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Catalyst for producing propylene and propane by converting ethanol and its preparation method and application

A catalyst, ethanol technology, applied in chemical instruments and methods, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of unsatisfactory catalyst activity stability, low yields of propylene and propane, etc., and achieve good activity and stability. , The effect of high total yield and high single-pass yield

Inactive Publication Date: 2011-12-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of composite molecular sieve catalyst, to improve the low yield of propylene and propane in the existing ethanol conversion process, the catalyst activity stability is not ideal etc.

Method used

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  • Catalyst for producing propylene and propane by converting ethanol and its preparation method and application
  • Catalyst for producing propylene and propane by converting ethanol and its preparation method and application
  • Catalyst for producing propylene and propane by converting ethanol and its preparation method and application

Examples

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Effect test

Embodiment 1

[0027] Catalytic properties of HZSM-5 / SAPO-34 composite molecular sieve catalysts with different ratios prepared by mixing method to catalyze ethanol conversion to propylene under different reaction conditions. The preparation method of HZSM-5 / SAPO-34 composite molecular sieve catalyst is as follows: a certain amount of HZSM-5 (SiO 2 / Al 2 o 3 =50, molar ratio) molecular sieve powder and a certain amount of SAPO-34 molecular sieve powder are evenly mixed to make a HZSM-5 / SAPO-34 composite molecular sieve catalyst, which is pressed into tablets and pulverized into 20-40 mesh particles, and used for ethanol to propylene reaction. The mass ratios of HZSM-5 / SAPO-34 in the catalyst are 1, 2, 3, 4 and 5 respectively; the catalysts are recorded as Cat-1, Cat-2, Cat-3, Cat-4 and Cat-5 respectively. image 3 It is the X-ray diffraction pattern of the composite molecular sieve catalyst.

[0028]Cat-1, Cat-2, Cat-3, Cat-4 and Cat-5 catalysts are used in ethanol to propylene reaction, ...

Embodiment 2

[0032] The preparation of HZSM-5 / SAPO-34 composite molecular sieve catalyst by hydrothermal method and the situation when the prepared catalyst is used in ethanol to propylene reaction under various reaction conditions. The process of preparing HZSM-5 / SAPO-34 composite molecular sieve by hydrothermal method is as follows: a certain amount of water glass (SiO 2 content is 30 wt%), phosphoric acid (H 3 PO 4 , the content is 85 wt%), pseudo-boehmite (AlOOH), tetraethylammonium hydroxide (TEAOH, content 25 wt%), and deionized water are fully mixed under the condition of rapid stirring, and the SiO in the above mixture 2 : Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH=1 : 1 : 0.3 : 2.0 : 50.0, the pH of the mixture is 6.5. Then, a certain amount of HZSM-5 (SiO 2 / Al 2 o 3 =50, molar ratio) powder, and stir quickly to make it evenly mixed. By adjusting the added amount of HZSM-5, the ratio of HZSM-5 and SAPO-34 in the synthesized HZSM-5 / SAPO-34 composite molecular sieve was contro...

Embodiment 3

[0036] The reactions of ethanol to propylene using a catalyst bed with a temperature gradient and an isothermal catalyst bed are described respectively. The catalyst used is the Cat-4 catalyst prepared by the method described in Example 1. The reaction conditions for ethanol conversion on the catalyst bed with temperature distribution are: the temperature at the upper end of the catalyst bed is 510°C, and the temperature at the lower end of the catalyst bed is 550°C. The catalyst bed temperature gradient was 16 °C / cm, normal pressure, ethanol partial pressure was 20 kPa, and the total flow rate was 80 mL / min. The reaction conditions for ethanol conversion on an isothermal catalyst bed are: reaction temperature 550 °C, normal pressure, ethanol partial pressure 20 kPa, total flow rate 80 mL / min, the yield of propane, propylene and other products in the above process changes with time as attached Figure 5 shown. By adopting the technical solution provided by the invention, th...

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Abstract

The invention discloses a catalyst for ethanol conversion to produce propylene and propane. The catalyst is a composite molecular sieve catalyst containing MOR, HZSM-5, Beta, Y, SAPO-34, SAPO-31, SAPO-11, MCM-22, MCM -41. Two or more components of SBA-15 molecular sieves, which contain at least HZSM-5 and SAPO-34 molecular sieves, and the mass ratio of HZSM-5 and SAPO-34 molecular sieves is 0.2-5. The total yield of propylene and propane in the product obtained by using the catalyst of the present invention is high, and by-product ethylene and butene can be adjusted by changing the reaction conditions. The ratio of propylene / ethylene in the product is due to the temperature distribution of the catalyst bed, so The reaction heat effect generated by ethanol conversion is better dispersed and utilized, and there are no hot spots in the catalyst bed.

Description

technical field [0001] The invention relates to a catalyst for ethanol conversion to produce propylene and propane and a preparation method thereof. Specifically, the invention relates to a composite molecular sieve catalyst for ethanol conversion to produce propylene and propane and a preparation method thereof, belonging to the technical field of catalysts and their applications. Background technique [0002] Propylene is an important basic chemical raw material. In recent years, driven by the rapid growth in demand for propylene derivatives such as polypropylene, acrylonitrile, and acrylic acid, the demand for propylene has increased sharply; and the supply of propylene will remain in short supply for a long period of time in the future. At present, propylene is mainly produced in the process of petroleum steam cracking and catalytic cracking, and its output accounts for about 98% of the total output of propylene; The output is limited, and the cost of increasing propyle...

Claims

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Application Information

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IPC IPC(8): B01J29/85C07C11/06C07C9/08C07C1/20
CPCY02P20/52
Inventor 张昕段超周蕊华媛张贵泉张莉
Owner NORTHWEST UNIV
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