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Method for preparation of ethylene by ethanol dehydration

An ethanol dehydration and ethylene technology, which is applied in the production of bulk chemicals, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve problems such as temperature reduction, catalyst activity reduction, and impact on lower catalyst performance.

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned catalysts show high catalytic activity and selectivity when using high-concentration ethanol as a raw material, but when using low-concentration ethanol as a raw material, the catalyst activity decreases significantly, and the stability is not good
[0007] The dehydration of ethanol to ethylene is an endothermic reaction. The main reaction is the catalytic reaction of one molecule of ethanol to obtain one molecule of ethylene and one molecule of water. The content of the catalyst gradually increases, and there will also be a large temperature difference between the catalyst beds. The catalyst in the lower bed is always in contact with the low-concentration ethanol raw material containing a large amount of water, and the temperature of the lower bed of the catalyst is obviously reduced, which will directly affect the lower catalyst. The performance of the catalyst, resulting in a significant reduction in the activity of the catalyst in the lower part of the reactor, thus affecting the activity, selectivity and stability of the overall catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1. Catalyst preparation:

[0068] Catalyst A preparation

[0069] (1) Preparation of carrier:

[0070] Weigh 145.8g cetyltrimethylammonium bromide and 205g citric acid to make a mixed solution, add 302mL tetraethyl orthosilicate to the mixed solution, stir for 2h, then stir at 70°C until gelation , the gel was aged at 40°C for 12h, then dried at 110°C for 8h, made into a spherical shape with a particle size of 0.2mm, then dried at 110°C for 8h, and calcined at 580°C for 3h to obtain a silica carrier, in which sixteen The molar ratio of alkyltrimethylammonium bromide to silicon oxide is 0.3, and the molar ratio of citric acid to silicon oxide is 0.8. The nature of the carrier is: the specific surface area is 525m 2 / g, the pore volume is 0.64mL / g, and the average pore diameter is 4.9nm.

[0071] (2) Preparation of catalyst:

[0072] Dissolve 27.2g of nickel nitrate in deionized water, add it to 81g of silica carrier, stir at 70°C until the solution is evaporated to ...

Embodiment 2

[0081] Catalyst A and B packing volume ratio are 1:1 among the selection embodiment 1, mass space velocity 4h -1 , the reaction temperature was 250°C, and other evaluation conditions remained unchanged. The results of ethanol conversion and ethylene selectivity are shown in Table 1.

Embodiment 3

[0083] Preparation of Catalyst A:

[0084] (1) Preparation of carrier:

[0085] Weigh 200g of cetyltrimethylammonium bromide and 105.7g of citric acid to form a mixed solution, add 250mL tetraethyl orthosilicate into the mixed solution, stir for 2 hours, and then stir at 70°C until gelation , the gel was aged at 40°C for 12h, then dried at 110°C for 8h to make a spherical particle with a diameter of 0.2mm, then dried at 110°C for 8h, and calcined at 600°C for 3h to obtain a silica carrier, in which sixteen The molar ratio of alkyltrimethylammonium bromide to silicon oxide is 0.5, and the molar ratio of citric acid to silicon oxide is 0.5. The nature of the carrier is: the specific surface area is 570m 2 / g, the pore volume is 0.72mL / g, and the average pore diameter is 5.1nm.

[0086] (2) Preparation of catalyst:

[0087] Dissolve 35.0g of nickel nitrate in deionized water, add it to 73g of silica carrier, stir at 70°C until the solution is evaporated to dryness, dry the ob...

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Abstract

The invention discloses a method for preparation of ethylene by ethanol dehydration. The method involves at least two catalyst beds, i.e. a catalyst A and a catalyst B. The catalyst A is composed of: an active component heteropoly acid ammonium salt, an assistant nickel oxide, and a carrier silicon oxide, and the catalyst B consists of: an active component heteropoly acid ammonium salt, an assistant boron oxide, and a carrier amorphous silica-alumina coated molecular sieve. According to the invention, the two catalysts are employed for mutual cooperation to give full play to respective advantages, so that the reaction system has improved comprehensive reaction performance, and has higher activity, selectivity and stability.

Description

technical field [0001] The invention relates to a method for producing ethylene by ethanol dehydration, in particular to a method for using a combined catalyst for ethanol dehydration to produce ethylene. Background technique [0002] Ethylene is a basic organic chemical raw material and a leading product in the petrochemical industry. About 75% of chemical products are prepared from ethylene. Therefore, ethylene production has become an important indicator to measure the development level of a country's petrochemical industry. Traditional ethylene is mainly produced through the distillation and cracking of light petroleum, which relies heavily on petroleum resources. With the increasingly tense international energy situation and the depletion of oil resources, it is imperative to develop new renewable alternative energy sources. [0003] Recently, the dehydration of ethanol, especially renewable bioethanol, to ethylene has attracted more and more attention. It has many adv...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C1/24B01J31/28B01J31/18B01J31/16
CPCY02P20/52
Inventor 金浩孙素华朱慧红刘杰杨光蒋立敬
Owner CHINA PETROLEUM & CHEM CORP
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