Preparation method of rare earth modified hierarchical porous ZSM-5 molecular sieve for yield increase of propylene

A technology of ZSM-5 and rare earth modification, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems affecting the catalytic cracking efficiency of catalytic cracking main catalysts, the quality of propylene products, and poor propylene selectivity, etc. problem, to achieve the effect of improving the conversion efficiency of raw material catalytic cracking, low production cost and good propylene selectivity

Inactive Publication Date: 2020-05-05
YANAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the production of propylene, ZSM-5 molecular sieve is one of the important catalysts to improve the production efficiency and quality of propylene, whether it is directly using raw material hydrocarbon oil or based on raw materials such as methanol for cracking, decomposition and conversion to produce propylene. In actual use, it is found that the currently used ZSM-5 molecular sieve is often in the traditional ZSM-5 molecular sieve structure, although it can meet the needs of use to a certain extent, but on the one hand, there is poor activity of ZSM-5 molecular sieve, short service life, and ZSM-5 molecular sieve has less surface voids and poor selectivity to propylene. On the other hand, the currently used ZSM-5 molecular sieve also has poor recombination with the catalytic cracking main catalyst produced by propylene, which seriously affects the catalytic cracking main catalyst. Catalytic Cracking Efficiency
[0003] In response to this problem, a large number of ZSM-5 molecular sieves based on phosphorus modification and rare earth modification have been developed. Although the production efficiency of propylene has been improved to a certain extent, the modified ZSM-5 molecular sieves are used to varying degrees. There are disadvantages of short life and poor hydrothermal stability, which lead to high cost of use of ZSM-5 molecular sieve, and easily affect the quality of propylene products

Method used

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  • Preparation method of rare earth modified hierarchical porous ZSM-5 molecular sieve for yield increase of propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 Shown, a kind of preparation method of the rare-earth modified multi-stage channel ZSM-5 molecular sieve that is used for propylene increasing production comprises the following steps:

[0024] The first step is to mix the materials. First, aluminum ash, quartz sand, sodium carbonate, borax, and non-ionic polyacrylamide are added to deionized water at a temperature of 20°C to mix and stir evenly to obtain a liquid base material. The base material is kept in a stirring state and stored for later use;

[0025] The second step is material preparation. Firstly, under the same condition of stirring the liquid base material, within 10 minutes, add calcium hydroxide, zeolite powder, silica sol and sodium methyl silicate to the liquid base material at a uniform speed. , and then under the condition of keeping the stirring state unchanged, the temperature of the mixture was raised to 50°C at a constant speed of 5°C / min, and the mixture was continuously heated a...

Embodiment 2

[0035] Such as figure 1 Shown, a kind of preparation method of the rare-earth modified multi-stage channel ZSM-5 molecular sieve that is used for propylene increasing production comprises the following steps:

[0036] The first step is to mix the materials. First, aluminum ash, quartz sand, sodium carbonate, borax, and non-ionic polyacrylamide are added to deionized water at a temperature of 30°C to mix and stir evenly to obtain a liquid base material. The base material is kept in a stirring state and stored for later use;

[0037] The second step is material preparation. Firstly, under the condition that the stirring state of the liquid base material remains unchanged, within 15 minutes, calcium hydroxide, zeolite powder, silica sol and sodium methyl silicate are added to the liquid base material at a uniform speed. , and then under the condition of keeping the stirring state unchanged, the temperature of the mixture was raised to 80°C at a constant speed of 10°C / min, and th...

Embodiment 3

[0048] like figure 1 Shown, a kind of preparation method of the rare-earth modified multi-stage channel ZSM-5 molecular sieve that is used for propylene increasing production comprises the following steps:

[0049] The first step is to mix the materials. First, aluminum ash, quartz sand, sodium carbonate, borax, and non-ionic polyacrylamide are added to deionized water at a temperature of 25°C to mix and stir evenly to obtain a liquid base material. The base material is kept in a stirring state and stored for later use;

[0050] The second step is material preparation. Firstly, under the condition that the stirring state of the liquid base material remains unchanged, within 12 minutes, calcium hydroxide, zeolite powder, silica sol and sodium methyl silicate are added to the liquid base material at a uniform speed. , and then under the condition of keeping the stirring state unchanged, the temperature of the mixture was raised to 60°C at a constant speed of 8°C / min, and the mi...

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Abstract

The invention relates to a preparation method of a rare earth modified hierarchical porous ZSM-5 molecular sieve for yield increase of propylene. The preparation method comprises four steps of material mixing, material modulation, molding processing and modification molding. The preparation method is low in raw material cost, small in toxic and side effects, simple in processing and production process, low in production cost and small in environmental pollution. On one hand, the hydrothermal stability of the ZSM-5 molecular sieve is effectively improved, the activity is high, the service lifeis long, and the propylene selectivity is good; on the other hand, the compounding effect between the ZSM-5 molecular sieve and a catalytic cracking main catalyst in propylene production is good, so that the catalytic cracking conversion efficiency of the raw material can be greatly improved, and the liquefied gas production efficiency and the propylene content in liquefied gas are greatly improved.

Description

technical field [0001] The invention relates to a catalyst production technology, in particular to a preparation method of a rare earth modified multi-stage pore ZSM-5 molecular sieve for increasing the production of propylene. Background technique [0002] At present, in the production of propylene, ZSM-5 molecular sieve is one of the important catalysts to improve the production efficiency and quality of propylene, whether it is directly using raw material hydrocarbon oil or based on raw materials such as methanol for cracking, decomposition and conversion to produce propylene. In actual use, it is found that the currently used ZSM-5 molecular sieve is often in the traditional ZSM-5 molecular sieve structure, although it can meet the needs of use to a certain extent, but on the one hand, there is poor activity of ZSM-5 molecular sieve, short service life, and ZSM-5 molecular sieve has less surface voids and poor selectivity to propylene. On the other hand, the currently us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38B01J29/40
CPCC01B39/38B01J29/40
Inventor 李雪礼侯硕旻张琰图牛保明路瑞玲王亚斌张哲豪金君蔺军兵
Owner YANAN UNIV
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