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Ethanol dehydration technique adopting molecular sieve catalyst

An ethanol dehydration and molecular sieve technology, applied in the chemical industry, can solve the problems of not meeting the requirements of the processing technology, low ethylene purity, and high reaction temperature, and achieve the effects of avoiding scale formation, low freezing point, and low reaction temperature.

Inactive Publication Date: 2008-07-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two key problems in the preparation of ethylene from ethanol dehydration: 1) the research on high-efficiency catalysts for ethanol dehydration; the most widely used catalyst is modified alumina catalyst, which has long service life and stable activity, but the catalyst requires The reaction temperature is high (higher than 350°C), the conversion rate of ethanol is generally 95% and the yield of ethylene is only about 90% of the theoretical yield (the yield of a domestic factory is 89%)
[0015] The low-temperature rectification technology is used in the current ethanol dehydration process. This system is an essential process to improve the purity of ethylene. This is because the purity of ethylene produced by traditional catalysts is low and cannot meet the requirements of subsequent processing processes.

Method used

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  • Ethanol dehydration technique adopting molecular sieve catalyst
  • Ethanol dehydration technique adopting molecular sieve catalyst
  • Ethanol dehydration technique adopting molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 1% lanthanum modified catalyst and optimized process conditions

[0043] Catalyst formula: Si-Al ratio 100 molecular sieve raw powder 60g, silica sol 30ml, ammonium dihydrogen phosphate 2.4g, phosphoric acid 24g, sodium carboxymethyl cellulose 1.8g, lanthanum (1%) soaked, potassium hydroxide solution 12ml, molding catalyst.

[0044] HZSM-5 molecular sieve with a Si / Al ratio of 100 is used as the original powder, the binder is sodium carboxymethyl cellulose and water, phosphoric acid is added, and after molding, it is formed in 1%wt La 3+ Soak in the solution, stir at 60°C for 2h, dry at 80°C for 15h, and calcinate at 550°C for 6h in a muffle furnace to obtain a catalyst with a La content of 1 wt%.

[0045] The shaped catalyst was loaded as shown in Figure 1, and the traditional process Figure 2 and the improved process Figure 3 were respectively inspected, and the results are shown in Table 3.

[0046] By comparison, we found that when one reactor is used fo...

Embodiment 2

[0047] Example 2 3% cobalt modified catalyst and optimized process conditions

[0048] Catalyst formula: 60g of molecular sieve powder with a silicon-aluminum ratio of 100, 30ml of silica sol, 2.4g of ammonium dihydrogen phosphate, 24g of phosphoric acid, 1.8g of sodium carboxymethylcellulose, impregnated with cobalt (3%), impregnated with 12ml of potassium hydroxide solution, and formed catalyst.

[0049] HZSM-5 molecular sieve with a Si / Al ratio of 100 is used as the original powder, the binder is sodium carboxymethyl cellulose and water, phosphoric acid is added, and after molding, the Co 2+ After soaking in the solution, stirring at 60°C for 2h, drying at 80°C for 15h, and calcination at 550°C in a muffle furnace for 6h, a catalyst with a cobalt content of 3wt% was obtained.

[0050] The shaped catalyst was loaded as shown in Figure 1, and the traditional process Figure 2 and the improved process Figure 3 were respectively inspected, and the results are shown in Table 1. ...

Embodiment 3

[0052] Embodiment 3 8% lanthanum modified catalyst and optimized process conditions

[0053] Catalyst formula: 60g of molecular sieve raw powder with a silicon-aluminum ratio of 100, 30ml of silica sol, 2.4g of ammonium dihydrogen phosphate, 24g of phosphoric acid, 1.8g of sodium carboxymethylcellulose, soaked in lanthanum (8%), soaked in 12ml of potassium hydroxide, and formed the catalyst .

[0054] HZSM-5 molecular sieve with a Si / Al ratio of 100 is used as the original powder, the binder is sodium carboxymethylcellulose and water, phosphoric acid is added, and after molding, it is formed in 8%wt La 3+ Soak in the solution, stir at 60°C for 2h, then soak in 0.01mol / L potassium hydroxide solution, stir at 60°C for 2h, dry at 80°C for 15h, and roast at 550°C for 6h in a muffle furnace to obtain a La content of 8wt%. the catalyst.

[0055] The shaped catalyst was loaded as shown in Figure 1, and the traditional process Figure 2 and the improved process Figure 3 were respecti...

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Abstract

The invention discloses a high-efficiency ethanol dehydration process by using a molecular sieve catalyst; ethanol is taken as raw material and the modified molecular sieve as the catalyst to prepare ethylene through dehydration reaction; the invention comprises the specific steps that two or above two multitubular packed-bed reactors are serially connected and the catalyst is put into the reactors; the ethanol which passes through the reactor in a liquid hourly space velocity of 0.4 to 4.5 h <MINUS 1> is converted to the ethylene under a temperature ranging from 150 DEG C to 400 DEG C. The invention can effectively improve yield of the ethylene and conversion rate of the raw material; the invention has the advantages of energy saving, flexible reaction condition, high application efficiency of the catalyst, high reaction activity, long service life, high strength, low reaction temperature and great industrialization application value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing ethylene by dehydrating ethanol in a tubular fixed-bed reactor by using a modified molecular sieve catalyst. Background technique [0002] Ethylene is an important basic organic chemical raw material. The scale and level of the ethylene industry is an important symbol of the development level of a country's chemical industry. As an important chemical raw material, ethylene has important applications in many aspects. In industry, it is mainly used to synthesize the following substances: polyethylene, ethylbenzene, ethylene oxide, dichloroethane, oligomers, etc. In addition, ethylene also has important applications in medicine and agriculture. With the continuous development of my country's economy, my country has become a country with a large demand for energy and resources. In particular, the demand for ethylene in my country is growi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J29/42
CPCY02P20/52
Inventor 黄和苏国东李慧曾必文胡耀池胡燚索红波
Owner NANJING UNIV OF TECH
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