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A kind of in-situ preparation method of catalyst for producing low-carbon olefins and co-producing p-xylene

A technology of p-xylene and low-carbon olefins, which is applied in the field of chemical engineering, can solve the problems that the conversion rate of toluene is only ~20%, the catalyst preparation process is complicated, and the conversion rate of methanol is not mentioned, so as to save preparation and transfer steps and facilitate The effect of simple operation and process

Active Publication Date: 2020-08-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101417236A discloses a fluidized bed catalyst for the alkylation of toluene and methanol to produce p-xylene and light olefins, using HZSM-5 molecular sieve catalysts modified with alkaline earth metals, nonmetals, rare earth metals and siloxane compounds. The selectivity of PX in the xylene product reaches 99%, and ethylene and propylene are in C 1 -C 5 The selectivity in non-condensable gas is greater than 90%, but the conversion rate of toluene is only ~20%, and the conversion rate of methanol is not mentioned; in addition, the catalyst preparation process is complicated, requiring multiple modification and roasting processes

Method used

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  • A kind of in-situ preparation method of catalyst for producing low-carbon olefins and co-producing p-xylene
  • A kind of in-situ preparation method of catalyst for producing low-carbon olefins and co-producing p-xylene
  • A kind of in-situ preparation method of catalyst for producing low-carbon olefins and co-producing p-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1 Preparation of HZSM-5 molded molecular sieve sample for fixed bed

[0074] 100g of HZSM-5 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=30) is calcined at 550℃ for 4 hours in an air atmosphere, then compressed into tablets, crushed and sieved to obtain a shape with a particle size of 40-60 mesh Molecular sieve particles, denoted as FXHZSM-5-A.

[0075] After calcining 100g HZSM-5 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=5) for 4 hours at 550°C in air, the pellets are formed, crushed, and sieved to obtain a shape with a particle size of 40-60 mesh. Molecular sieve particles, denoted as FXHZSM-5-B.

[0076] After calcining 100g HZSM-5 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=10) for 4 hours at 550°C in air, the pellets are formed, crushed, and sieved to obtain a shape with a particle size of 40-60 mesh. Molecular sieve particles, denoted as FXHZSM-5-C.

Embodiment 2

[0077] Example 2 Preparation of HZSM-11 molded molecular sieve sample for fixed bed

[0078] After calcining 100g HZSM-11 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=35) at 550℃ for 4 hours in an air atmosphere, the pellets are formed, crushed, and sieved to obtain a shape with a particle size of 40-60 mesh. Molecular sieve particles, denoted as FXHZSM-11-A.

[0079] After calcining 100g HZSM-11 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=12) at 550℃ for 4 hours in air atmosphere, the pellets are formed, crushed, and sieved to obtain a particle size of 40-60 mesh. Molecular sieve particles, denoted as FXHZSM-11-B.

[0080] Example 3 Preparation of HZSM-5 molded molecular sieve sample for fluidized bed

[0081] Mix 100g of HZSM-5 zeolite molecular sieve powder (Nankai University Catalyst Factory, Si / Al=30) with an amorphous binder containing aluminum or silicon, spray-dried to form, the specific steps are:

[0082] Mix HZSM-5 ...

Embodiment 4

[0085] Example 4 Preparation of HZSM-5 molded molecular sieve sample for fluidized bed

[0086] The specific preparation conditions and steps are the same as in Example 3. The difference is that the amount of raw HZSM-5 zeolite molecular sieve powder is 10kg, and the particle size distribution of the obtained microsphere particle sample is 20-120μm, and the wear index is 1.2, which is recorded as FLHZSM -5-B.

[0087] The specific preparation conditions and steps are the same as those in Example 3. The difference is that the raw material HZSM-5 zeolite molecular sieve powder has a silicon-to-aluminum ratio Si / Al=10, and the obtained microsphere particle size distribution is 20-100 μm, and the wear index is 1.2, marked as FLHZSM-5-C.

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Abstract

The present application discloses an in-situ preparation method of a catalyst for producing low-carbon olefins for co-production of p-xylene. A catalyst for co-producing p-xylene from olefins; the reactor is a reactor for producing low-carbon olefins and co-producing p-xylene. The method simplifies the entire chemical production process by directly preparing the catalyst in the reaction system, saves catalyst preparation and transfer steps, and is easy to operate.

Description

Technical field [0001] The application relates to an in-situ preparation method of a catalyst for preparing low-carbon olefins and co-producing p-xylene, which belongs to the field of chemical engineering. Background technique [0002] Ethylene and propylene are the cornerstones of the huge petrochemical industry, and most organic chemical products are derived from ethylene and propylene. Paraxylene (PX) is the raw material for the production of polyesters such as PET (polyethylene terephthalate), PBT (polybutylene terephthalate) and PTT (polytrimethylene terephthalate). In recent years, a large number of applications of polyester in textiles, clothing, beverage packaging and other fields have driven the rapid growth of PTA (purified terephthalic acid) and the production and consumption of upstream products PX. At present, the source of PX is mainly toluene and C which are obtained by reforming naphtha. 9 Aromatics and mixed xylenes are prepared as raw materials through dispropo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C1/20C07C2/86C07C2/76C07C4/06C07C11/04C07C11/06C07C15/08
CPCB01J2229/32B01J2229/34C07C1/20C07C2/76C07C2/864C07C2/865C07C4/06C07C11/04C07C11/06C07C15/08Y02P20/52Y02P30/20Y02P30/40
Inventor 刘中民于政锡朱书魁杨越
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI