A kind of water-soluble dispersed scale inhibitor and its application

Abstract

The invention discloses a water soluble dispersion scale inhibitor and an application thereof in a production device of acrylonitrile. The water soluble dispersion scale inhibitor comprises a component A and a component B, wherein the component A is a polymer of imide and / or amide, the component B is one or more of p-tert-butylcatechol, N, N-diethylhydroxylamine and N-isopropylhydroxylamine, and the mass ratio of the component A to the component B is (10-50): (1-10). With the adoption of the water soluble dispersion scale inhibitor, polymerization of radicals can be effectively inhibited, formed scale can be dispersed to be evenly dispersed in an aqueous phase, and accordingly, the scale is prevented from being separated out of the production device of acrylonitrile, and the production 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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