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Catalyst for producing light olefins through methanol and preparation method thereof

A low-carbon olefin and catalyst technology, which is applied in the field of catalyst and its preparation, can solve the problems of increasing catalyst wear, reducing service life, poor olefin selectivity, etc., and achieves the effects of improving methanol conversion rate, long service life and high catalytic activity

Inactive Publication Date: 2013-01-09
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly three types of catalysts suitable for the MTO process: 1) SAPO-34 molecular sieve (model MTO-100), but because the catalyst needs frequent regeneration, the MTO process must use a continuous reaction-regeneration fluidized bed reactor to increase the catalyst 2) ZSM-5 zeolite catalyst, low coking, no need for continuous regeneration, long life, but relatively poor olefin selectivity; 3) DO-123 catalyst, the main raw material is dimethyl ether, the Catalysts have problems such as short service life and high preparation costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Weigh 5g of ZSM-5 carrier, degas and dehydrate, vacuumize for 3 hours, and the vacuum degree reaches 650mm as the pressure difference between the two ends of the U-shaped manometer;

[0020] 2) Prepare 10.5ml of 1g / L NiNO 3 solution, prepare 3ml 10g / L of Zn(NO 3 ) 2 solution, prepare 2.5ml of 10g / L LiNO 3 After solution, prepare 1ml H 3 PO 4 solution, mix the four;

[0021] 3) Add the mixed solution prepared in step 2) to the vacuum-evacuated carrier in step 1), stir for 18 hours, shake in a water bath at 50°C until dry, and then calcinate at 600°C for 2 hours to obtain methanol-to-low-carbon olefins catalyst.

[0022] The catalyst is used in the reaction of methanol conversion to produce low-carbon olefins: the conversion rate of methanol is 98.87%, and the carbon-based selectivity of each product in the gas phase product is C 1 0 2.87%, C 2 0 0.05%, C 2 ＝ 36.44%, C 3 0 2.10%, C 3 ＝ 35.07%, C 4 0 6.10%, C 4 ＝ 17.36%, C 2 ＝ ~C 4 ＝ 88.87%, C in...

Embodiment 2

[0024] 1) Weigh 5g of SAPO-34 carrier, degas and dehydrate, vacuumize for 2 hours, and the vacuum degree reaches the pressure difference between the two ends of the U-shaped manometer is 720mm;

[0025] 2) Prepare 4.1ml of 10g / L Ca(NO 3 ) 2 solution, prepare 1.2ml of 1g / L Na 2 CO 3 solution, prepare 9.86ml of 1g / L LiNO 3 After the solution, prepare 3.1ml of 10g / L Mn(NO 3 ) 2 The solution mixes the four;

[0026] 3) Add the mixed solution prepared in step 2) to the vacuum-evacuated carrier in step 1), stir for 24 hours, shake in a water bath at 45°C until dry, and then calcinate at 500°C for 3 hours to obtain methanol-to-low-carbon olefins catalyst.

[0027] The catalyst is used in the reaction of methanol conversion to produce low-carbon olefins: the conversion rate of methanol is 97.25%, and the carbon group selectivity of each product in the gas phase product is C 1 0 2.57%, C 2 0 0.04%, C 2 ＝ 39.63%, C 3 0 1.88%, C 3 ＝ 35.34%, C 4 0 6.61%, C 4 ＝ 13.93%,...

Embodiment 3

[0029] 1) Weigh 5g of MCM-41 carrier, degas and dehydrate, vacuumize for 4 hours, and the vacuum degree reaches 600mm between the pressure difference between the two ends of the U-shaped manometer;

[0030] 2) Prepare 7.3ml of 10g / L Cu(NO 3 ) 2 Solution, prepare 8.8ml 10g / L of K 2 CO 3 After the solution, prepare 10.8ml of 20g / L Fe(NO 3 ) 3 solution, mix the three;

[0031] 3) Add the mixed solution prepared in step 2) to the vacuum-evacuated carrier in step 1), stir for 12 hours, shake in a water bath at 50°C until dry, and then calcinate at 400°C for 3 hours to obtain methanol-to-low-carbon olefins catalyst.

[0032] The catalyst is used in the reaction of methanol conversion to produce low-carbon olefins: the conversion rate of methanol is 94.89%, and the carbon group selectivity of each product in the gas phase product is C 1 0 2.04%, C 2 0 0.26%, C 2 ＝ 35.79%, C 3 0 1.87%, C 3 ＝ 36.26%, C 4 0 6.34%, C 4 ＝ 17.43%, C 2 ＝ ~C 4 ＝ 89.48%, C in the liqui...

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PUM

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Abstract

The invention discloses a catalyst for producing light olefins through methanol and preparation method thereof which belongs to the field of coal chemical industry. The current catalyst for producing light olefins through methanol needs to be frequently regenerated under a reaction temperature, and has the disadvantages of short service life, high cost of manufacture and complex preparation process. The catalyst proposed in the invention consists of 95-99.99 wt percent of carrier and 0.01-5wt percent of active components. The invention adopts a vacuum impregnation method to load metal components and solid acid onto the carrier, dry and calcine to obtain the catalyst for producing light olefins through methanol. The invention has the advantages of high catalytic activity, high selection onlight olefins, gentle reaction conditions, low coking, long service life, simple preparation process, being suitable for forming carrier beneficial to industrialization, and low cost, etc.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a catalyst for producing low-carbon olefins from methanol and a preparation method thereof. Background technique [0002] As important basic raw materials in the modern chemical industry, ethylene and propylene are in great demand. Ethylene is mainly obtained by steam cracking of light hydrocarbons and naphtha, etc., and propylene is mainly obtained from steam cracking ethylene units and catalytic cracking units of oil refining. However, since petroleum is a non-renewable resource, countries around the world have begun to devote themselves to the development of non-petroleum routes to ethylene and propylene-based low-carbon olefins. Among them, the process route of converting coal or natural gas into methanol through synthesis gas, and then converting methanol into light olefins has received extensive attention. For the methanol-to-light olefins (MTO) process, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/064B01J29/85B01J29/46B01J23/06B01J23/78C07C1/20
CPCY02P20/52
Inventor 张敬畅张雷杨秀英佟春梅曹维良
Owner BEIJING UNIV OF CHEM TECH