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Small-grain ZSM-5 molecular sieve catalyst used for preparing ethylene from bioethanol and preparation method thereof

A technology of ZSM-5 and bioethanol, which is applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as low conversion rate and selectivity, and short service life of ZSM-5 molecular sieves, and achieve Low catalytic temperature, easy control of synthesis conditions, high selectivity and conversion

Active Publication Date: 2012-06-27
GUANGXI RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of ZSM-5 molecular sieve catalyst that is used in bioethanol dehydration to ethylene reaction with high reactivity, simple process and low cost, which solves the problem of short service life of ZSM-5 molecular sieve in the prior art, low conversion rate and The problem of low selectivity

Method used

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  • Small-grain ZSM-5 molecular sieve catalyst used for preparing ethylene from bioethanol and preparation method thereof
  • Small-grain ZSM-5 molecular sieve catalyst used for preparing ethylene from bioethanol and preparation method thereof
  • Small-grain ZSM-5 molecular sieve catalyst used for preparing ethylene from bioethanol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Synthesis of crude product of ZSM-5 molecular sieve

[0028] First methanol, 23 grams of ethylamine and aniline, 5 grams, and 0.9 grams were mixed evenly, and then 345 grams of water glass (containing 8.16% (w / w) Na 2 O, 28.10% (w / w) SiO 2] and 600 grams of water were made into solution A; 18 grams of aluminum sulfate (98%, containing 18 water, w / w) were dissolved in 29.8 methanesulfonic acid and 400 grams of water to obtain liquid B; Liquid is added to liquid A to prepare a uniform gel-like colloidal liquid. At this point the composition of the reaction mixture is: SiO 2 / Al 2 o 3 =60; organic template / Al 2 o 3 = 15.96; Na 2 O / Al 2 o 3 =5.59;H 2 O / Al 2 o 3 =2600.

[0029] The colloid obtained above was put into a 2-liter synthesis kettle, first crystallized at 35°C for 2 hours, then slowly stirred and crystallized at 80°C for 40 hours, and finally stirred and crystallized at 220°C for 2 hours. At this time, a pure ZSM-5 molecular sieve with very small ...

Embodiment 2

[0038] 1. Synthesis of crude product of ZSM-5 molecular sieve

[0039] First mix 20 grams, 38 grams and 3.5 grams of ethanol, methylamine and p-methylaniline evenly, then add 691 grams of sodium silicate [containing 21.16% (w / w) Na 2 O, 20.90% (w / w) SiO 2 ) and 800 grams of water are made into solution A; 4 grams of sodium aluminate (Al 2 o 3 , 48%, w / w) was dissolved in 65.1 grams of ethanesulfonic acid and 200 grams of water to obtain liquid B; under vigorous stirring, liquid B was added to liquid A to prepare a uniform colloidal colloidal liquid. At this point the composition of the reaction mixture is SiO 2 / Al 2 o 3 =126; organic template / Al 2 o 3 =81; Na 2 O / Al 2 o 3 =18;H 2 O / Al 2 o 3 =3490

[0040] Put the above colloid into a 2-liter synthesis kettle, first crystallize at 25°C for 8 hours, then slowly stir and crystallize at 110°C for 16 hours, and finally stir and crystallize at 160°C for 8 hours. At this time, a pure ZSM-5 molecular sieve with very sm...

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Abstract

The invention discloses a small-grain ZSM-5 molecular sieve catalyst used for preparing ethylene from bioethanol. The weight ratio of silicone of the ZSM-5 molecular sieve to aluminum of the ZSM-5 molecular sieve is 10 to 200 and the grain diameter is 60 to 100nm. A preparation method for the molecular sieve comprises the following steps of: preparing a ternary organic template agent from alkyl alcohol, alkylamine and aromatic amine; dissolving the silicon source in the ternary organic template agent and water to prepare solution A; dissolving the aluminum source in organic acid and water to obtain solution B; adding the solution B into the solution A with serious stirring to prepare a colloidal solution; putting the colloidal solution into a synthesis kettle to react and crystallize; cooling the reaction product to the room temperature; washing the synthetic product with the water and drying the product to obtain the small-grain ZSM-5 molecular sieve; alternately processing the product for several times with ammonium chloride; and drying the product to obtain the small-grain ZSM-5 molecular sieve catalyst. The catalyst has the advantages of easy control of the synthesis condition, simple preparation, low crystallization temperature and short time and has the characteristics of low concentration for ethanol, low crystallization temperature, high selectivity and high conversionof producing ethylene by ethanol dehydration, high feeding air speed and the like when used in catalytic reaction of preparing the ethylene by dehydration of the bioethanol.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a catalyst for dehydrating ethylene from bioethanol and a preparation method thereof. Background technique [0002] Before the 1940s, almost all the ethylene in the world was produced by dehydration of ethanol. Later, due to the development of petrochemical industry, a large amount of cheap petroleum promoted the cracking of hydrocarbons to produce ethylene, which replaced the ethylene produced by ethanol dehydration with its economic advantages. , the method of ethanol catalytic dehydration to ethylene is gradually eliminated. In the 1970s, with the sustained and rapid development of the social economy, the demand for ethylene was increasing day by day, but the most basic raw material of the ethylene industry was gradually exhausted. In recent years, the dehydration of ethanol to ethylene has been paid more and more attention. Ethylene, which was developed on the basis of che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J37/30C07C11/04C07C1/24
CPCY02P20/52
Inventor 韦志明张守利覃兰华黄科润黄科林莫炳荣黄平
Owner GUANGXI RES INST OF CHEM IND CO LTD
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