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Temporary stopping method for synthesis technology of methyl isobutyl ketone by acetone

A technology of methyl isobutyl ketone and acetone, which is applied in chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve problems such as low production efficiency, high product cost, broken catalysts, etc., and achieve energy saving consumption, high conversion rate, and reduced impact

Active Publication Date: 2018-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-step production process is long, complicated, low production efficiency and high product cost
If the work is started again, the catalyst will expand immediately after being wetted by the raw material acetone, causing some catalysts to be broken, which in turn will cause the loss of the catalyst

Method used

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  • Temporary stopping method for synthesis technology of methyl isobutyl ketone by acetone
  • Temporary stopping method for synthesis technology of methyl isobutyl ketone by acetone
  • Temporary stopping method for synthesis technology of methyl isobutyl ketone by acetone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The experimental device, experimental reaction conditions and results are the same as those of Comparative Example 1.

[0065] The steps for shutting down the device are as follows:

[0066] (1) After the device starts to shut down, start to introduce acetone with a water content of 0.5wt% into the reactor. According to previous experimental data, when the water content of acetone is 0.5 wt%, the conversion rate of the reaction drops from the normal 34.0% to 26.0%, so the heat of reaction released is also reduced by nearly a quarter. Therefore, the cooling rate at this time can reach 8.0-10.0°C / h, so the time required for the device to drop from the normal temperature to 110°C is 0.3-0.7 hours.

[0067] (2) After the catalyst bed temperature drops to 110°C, when the water content of the acetone feed is increased to 1.0wt%, it can be seen from the previous experimental data that the conversion rate of the reaction at this time drops to 21.0%, and the corresponding cooli...

Embodiment 2

[0073] The experimental device, experimental reaction conditions and results are the same as those of Comparative Example 2.

[0074] The steps for shutting down the device are as follows:

[0075] (1) After the device starts to shut down, start to introduce acetone with a water content of 0.5wt% into the reactor. According to previous experimental data, when the water content of acetone is 0.5 wt%, the conversion rate of the reaction drops from the normal 34.0% to 26.0%, so the heat of reaction released is also reduced by nearly a quarter. Therefore, the cooling rate at this time can reach 8.0-10.0°C / h, so the time required for the device to drop from the normal temperature to 105°C is 2.0-3.2 hours.

[0076] (2) After the temperature of the catalyst bed dropped to 105°C, the water content of the acetone-containing feed was increased to 1.0wt%. According to the previous experimental data, the conversion rate of the reaction at this time dropped to 21.0%, and the correspondin...

Embodiment 3

[0081] The experimental device, experimental reaction conditions and results are the same as those of Comparative Example 2.

[0082] The steps for shutting down the device are as follows:

[0083](1) After the device starts to shut down, start to introduce acetone with a water content of 0.5wt% into the reactor. According to previous experimental data, when the water content of acetone is 0.5 wt%, the conversion rate of the reaction drops from the normal 34.0% to 26.0%, so the heat of reaction released is also reduced by nearly a quarter. Therefore, the cooling rate at this time can reach 8.0-10.0°C / h, so the time required for the device to drop from the normal temperature to 110°C is 1.5-2.5 hours.

[0084] (2) After the temperature of the catalyst bed dropped to 110°C, the water content of the acetone-containing feed was increased to 1.0wt%. According to the previous experimental data, the conversion rate of the reaction at this time dropped to 21.0%, and the corresponding...

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Abstract

The invention discloses a stopping method for synthesis technology of methyl isobutyl ketone by acetone through a one step method. The method comprises the following steps: 1) an apparatus uses a precious metal resin catalyst; after stopping, a water content of acetone is increased to greater than 0.3 wt%-0.5wt%; 2) the temperature of a catalyst bed layer is reduced to 105+ / -5 DEG C, the water content of acetone is increased to greater than 0.5 wt%-1.0wt%; 3) the temperature is continuously reduced, when the temperature of the catalyst bed layer is reduced to 5-30 DEG C, the water content of acetone is increased to greater than 0.5 wt%-20wt%; 4) optionally, the step 3) is repeated for 0-4 times; 5) when the temperature of the catalyst bed layer is reduced to 85+ / -5 DEG C, the water contentof acetone is kept, or routine acetone charging is switched; and 6) the temperature of the catalyst bed layer is continuously reduced to 40-60 DEG C, feeding stops, and working is finished. The method can realize rapid cooling and stopping of the apparatus, and reduces the influence of the current stopping method for a subsequent separating system.

Description

technical field [0001] The invention relates to a production technology for synthesizing methyl isobutyl ketone from acetone, in particular to a temporary or short-term shutdown method for the process of synthesizing methyl isobutyl ketone from acetone. Background technique [0002] Methyl isobutyl ketone (MIBK for short) is a medium-boiling solvent with a wide range of uses, mainly used as a solvent for nitrocellulose and epoxy resin. In addition, MIBK is also the main raw material for some organic synthesis, such as for the production of methyl isobutyl alcohol, rubber antioxidant 4020 and many other downstream products. [0003] The production method of MIBK is generally divided into three-step method and one-step method. The three-step method has long production process, complex process, low production efficiency and high product cost. The one-step method allows the three reactions in the three-step method to be completed in one step on the Pd / resin catalyst. Compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/73C07C49/04
CPCC07C45/73C07C49/04
Inventor 祁文博艾抚宾徐彤袁毅乔凯
Owner CHINA PETROLEUM & CHEM CORP
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