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Method for inhibiting ethylbenzene hydroperoxide decomposition

A technology of ethylbenzene hydroperoxide and ethylbenzene, which is applied in the direction of peroxygen compound preparation, chemical instruments and methods, organic chemistry, etc., can solve problems such as unproposed solutions, and achieve the goal of reducing scaling problems and reducing by-products Effects that generate and improve stability

Active Publication Date: 2018-12-18
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the relevant problems in the prior art, no effective solution has been proposed yet

Method used

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  • Method for inhibiting ethylbenzene hydroperoxide decomposition
  • Method for inhibiting ethylbenzene hydroperoxide decomposition
  • Method for inhibiting ethylbenzene hydroperoxide decomposition

Examples

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Embodiment 1

[0051] A method for inhibiting the decomposition of ethylbenzene hydroperoxide, comprising the steps of:

[0052] Carried out in three identical bubble tower oxidation reactor devices, ethylbenzene and bisphosphonate compounds are mixed through a mixer, and then enter the first oxidation reactor, nitrogen and oxygen mixed gas containing 25v% oxygen Enter from the bottom of the reactor, and react, wherein the general formula of the bisphosphonate compound is as follows:

[0053]

[0054] In the above general formula, R 1 Methyl, R 2 is n-butyl, R 3 For n-propyl. In the first oxidation reactor, the ethylbenzene feed rate is 1kg / h, and the content of bisphosphonate compounds in the control ethylbenzene feed is 90mg / kg, and the reaction temperature is 155°C, and the reaction pressure is 0.25MPa. The phase residence time is 40min, then enters the second reactor, the reaction temperature is 152°C, the reaction pressure is 0.25MPa, the reaction liquid phase residence time is 4...

Embodiment 2

[0056] A method for inhibiting the decomposition of ethylbenzene hydroperoxide, comprising the steps of:

[0057] It is carried out in four identical bubble tower oxidation reactor devices. After mixing ethylbenzene and bisphosphonate compounds through a mixer, they enter the first oxidation reactor, and the mixed gas of nitrogen and oxygen containing 20v% oxygen Enter from the bottom of the reactor, and react, wherein the general formula of the bisphosphonate compound used is as follows:

[0058]

[0059] In the above general formula, R 1 is ethyl, R 2 is n-propyl, R 3 For n-butyl. In the first oxidation reactor, the feed amount of ethylbenzene is 1kg / h, the additive content in the ethylbenzene feed is controlled to be 120mg / kg, the reaction temperature is 165°C, the reaction pressure is 0.23MPa, and the residence time of the reaction liquid phase is 35min , then enter the second reactor, the reaction temperature is 160 ° C, the reaction pressure is 0.23 MPa, the react...

Embodiment 3

[0061] A method for inhibiting the decomposition of ethylbenzene hydroperoxide, comprising the steps of:

[0062] Carried out in five identical bubble tower oxidation reactor devices, after mixing ethylbenzene and bisphosphonate compounds through a mixer, enter the first oxidation reactor, nitrogen and oxygen mixed gas containing 23v% oxygen Enter from the bottom of the reactor, and react, wherein the general formula of the bisphosphonate compound used is as follows:

[0063]

[0064] In the above general formula, R 1 is isobutyl, R 2 is n-hexyl, R 3 for hydrogen. In the first oxidation reactor, the feed amount of ethylbenzene is 1kg / h, the additive content in the ethylbenzene feed is controlled to be 130mg / kg, the reaction temperature is 165°C, the reaction pressure is 0.20MPa, and the residence time of the reaction liquid phase is 35min , then enter the second reactor, the reaction temperature is 163 ° C, the reaction pressure is 0.20 MPa, the reaction liquid phase re...

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Abstract

The invention discloses a method for inhibiting ethylbenzene hydroperoxide decomposition. The method comprises the step of adding a diphosphonate ester compound during the preparation process of ethylbenzene hydroperoxide. According to the method provided by the invention, the oxidized formed ethylbenzene hydroperoxide decomposition can be effectively inhibited, the method is particularly suitablefor an SMPO process, the stability of the intermidiate ethylbenzene hydroperoxide in the process is improved, meanwhile, metal cations such as sodium or potassium cannot be introduced, the scaling problem caused by material entrainment is reduced, the generation of by-products such as methyl phenyl carbinol and methyl phenyl ketone in the reaction system is reduced, and the reaction selectivity and the yield are improved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for inhibiting the decomposition of ethylbenzene hydroperoxide. Background technique [0002] Ethylbenzene hydroperoxide is an intermediate in the joint production process of propylene oxide and styrene. The joint production process of propylene oxide and styrene is called SMPO process for short. Oxygen is used to oxidize ethylbenzene peroxide in the medium to generate ethylbenzene peroxide, and the generated ethylbenzene hydroperoxide enters the epoxidation process after being concentrated, and epoxidation reaction occurs with propylene to generate propylene oxide and α-methyl benzyl alcohol, epoxy The chemical reaction solution is distilled to obtain propylene oxide, and α-methyl benzyl alcohol is dehydrated under normal pressure to generate styrene. The characteristic of the SMPO co-production method is that it does not require high-temperature reaction and can ...

Claims

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Application Information

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IPC IPC(8): C07C407/00C07C409/08
CPCC07C407/00C07C409/08
Inventor 王凯傅送保王兴永侯章贵
Owner CHINA NAT OFFSHORE OIL CORP
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