Method for preparing ethylene through ethanol dehydration

A technology for ethanol dehydration and ethylene, applied in chemical instruments and methods, catalyst activation/preparation, hydrocarbon production from oxygen-containing organic compounds, etc., can solve problems such as poor reaction stability

Inactive Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there is a problem of poor reaction stability in the prior art, and a new method for preparing ethylene by dehydration of ethanol is provided

Method used

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  • Method for preparing ethylene through ethanol dehydration
  • Method for preparing ethylene through ethanol dehydration
  • Method for preparing ethylene through ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 40% silica sol, sodium metaaluminate, tetrabutylammonium bromide, sodium chloride, sodium hydroxide and water, stir for 20 minutes, put into a reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, and washed with water until the pH value was 8, and dried at 120°C for 12 hours to obtain the original powder of ZSM-11 molecular sieve. The XRD spectrum is shown in figure 1 , SEM photo see figure 2 , the grain diameter is 0.5 microns. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =149.3,H 2 O / SiO 2 =32.8, NaCl / SiO 2 =0.6, NaOH / SiO 2 = 0.08, TBABr / SiO 2 = 0.12.

[0026] The synthesized ZSM-11 molecular sieve raw powder was treated with 0.3 mol / L nitric acid at 80°C for 4 hours for 3 consecutive times to obtain HZSM-11.

[0027] Mix HZSM-11 with boehmite, Tianqing powder, and 0.3 mol / liter nitric acid, and the weight ratio of each raw material is ZSM-11 / Al 2 o 3 / Tian Qing powd...

Embodiment 2

[0030] Mix 40% silica sol, sodium metaaluminate, tetrabutylammonium bromide, sodium chloride, sodium hydroxide and water, stir for 20 minutes, put into a reaction kettle, and crystallize at 170°C for 1 day. The crystallized product was quenched, filtered, washed with water until the pH value was 8, and dried at 120°C for 12 hours to obtain ZSM-11 molecular sieve raw powder with a grain diameter of 0.5 microns. The molar ratio of each raw material in the reaction mixture is: SiO 2 / Al 2 o 3 =149.3,H 2 O / SiO 2 =32.8, NaCl / SiO 2 =0.6, NaOH / SiO 2 = 0.08, TBABr / SiO 2 = 0.12.

[0031] The synthesized ZSM-11 molecular sieve raw powder was treated with 0.3 mol / L hydrochloric acid at 80°C for 4 hours for 3 consecutive times to obtain HZSM-11.

[0032] Mix HZSM-11 with boehmite, Tianqing powder, and 0.3 mol / liter nitric acid, and the weight ratio of each raw material is HZSM-11 / Al 2 o 3 / Tian Qing powder = 1: 1: 0.1, extruded into strips, dried at 120°C for 12 hours, roasted ...

Embodiment 3

[0035] According to the steps and conditions of [Example 2], only SiO in the synthetic formula 2 / Al 2 o 3 =52, tetrabutylammonium hydroxide was used as template agent, crystallized at 120° C. for 8 days, and the crystal grain diameter of the synthesized ZSM-11 molecular sieve raw powder was 1 micron. Exchange with 1.0 mol / L citric acid at 80°C for 10 hours. A catalyst for ethanol dehydration to ethylene is obtained.

[0036] The performance of the catalyst was evaluated according to the steps of [Example 1]. The reaction conditions and the results are shown in Table 1.

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Abstract

The invention relates to a method for preparing ethylene through ethanol dehydration and mainly solves the problem of poor reaction stability in the prior part. According the method, ethanol with the weight percentage concentration being 5 to 100 percent is used as raw materials, reaction raw materials and catalysts are in contact to generate ethylene under the conditions that the reaction temperature is 200 to 400 DEG C, and the volume space velocity relative to the ethanol is 0.1 to 15 h<-1>, wherein the used catalysts comprise the following ingredients through be metered in parts by weight: a, 40 to 95 parts of ZSM-11 molecular sieves, wherein the silicon aluminum mol ratio (SiO2 / Al2O3) is 200-300, and the crystal grain diameter is smaller than or equal to 5 microns; and b, 5 to 60 parts of bonding agents; and the ZSM-11 molecular sieves are at least subjected to acid washing for once. Through the technical scheme, the problem is perfectly solved, and the method can be used in the industrial production of ethylene preparation through ethanol dehydration.

Description

technical field [0001] The invention relates to a method for preparing ethylene by dehydrating ethanol. Background technique [0002] As a basic organic chemical raw material and a leading product in the petrochemical industry, ethylene is known as the "mother of petrochemical industry". It is mainly used in the production of polyethylene, ethylene oxide / ethylene glycol, dichloroethane, styrene, acetic acid Chemicals such as ethylene. With the rapid development of ethylene derivative industries such as chemical industry, energy and materials, the demand for ethylene is increasing. At present, ethylene mainly comes from naphtha cracking. As petroleum resources are non-renewable and are gradually becoming exhausted, the use of renewable biomass resources to develop bioenergy and biochemical industries has become an inevitable trend of current and future economic development. Ethanol can be obtained by fermentation of plant starch or wood fiber. The source of raw materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J29/40B01J37/00
CPCY02P20/52
Inventor 李亚男徐菁孙兰萍金照生
Owner CHINA PETROLEUM & CHEM CORP
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