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An improved method for directly hydrating low-carbon olefins to generate low-carbon alcohols

A technology of low-carbon olefins and low-carbon alcohols, applied in the direction of hydroxyl addition preparation, etc., can solve the problem of low conversion rate of olefins in one pass, achieve high conversion rate, increase hydration reaction rate, and expand production capacity.

Active Publication Date: 2011-11-30
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low conversion rate of olefins in the process of direct hydration of low-carbon olefins to generate low-carbon alcohols in the prior art, and provide a method for direct hydration of low-carbon olefins with high conversion rate of olefins to generate low-carbon alcohols

Method used

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  • An improved method for directly hydrating low-carbon olefins to generate low-carbon alcohols
  • An improved method for directly hydrating low-carbon olefins to generate low-carbon alcohols

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Embodiment 3

[0027] Using the same experimental device as in Example 1, the same reaction raw materials and the same reaction conditions, after 250 hours of stable operation of the device, 0.5%, 1%, 2%, 3%, and 4% of n-butene mass were added to the reaction water , 5% PEG, and measure the conversion of butene. The results are shown in Table 3.

[0028] table 3

[0029] PEG, % 0 0.5 1 2 3 4 5 Conversion rates,% 6.78 7.83 7.98 8.11 8.27 8.33 8.31

[0030] From the above results of Example 3, it can be seen that different PEG additions have different effects on improving the one-pass conversion of butene. With the increase of PEG addition in the reaction water, the one-pass conversion of butene is also increasing, but when the PEG addition exceeds the olefin 5% by mass, the conversion rate of butene will no longer increase, therefore, the addition of PEG should be controlled at 0.5-5% by mass ...

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Abstract

The invention provides an improved method for producing low-carbon alcohols through the direct hydration of low-carbon olefins. The method is based on the existing process of directly hydrating low-carbon olefins to produce low-carbon alcohols. Ethylene glycol is used as a reaction aid to improve the mass transfer of olefins and water-liquid-liquid heterogeneous phases, so that the hydration reaction of low-carbon olefins can be accelerated without additional equipment, and a higher single-pass conversion can be obtained Rate. It has been determined that under the same process conditions, the addition of polyethylene glycol increases the conversion rate of olefins by 1.5-3.5%. On the premise of not increasing equipment and cost, the production capacity of the device is effectively expanded, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and relates to a method for directly hydrating low-carbon olefins to produce low-carbon alcohols, in particular to an improved method for producing low-carbon alcohols with 3 to 5 carbon atoms by hydrating low-carbon olefins. Background technique [0002] Under the action of cation exchange resin catalyst, low-carbon olefins can generate corresponding low-carbon alcohols through the action of acid catalysis. Since low-carbon olefins are almost immiscible with water, the reaction is carried out under three-phase conditions (solid catalyst phase, liquid phase, water-gas phase, and low-carbon olefin phase). The catalyst used in the reaction is a modified temperature-resistant strong acid ion exchange resin, which is characterized by high reactivity, high space-time yield of the catalyst, low corrosion and light pollution. Due to the different reaction processes and mechanisms when hydrating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/04
Inventor 李家民任万众苏芳云齐世学姚亚平张晓杰张耀亨许文友肖军王桂敏李彬
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP