High yield preparation method of paraxylene by methanol/dimethyl ether conversion

A technology of p-xylene and dimethyl ether, which is applied in the field of methanol/dimethyl ether conversion to produce p-xylene with high yield, which can solve the problems of low market value and complicated products

Inactive Publication Date: 2009-12-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The aromatics obtained in the above process and method for preparing aromatics by met...

Method used

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  • High yield preparation method of paraxylene by methanol/dimethyl ether conversion
  • High yield preparation method of paraxylene by methanol/dimethyl ether conversion
  • High yield preparation method of paraxylene by methanol/dimethyl ether conversion

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preparation example Construction

[0029] The present invention uses the preparation method of catalyst, wherein the siloxane compound is shown in the following formula:

[0030]

[0031] where R 1 , R 2 , R 3 and R 4 is an alkyl group of 1-10 carbon atoms.

[0032] The invention uses a catalyst preparation method, wherein the siloxane-based compound is ethyl silicate.

[0033] The reaction mode of the present invention is the contact reaction between the reaction material and the catalyst, the reaction temperature is 350-550°C, preferably 400-500°C; the reaction pressure is 0-2MPa, preferably 0-1MPa; the methanol / dimethyl ether feed weight The air speed is 0.1-20h -1 , preferably 1-10h -1 . When the content of toluene or benzene in the methanol / dimethyl ether raw material is not more than 10wt%, the content of aromatics in the reaction product can reach more than 50wt%, wherein the content of p-xylene in aromatics is greater than 80wt%, and p-xylene is in xylene isomers The selectivity is greater th...

Embodiment 1

[0035] Embodiment 1 fixed-bed catalyst preparation

[0036] 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 the template agent, exchange 4 times with a 0.5 molar equivalent ammonium nitrate solution in a water bath at 80°C, dry in air at 120°C after the exchange, and roast at 550°C for 3 hours to obtain HZSM- 5 Zeolite molecular sieves.

[0037] 2) Take 20 g of the HZSM-5 zeolite molecular sieve prepared in step 1) for tablet molding, obtain a 40-60 mesh sample after crushing and screening, and use a mass concentration of 9% zinc nitrate [Zn(NO 3 ) 2 ] solution at room temperature for 4 hours, after drying at 120°C, roasting in air at 550°C for 6 hours; using orthoethyl silicate (TEOS) to impregnate zinc-modified HZSM-5 zeolite molecular sieve at room temperature for 24 hours, and pour out the upper liquid for 120 ℃ drying, 550 ℃ air roasting for 6 hours to obtain the HZSM-5 catalyst jo...

Embodiment 2

[0038] Embodiment 2 fixed-bed catalyst preparation

[0039] Get 20g of the HZSM-5 zeolite molecular sieve prepared in step 1) of Example 1 for tablet molding, obtain a 40-60 mesh sample after crushing and screening, use molybdenum nitrate [Mo(NO 3 ) 3 ] The solution was impregnated with HZSM-5 molecular sieve at room temperature for 4 hours, and after drying at 120°C, it was roasted in air at 550°C for 6 hours; the HZSM-5 zeolite molecular sieve after molybdenum modification was impregnated with orthoethyl silicate (TEOS) at room temperature for 24 hours, and poured out After the upper liquid was dried at 120°C and baked in air at 550°C for 6 hours, a HZSM-5 catalyst jointly modified by molybdenum and silanization was obtained. The Mo content in the catalyst was about 3wt%, and the catalyst was named MTA-07.

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Abstract

The invention relates to a high yield preparation method of paraxylene by methanol/dimethyl ether conversion and the method can increase the yield of paraxylene in the converted products of methanol/dimethyl ether by adopting molecular sieve based catalyst which is modified with metals or through silylanization and adding aromatic hydrocarbons in the raw materials. The aromatic hydrocarbons is the separated benzene and/or toluene which is generated through the methanol/dimethyl ether conversion reaction and part or whole of aromatic hydrocarbons is recycled in the reaction system; otherwise, additional benzene and/or toluene is added in the raw materials. By adopting the method, the content of aromatic hydrocarbons in the products of the methanol/dimethyl ether conversion reaction can be more than 50wt%; wherein, the content of paraxylene in aromatic hydrocarbons is more than 80wt% and the selectivity of paraxylene in xylene isomers is more than 99wt%.

Description

technical field [0001] The invention relates to a technology for preparing p-xylene with high yield by converting methanol / dimethyl ether, in particular to improving the yield of p-xylene in methanol / dimethyl ether conversion products by adding aromatic hydrocarbons to raw materials. Background technique [0002] Para-xylene is the basic raw material for the synthesis of polyester (PET). 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 hi...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88B01J31/02B01J29/40B01J29/48
CPCY02P20/52
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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