Method for preparing p-xylene through methanol/dimethyl ether conversion

A p-xylene and dimethyl ether technology, applied in the field of p-xylene preparation, can solve the problems of low market value and complicated products

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

[0006] The aromatics obtained in the above process and method for preparing aromatics by methanol conversion are all mixed aromatics, the products are complicated, and the market value is low

Method used

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  • Method for preparing p-xylene through methanol/dimethyl ether conversion
  • Method for preparing p-xylene through methanol/dimethyl ether conversion
  • Method for preparing p-xylene through methanol/dimethyl ether conversion

Examples

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preparation example Construction

[0028] The present invention uses the preparation method of catalyst, wherein the siloxane compound is shown in the following formula:

[0029]

[0030] where R 1 , R 2 , R 3 and R 4 is an alkyl group of 1-10 carbon atoms.

[0031] The invention uses a catalyst preparation method, wherein the siloxane-based compound is ethyl silicate.

[0032] The reaction mode of the present invention is a contact reaction between the reaction material and the catalyst, the reaction temperature range is 350-550°C, the preferred temperature range is 400-500°C; the reaction pressure is 0-2MPa, preferably 0-1MPa; methanol / dimethyl Ether feed weight space velocity is 0.1-20h -1 , preferably 1-10h -1 . The selectivity of p-xylene in the reaction aromatic products is greater than 80wt%, and the selectivity of p-xylene among xylene isomers is greater than 99wt%.

Embodiment 1

[0034] Embodiment 1 fixed-bed catalyst preparation

[0035] 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.

[0036] 2) Take 20 g of the HZSM-5 zeolite molecular sieve prepared in step 1) and form it into tablets, obtain a 40-60 mesh sample after crushing and screening, divide it into two parts, and use two kinds of nitric acid with different mass concentrations of 3% and 9% respectively Zinc [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 ℃ dry...

Embodiment 2

[0037] Embodiment 2 fixed-bed catalyst preparation

[0038] Get 20g of the HZSM-5 zeolite molecular sieve prepared in Example 1 for tablet molding, obtain a 40-60 mesh sample after crushing and screening, divide it into two parts, and 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 The upper layer liquid was dried at 120°C and calcined in air at 550°C for 6 hours to obtain the HZSM-5 catalyst jointly modified by metal and silanization, and the Mo content in the catalyst was about 1wt% and 3wt%, respectively. The two catalysts were named MTA-03 and MTA-04, respectively.

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Abstract

The invention provides a method for preparing p-xylene through methanol/dimethyl ether conversion. The method adopts a zeolite catalyst modified with metal and silanization to directly prepare high-selectivity p-xylene through methanol/dimethyl ether conversion. The selectivity of p-xylene in aromatic products of methanol/dimethyl ether conversion 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 aromatics by converting methanol / dimethyl ether, in particular to a method for preparing p-xylene from methanol / dimethyl ether with high selectivity. 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 high-purity p-xylene cannot be obtained by ordinary distillati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C1/20B01J29/06B01J29/40B01J29/48
CPCY02P20/52
Inventor 刘中民许磊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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