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Method for preparing light olefin by dehydrating oxygen compound

A technology of compounds and carbon olefins, which is applied in the field of dehydration of oxygen-containing compounds to produce low-carbon olefins, can solve the problems of low yield of low-carbon olefins and low catalyst activity, and achieve improved selectivity, tight bonding between grains, and reduced carbon deposition and other side effects

Active Publication Date: 2013-12-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is the problem of low catalyst activity and low yield of low-carbon olefins existing in the existing technology of dehydration of oxygen-containing compounds to produce low-carbon olefins, and a new method for producing low-carbon olefins by methanol dehydration is provided

Method used

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  • Method for preparing light olefin by dehydrating oxygen compound
  • Method for preparing light olefin by dehydrating oxygen compound
  • Method for preparing light olefin by dehydrating oxygen compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 60 grams of ZSM-5 molecular sieve with a silicon-aluminum ratio (molecular ratio, the same below) of 30, add 40 grams of silica sol with a weight percentage of 40%, mix and stir evenly, and then add 1 mol / liter of sodium hydroxide The solution is 10 ml, mixed and stirred evenly, and then the agent bar is formed, and the formed catalyst is dried at 80°C for 3 hours, and then put into an autoclave containing water at the bottom of the liner. The catalyst and liquid water are not in contact. After crystallization at 170°C for 60 hours, take it out, then wash it twice, put it in an oven for 3 hours at 120°C, put it into a muffle furnace and bake it at 400°C for 2 hours, then at 550°C for 3 hours to obtain non-sticky Binder ZSM-5 catalyst. The XRD spectrum of the prepared catalyst shows a pure ZSM-5 phase. The scanning electron microscope picture of the prepared catalyst shows pure ZSM-5 crystal grains, and there is almost no binder in the amorphous state. The binder ...

Embodiment 2

[0029] According to the method of Chinese patent CN101428233A, the ZSM-5 / beta zeolite mixed crystal molecular sieve with a silicon-aluminum ratio of 40 is prepared. Take 60 grams of ZSM-5 / beta zeolite, add 40 grams of silica sol with a weight percentage of 40%, mix and stir evenly, then add 2 grams of magnesium oxide, mix and stir evenly, and then form the agent bar, and the forming catalyst is heated at 80°C Dry for 3 hours, then put it into an autoclave containing water at the bottom of the liner. The catalyst and liquid water are not in contact. After the autoclave is sealed, put it into the oven. After crystallization at 165°C for 80 hours, take it out, then wash it twice, and put it in the oven Dry at 120°C for 3 hours, place in a muffle furnace for calcination at 400°C for 2 hours, and 550°C for 3 hours to prepare a binder-free ZSM-5 / β zeolite catalyst as shown in Table 1. The XRD pattern of the prepared catalyst shows that ZSM-5 and β zeolite intergrowth phase. The sca...

Embodiment 3～16

[0031] Take mordenite with a silicon-aluminum ratio of 20, 60 grams of Y zeolite with a silicon-aluminum ratio of 10, MCM-22 molecular sieve with a silicon-aluminum ratio of 40, ZSM-5 / mordenite symbiotic molecular sieve with a silicon-aluminum ratio of 20, and silicon-aluminum ratio ZSM-5 / beta zeolite / Y zeolite symbiotic molecular sieve with a ratio of 40, ZSM-5 / Y zeolite / mordenite symbiotic molecular sieve with a silicon-aluminum ratio of 20, ZSM-23 with a silicon-aluminum ratio of 20, and a silicon-aluminum ratio of 30 ZSM-11, MCM-49 with a silicon-aluminum ratio of 40, MCM-56 with a silicon-aluminum ratio of 60, ZSM-5 / Y symbiotic molecular sieves with a silicon-aluminum ratio of 20, MCM-22 / mordenite with a silicon-aluminum ratio of 40 , the ZSM-5 / Magadiite that the silicon-aluminum ratio is 200, the ZSM-5 / beta zeolite / mordenite that the silicon-aluminum ratio is 30, raw material proportioning is such as table 1, according to the method for embodiment 1, obtains binderless mo...

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Abstract

The invention relates to a method for preparing light olefin by dehydrating oxygen compound, mainly solving the problems that activity of a catalyst is low and yield of the light olefin is low in the traditional technology for preparing the light olefin through catalytic pyrolysis. In the invention, a method for preparing the light olefin by dehydrating the oxygen compound is adopted, a binder-free molecular sieve is taken as a catalyst, methanol or dimethyl ether is taken as raw material, the raw material is contacted with the catalyst by virtue of a catalyst bed and reaction is carried out to generate the light olefin under the conditions that reaction temperature is 400-600 DEG C, reaction gauge pressure is 0.001-0.5MPa, reaction weight airspeed is 0.1-4 / hour and weight ratio of water to methanol is (0.1-3): 1, wherein pore volume of the binder-free molecular sieve catalyst is 0.1-0.3ml / g, average pore size is 50-70nm, porosity factor is 20-30%, and content of the binder is 0-5%; and strength of the catalyst after moulding and sintering is 60-200N. By adopting the technical scheme, the problems are solved, and the method provided by the invention can be applied to industrial production of the light olefin prepared by dehydrating the oxygen compound.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins by dehydrating oxygen-containing compounds. technical background [0002] As the leader of the petrochemical industry, the low-carbon olefin industry plays a pivotal role in the development of the national economy. With the development of society, the market demand for low-carbon olefins in my country has increased sharply, and the import volume of low-carbon olefins and their downstream products has increased year by year, and the market share of domestic products is less than half. At present, the world produces more than 100 million tons of ethylene per year, mainly using naphtha (or ethane) as raw material and using steam pyrolysis technology (at a temperature of about 800°C) to produce, and its output exceeds 90% of the total output. However, steam cracking requires high reaction temperature, high energy consumption, expensive high-temperature-resistant alloy steel molecular sieve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/24C07C11/04C07C11/06B01J29/40B01J29/18B01J29/08B01J29/70B01J29/80
CPCC07C1/20Y02P20/52Y02P30/20Y02P30/40C07C11/04C07C11/06
Inventor 马广伟张惠明
Owner CHINA PETROLEUM & CHEM CORP
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