Method for preparing ethylene and propylene and co-producing p-xylene through methanol/dimethyl ether conversion

A technology of p-xylene and ethylene propylene, applied in the field of producing low-carbon olefins and aromatics, which can solve the problems of poor selectivity of ethylene propylene, low market value of mixed aromatics, difficulty in application and promotion, etc.

Inactive Publication Date: 2009-12-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of the main product of methanol conversion in any method is relatively low, such as the poor selectivity of ethylene and propylene in the production of low-carbon olefins from methanol conversion, and the low market value of mixed aromatics produced by direct conversion of methanol, which makes these processes difficult to industrialize. application promotion

Method used

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  • Method for preparing ethylene and propylene and co-producing p-xylene through methanol/dimethyl ether conversion
  • Method for preparing ethylene and propylene and co-producing p-xylene through methanol/dimethyl ether conversion
  • Method for preparing ethylene and propylene and co-producing p-xylene through methanol/dimethyl ether conversion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 fixed-bed catalyst preparation

[0029] 1) 500g ZSM-5 zeolite molecular sieve former powder (Nankai University Catalyst Factory) (SiO 2 / Al 2 o 3 =50) Roast at 550°C to remove template agent, exchange 4 times with 0.5 molar equivalent ammonium nitrate solution in 80°C water bath, dry in air at 120°C after exchange, and roast at 550°C for 3 hours to obtain HZSM-5 Zeolite molecular sieve.

[0030] 2) Take 20 g of the HZSM-5 zeolite molecular sieve prepared in step 1), impregnate it with tetraethyl orthosilicate (TEOS) at room temperature for 24 hours, pour out the upper liquid, dry it at 120°C, and roast it in air at 550°C for 6 hours to obtain a silanized modified zeolite. The permanent HZSM-5 catalyst is named MTOA-1.

Embodiment 2

[0031] Example 2 Fluidized bed catalyst preparation.

[0032] 1) Take 200 g of the HZSM-5 zeolite molecular sieve prepared in Example 1, impregnate it with tetraethyl orthosilicate (TEOS) at room temperature for 24 hours, pour out the upper liquid, dry it at 120°C, and roast it in the air at 550°C for 6 hours to obtain a silanized modified zeolite. Sexual HZSM-5 zeolite molecular sieve.

[0033] 2) Mix the modified HZSM-5 zeolite molecular sieve with kaolin, silica sol, aluminum sol and deionized water to form a slurry, and the dry basis mass ratio of molecular sieve to kaolin, silica sol and aluminum sol is 30:32:26:12 , The solid content of the slurry is about 35wt%. The slurry is aged at room temperature for 5 hours, passed through a colloid mill film, and then sprayed to form a microsphere catalyst with a particle size of 20-100 μm. The catalyst was named MTOA-2.

Embodiment 3

[0034] Embodiment 3 fixed bed reaction evaluation

[0035]The MTOA-1 catalyst prepared in Example 1 was used as the reaction catalyst, pressed into tablets, crushed and sieved to 40-60 meshes. 5g of catalysts were respectively loaded into a fixed bed reactor, treated in an air atmosphere at 550°C for 1 hour, and cooled down to reaction temperatures of 450°C and 500°C in a nitrogen atmosphere. Methanol is pumped into the reactor through a feed pump to contact and react with the catalyst. The raw material methanol feed weight space velocity is 2h -1 , The reaction product was analyzed online by Varian3800 gas chromatography, and the reaction results are shown in Table 1.

[0036] Under different reaction temperatures, the total selectivity of ethylene, propylene and p-xylene in the product (remove generated water) is 81.63wt% and 82.79wt% respectively, and ethylene and propylene are at C 1 -C 5 The contents of the components are 81.19wt% and 80.59wt%, the contents of p-xylen...

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Abstract

The invention provides a method for preparing ethylene and propylene and co-producing p-xylene through methanol / dimethyl ether conversion. The method adopts a silanization-modified zeolite catalyst to co-produce p-xylene as a main component in aromatic hydrocarbon while preparing ethylene and propylene through methanol conversion. The overall selectivity of ethylene, propylene and p-xylene in hydrocarbon products is more than 80 percent by weight. The selectivity of p-xylene in xylene isomers is more than 99 percent by weight.

Description

technical field [0001] The invention relates to a technology for preparing light olefins and aromatics from methanol / dimethyl ether, in particular to a method for preparing ethylene, propylene and p-xylene with high selectivity from methanol / dimethyl ether. Background technique [0002] Ethylene, propylene and p-xylene are the basic raw materials of modern chemical industry. At present, p-xylene production mainly uses toluene, C 9 Aromatic hydrocarbons and mixed xylenes are used as raw materials, and are produced through disproportionation, isomerization, adsorption separation or cryogenic separation. Since the p-xylene content in its products is thermodynamically controlled, p-xylene is at C 8 Mixed aromatics only account for about 20%. In the process, the amount of material circulation is large, the equipment is huge, and the operating cost is high. In particular, the difference between the boiling points of the three isomers of xylene is very small, and high-purity p-x...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C11/06C07C15/08C07C1/20B01J29/40
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 许磊刘中民袁翠峪赵银峰李铭芝梅永刚欧书能马跃龙郑长波
Owner CHINA NAT OFFSHORE OIL CORP
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