Method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol/dimethyl ether

A technology for aromatics and propylene, which is applied in the field of co-production of aromatics and propylene from methanol/dimethyl ether, can solve the problems of high cost of separating ethylene, low content, difficult application and promotion, etc., so as to reduce production investment, reduce separation difficulty, and improve economic efficiency. sexual effect

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

Problems solved by technology

In any method, the content of the main product of methanol conversion is low; for example, the selectivity of ethylene and propylene in the production of low-carbon olefins from methanol conversion is poor, and the cost of separating ethylene is high, and it is necessary to build a supporting polymerization ethylene device, which requires a large investment; butene components are complex, Low content and low market value; mixed aromatics produced by methanol direct conversion have low content and low market value; producing low-carbon olefins and aromatics at the same time, the entire separation system is complex and large investment and other reasons
This makes it difficult for these processes to be applied in industry
At present, there is no technology to produce aromatics (benzene, toluene, xylene) co-production of propylene using methanol

Method used

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  • Method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol/dimethyl ether
  • Method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol/dimethyl ether
  • Method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol/dimethyl ether

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preparation example Construction

[0029] In the method for the simultaneous co-production of propylene for the preparation of aromatics provided by the present invention, the catalyst in the first reactor adopts a zeolite molecular sieve catalyst jointly modified by metal and silanization. Alkyl compounds modify the surface acidity and pore structure, so as to obtain a catalyst for the preparation of p-xylene with high selectivity for the conversion of methanol / dimethyl ether, and co-produce low-carbon olefins such as ethylene propylene. The catalyst in the second reactor adopts metal-modified zeolite molecular sieve catalyst.

[0030] The method for the simultaneous co-production of propylene in the preparation of aromatics provided by the invention, its technological process schematic diagram is as follows figure 1 shown, wherein, a is a mixed hydrocarbon with carbon number less than or equal to 4; a 1 For mixed hydrocarbons; a2 is propylene; b is a mixture of aromatic hydrocarbons; b 1 is aromatic mixture...

Embodiment 1

[0034] 1) Preparation of modified zeolite molecular sieve catalyst

[0035] The original powder of ZSM-5 zeolite molecular sieve (purchased from Catalyst Factory of Nankai University) (SiO 2 / Al 2 o 3 =50) Roasting at 550° C. to remove template agent, exchange with ammonium nitrate solution 4 times 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] a. Preparation of catalyst MTA-06

[0037] 20g of the above-mentioned HZSM-5 zeolite molecular sieves were pressed into tablets, and a 40-60 mesh sample was obtained after crushing and screening, and zinc nitrate [Zn(NO 3 ) 2 ·6H 2 O] solution at room temperature for 4 hours, after drying at 120°C and roasting in air at 550°C for 6 hours; use orthoethyl silicate (TEOS) to impregnate zinc-modified HZSM-5 zeolite molecular sieve at room temperature for 24 hours, and pour out the upper liquid After drying at 120° C. and roasting in air at...

Embodiment 2

[0054] 1) Preparation of modified zeolite molecular sieve catalyst

[0055] The original powder of ZSM-5 zeolite molecular sieve (purchased from Catalyst Factory of Nankai University) (SiO 2 / Al 2 o 3 =50) Roasting at 550° C. to remove template agent, exchange with ammonium nitrate solution 4 times 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.

[0056] a. Preparation of catalyst MTA-07

[0057] 20g of the above-mentioned HZSM-5 zeolite molecular sieve was pressed into tablets, and a 40-60 mesh sample was obtained after crushing and screening, and molybdenum nitrate [Mo(NO 3 ) 3 ·5H 2 O] The solution was impregnated with HZSM-5 molecular sieve at room temperature for 4 hours, dried at 120°C and then calcined in air at 550°C for 6 hours. The molybdenum-modified HZSM-5 zeolite molecular sieve was impregnated with tetraethyl orthosilicate (TEOS) at room temperature for 24 hours. After po...

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Abstract

The invention discloses a method for preparing aromatic hydrocarbons and propylene simultaneously employing methanol / dimethyl ether, comprising the following steps: 1) placing raw materials containing methanol or / and dimethyl ether, metals and molecular sieve based catalyst which is modified through silanizing in a first fixed bed reactor to perform catalytic reaction; 2) separating the products obtained in step 1) to obtain propylene, then placing propylene in a second fixed bed reactor with molecular sieve based catalyst which is modified by using metals to react, then performing aromatization on the obtained product in step 1) and obtaining aromatic hydrocarbons; then separating to obtain toluene and sending toluene back to the outlet of the first fixed bed reactor as a raw material. In the method, methanol is converted and prepared to aromatic hydrocarbons while propylene is produced at the same time and the content of paraxylene in aromatic hydrocarbons is high. In the products prepared by the method, the content of propylene can reach above 20%, the content of aromatic hydrocarbons can reach above 58wt% and the content of paraxylene in aromatic hydrocarbons is more than 35wt%.

Description

technical field [0001] The invention is a method for preparing aromatics (benzene, toluene, xylene) and co-producing propylene with methanol / dimethyl ether. Background technique [0002] The technology of preparing aromatics from methanol / dimethyl ether is a new way to prepare aromatics from coal or natural gas. Aromatics are prepared by direct aromatization of methanol / dimethyl ether on a metal and molecular sieve composite catalyst. ZSM-5 molecular sieve has a unique effect on the conversion of methanol into aromatics. In the methanol-to-gasoline (MTG) reaction, ZSM-5 can effectively convert methanol into hydrocarbons with the boiling range of gasoline. The synthetic gasoline contains 60% Aromatics around. On acidic molecular sieves, methanol can be converted into alkanes, alkenes and aromatics, etc. Different types of molecular sieves have different product ratios. Dehydroaromatization of alkanes and alkenes is an effective method to increase the yield of aromatics. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C15/02C07C11/06C07C2/00B01J31/26B01J31/02B01J31/34B01J31/32B01J29/40B01J29/48
CPCY02P20/52
Inventor 梅永刚欧书能马跃龙郑长波许磊
Owner CHINA NAT OFFSHORE OIL CORP
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