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Method for pretreating catalyzer for making methanol or dimethyl ether into low-carbon olefin

A low-carbon olefin and catalyst technology, which is applied in the field of catalyst pretreatment, can solve the problem of deactivation and other problems, and achieve the effect of improving selectivity

Active Publication Date: 2012-04-11
FUDE BEIJING CHEM & IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the early 1980s, UCC successfully developed the SAPO series of molecular sieves, among which the SAPO-34 molecular sieve catalyst showed excellent catalytic performance when used in the methanol-to-olefins (MTO) reaction, with high selectivity for low-carbon olefins, And the activity is very high, but the catalyst loses its activity after being used for a period of time due to coke on the surface area of ​​the catalyst

Method used

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  • Method for pretreating catalyzer for making methanol or dimethyl ether into low-carbon olefin

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Catalyst pretreatment: Add 10g of fresh SAPO-34 catalyst into a fixed-bed reactor with an inner diameter of 30mm. Based on the weight of the catalyst, the initial carbon content of the catalyst is 0, the reaction temperature is 350°C, and the absolute pressure is 1MPa. First use high-purity N2 to purge for 30 minutes, the nitrogen flow rate is 100ml / min, and then add the pretreatment gas from the bottom of the pretreatment reactor. The composition of the pretreatment gas is ethylene, and its mass space velocity is 0.2 / h. 20min, and then purging with high-purity N2 for 30min, the carbon content of the treated catalyst is shown in Table 1.

[0036]Catalyst performance evaluation: Put the pretreated catalyst into a quartz tube fluidized bed reactor with an inner diameter of 20mm, maintain the reaction temperature at 450°C, and the absolute pressure at 0.15MPa. The raw material methanol is vaporized by the preheater and then passed into the reaction In the reactor, the mass...

Embodiment 2

[0038] Catalyst pretreatment: Add 10g of regenerated SAPO-34 catalyst into a quartz tube fluidized bed reactor with an inner diameter of 20mm. Based on the weight of the catalyst, the initial carbon content of the catalyst is 0.1%, and the reaction temperature is 450°C. Absolute The pressure is 0.15MPa, first purging with high-purity N2 for 30min, the nitrogen flow rate is 300ml / min, and then the pretreatment gas is added from the bottom of the pretreatment reactor, the composition of the pretreatment gas is propylene, and its mass space velocity is 1.5 / h , the feeding time continued for 8 minutes, and then purged with high-purity N2 for 30 minutes. The carbon content of the treated catalyst was shown in Table 1.

[0039] The catalyst performance evaluation method is the same as in Example 1, and the diene selectivity in the gas phase product is shown in Table 1.

Embodiment 3

[0041] Catalyst pretreatment: Add 10g of regenerated SAPO-34 catalyst into a quartz tube fluidized bed reactor with an inner diameter of 20mm. Based on the weight of the catalyst, the initial carbon content of the catalyst is 0.1%, and the reaction temperature is 500°C. Absolute The pressure is 0.15MPa, first purged with high-purity N2 for 30min, the nitrogen flow rate is 300ml / min, and then the pretreatment gas is added from the bottom of the pretreatment reactor. The composition of the pretreatment gas is 1-butene, and its mass space velocity is 2 / h, the feeding time continued for 5 minutes, and then purged with high-purity N2 for 30 minutes. The carbon content of the catalyst after treatment is shown in Table 1.

[0042] The catalyst performance evaluation method is the same as in Example 1, and the diene selectivity in the gas phase product is shown in Table 1.

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Abstract

The invention relates to a method for pretreating a catalyzer for making methanol or dimethyl ether into low-carbon olefin, comprising the step: leading pretreatment gas to a pretreatment reactor containing a catalyzer to pretreat the catalyzer so as to enable the surface of the inner bore of the fresh or regenerative aluminosilicophosphate catalyzer to be covered with certain coke in advance; covering active sites with relatively high activity but relatively poor selectivity in the structure of a molecular sieve and reducing the diameter of the inner bore of the molecular sieve; reducing theselectivity of the catalyzer on olefin and high-carbon olefin, so that the catalyzer has better selectivity to ethene and propene when catalyzing methanol or dimethyl ether to prepare low-carbon olefin. The pretreated catalyzer can cross over the earlier stage of the induction period that the catalyzer which is not treated must pass, enabling the catalyzer to be in the optimal operating state. Using the same amount of raw material can obtain more ethene and propene by adopting the method.

Description

technical field [0001] The invention relates to a method for pretreating a catalyst used for preparing low-carbon olefins from methanol or dimethyl ether, and belongs to the technical field of chemical material preparation. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important chemical raw materials. At present, an important way to produce low-carbon olefins such as ethylene and propylene is to obtain them by cracking light oils such as naphtha and light diesel oil. Naphtha and light diesel oil are mainly derived from petroleum. With the gradual shortage of petroleum resources, the technical route of producing ethylene and propylene from abundant coal and natural gas has attracted more and more attention at home and abroad. [0003] In 1976, Mobile Company developed the methanol-to-gasoline (MTG) process using ZSM-5 mesoporous zeolite molecular sieve as a catalyst, which was mainly used to synthesize gasoline from methanol. At the sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/00B01J29/85C07C11/02C07C1/20C07C11/04C07C11/06
CPCB01J2229/34B01J2229/12B01J29/85B01J37/084C07C1/20Y02P30/20Y02P30/40C07C11/02
Inventor 魏小波梅岭刘伟伟
Owner FUDE BEIJING CHEM & IND
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