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Method for preparing molecular sieve solid acid catalyst used for preparing ethylene by ethanol dehydration

A solid acid catalyst, ethanol dehydration technology, applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., to achieve the effects of environmental friendliness, non-corrosive equipment, and easy operation

Inactive Publication Date: 2009-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing molecular sieve solid acid catalyst used for preparing ethylene by ethanol dehydration

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Embodiment 1

[0020] 10g of hydrogen-type ZSM-5, high-silicon ZSM-5 and beta molecular sieve with a silicon-to-aluminum ratio of 25 were impregnated in Fe with equal volume. 2 (SO 4 ) 3 solution (wherein, according to Fe 2 O 3 The mass ratio with molecular sieve is 10%), immersed at room temperature for 1 h, and then dried at 110 ° C; the dried catalyst was placed in a muffle furnace for pre-calcination for 3 h at a temperature of 350 ° C; Fe-modified catalyst was obtained; Fe-modified catalyst was obtained; Modified molecular sieve with 20ml of H with a concentration of 1mol / L 2 SO 4 The solution was impregnated, treated at room temperature for 30 min, and then dried at 110 °C; the dried catalyst was calcined in a muffle furnace for 3 h at a temperature of 600 °C; molecular sieve supported SO was obtained 4 2- / Fe 2 O 3 Acid catalyst, namely molecular sieve type solid acid catalyst prepared by impregnation method.

[0021] Take 4g of the catalyst prepared above and put it into a s...

Embodiment 2

[0026] In a closed hydrothermal kettle, Fe 2 (SO 4 ) 3 solution (wherein, according to Fe 2 O 3 The mass ratio with ZSM-5 is 15%) equal volume to impregnate 10g hydrogen-type ZSM-5 molecular sieve with a silicon-alumina ratio of 25, and the hydrothermal kettle is heated to 180°C in a closed state, and kept for 12h; then at 110°C After drying, the dried catalyst was calcined in a muffle furnace for 3 h at a temperature of 600 °C; ZSM-5 supported SO was obtained 4 2- / Fe 2 O 3 Acid catalyst, namely molecular sieve type solid acid catalyst prepared by hydrothermal treatment. Take 4g of the catalyst prepared above and load it into a stainless steel fixed-bed tubular reactor for catalytic reaction, the ethanol concentration is 10wt%, and the mass space velocity is 1.3h -1 , and the reaction temperature was 300 °C. Molecular sieve type solid acid catalyst The conversion rate of catalyzing ethanol dehydration to ethylene under this condition is 99.8%, and the selectivity of ...

Embodiment 3

[0028] 10 g of hydrogen-type ZSM-5 molecular sieve with a silicon-alumina ratio of 25 was immersed in Fe(NO) in an equal volume. 3 ) 3 solution (wherein, according to Fe 2 O 3 The mass ratio to molecular sieve is 15wt%), impregnated at room temperature for 1 h, and then dried at 110 ° C; the dried catalyst was placed in a muffle furnace for pre-calcination for 2.5 h at a temperature of 390 ° C; Fe / ZSM-5 modified catalyst was obtained. catalyst; Fe / ZSM-5 modified molecular sieve was used with 20ml H concentration of 1mol / L 2 SO 4 The solution was impregnated, treated at room temperature for 30 min, and then dried at 110 °C; the dried catalyst was calcined in a muffle furnace for 20 h at a temperature of 300 °C; molecular sieve supported SO was obtained 4 2- / Fe 2 O 3 acid catalyst. Take 4g of the catalyst prepared above and load it into a stainless steel fixed-bed tubular reactor for catalytic reaction, the ethanol concentration is 50wt%, and the mass space velocity is ...

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Abstract

The invention discloses a method for preparing a molecular sieve super solid acid catalyst used for preparing ethylene by ethanol dehydration, belonging to the technical field of chemical product preparation, wherein the method comprises immersion method and hydro-thermal method, and the molecular sieve solid acid catalyst is prepared with ZSM-5 hydrogen as a carrier by loading Fe3 metallic ion. The invention also provides a technical process that ethanol is dehydrated and converted into ethylene at a low temperature under the action of molecular sieve solid acid catalyst. In the invention, the catalyst used for preparing ethylene by ethanol dehydration can dehydrate the ethanol with different concentrations at a temperature of 220 DEG C to prepare the ethylene, and the conversion rate can reach 98.4%. The catalyst has high activity at a low temperature, thus solving the technical problems of high temperature and low airspeed existed in the present industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical product preparation, and in particular relates to a preparation method of a molecular sieve type solid acid catalyst used for ethanol dehydration to produce ethylene. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. The "triene triphenyl" produced by the ethylene plant and its downstream plants is the basic raw material for the production of various organic chemical products and three major synthetic materials. The development level of the ethylene industry generally represents the level of a country's petrochemical industry. In terms of raw materials, most countries currently use naphtha, ethane, propane and gas oil as raw materials to produce ethylene. However, due to the non-renewable nature of oil, the shortage of oil resources and rising prices have become irreversible, which will directly bring huge impacts and challenge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/76B01J27/02B01J37/02B01J37/10C07C1/24C07C11/04
CPCY02P20/52
Inventor 张建安谢杨程可可刘宏娟周玉杰
Owner TSINGHUA UNIV
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