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A kind of synthesis and regeneration method of catalyst for ethanol to ethylene

A technology for producing ethylene from ethanol and a synthesis method, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of decreased catalyst activity and stability, destroyed molecular sieve lattice, shortened service life, etc. High catalyst activity and selectivity, superior performance, and adjustable silicon-aluminum ratio

Active Publication Date: 2015-09-30
HAO HUA CHENGDU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve its catalytic performance in the reaction of ethanol to ethylene, it is often necessary to carry out surface acid treatment. The modification methods mainly include steam treatment and acid treatment. The patent application number is 201010608182.2, but this will destroy the molecular sieve lattice, thereby forming skeleton defects, which will eventually lead to a decrease in catalyst activity and stability. If it is regenerated frequently, its skeleton structure will also be destroyed and its service life will be shortened.

Method used

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  • A kind of synthesis and regeneration method of catalyst for ethanol to ethylene

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Effect test

Embodiment 1

[0028] Use metal aluminum foil as raw material, add hydrochloric acid with a prepared concentration of 1 mol / L into a three-necked flask, and keep it in a constant temperature water bath at 80 °C for 8 hours to obtain aluminum sol, wherein the aluminum content in the aluminum sol is calculated as alumina. 20wt%. Then, 5 parts of aluminum sol and 95 parts of hydrogen-type Pentasil-type zeolite molecular sieve with a silicon-aluminum molar ratio of 50 were respectively weighed and placed in a three-necked flask, and then treated in a constant temperature water bath at 80 °C for 8 hours, and kept stirring, and then used Wash with ionized water until the pH of the filtrate is 6.5-7.5. Then, it was dried in a blast drying oven at 110°C for 16 hours, and then calcined in a muffle furnace at 550°C for 6 hours to obtain the required catalyst for producing ethylene from ethanol.

Embodiment 2

[0030] Use metal aluminum foil as raw material, add oxalic acid with a prepared concentration of 10 mol / L into a three-necked flask, and then keep it in a constant temperature water bath at 100 ° C for 8 hours to obtain aluminum sol, wherein the aluminum content in the aluminum sol is calculated as alumina. 5wt%. Then, 30 parts of aluminum sol and 70 parts of hydrogen-type Pentasil-type zeolite molecular sieve with a silicon-aluminum molar ratio of 200 were respectively weighed and placed in a three-necked flask. Wash with ionized water until the pH of the filtrate is 6.5-7.5. Then, it was dried in a blast drying oven at 100°C for 24 hours, and then calcined in a muffle furnace at 500°C for 6 hours to obtain the catalyst for ethanol to ethylene.

Embodiment 3

[0032] Take metal aluminum foil as raw material, add acetic acid with a prepared concentration of 8 mol / L into a three-necked flask, and keep it in a constant temperature water bath at 60°C for 12 hours to obtain an aluminum sol, in which the aluminum content in the aluminum sol is calculated as alumina 15wt%. Then, 10 parts of aluminum sol and 90 parts of hydrogen-type Pentasil-type zeolite molecular sieve with a silicon-aluminum molar ratio of 140 were respectively weighed and placed in a three-necked flask. Wash until the pH of the filtrate is 6.5-7.5. It was then dried in a blast drying oven at 120 °C for 2 hours, and then calcined in a muffle furnace at 400 °C for 24 hours. The required ethanol to ethylene catalyst is obtained.

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Abstract

The invention discloses a synthesis method of a catalyst for preparing ethylene from ethanol. The method comprises the following steps: (1) based on parts by mass, firstly taking 5 to 30 parts of alumina sol, wherein the content of the alumina in the alumina sol is from 5wt% to 25wt%, thereby obtaining a slurry A; (2) stirring and slowly adding 70 to 95 parts of hydrogen-type Pentasil-based zeolite molecular sieve powder by mass into the slurry A, wherein the silicon-aluminum molar ratio of the molecular sieve powder is between 25 and 200, thereby obtaining a slurry B; and (3) after heating and modifying the slurry B, washing and drying the slurry B and standing the slurry B in a muffle furnace for roasting, thereby obtaining the catalyst for preparing the ethylene from the ethanol. The invention further discloses a regeneration method of the catalyst. The catalyst synthesized by using the method has the characteristics of high hydrothermal stability, adjustable silicon-aluminum ratio, high dispensability and the like, and also has the advantages of low reaction temperature, high activity and selectivity and the like. In addition, the catalyst can be regenerated for many times. Thus, the catalyst is superior in performance.

Description

technical field [0001] A kind of synthesis and regeneration method of catalyst for ethanol to ethylene technical field [0002] The invention belongs to the field of catalysts, in particular to a method for synthesizing a catalyst for producing ethylene from ethanol and a regeneration method for the catalyst. Background technique [0003] Ethylene is an important petrochemical basic raw material, which can be used to produce a variety of important organic chemical raw materials. However, due to the shortage of oil supply, the rise of crude oil price and the environmental problems caused by the traditional oil route to produce ethylene, the non-traditional oil route to produce ethylene will have a great market prospect. The vigorous development of the bioethanol industry just caters to this need. At the same time, with the maturity of bioethanol technology, the cost of bioethanol continues to decrease, making the process of ethanol production of ethylene more economically ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/90C07C11/04C07C1/24
CPCY02P20/52Y02P20/584
Inventor 谭亚南何霖韩伟
Owner HAO HUA CHENGDU TECH
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