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Catalyst for using C4 olefin to prepare ethylene and propylene by catalytic pyrolysis and application method thereof

A catalytic cracking and ethylene propylene technology, which is applied in the direction of carbon compound catalysts, physical/chemical process catalysts, catalysts, etc., can solve the problems of low ethylene propylene yield and poor thermal stability of catalysts, and achieve high hydrothermal stability and high temperature water Thermal stability, high yield effect

Inactive Publication Date: 2011-08-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The purpose of the present invention is to provide a catalyst for producing ethylene propylene by catalytic cracking of C4-olefins and its application method, which mainly solves the problems of poor high-temperature hydrothermal stability of the catalyst and low yield of the target product ethylene propylene in the prior art

Method used

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  • Catalyst for using C4 olefin to prepare ethylene and propylene by catalytic pyrolysis and application method thereof
  • Catalyst for using C4 olefin to prepare ethylene and propylene by catalytic pyrolysis and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 23.3 grams (NH 4 ) 2 HPO 4 Dissolve in 1000 grams of distilled water, add 270 grams of ZSM-5 molecular sieve sample to the solution with stirring, and adjust the pH to 4. At a reaction temperature of 100°C and a reaction pressure of 0.2MPa, the reaction was stirred for 60 minutes, filtered, dried, and then calcined at 500°C for 4 hours. The resulting molecular sieve sample was designated as PZ-1. The composition of the sample and the crystallinity before and after aging are shown in Table 1.

[0037] The catalyst is prepared by the tablet method, and the PZ-1 and α-Al 2 O 3 After the carrier is evenly mixed, use a tablet press to press tablets at 20MPa, PZ-1 and Al 2 O 3 The carrier weight ratio is 90:10, and 20-40 mesh particles are taken. The catalyst is designated as C-1.

[0038] Reaction conditions: take heavy carbon four in the east zone of Lanzhou Petrochemical Company as raw material, water / carbon four olefin volume ratio is 0.01, weight hourly space velocity i...

Embodiment 2

[0040] Take 69.7 grams (NH 4 )H 2 PO 4 Dissolve in 1000 grams of distilled water, add 270 grams of ZSM-11 molecular sieve sample to the solution with stirring, and adjust the pH to 2. At a reaction temperature of 140°C and a reaction pressure of 0.6 MPa, the reaction was stirred for 200 minutes, filtered, dried, and then calcined at 450°C for 6 hours. The resulting molecular sieve sample was designated as PZ-2. The composition of the sample and the crystallinity before and after aging are shown in Table 1.

[0041] The catalyst is prepared by extrusion method, PZ-2 and β-Al 2 O 3 The carrier weight ratio is 90:10, and the catalyst is extruded into a strip shape. The catalyst is designated as C-2.

[0042] Reaction conditions: Taking heavy carbon four in the east zone of Lanzhou Petrochemical Company as raw material, water / carbon four olefin volume ratio of 0.1, weight hourly space velocity of 3h -1 , The reaction temperature is 450°C, and the reaction pressure is 0.1 MPa. The cat...

Embodiment 3

[0044] Take 70 grams (NH 4 ) 2 HPO 4 And 69.4 grams (NH 4 )H 2 PO 4 The mixture was dissolved in 1000 grams of distilled water, 270 grams of ZSM-18 molecular sieve sample was added to the solution under stirring, and the pH value was adjusted to 3. At a reaction temperature of 160°C and a reaction pressure of 0.8MPa, the reaction was stirred for 200 minutes, filtered, dried, and then calcined at 550°C for 4 hours. The resulting molecular sieve sample was designated as PZ-3. The composition of the sample and the crystallinity before and after aging are shown in Table 1.

[0045] The catalyst is prepared by extrusion method, PZ-3 and γ-Al 2 O 3 The carrier weight ratio is 70:30, and the catalyst is extruded into a strip shape. The catalyst is designated as C-3.

[0046] Reaction conditions: take the mixed carbon four in the east zone of Lanzhou Petrochemical Company as raw material, the volume ratio of water / carbon four olefin is 0.6, and the weight hourly space velocity is 6h -1 , ...

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Abstract

The invention relates to a catalyst for using C4 olefin to prepare ethylene and propylene by catalytic pyrolysis and an application method thereof, and mainly solves problems of bad hydrothermal stability of the catalyst at high temperature and low yield percentage of target products- the ethylene and the propylene in the prior art. The catalyst of the invention contains 50-90 weight percent of molecular sieve of ZSM type of phosphorus modification, 10-50 weight percent of Al2O3 carrier, and 0.01-5 weight percent of phosphorus. The catalytic pyrolysis reaction is carried out with the following materials and under the conditions: the C4 olefin as raw material, nitrogen as carrier gas, water vapour as dilution gas, ratio of water to oil 0.01-1.0, reaction temperature 400-650 DEG C, weight hourly space velocity 1-10 h-1, and pressure 0.01-1.0 MPa. The technical scheme better solves the above problems, thereby realizing the characteristics of high hydrothermal stability of the catalyst, high yield percentage of the products of the ethylene and propylene, etc and being able to be used in industrial production of the ethylene and the propylene using the C4 olefin by the catalytic pyrolysis.

Description

Technical field [0001] The invention relates to a catalyst and an application method for preparing ethylene and propylene by catalytic cracking of carbon four olefins as raw materials. Background technique [0002] C4 hydrocarbons are important chemical raw materials, mainly derived from catalytic cracking and steam cracking (by-products of ethylene cracking), in addition to by-products such as oilfield gas recovery, ethylene oligomerization, isobutane and propylene co-oxidation to propylene oxide. At present, the utilization of C4 hydrocarbons includes fuel utilization and chemical utilization. After years of hard work, my country has made considerable progress in the use of C4 hydrocarbons, but the actual utilization rate is still not high. 60% to 70% is used as fuel , The butene utilization rate of C4 hydrocarbons is only 16%. [0003] Low-carbon olefins such as ethylene and propylene are important chemical raw materials with a wide range of uses and play an important role in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/70C07C4/06C07C11/06C07C11/04
CPCC07C2529/40C07C2521/04C07C2529/70C07C4/06Y02P20/52
Inventor 高雄厚唐志诚季东张海涛王智峰吕功煊张晨曦李荻马燕青谭争国
Owner PETROCHINA CO LTD
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