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Method for reducing unit consumption of cumene in epoxypropane production process using cumene co-oxidation method

A technology of propylene oxide and co-oxidation method, which is applied in the production of bulk chemicals, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of inability to expand large-scale, increase of unit consumption of cumene, and increase of cumene loss and other issues, to achieve the effect of improving technical economy, reducing unit consumption, and reducing unit consumption

Active Publication Date: 2021-01-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dimethyl benzyl alcohol hydrogenolysis catalyst developed by patent CN110075857A has a conversion rate of 99.9% and a selectivity of 99.0%, but 1% of heavy components still exist, resulting in the loss of cumene
[0008] Aiming at the problem that the unit consumption of cumene increases due to the loss of dimethyl benzyl alcohol caused by the unstable hydrogenolysis catalyst of dimethyl benzyl alcohol, the patent CN104844493A proposes to react dimethyl benzyl alcohol with CHP to generate dicumyl peroxide (DCP ), but due to the small DCP takeaway market, the process cannot be expanded on a large scale
[0009] In short, during the intermediate reaction involving cumene, a large amount of heavy components will inevitably be generated, which increase the loss of cumene and reduce the overall economic benefits of the device

Method used

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  • Method for reducing unit consumption of cumene in epoxypropane production process using cumene co-oxidation method
  • Method for reducing unit consumption of cumene in epoxypropane production process using cumene co-oxidation method
  • Method for reducing unit consumption of cumene in epoxypropane production process using cumene co-oxidation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] The preparation of palladium / foam carbon catalyst in the embodiment:

[0045] Foamed carbon prepared from coal and coal series as the carrier: take 99.5 g of the prepared foamed carbon and put it into a three-necked bottle, add a small amount of distilled water to disperse. The chloropalladium acid solution containing 0.5gPd was added to a three-necked flask under the condition of stirring at 40°C in a water bath for adsorption. After the adsorption was completed, excess formaldehyde was added to a water bath at 60°C for reduction for 6 hours. A foamed carbon-supported Pd catalyst A is obtained, and the loading amount of Pd is 0.5%.

[0046] Catalyst B with Pd loading of 0.1% was prepared by changing the loading of support and chloropalladium acid.

Embodiment 1

[0048] In the cumene heavy component stream 1 obtained after rectification recovery of cumene in the dimethyl benzyl alcohol hydrogenolysis reaction liquid, containing 9.0% cumene, 21.0% dimethyl benzyl alcohol, 24.0% 2 - Phenyl-n-propanol, 45% cumene.

[0049] The hydrogenation reactor was filled with catalyst A with 0.5% Pd supported on foamed carbon.

[0050] (a) Cumene heavy component stream 1 enters from the upper end of the cracking reactor, the temperature of the cracking reactor is 300°C, the reaction pressure is 1.0MPaG, and the volume space velocity is 2.0h -1 , wherein heavy components such as cumene undergo rapid cracking reactions to generate stream 3 containing cumene and α-methylstyrene (AMS);

[0051] (b) stream 3 obtains stream 4 after being cooled to 50 DEG C, and stream 4 enters the hydrogenation reactor of packing palladium / foam carbon catalyst A together with circulating hydrogen stream 8 and fresh hydrogen, and α- Methyl styrene and dimethyl benzyl alco...

Embodiment 2～9

[0055] The difference with embodiment 1 is:

[0056] Change the pressure, temperature and space velocity of the reactor. The hydrogenation catalyst used was Catalyst B. The specific reaction conditions and results are shown in Table 2.

[0057] Table 2 Embodiment 1~9 result

[0058]

[0059] The conversion rates of dimethyl benzyl alcohol and cumene in the above table represent the total reaction effect after passing through the cracking reactor and the hydrogenation reactor. Wherein the dimethyl benzyl alcohol conversion test method: measure the mass concentration of the dimethyl benzyl alcohol of stream 1, stream 10 respectively, calculate according to the following formula,

[0060]

[0061] Where n is the mass flow ratio of stream 10 and stream 1, which can be simply calculated according to the following formula, and n≈3 in Examples 1-9. Since a small amount of water is generated during the cracking reaction, the flow ratio calculated by the following formula wil...

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Abstract

The invention discloses a method for reducing unit consumption of a cumene in epoxypropane production process using a cumene co-oxidation method. In a process for producing epoxypropane by a cumene co-oxidation method, heavy components such as diisopropylbenzene and the like are byproduced when cumene is prepared by hydrogenolysis of dimethyl benzyl alcohol. According to the invention, a heavy component is converted into cumene through two steps of thermal cracking and catalytic hydrogenation to be recycled, so that the economical efficiency and competitiveness of a process for producing epoxypropane through a cumene co-oxidation method are remarkably improved.

Description

technical field [0001] The invention relates to a method for reducing the unit consumption of cumene in the process of producing propylene oxide by the co-oxidation of cumene. Through the two-step reaction of thermal cracking and catalytic hydrogenation, dimethyl benzyl alcohol in the process is hydrogenolyzed to prepare isopropyl The heavy component of cumene, a by-product of the benzene process, is converted into cumene for reuse. Background technique [0002] Cumene is used as an important intermediate material in various chemical industries, polymer industries, etc. Currently, most of the cumene (cumene) produced is used in the preparation of phenol, acetone, etc. The traditional method of preparing propylene oxide has problems of equipment corrosion and environmental pollution. Other methods have disadvantages such as long process flow, large engineering investment, many by-products, and poor safety. At present, the POCHP method of cumene hydroperoxide is the research ...

Claims

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Application Information

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IPC IPC(8): C07C4/24C07C7/00C07C7/163C07C7/148C07C15/085B01J23/44
CPCC07C4/24C07C7/005C07C7/163C07C7/148B01J23/44C07C15/085Y02P20/52
Inventor 叶建初虞根海金贞顺张宏科
Owner WANHUA CHEM GRP CO LTD
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