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

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...

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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 pollution, material recovery, etc., and cannot meet the needs of environmental protection and energy saving at the same time.

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