Preparation and application of low-toxicity and high-efficiency polymerization inhibitor for acrylonitrile device

Abstract

The invention discloses a high-efficiency polymerization inhibitor in the production process of acrylonitrile. According to the polymerization inhibitor, the polymerization inhibiting efficiency of asingle component is greatly improved by using a synergistic effect among compounds of different types; by introducing a quiet dispersion component and a metal passivation component, related problems caused by dirt deposition can be effectively solved. By adoption of the water-soluble high-efficiency polymerization inhibitor disclosed by the invention, dirt formed by free radical polymerization anddispersion can be effectively inhibited and is uniformed dispersed in a material flow, and thereby precipitation of the dirt in an acrylonitrile producing device is avoided, and the production running period of the device can be prolonged.

Description

technical field [0001] The application belongs to the field of acrylonitrile production, and in particular relates to a preparation method and application of a low-toxicity and high-efficiency polymerization inhibitor used in the refining system of an acrylonitrile plant. Background technique [0002] Acrylonitrile is a chemical intermediate with a wide range of uses, and is the basic raw material for synthetic fibers, synthetic rubber, and synthetic plastics. Acrylonitrile is relatively important in the series of propylene products. In the world, the output of acrylonitrile is only less than that of polypropylene in the series of propylene products, ranking second. However, in the production process, due to the double bond in its structural formula, its chemical properties are relatively active, and chemical reactions such as self-polymerization, copolymerization, and hydrolysis will occur. This leads to a drop in product yield and polymer deposits in the system, causing b...

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Problems solved by technology

However, because (1) hydroquinone itself is a retarder, it is slow to terminate the free radical reaction, so more polymers will still be produced in the production process, which is the main factor affecting the long-term operation of the acrylonitrile plant

The blockage of the above-mentioned units and equipment will cause material loss, plant shutdown and safety and environmental protection problems, which will seriously affect and restrict the long-term safe and stable operation of the acrylonitrile plant

(2) Hydroquinone itself is a solid and needs to be prepared with water on site. Due to the low solubility, the preparation time is relatively long. During the preparation process, it is easy to cause flying dust and affect the health of employees.

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