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A kind of production method of chemical fiber grade cyclohexanone

A production method and cyclohexanone technology are applied in the production field of chemical fiber grade cyclohexanone, can solve the problems of increased ton ketone benzene consumption, increased production cost, increased ton ketone energy consumption, etc., and achieve low material consumption, strong removal capacity, The effect of low energy consumption

Active Publication Date: 2011-12-14
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter method can remove hexanal better, but other impurities still affect the microscopic quality of cyclohexanone
Compared with the production of solvent ketone, the energy consumption of xanthone in the latter method increases by 0.3 tons, and the consumption of xanthone and benzene increases by 30 kilograms, resulting in a substantial increase in the production cost of cyclohexanone for caprolactam compared with solvent ketone

Method used

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  • A kind of production method of chemical fiber grade cyclohexanone
  • A kind of production method of chemical fiber grade cyclohexanone
  • A kind of production method of chemical fiber grade cyclohexanone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The specifications of the adsorption column are: column height: 1000mm, inner diameter: 50mm, volume: 1.96L. 1400g molecular sieves are loaded into the adsorption column. Pass the cyclohexanone solution from the bottom of the adsorption column, the content of hexanal in the solution is 70mg / kg, the content of 2-heptanone is 100mg / kg, the flow rate of cyclohexanone is about 2.2L / h, and the total feed volume is 58L. The adsorption data are shown in Table 1:

[0016]

[0017] After the adsorption test, the cyclohexanone vapor at 160° C. is used for desorption, and the cyclohexanone vapor contains less than 30 mg / kg of the total amount of hexanal and 2-heptanone. The cyclohexanone vapor is introduced from the top of the adsorption column, and the condensate is discharged from the bottom, and the whole desorption lasts for 26 minutes.

[0018] After the desorption was completed, when the temperature dropped to room temperature, the adsorption test was carried o...

Embodiment 2

[0022] The specifications of the adsorption column are: column height: 1000mm, inner diameter: 50mm, volume: 1.96L. Add 1204g molecular sieves to the adsorption column. Pass through the cyclohexanone solution from the bottom of the adsorption column, which contains 100 mg / kg of hexanal and 60 mg / kg of 2-heptanone. The flow rate of cyclohexanone is about 65ml / min. The adsorption data are shown in Table 3:

[0023]

[0024] After the adsorption test, the cyclohexanone vapor at 160° C. was used for desorption, and the cyclohexanone vapor contained the total amount of hexanal and 2-heptanone less than 36 mg / kg. The cyclohexanone vapor is introduced from the top of the adsorption column, and the condensate is discharged from the bottom, and the whole desorption lasts for 60 minutes.

[0025] After the desorption was completed, when the temperature dropped to room temperature, the adsorption test was carried out again. The test method was the same as the above method, and t...

Embodiment 3

[0029] The specifications of the adsorption column are: column height: 1000mm, inner diameter: 50mm, volume: 0.35L. Add 251g molecular sieves to the adsorption column. Pass into cyclohexanone solution from the bottom of the adsorption column, wherein containing hexanal is 55mg / kg, and 2-heptanone is 68mg / kg. The flow rate of cyclohexanone is about 5.6ml / min. The adsorption data are shown in Table 5:

[0030]

[0031] After the adsorption test, the cyclohexanone vapor at 160° C. was used for desorption, and the cyclohexanone vapor contained the total amount of hexanal and 2-heptanone less than 36 mg / kg. The cyclohexanone vapor is introduced from the top of the adsorption column, and the condensate is discharged from the bottom, and the whole desorption lasts for 60 minutes.

[0032] After the desorption was completed, when the temperature dropped to room temperature, the adsorption test was carried out again. The test method was the same as the above method, and the data ...

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Abstract

The invention discloses a method for producing chemical fiber grade cyclohexanone. The method comprises the following steps of: putting a high-silicon-content HJT02 molecular sieve which is subjected to dealumnization treatment and aperture modification into an absorption column which is vertically arranged; allowing solvent type cyclohexanone to enter from the bottom of the absorption column andflow out from the upper part of the absorption column, and absorbing; and desorbing by using steam of the chemical fiber grade cyclohexanone after the absorption is finished. By the method, the totalamount of hexaldehyde and 2-heptanone in treated cyclohexanone is less than 36mg / kg, and the standard of chemical fiber grade ketone is reached; and the method has the advantages of low energy consumption and material consumption, and is an ideal method for producing the chemical fiber grade cyclohexanone.

Description

technical field [0001] The invention relates to a production method of cyclohexanone, in particular to a production method of chemical fiber grade cyclohexanone. Background technique [0002] In the process of preparing cyclohexanone by cyclohexane air oxidation method, due to the side reactions in the oxidation reaction and decomposition reaction, the intermediate product crude ketone alcohol contains various impurities. In the product refining process, because the physical and chemical properties of the impurities hexanal and 2-heptanone are very similar to cyclohexanone, it is difficult to separate these two impurities. And these two kinds of impurities are important factors that affect the downstream product caprolactam quality index volatile alkali of cyclohexanone, so removing these two kinds of impurities has just become the key point of producing high-quality cyclohexanone. There are two traditional refining methods for cyclohexanone: one method is to greatly increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/403C07C45/79B01D15/08
Inventor 黎树根高伟罗际安李勇军邱枫
Owner CHINA PETROCHEMICAL CORP
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