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Method for preparing acetone through low temperature gas phase dehydrogenation of water-containing isopropanol

A water-containing isopropanol, gas-phase dehydrogenation technology, applied in the field of fine chemicals, can solve the problems such as acetone has not been reported, and achieve the effect of high acetone selectivity, easy separation, and low energy consumption

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Preparation of acetone by low-temperature gas-phase dehydrogenation of aqueous isopropanol has not been reported

Method used

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  • Method for preparing acetone through low temperature gas phase dehydrogenation of water-containing isopropanol

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Experimental program
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Effect test

Embodiment 1

[0021] Carry out continuous dehydrogenation reaction on fixed bed device with catalyst reduction, liquid space velocity 0.4h -1 , under nitrogen flow, the system pressure is ≤0.1MPa, the tail gas flow rate is 50mL / min, the reaction temperature is 180°C, the vaporization temperature is 150°C, the vaporized material is kept at 195-200°C, the reaction product passes through the gas-liquid separator and the condenser, and the tail gas is vented to collect the reaction. liquid. The dehydrogenation solution was analyzed by gas spectrometer internal standard, and the results are shown in Table 1.

Embodiment 2

[0023] Carry out continuous dehydrogenation reaction on the fixed bed device with the catalyst reduced, the liquid space velocity is 0.6h -1 , under nitrogen flow, the system pressure is ≤0.1MPa, the tail gas flow rate is 60mL / min, the reaction temperature is 185°C, the vaporization temperature is 160°C, and the vaporized material is kept at 195-200°C. liquid. The dehydrogenation solution was analyzed by gas spectrometer internal standard, and the results are shown in Table 1.

Embodiment 3

[0025] Carry out continuous dehydrogenation reaction on the fixed bed device with the catalyst reduced, the liquid space velocity is 1.0h -1 , under nitrogen flow, the system pressure is ≤0.1MPa, the tail gas flow rate is 200mL / min, the reaction temperature is 188°C, the vaporization temperature is 170°C, the vaporized material is kept at 195-200°C, the reaction product passes through the gas-liquid separator and the condenser, and the tail gas is vented to collect the reaction liquid. The dehydrogenation solution was analyzed by gas spectrometer internal standard, and the results are shown in Table 1.

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Abstract

The invention relates to a method for preparing acetone through low temperature gas phase dehydrogenation of water-containing isopropanol, and belongs to the technical field of fine chemical industry. According to the present invention, a dehydrogenation raw material is from a production waste solution of an anti-aging agent 4010NA, a waste solution pre-treatment distillation kettle temperature is 80-90 DEG C, a gas phase temperature is 80-82 DEG C, a dehydrogenation raw material distillation rate mass percentage content is 92.86%, a copper-base catalyst is selected, a continuous dehydrogenation reaction is performed on a fixed bed, a liquid space velocity is 0.2-3.0 h<-1>, the system pressure under a nitrogen stream is less than or equal to 0.1 MPa, a tail gas flow rate is 50-400 mL / min, a reaction temperature is 160-220 DEG C, a material vaporization temperature is 150-185 DEG C, and the vaporized material is subjected to thermal insulation at a temperature of 195-220 DEG C; the waste solution can be converted into the raw material acetone for producing the anti-aging agent 4010NA so as to reduce the production consumption of the acetone; and the method has characteristics of low reaction temperature, low energy consumption, easy operation, high acetone selectivity, and easy reaction solution separation, wherein the single pass conversion rate of the isopropanol is more than 50%, and the acetone selectivity is more than 99%.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a process for preparing acetone by low-temperature gas-phase dehydrogenation of water-containing isopropanol. In particular, the water-containing isopropanol mixed liquid not containing 4010NA is pretreated from the production waste liquid of anti-aging agent 4010NA, and the mixed liquid is used as a dehydrogenation raw material to dehydrogenate acetone. Background technique [0002] In the production of anti-aging agent 4010NA, acetone is hydrogenated to generate isopropanol. After the device recovers acetone, the remaining water-containing isopropanol solution has a mass content of 70% to 80% of isopropanol and 20% to 30% of water. It also contains A small amount of anti-aging agent 4010NA, the mass content is generally <3%. Isopropanol and water form a binary azeotrope. The azeotropic composition is 87.4% (wt) isopropanol, 12.6% (wt) water, and the azeotropic point is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/00
CPCC07C45/002C07C49/08
Inventor 陶建青黄伟李秀清刘伊文任磊平俊彦
Owner CHINA PETROLEUM & CHEM CORP
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