A method for reducing the unit consumption of cumene in the process of producing propylene oxide by co-oxidation of cumene

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 cumene loss, economic benefit reduction, and increased cumene loss, etc. achieve low cost

Active Publication Date: 2022-08-05
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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  • A method for reducing the unit consumption of cumene in the process of producing propylene oxide by co-oxidation of cumene
  • A method for reducing the unit consumption of cumene in the process of producing propylene oxide by co-oxidation of cumene
  • A method for reducing the unit consumption of cumene in the process of producing propylene oxide by co-oxidation of cumene

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

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

[0045] The foamed carbon prepared by using coal and coal-based substances as raw materials is used as a carrier: 99.5 g of the prepared foamed carbon is taken and placed in a three-necked bottle, and a small amount of distilled water is added for dispersion. The chloropalladium acid solution containing 0.5 g of Pd was added to a three-necked flask under stirring conditions at 40 °C in a water bath for adsorption. After adsorption, excess formaldehyde was added to a water bath at 60 °C for reduction for 6 hours. After suction filtration and washing, it was dried at 400 °C for 4 hours under nitrogen atmosphere. The carbon foam supported Pd catalyst A was obtained, and the loading amount of Pd was 0.5%.

[0046] Catalyst B with a Pd loading of 0.1% was prepared by changing the loadings of the carrier and chloropalladic acid.

Embodiment 1

[0048] The cumene heavy component stream 1 obtained by rectifying and recovering cumene in the dimethylbenzyl alcohol hydrogenolysis reaction solution contains 9.0% cumene, 21.0% dimethylbenzyl alcohol, 24.0% 2 - Phenyl-n-propanol, 45% cumene.

[0049] The hydrogenation reactor was charged with 0.5% Pd-loaded catalyst A on foamed carbon.

[0050] (a) The 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 volumetric space velocity is 2.0h -1 , wherein heavy components such as cumene take place rapid cracking reaction to generate the logistics 3 containing cumene, α-methylstyrene (AMS);

[0051] (b) material 3 obtains material 4 after being cooled to 50 ℃, material 4 enters the hydrogenation reactor of loading palladium / foamed carbon catalyst A together with circulating hydrogen material 8, fresh hydrogen and feeds material 9, in material 4, α- The hydrog...

Embodiment 2～9

[0055] The difference from Example 1 is:

[0056] Change the pressure, temperature, 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 Results of Examples 1 to 9

[0058]

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

[0060]

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

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Abstract

The invention discloses a method for reducing the unit consumption of cumene in the process of producing propylene oxide by a cumene co-oxidation method. In the process of producing propylene oxide by co-oxidation of cumene, heavy components such as cumene are produced by hydrogenolysis of dimethylbenzyl alcohol to prepare cumene. The invention converts the heavy component into cumene for recycling and reuse through two steps of thermal cracking and catalytic hydrogenation, and significantly improves the economy and competitiveness of the cumene co-oxidation method for producing propylene oxide.

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 a cumene co-oxidation method. Through a two-step reaction of thermal cracking and catalytic hydrogenation, dimethylbenzyl alcohol is hydrogenolyzed to prepare isopropyl benzene in the process. The heavy component cumene, which is 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, and the like. The traditional method of propylene oxide preparation has problems of equipment corrosion and environmental pollution, and other methods have shortcomings such as long process flow, large engineering investment, many by-products, and poor safety. At present, the POCHP method of cumene hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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