Reactor starting method for synthesizing methyl isobutyl ketone from acetone by one-step process

A kind of technology of methyl isobutyl ketone and start-up method is applied in the field of reactor start-up for synthesizing methyl isobutyl ketone by acetone one-step method, can solve problems such as time-consuming and labor-intensive, and achieve the effects of avoiding excessive temperature and easy operation.

Active Publication Date: 2020-06-02
ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, the above scheme needs to change the water content of the acetone feed, and needs to be repeated several times, which is time-consuming and laborious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Start-up process using new catalyst

[0028] (1) Activation of the catalyst: the catalyst is filled in the tube side of the reactor, and the flow rate in the shell side of the reactor is 30m 3 / h coolant; inject process water with a flow rate of 400L / h into the tube side of the reactor to wet the catalyst, so that the liquid level in the tube side of the reactor reaches 50% and maintain it; then slowly inject hydrogen into the reaction Raise the pressure of the reaction system to 3.1MPa and maintain it in the tube side of the reactor, then raise the temperature of the coolant to 80°C at a rate of 8°C / h through steam, and activate the catalyst with hydrogen for 24 hours. After the activation is complete, stop the steam heating and put The coolant is cooled to room temperature;

[0029] (2) Replacement of process water: Inject cold acetone into the tube side of the reactor to replace the process water. The feed rate of acetone is slowly raised to 5000kg / h. Whe...

Embodiment 2

[0034] Embodiment 2: use and the catalyst of different batches in embodiment 1

[0035] (1) Activation of the catalyst: the catalyst is filled in the tube side of the reactor, and the flow rate in the shell side of the reactor is 40m 3 / h coolant; inject process water with a flow rate of 300L / h into the tube side of the reactor to wet the catalyst, so that the liquid level in the tube side of the reactor reaches 40% and maintain it; then slowly inject hydrogen into the reaction In the tube side of the reactor, the pressure of the reaction system was raised to 2.9MPa and maintained, and then the temperature of the coolant was raised to 83°C by steam at a rate of 6°C / h to activate the catalyst with hydrogen for 20 hours. After the activation was completed, the steam heating was stopped, and the The coolant is cooled to room temperature;

[0036] (2) Replacement of process water: Inject cold acetone into the tube side of the reactor to replace the process water. The feed rate of...

Embodiment 3

[0040] Embodiment 3: use and the catalyst of different batches in embodiment 1,2

[0041] (1) Activation of the catalyst: the catalyst is filled in the tube side of the reactor, and the flow rate in the shell side of the reactor is 50m 3 / h coolant; inject process water with a flow rate of 500L / h into the tube side of the reactor to wet the catalyst, so that the liquid level in the tube side of the reactor reaches 45% and maintain; then slowly pass hydrogen into the reaction Raise the pressure of the reaction system to 3.2MPa and maintain it in the tube side of the reactor, and then raise the temperature of the coolant to 85°C at a rate of 7°C / h through steam to activate the catalyst with hydrogen for 30 hours. After the activation is complete, stop the steam heating and put The coolant is cooled to room temperature;

[0042](2) Replacement of process water: inject cold acetone into the tube side of the reactor to replace the process water, the feed rate of acetone is slowly ...

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Abstract

The invention discloses a reactor starting method for synthesizing methyl isobutyl ketone by an acetone one-step process. The method is characterized by comprising the following steps: (1) activatinga catalyst: filling a catalyst in a tube pass of a reactor, filling a coolant in a shell pass of the reactor, injecting process water into the tube pass of the reactor, introducing hydrogen to increase the pressure of a reaction system, heating and activating the coolant through steam, stopping steam heating, and cooling the coolant to room temperature; (2) replacing process water: injecting acetone into the tube pass of the reactor to replace the process water, and adding a proper amount of process water in the process; and (3) heating acetone: heating the coolant through steam, heating the acetone with steam, and slowly increasing the feeding amount of the acetone to 7.5-11 t/h when the temperature of the acetone rises to 80-85 DEG C. Compared with the prior art, the reactor starting method provided by the invention is simple in steps and can avoid over-high temperature during starting.

Description

technical field [0001] The invention relates to the technical field of methyl isobutyl ketone production, in particular to a reactor start-up method for synthesizing methyl isobutyl ketone in one step from acetone. Background technique [0002] Methyl isobutyl ketone, also known as isopropyl acetone, hexanone or 4-methyl-2-pentanone, abbreviated as MIBK, is a colorless and transparent liquid, slightly soluble in water, and completely miscible with general organic solvents , is an excellent solvent. Its volatility is not strong, it has strong tolerance to temperature, and it is not easy to be hydrolyzed in acid-base solution. At present, there are three-step and one-step industrial methods for synthesizing MIBK from acetone. Among them, the technology after the 1980s is mainly a one-step method. The reaction process is that acetone and hydrogen are simultaneously condensed in the reactor under the asynchronous and synergistic action of the bifunctional catalyst. , dehydrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/04C07C45/68
CPCC07C45/68C07C49/04
Inventor 王时良周文斌夏天昊吴尔旭胡健豪郑金成
Owner ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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