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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: 2015-02-18
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 heteropoly acid is not good, and it will slowly decompose at higher temperature, resulting in the loss of active components, and then the activity decreases; the alcohol solubility of heteropoly acid, in the reaction system containing alcohol, heteropoly acid will be dissolved and lost , thereby reducing the activity 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, most preferably 6h-12h. The drying temperature is from 100°C to 180°C, preferably from 100°C to 160°C, most preferably from 100°C to 120°C. The drying time is 8h-24h, preferably 6h-16h, most preferably 8h-12h. The calcination temperature is 400°C-600°C, preferably 400°C-550°C, most preferably 400°C-500°C. The calcination 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 impregnation is dried at 100°C to 160°C for 6h to 12h, preferably at 100°C to 140°C for 6h to 10h, most preferably at 100°C to 120°C for 8h to 10h. The impregnated material is roasted at 350°C-650°C for 8h-24h, preferably at 400°C-550°C fo...

Embodiment 1

[0030] Prepare a certain amount of aluminum nitrate and a certain amount of titanium tetrachloride to prepare aqueous solution a, prepare potassium hydroxide alkaline solution b, add solution b dropwise to a under normal temperature and stirring state, and react for 10 hours to obtain a white paste After washing, filtering, and drying at 120°C for 10h, extruding according to the conventional method, and then calcining at 500°C for 8h to obtain a titanium-based composite oxide carrier.

[0031] Dissolve a certain amount of phosphomolybdic acid in deionized water, immerse the above-mentioned shaped and roasted catalyst carrier in the heteropoly solution for 8 hours, dry the impregnated material at 120°C for 10h, and roast at 450°C for 10h to prepare Obtain the catalyst, and the physical properties of the catalyst are shown in Table 1.

[0032] The etherification of isobutene and ethanol is carried out in a Φ18mm×1200mm stainless steel fixed-bed reactor, and 30ml of the above-men...

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 results are 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 tert-butyl ether (ETBE) through the etherification reaction of hydrocarbon and alcohol. technical background [0002] As gasoline additives, ethyl tert-butyl ether (ETBE) and methyl tert-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. Moreover, the addition of ETBE and MTBE can reduce the emission of harmful gases such as CO and air pollution. Compared with MTBE, ETBE has a higher octane number and a lower vapor pressure. Therefore, gasoline added with ETBE can meet the requirements for use in hot and dry areas. At the same time, because the leakage of MTBE will cause certain water pollution problems, there is a tendency to limit its use. As one of the substitutes of MTBE, ETBE began to receive people's attention. [0003] The production process of ETBE is si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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