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Method for gas-phase epoxidation reaction of olefin and hydroperoxide

A technology of epoxidation reaction and hydroperoxide, applied in the direction of organic chemistry, bulk chemical production, etc., can solve the problem that hydroperoxide cannot be completely reacted, the heat of epoxidation reaction cannot be used, and the production cost of epoxide can be reduced etc. to achieve the effects of reducing the amount of decomposition, increasing the utilization rate of energy, increasing the reaction rate and conversion rate

Active Publication Date: 2021-01-05
CHANGZHOU RUIHUA CHEM ENG&TECH
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Problems solved by technology

[0025] Aiming at the problems that the high-pressure low-temperature liquid phase method is adopted for the existing epoxidation reaction, the residence time of the reactants is long, the heat of the epoxidation reaction cannot be utilized, and the hydroperoxide cannot be completely reacted, the present invention proposes a method for olefin and hydrogen The method of gas-phase epoxidation of peroxide greatly reduces the production cost of epoxide

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  • Method for gas-phase epoxidation reaction of olefin and hydroperoxide

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Embodiment 2

[0049] Implementation 2: 0.5MPa, with nitrogen as the carrier gas, 30% (wt) hydrogen peroxide is atomized and gasified at 140°C, the residence time in the gas phase is 1 second, and then quenched to room temperature, and the decomposition rate of hydrogen peroxide is tested, as shown in Table 2:

[0050] serial number h 2 o 2 Concentration before gasification (%)

h 2 o 2 Concentration after gasification (%)

concentration change Decomposition rate (%) 1 10.448 10.082 0.335 3.508 2 8.432 8.291 0.198 1.667 3 6.509 6.468 0.096 0.624 4 5.043 5.030 0.049 0.247 5 4.096 4.091 0.029 0.119 6 3.114 3.112 0.013 0.041 7 2.303 2.302 0.007 0.016 8 1.112 1.110 0.002 0.002

[0051] Table 2 is the hydrogen peroxide vapor phase decomposition rate table.

[0052] It can be seen that, in the case of controlling the residence time, the decomposition rate of hydrogen peroxide produced by high temperature...

Embodiment 1

[0054] Example 1, such as figure 1 As shown, the equipment involved in this system is mainly an integrated reactor. In this embodiment, the integrated reactor is divided into two sections, the lower section is a shell-and-tube heat exchange section, and the upper section is a tube-and-tube reaction section.

[0055] Such as figure 1 As shown, this embodiment relates to a method for gas-phase epoxidation of propylene and hydrogen peroxide, and the specific process is as follows: proportioning raw materials according to the molar ratio of propylene and hydrogen peroxide in a ratio of 1:6, and the concentration of hydrogen peroxide is 30% ( wt); at 1.0MPa, gasify propylene and preheat to 120°C, add hydrogen peroxide into the gaseous propylene stream, and preheat the hydrogen peroxide to 10°C below the self-accelerating decomposition temperature SADT to reduce the amount of thermal decomposition of hydrogen peroxide. The temperature is slightly different for different peroxides; ...

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Abstract

The invention relates to a method for a gas-phase epoxidation reaction of olefin and hydroperoxide. The method comprises the following steps: a, proportioning raw materials; b, preheating and gasifying olefin; c, spraying a hydroperoxide raw material to the gasified gas-phase olefin to form a gas-liquid mixture flow; d, increasing the temperature of the gas-liquid mixture flow, and completely gasifying the gas-liquid mixture flow to form a gas-phase epoxidation reaction flow; e, carrying out an epoxidation reaction in the presence of an epoxidation catalyst to form an epoxide discharged material; and transferring heat released by the epoxidation reaction; and f, carrying out heat exchange on the epoxide discharge material and the gas-liquid mixture flow in the step d, and then leaving theepoxidation reaction system to carry out a subsequent process to obtain epoxypropane. According to the method, a set of rapid and high-temperature reaction circulation process is formed, the decomposition amount of the raw materials is reduced, the reaction rate and conversion rate are increased, and meanwhile, the economy of the epoxidation reaction is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical and chemical reaction, and in particular relates to a gas-phase reaction method for epoxidation of olefins and hydroperoxides, and is particularly suitable for the epoxidation reaction of propylene and hydroperoxides. Background technique [0002] Propylene oxide is one of the important intermediates in petrochemical industry. Among the propylene derivatives, propylene oxide is currently the third largest derivative after polypropylene and acrylonitrile. Propylene oxide is mainly used in the industry to prepare polyether polyols, propylene glycol, alcohol amines and various nonionic surfactants, and its derivatives are widely used in petrochemical, construction, home appliances, automobiles, medicine, pesticides, textiles, Japanese chemical and other industries. [0003] The traditional production method of propylene oxide is the chlorohydrin method, which is characterized by relatively short p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12C07D303/04
CPCC07D301/12C07D303/04Y02P20/52
Inventor 徐志刚吴非克牛锦森倪风超
Owner CHANGZHOU RUIHUA CHEM ENG&TECH
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