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Catalytic distillation method of olefine direct epoxidation

A technology of catalytic distillation and epoxidation, applied in chemical industry, organic chemistry, sustainable manufacturing/processing, etc., can solve the problems of complex structure of reaction device, high energy consumption of solvent recovery, and ineffective utilization of reaction heat, etc. Achieve the effects of high utilization rate of reaction heat, reduced energy consumption, and simple device structure

Inactive Publication Date: 2006-11-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the reaction device of this process is complicated, the energy consumption of solvent recovery is large, and a large amount of reaction heat has not been effectively utilized.

Method used

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  • Catalytic distillation method of olefine direct epoxidation

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specific Embodiment approach

[0019] The reaction process that adopts the method for catalytic distillation to carry out olefin epoxidation can have following several specific embodiments, but the present invention is not limited thereto:

[0020] One of the implementation methods:

[0021] For the system of olefins with low boiling point and easy vaporization and the boiling point of the product is lower than the reaction temperature, the olefins can enter the tower from the lower end of the reaction section in one or more stages, and the oxidant hydrogen peroxide and solvent enter the tower from the upper end of the reaction section , After the olefin is vaporized, it mixes with the descending hydrogen peroxide and solvent during the rising process, contacts with the catalyst and reacts. At the same time, the heat released by the reaction vaporizes the solvent, removes the heat, and limits the temperature rise of the reaction section, thereby achieving the purpose of removing heat and controlling the tem...

Embodiment 1

[0033] This example is the direct epoxidation of propylene to propylene oxide.

[0034] The reaction raw materials are 27% industrial hydrogen peroxide, more than 99.9% polymer grade industrial propylene, and the solvent is analytically pure methanol. Hydrogen peroxide is fed into the reaction section of the tower from the upper inlet of the reaction section by a metering pump, and the propylene after decompression and steady flow is metered by a mass flow meter and then enters the tower from the lower inlet of the reaction section. The molar ratio of hydrogen peroxide is 2.5:1. After the device is started, methanol is first injected from the upper part of the reaction section, and after the device runs stably, propylene and hydrogen peroxide are added, and methanol is added at the same time until the molar ratio of propylene to methanol in the reaction section is 1:8. The reaction conditions are as follows: the temperature of the reaction section is controlled at 60°C, the r...

Embodiment 2

[0036] This example is the direct epoxidation of propylene to propylene oxide.

[0037] Reaction raw material and solvent are with embodiment 1. Propylene and hydrogen peroxide are fed in a molar ratio of 4:1, and the molar ratio of propylene to methanol in the reaction section is 1:12. The reaction conditions are: the temperature of the reaction section is controlled at 70°C, the reaction pressure is 0.2MPa (absolute pressure), and the mass space velocity of propylene is 3.5h -1 . Process operation method is the same as embodiment 1. Reaction result: the conversion rate of hydrogen peroxide is 100%, and the selectivity of hydrogen peroxide epoxidation is 97.3%.

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Abstract

A catalytic distiling process for directly epoxidating olefine features that a tower which is vertically and sequentially divided into distilling segment, reaction segment and desorption segment is only used, and includes reacting between olefine, hydrogen peroxide, solvent and Ti-Si molecular sieve catalyst, condensing the excessive solvent and olefine and returning them back to reaction segment, and separating product from the substance discharged from tower bottom. Its advantages are high thermal efficiency and less energy consumption.

Description

technical field [0001] The invention relates to a method for epoxidizing olefins and hydrogen peroxide to generate organic epoxides with high selectivity under the catalysis of titanium-silicon molecular sieves. Background technique [0002] Typical bulk organic epoxides are ethylene oxide, propylene oxide and epichlorohydrin, which are basic organic chemical raw materials with a wide range of uses. For ethylene oxide, the current main production method is the process of direct epoxidation of ethylene and oxygen gas phase catalyzed by a silver catalyst with excellent performance. This process has advanced technology and economy, and the production process is basically pollution-free. For propylene oxide, the current production methods mainly include the chlorohydrin method and the co-oxidation method. Among them, the chlorohydrin method has high material consumption and energy consumption, serious equipment corrosion, and high cost for the treatment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D305/06
CPCY02P20/10
Inventor 杜泽学张永强凌云
Owner CHINA PETROLEUM & CHEM CORP
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