Process method for preparing ethyl tert-butyl ether

A technology of ethyl tertiary butyl ether and process method, which is applied in the directions of adding unsaturated compounds to prepare ether, ether preparation, chemical instruments and methods, etc., can solve the problems of reduced activity, loss of dissolution, poor stability, etc. High, easy to operate, good stability

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage at present is the low activity
[0016] The heteropolyacid catalyst itself has low activity and poor stability, which limits its application
The lack of stability of heteropolyacid catalysts is mainly manifested in poor thermal stability, water solubility and alcohol solubility.
The thermal stability of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] In the preparation process of the above-mentioned titanium-based composite oxide, the reaction time is 3h-24h, preferably 5h-20h, and most preferably 6h-12h. The drying temperature is 100°C to 180°C, preferably 100°C to 160°C, and most preferably 100°C to 120°C. The drying time is 8h-24h, preferably 6h-16h, most preferably 8h-12h. The calcination temperature is 400°C to 600°C, preferably 400°C to 550°C, and most preferably 400°C to 500°C. The roasting time is 8h-24h, preferably 8h-20h, most preferably 8h-16h.

[0027] The formed titanium-based composite oxide support is impregnated in a heteropolyacid solution according to a conventional impregnation method. The immersion time is 6h-24h, preferably 6h-16h, most preferably 8h-12h. The impregnated product is dried at 100°C~160°C for 6h~12h, preferably at 100°C~140°C for 6h~10h, most preferably at 100°C~120°C for 8h~10h. The impregnated product is roasted at 350℃~650℃ for 8h~24h, preferably at 400℃~550℃ for 8h~16h, mos...

Embodiment 1

[0030] A certain amount of aluminum nitrate and a certain amount of titanium tetrachloride are prepared into aqueous solution a, potassium hydroxide alkaline solution b is prepared, and solution b is added dropwise to a under normal temperature and stirring, and the reaction is 10h to obtain a white paste After washing, filtering, drying at 120°C for 10h, extruding into strips according to conventional methods, and then calcining at 500°C for 8h to obtain a titanium-based composite oxide carrier.

[0031] A certain amount of phosphomolybdic acid was dissolved in deionized water, and the above shaped and calcined catalyst carrier was immersed in the heteropoly solution for 8 hours. The catalyst was obtained, and the physical properties of the catalyst are shown in Table 1.

[0032] The etherification of isobutene and ethanol was carried out in a stainless steel fixed-bed reactor of Φ18mm×1200mm, and 30ml of the above-mentioned catalyst was loaded into the reactor. The top and b...

Embodiment 2

[0034] Other conditions are the same as in Example 1, except that the consumption of aluminum nitrate and phosphomolybdic acid is changed, the catalyst composition is shown in Table 1, and the reaction result is shown in Table 2.

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PUM

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Abstract

The invention provides a process method for preparing ethyl tert-butyl ether. The process method comprises the following steps of: taking isobutene and ethanol as raw materials, and using a heteropoly acid/titanium-based complex oxide catalyst to prepare the ethyl tert-butyl ether, wherein the heteropoly acid/titanium-based complex oxide catalyst takes a complex oxide as a carrier and takes heteropoly acid as an active component, the complex oxide is one or more of titanium-based complex oxides in TiO2-SiO2 or TiO2-ZrO2, and the heteropoly acid is one or more of phosphotungstic acid, silicotungstic acid, arsenotungstic acid, germanotungtic acid, phosphomolybdic acid, silicomolybdic acid, arsenomolybdic acid and germanomolybdic acid. According to the process method provided by the invention, the catalyst adopting the titanium-based complex oxide to load the heteropoly acid is adopted, so that the shortcomings of inactivation of the catalyst and reduced conversion rate, which are caused by easiness in damaging the Keggin structure of the heteropoly acid of the loaded heteropoly acid catalyst, easiness in loss of acid amount and difficulty in separation, can be overcome.

Description

technical field [0001] The invention provides a method suitable for preparing ethyl tertiary butyl ether (ETBE) by the etherification reaction of hydrocarbon and alcohol. technical background [0002] As gasoline additives, ethyl tertiary butyl ether (ETBE) and methyl tertiary butyl ether (MTBE) have a good blending effect, good chemical stability, can be miscible with hydrocarbon fuels in any proportion, and have excellent shock resistance performance. And the addition of ETBE and MTBE can reduce the emission of harmful gases such as CO and reduce atmospheric pollution. Compared with MTBE, ETBE has a higher octane number and lower vapor pressure, so gasoline added with ETBE can meet the requirements for use in hot and dry regions. At the same time, since the leakage of MTBE will bring certain water pollution problems, there is a tendency to limit its use. As one of the alternatives to MTBE, ETBE has begun to receive attention. [0003] The production process of ETBE is ...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/06B01J31/38
Inventor 霍稳周乔凯吕清林刘野李花伊田丹魏晓霞
Owner CHINA PETROLEUM & CHEM CORP
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