Process for preparing epoxypropane by directly using epoxidation propylene through hydrogen peroxide

A technology for epoxidizing propylene and propylene oxide, which is applied in the chemical industry, sustainable manufacturing/processing, organic chemistry, etc., can solve the problems of environmental protection and energy saving at the same time, and achieve significant economic and social benefits and energy consumption. The effect of improving safety and improving conversions

Active Publication Date: 2013-01-30
JIANGSU YIDA CHEM
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Problems solved by technology

[0009] The above disclosed methods have their own deficiencies in terms of process system energy consumption, environmental

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  • Process for preparing epoxypropane by directly using epoxidation propylene through hydrogen peroxide

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Embodiment 1

[0032] (1) if figure 1 As shown, after fresh propylene, recycled propylene, hydrogen peroxide with a mass concentration of 27.5-60% and circulating solvent are mixed by X101 mixer, the epoxidation reaction is carried out on titanium-silicon molecular sieve fixed-bed reactor R101. The reaction pressure is 10-30 bar, the temperature is 30-80° C., and the reaction solvent can be methanol, acetone or other mixture solvents.

[0033] (2) The reaction product passes through the propylene oxide crude separation tower T101, and the kettle liquid is treated with alkali substances, and then enters the solvent recovery tower T104; the pressure at the top of the crude separation tower is 10-20bar, and the temperature at the top of the tower is controlled at 30-60°C. The temperature is controlled at 60-100°C.

[0034] (3) The crude propylene oxide product is separated from unreacted propylene in the propylene flash tower T105. The top pressure of the propylene flash tower is 2-10 bar, and...

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Abstract

The invention relates to a process for preparing epoxypropane by directly using epoxidation propylene through hydrogen peroxide. The process comprises the following steps of: (1) sufficiently mixing propylene and hydrogen peroxide, conducting an epoxidation reaction in a fixed bed reactor filled with titanium silicon molecular sieves and generating epoxypropane coarse products; (2) pumping the epoxypropane coarse products into a coarse tower trough a pump and conducting crude separation on unreacted propylene and epoxypropane; (3) enabling coarse component products to pass through a propylene flashing tower and then enter a light component recovery tower; (4) compressing the propylene separated by the coarse tower and the light component recovery tower and light components through a compressor, entering a non-condensable gas separation tower, enabling the propylene to enter a recycling and reusing system from the bottom of the separation tower, and enabling tail gas to be discharged through a tail gas absorption device; and (5) conducting extractive distillation on the epoxypropane treated by the light component recovery tower in a epoxypropane purification tower to obtain high purity epoxypropane products. The process is energy-saving, environment-friendly, safe, suitable to industrial production and capable of producing obvious economic and social benefits.

Description

technical field [0001] The invention relates to a process for directly epoxidizing propylene with hydrogen peroxide to prepare propylene oxide. It belongs to the field of petrochemical industry. Background technique [0002] Propylene oxide is an important basic organic chemical raw material. It is the third largest organic chemical product in the production of propylene derivatives after polypropylene and acrylonitrile. It is mainly used in the production of polyether, propylene glycol, isopropanolamine, non- Polyether polyols, etc., and then produce unsaturated polyester resins, polyurethanes, surfactants, flame retardants, etc., which are widely used in chemical, light industry, pharmaceutical, food, textile and other industries, and have far-reaching implications for the development of the chemical industry and the national economy. Impact. With the expansion of PO use and the growth of downstream product usage, the demand of PO market is increasing. [0003] At prese...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D301/32C07D303/04
CPCY02P20/10
Inventor 刘准曹惠庆张虎吴建磊陈惠华
Owner JIANGSU YIDA CHEM
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