catalyst A

[0041] With 50g ZRP molecular sieve (provided by Beijing Wanshuyuan Economic Technology Trade Center, SiO 2 / Al 2 o 3 >200), 50g silicon oxide (specific surface area >200m 2 / g of high-purity silicon oxide), 2g of scallop powder and mix; add 80ml of 5% nitric acid after mixing, extrude into 2mm cylindrical shape after mixing, and cut into 2-3mm; respectively at 80°C and 120°C Dry for 10 hours, then calcined at 580°C for 6 hours, take it out and cool to room temperature, and put it in a desiccator for later use. The catalyst prepared in this way is designated Catalyst A.

Embodiment 2

[0042] Example 2 Preparation of Catalyst B

[0043] 45g ZRP molecular sieve (SiO 2 / Al 2 o 3 >200), 45g of silicon oxide, 10g of magnesium oxide and 2g of turnip powder were mixed, and after mixing, 80ml of 5% nitric acid was added. Other operating methods are the same as in Example 1. The catalyst prepared in this way is designated Catalyst B.

Embodiment 3

[0044] Example 3 Preparation of Catalyst C

[0045] 45g ZRP molecular sieve (SiO 2 / Al 2 o 3 >200), 45g of silicon oxide, 10g of zirconia and 2g of turnip powder were mixed, and after mixing, 80ml of 5% nitric acid was added. Other operating methods are the same as in Example 1. The catalyst prepared in this way is designated Catalyst C.

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Abstract

This invention discloses a method that makes low-carbon olefin hydrocarbon by catalyzing decomposition. This method uses mixture of C4 or C5 without double olefin hydrocarbon as raw materials, mixes the raw materials and water with their volume ratio 0.3-1.5, in the solid bed reactor to react contacting with the zeolite catalyst with high silicon aluminum ratio, and produces the reacting mixture containing propene and ethane. The zeolite catalyst is composed of high silicon zeolite20-65%, the silicon-aluminum ratio 50-300, monox 20-65%, inorganic oxidant 0-20%. This invention can get high yields of ethane and propene, therefore, this invention explores the important way of compound utilization of C4 and C5 cut fractions in the ethane mills and refineries.

Description

technical field [0001] The invention relates to a method for preparing low-carbon number olefins by catalytic cracking, in particular, the invention relates to a method for preparing propylene and ethylene from C4 and C5 hydrocarbon mixtures without diolefins. Background technique [0002] As we all know, ethylene and propylene are important basic raw materials of petrochemical industry and the basis for the production of various important organic chemical products. With the rapid development of the national economy, the demand for ethylene and propylene continues to increase, and the growth rate of propylene demand is higher than that of ethylene demand. However, the capacity growth of propylene is limited, and the traditional method of increasing propylene production cannot meet the demand of the market. [0003] Hydrocarbon steam cracking and catalytic cracking are the two major sources of propylene. The production of propylene can be increased by reducing the depth of c...

Claims

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Application Information

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IPC IPC(8): C07C4/06
Inventor 王定博李普阳韦以
Owner CHINA PETROLEUM & CHEM CORP
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