Preparation method of propylene oxide

A technology for propylene oxide and epoxidation reaction, which is applied in the production of bulk chemicals, organic chemistry, etc., can solve the problems of affecting the production of propylene oxide, a large amount of chlorine-containing wastewater, inconvenient transportation, etc., and achieves low production cost and process flow. Short, low running costs

Active Publication Date: 2018-11-30
河北美邦工程科技股份有限公司
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Problems solved by technology

The chlorohydrin method uses propylene and chlorine gas as raw materials to obtain propylene oxide after chlorohydrinization, saponification, and refining processes. However, a large amount of chlorine-containing wastewater is produced during the production process, which pollutes the environment and severely corrodes the equipment.
The co-oxidation method is divided into ethylbenzene hydroperoxide method (PO / SM method), isobutane hydroperoxide method (PO / TBA method) and cumene hydroperoxide method (CHP method) according to different raw materials. It overcomes the shortcomings of the chlorohydrin method such as pollution and corrosion, but the process is long, the investment is large, and there are many co-products. Due to the many co-products, the production of propylene oxide is affected to a certain extent
The direct oxidation method is propylene and H 2 o 2 In the presence of a special titanium-silicon catalyst, the direct reaction generates propylene oxide. The advantages of this process are no co-production products, simple process, low investment cost and environmental protection. The disadvantage is that H 2 o 2 The high cost and inconvenient transportation of large quantities require the construction of H 2 o 2 device

Method used

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  • Preparation method of propylene oxide

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Effect test

Embodiment 1

[0043] Embodiment 1 A kind of preparation method of propylene oxide comprises the following steps:

[0044] (1) High temperature reaction unit

[0045] Toluene, air, and propylene were pretreated to a pressure of 1.4 MPa and a temperature of 110 ºC before being added to the high-temperature reactor;

[0046]Add the pretreated toluene, air, and propylene into a high-temperature reactor equipped with an oxidation catalyst and an epoxidation catalyst. The mol ratio of oxygen, propylene, and toluene in the air is 2:0.1:1, and the temperature is 110 ºC. Under the condition of a pressure of 1.3 MPa, under the action of an oxidation catalyst, toluene undergoes an oxidation reaction with oxygen in the air to generate benzyl hydroperoxide, and the generated benzyl hydroperoxide reacts with propylene under the action of an epoxidation catalyst. Oxidation reaction produces propylene oxide and benzyl alcohol, and the reaction residence time is 45 min, obtains the high-temperature reactio...

Embodiment 2

[0068] Embodiment 2 A kind of preparation method of propylene oxide comprises the following steps:

[0069] (1) High temperature reaction unit

[0070] Toluene, air, and propylene were pretreated to a pressure of 1.5 MPa and a temperature of 120 ºC before being added to the high-temperature reactor;

[0071] Add the pretreated toluene, air, and propylene into a high-temperature reactor equipped with an oxidation catalyst and an epoxidation catalyst. The mol ratio of oxygen, propylene, and toluene in the air is 3:0.2:1, and the temperature is 120 ºC. Under the condition of a pressure of 1.5 MPa, under the action of an oxidation catalyst, toluene undergoes an oxidation reaction with oxygen in the air to form benzyl hydroperoxide, and the formed benzyl hydroperoxide reacts with propylene under the action of an epoxidation catalyst. Oxidation reaction produces propylene oxide and benzyl alcohol, and the reaction residence time is 50 min, obtains the high-temperature reaction liqu...

Embodiment 3

[0093] Embodiment 3 A kind of preparation method of propylene oxide comprises the following steps:

[0094] (1) High temperature reaction unit

[0095] Toluene, air, and propylene were pretreated to a pressure of 1.6MPa and a temperature of 180 ºC before being added to the high-temperature reactor;

[0096] Add pretreated toluene, air, and propylene into a high-temperature reactor equipped with an oxidation catalyst and an epoxidation catalyst. The mol ratio of oxygen, propylene, and toluene in the air is 4:0.3:1, and the temperature is 180 ºC. Under the condition of a pressure of 1.5 MPa, under the action of an oxidation catalyst, toluene undergoes an oxidation reaction with oxygen in the air to form benzyl hydroperoxide, and the formed benzyl hydroperoxide reacts with propylene under the action of an epoxidation catalyst. Oxidation reaction produces propylene oxide and benzyl alcohol, and the reaction residence time is 60 min, obtains the high-temperature reaction liquid co...

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Abstract

The invention discloses a preparation method of propylene oxide. Toluene, molecular oxygen and propylene are taken as raw materials, and the propylene oxide is prepared through a high-temperature reaction unit, a low-temperature reaction unit, a light component removal unit, a propylene removal unit, a propylene oxide removal unit, a propylene oxide refining unit and a toluene removal unit. The preparation method is an improvement on the basis of a method for preparing propylene oxide through a toluene oxidation reaction and a propylene epoxidation reaction. Compared with the existing processfor preparing propylene oxide, the preparation method provided by the invention has the advantages of high one-way toluene conversion rate, high reaction selectivity, high conversion rate, low energyconsumption, short technological process, and low operation cost.

Description

technical field [0001] The invention relates to a method for preparing organic matter, in particular to a method for preparing propylene oxide. Background technique [0002] Propylene oxide (PO) is the third largest propylene derivative except polypropylene and acrylonitrile. It is an important basic organic chemical raw material, mainly used in the production of polyether, propylene glycol, etc., and it is also the fourth generation of non-ionic detergents. The main raw material of surfactants, oilfield demulsifiers, pesticide emulsifiers, etc. PO derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. The currently industrialized production methods of propylene oxide include: chlorohydrin method, co-oxidation method and direct oxidation method. The chlorohydrin method uses propylene and chlorine gas as raw materials to obtain propylene oxide after chlorohydrinization, saponification, and refining processes. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/04C07D301/19C07D301/32
CPCC07D301/04C07D301/19C07D301/32C07D303/04Y02P20/52
Inventor 马东兴吴迪王勐张玉妹刘永英李彦欣李丽王素霞宛悍东
Owner 河北美邦工程科技股份有限公司
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