Water soluble dispersing scale inhibitor and application of water soluble dispersing scale inhibitor in acrylonitrile production device

Abstract

The invention discloses a water soluble dispersing scale inhibitor and an application of the water soluble dispersing scale inhibitor in an acrylonitrile production device. The water soluble dispersing scale inhibitor comprises a component A, a component B and a component C. The component A is a copolymer of aryl sulfonate and formaldehyde. The component B is one or more of magnesium sulfate, potassium sulfate and magnesium sulfite. The component C is one or more of 2,6-di-tert-butylphenol, diethylhydroxylamine and isopropyl hydroxylamine. The mass ratio of the component A to the component B to the component C is 10-50:1-10:1-10. By adopting the water soluble dispersing scale inhibitor, scale formed by free radical polymerization and dispersion can be effectively inhibited, so that the scale is uniformly dispersed in a water phase, thus, the situation that the scale is precipitated in the acrylonitrile production device is avoided, and the production operation cycle of the device can be prolonged.

Description

technical field [0001] The invention belongs to the field of acrylonitrile production, in particular to a water-soluble dispersed scale inhibitor used in acrylonitrile production equipment (such as a recovery tower and a four-effect evaporation system) and an application thereof. Background technique [0002] Acrylonitrile (AN) is an important monomer in the organic synthesis industry. 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. During production and processing, due to the occurrence of acrylonitrile polymerization, on the one hand, the product yield decreases; on the other hand, the polymer deposits in the system, causing blockage of heat exchangers, trays and process pipes. [0003] At present, problems such as blockage of the aftercooler of the acrylonitrile reactor, fouling of the recovery tower tray and reboiler, and more...

AI Technical Summary

Problems solved by technology

During the production process, due to the occurrence of acrylonitrile polymerization, on the one hand, the product yield decreases; on the other hand, the polymer deposits in the system, causing blockage of heat exchangers, trays and process pipes

[0003] At present, problems such as blockage of the aftercooler of the acrylonitrile reactor, fouling of the recovery tower tray and reboiler, and more polymers in the four-effect evaporation unit are the main factors 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

[0004] Hydroquinone is usually used as a polymerization inhibitor in acrylonitrile production equipment. Although this polymerization inhibitor has a certain polymerization inhibitory effect, its efficiency is low, and it cannot effectively prevent the occurrence of polymerization, which greatly shortens the operation period of the equipment.

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