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Method for preparing paraxylene and propylene by methanol and/or dimethyl ether

A technology of p-xylene and dimethyl ether, applied in the field of chemical industry, can solve the problems of affecting economy, investment and energy consumption, and achieve the effect of improving economy and avoiding high costs

Active Publication Date: 2016-02-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that to obtain high-purity ethylene products, cryogenic separation technology must be used, and the investment and energy consumption are large, which directly affects the economy of the process.

Method used

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  • Method for preparing paraxylene and propylene by methanol and/or dimethyl ether
  • Method for preparing paraxylene and propylene by methanol and/or dimethyl ether
  • Method for preparing paraxylene and propylene by methanol and/or dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Catalyst preparation: silver lanthanum and silane modified HZSM-5 molecular sieve catalyst and HZSM-11 Molecular sieve catalyst

[0072] 1) 500g ZSM-5 zeolite molecular sieve former powder (Fushun Petrochemical Company Catalyst Factory) (SiO 2 / Al 2 o 3 =68) and the former powder of 500gZSM-11 zeolite molecular sieve (Nankai University Catalyst Factory) (SiO 2 / Al 2 o 3 =50) were roasted at 550°C to remove the template agent, exchanged 4 times with a 0.5 molar equivalent ammonium nitrate solution in a water bath at 80°C, dried in air at 120°C after the exchange, and roasted at 550°C for 3 hours to obtain HZSM respectively -5. HZSM-11 zeolite molecular sieve.

[0073] 2) Take 100 g of HZSM-5 and HZSM-11 zeolite molecular sieves prepared in step 1) to form tablets respectively, obtain a 40-60 mesh sample after crushing and sieving, and use 6% mass concentration of silver nitrate (AgNO 3 ) solution at room temperature for 4 hours, poured out the upper liquid, dri...

Embodiment 2

[0077] p-xylene and propylene from methanol

[0078] according to figure 2 In the shown reaction process, the MTPP-08 catalyst prepared in Example 1 is loaded into the first reaction zone and the second reaction zone of the fixed reactor respectively (each reaction zone is 10 grams). The first reaction zone mainly carries out methanol aromatization reaction, and the product after the reaction enters the second reaction zone, and the mass space velocity of methanol feed is 2h -1 , the reaction temperature is 500°C. where the ethylene-rich C in the reaction product distribution 2 - The components and methanol enter the second reaction zone for reaction, wherein the ethylene / methanol (molar ratio) is 1 / 1, the reaction temperature is 400°C, and the second reaction zone carries out the alkylation reaction of ethylene and methanol.

[0079] Gas chromatography was used to analyze the mixed product composition of the first reaction zone and the second reaction zone on-line, and...

Embodiment 3

[0087] p-xylene and propylene from methanol

[0088] according to image 3 Or the reaction process shown in 4, the MTPP-08 and MTPP-09 catalyst prepared in embodiment 1 are respectively loaded into the first reaction zone and the second reaction zone (each reaction zone is 10 grams). The methanol aromatization reaction is carried out in the first reaction zone, and the mass space velocity of the methanol feed is 2h -1 , the reaction temperature is 500°C. The second reaction zone carries out the alkylation reaction of ethylene and methanol, according to the ethylene-rich C in the methanol conversion reaction product distribution in the comparative example 2 - The components and methanol enter into the second reaction zone for reaction, wherein the ethylene / methanol (molar ratio) is 1 / 1, and the reaction temperature is 400°C.

[0089] Adopt gas chromatograph on-line analysis first reaction zone and the second reaction zone mixed product composition, remove the product dist...

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Abstract

The invention relates to a method for preparing paraxylene and propylene by methanol and / or dimethyl ether. The method comprises the following steps: carrying out aromatization reaction on the the methanol and / or the dimethyl ether; carrying out alkylation reaction on ethylene, the methanol and / or the dimethyl ether; and coupling the two reactions. According to the method disclosed by the invention, components rich in ethylene in reaction by-products during preparation of the paraxylene by the methanol and / or the dimethyl ether in the presence of a catalyst are returned to a reaction system, then the alkylation reaction is carried out on the components, the methanol and / or the dimethyl ether, and the paraxylene and the propylene can be produced in a high-selectivity mode.

Description

technical field [0001] The invention relates to a method for preparing p-xylene and propylene by reacting methanol and / or dimethyl ether, which belongs to the field of chemical industry. Background technique [0002] Both p-xylene (PX) and propylene are important basic chemical raw materials. At present, p-xylene is mainly obtained through aromatics complex. First, naphtha is continuously reformed to obtain aromatics-containing reformed oil, and then through aromatics extraction, aromatics fractionation, disproportionation and alkylation, and xylene isomerization Chemical and adsorption separation units to maximize the production of PX. Since the content of p-xylene in the three isomers is thermodynamically controlled, p-xylene at C 8 Mixed aromatics only account for about 23%, so the entire PX production process has a large amount of material recycling, huge equipment, and high operating costs. In particular, the difference between the boiling points of the three isomers...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C2/86C07C11/06C07C15/08
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 刘中民许磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI