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Preparation method of sec-butyl alcohol

A technology of sec-butanol and sec-butyl acetate, which is applied in the preparation of organic compounds, chemical instruments and methods, and the preparation of hydroxyl compounds, can solve the problems of high energy consumption, only about 6%, and achieve simple separation and low energy consumption. The effect of reducing consumption and shortening the process flow

Inactive Publication Date: 2013-06-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of process is currently the mainstream method for the production of sec-butanol. It is necessary to pass the mixed C4 fraction through a gas separation device to obtain a high-concentration n-butene raw material, and then react with water under the action of an acidic catalyst to prepare sec-butanol and n-butene. The single-pass conversion rate is generally only about 6%, and a large amount of n-butene is recycled, and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 10 g of a solid catalyst with an active component of 5% copper oxide (self-made, 5% copper oxide loaded on a columnar alumina carrier prepared by roasting at 540 °C by equal volume impregnation method) was packed in a volume of 40 ml with an inner diameter of In a 10mm stainless steel fixed bed reactor, the top and bottom of the catalyst bed are filled with inert quartz sand; the reaction temperature is heated by an electric furnace outside the reactor, and the temperature is measured by an armored thermocouple placed in the catalyst bed of the reactor, and the reaction temperature is controlled at 200 ℃; The reaction raw material sec-butyl acetate is metered by the metering pump, and pumped into the reactor at a rate of 5g per hour, that is, the reaction mass space velocity is 0.5h -1 ;According to the feed molar ratio of hydrogen and sec-butyl acetate is 4:1, the reaction raw material hydrogen is mixed with the raw material sec-butyl acetate and enters the reactor afte...

Embodiment 2

[0024] 10 g of solid catalyst (preparation method is the same as in Example 1) with a copper oxide content of 10% is packed in the reactor in Example 1, and the reaction temperature is controlled at 220° C.; Pump into the reactor, that is, the reaction mass space velocity is 0.1h -1 ; According to the feed molar ratio of hydrogen and sec-butyl acetate is 8:1; Reaction pressure is 4.0MPa; Reaction is 8 hours, collects sample every hour and is formed by gas chromatography analysis product, and calculates the conversion ratio of sec-butyl acetate and the reaction to Selectivity of sec-butanol. The test results are: the conversion rate of sec-butyl acetate is 98%, the selectivity to sec-butanol is 97%, the selectivity to by-product isobutanol is 3%, and the rest is ethanol.

Embodiment 3

[0026] 10 g of the active component copper oxide content of 15% solid catalyst (preparation method is the same as in Example 1) is packed in the reactor in Example 1, and the reaction temperature is controlled at 240 ° C; Pump into the reactor, that is, the reaction mass space velocity is 1.5h -1 ; According to the feed molar ratio of hydrogen and sec-butyl acetate is 8:1; Reaction pressure is 6.0MPa; Reaction is 8 hours, collects the sample every hour and is formed by gas chromatography analysis product, and calculates the conversion ratio of sec-butyl acetate and to Selectivity of sec-butanol. The test results are: the conversion rate of sec-butyl acetate is 96%, the selectivity to sec-butanol is 99%, the selectivity to by-product isobutanol is 1%, and the rest is ethanol.

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Abstract

The invention relates to a preparation method of sec-butyl alcohol. According to the preparation method, sec-butyl acetate generated through reaction between mixed C4 fractions and acetic acid is used as a raw material and is directly hydrogenated under the action of a copper-based solid catalyst to prepare sec-butyl alcohol with coproduct being ethanol, and in a fixed bed reactor the feed mass space velocity of sec-butyl acetate is 0.1-2.0h<-1>, the molar ratio of hydrogen to sec-butyl acetate is (2-40):1, the reaction temperature is 200-280 DEG C and the reaction pressure is 2.0-9.0MPa to directly prepare sec-butyl alcohol and cogenerate ethanol. The detailed preparation method refers to the specification. The conversion per pass of sec-butyl acetate is over 95%, the selectivity of sec-butyl alcohol is over 95% and ethanol is coproduced. The preparation method has the advantages that the energy consumption is reduced; circulation of mass raw materials is not needed, so the process flow is shortened; no other wastes are generated, so the process is clean; and separation is simple.

Description

technical field [0001] The present invention relates to a kind of preparation method of lower organic alcohol, specifically, the present invention relates to a kind of preparation method of sec-butanol, promptly use the sec-butyl acetate formed by the reaction of mixed C4 fraction and acetic acid as raw material, hydrogenation prepares sec-butyl Alcohol (2-butanol) and co-production of ethanol method. Background technique [0002] Second-butanol is mainly used as a solvent and a raw material for the production of methyl ethyl ketone. The preparation methods of sec-butanol include indirect hydration method and direct hydration method. [0003] The indirect hydration method is to esterify n-butene with sulfuric acid, and then hydrolyze the sulfuric acid ester with steam to obtain sec-butanol. Due to the use of sulfuric acid in this method, there are not only device corrosion, waste sulfuric acid treatment, many side reactions, complicated process flow, but also high energy c...

Claims

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Application Information

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IPC IPC(8): C07C29/149C07C31/12C07C31/08
Inventor 姚志龙王若愚孙培永高俊斌尹振晏
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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