ZSM-5 type molecular sieve for catalyst for reaction for preparing propylene from methanol and/or dimethyl ether

A technology of ZSM-5 and molecular sieve, which is applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc., can solve the problems of low propylene selectivity and low mass ratio of propylene to ethylene, and achieve high propylene selectivity and high P /E ratio, the effect of reducing energy consumption

Active Publication Date: 2010-01-13
DATANG INT CHEM TECH RESINST
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Problems solved by technology

[0005] Therefore, the object of the present invention is to provide a kind of new small grain ZSM-5 catalyst and synthetic method thereof, solve the problem that MTP or DTP reaction exists in the prior art Technical problems of low propylene selectivity and low mass ratio of propylene to ethylene (P / E)

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  • ZSM-5 type molecular sieve for catalyst for reaction for preparing propylene from methanol and/or dimethyl ether
  • ZSM-5 type molecular sieve for catalyst for reaction for preparing propylene from methanol and/or dimethyl ether
  • ZSM-5 type molecular sieve for catalyst for reaction for preparing propylene from methanol and/or dimethyl ether

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with specific embodiments, and the given examples are only for clarifying the present invention, not for limiting the scope of the present invention.

[0037] The ZSM-5 catalyst synthesized according to the raw materials and conditions recorded in Table 1 and Table 2 was calcined and ammonium exchanged to obtain hydrogen-form ZSM-5, which was pressed into tablets and sieved to 20-40 mesh, and evaluated on a fixed-bed reaction device . Catalytic evaluation conditions are: methanol or dimethyl ether and deionized water mixed feed, its mass ratio is methanol and / or dimethyl ether: water = 2: 1, and its liquid space velocity is 1 hour -1 , the amount of catalyst used is 3g, the reaction temperature is 480°C, and the pressure of the reaction system is less than 50 kPa. The reaction product is detected by FID, and the catalytic performance and physicochemical properties of the catalyst are listed in...

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Abstract

The invention provides a ZSM-5 type molecular sieve for a catalyst for a reaction for preparing propylene from methanol and/or dimethyl ether, which has a silica alumina ratio of 250-1,150 and a grain diameter of 65-250nm. A preparation method of the molecular sieve comprises the following steps: (1) mixing an aluminum source and an organic directing agent and stirring an obtained mixture at constant temperature of 0-30 DEG C for 2-24 hours; (2) adding a silicon source and an organic addition agent to the mixed solution obtained in the step (1) and continuing stirring the mixed solution to obtain gel; (3) stirring the gel obtained in the step (2) at 35-95 DEG C and then carrying out a crystallization reaction for 24-240 hours at 60-200 DEG C, wherein in the raw materials for synthesizing the molecular sieve, and the molar ratio of OH<-1> to SO2 to AL2O3 to H2O to the organic directing agent to the organic directing agent is (0.1-0.35):1:(0.0005-0.01):(10-25):(0.1-0.6):(0.5-8). The ZSM-5 type catalyst has the characteristics of controllable grain size, adjustable silica alumina ratio, high dispersity, and the like and has higher propylene selectivity and P/E ratio in the reaction for preparing low carbon olefin from the methanol and/or the dimethyl ether.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a ZSM-5 molecular sieve and a preparation method thereof, in particular to a small-grain ZSM-5 molecular sieve used as a catalyst for preparing propylene reaction with methanol and / or dimethyl ether as raw materials and its preparation method. Background technique [0002] With the continuous development of the global economy, the demand for propylene as an important petrochemical raw material is on the rise, and the problem of propylene shortage is becoming increasingly prominent. Propylene is mainly derived from petroleum. With the sharp increase in global oil prices and the depletion of petroleum energy in the future, new propylene sources and application technology issues have attracted widespread attention. From a strategic point of view, using methanol or dimethyl ether as raw material to produce propylene (MTP or DTP) can broaden raw material channels, adjust the structur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38C01B39/40C07C11/06C07C1/20B01J29/40
CPCY02P20/52
Inventor 李春启李德炳梅长松陈爱平忻仕河程晓维汪靖龙英才
Owner DATANG INT CHEM TECH RESINST
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