Ammonium salt dispersing agent for refinery fractionation device as well as preparation method and application of ammonium salt dispersing agent

Abstract

The invention relates to the field of ammonium salt dispersing agents, in particular to an ammonium salt dispersing agent for a refinery fractionation device, a preparation method and application thereof. The ammonium salt dispersing agent comprises the following components in percentage by mass: 30-50% of a purification dispersing agent, 3-5% of a phase transfer agent, 10-15% of a gas phase interfacial agent, 3-6% of a passivating agent, 3-5% of organic amine, 5-8% of ethylene oxide modified imidazoline and the balance of solvent oil. The ammonium salt dispersing agent provided by the invention is mixed and dissolved with oil gas, can decompose ammonium salts such as NH4Cl formed on a tower tray, equipment, a pipeline and the like of a fractionation device into gas, enables the gas to be discharged from the tower top along with condensed water, thoroughly removes salt scale in the tower and the like, and can form a layer of gas phase interface film on the surface of the gas while decomposing the ammonium salts to prevent re-combination of the gas so as to improve the separation efficiency of the gas. The formation of ammonium salts such as NH4Cl and NH4HS is effectively inhibited, and the problem of under-scale corrosion of the ammonium salts is fundamentally solved. And the use amount is 5-20 ppm, the ammonium salt dispersion and inhibition performance reaches 90% or above, fluctuation is not generated in device operation, and stable and long-period safe operation of a device is guaranteed.

Description

technical field [0001] The invention relates to an ammonium salt dispersant used in refinery fractionation units, a preparation method and application thereof, and is mainly used in anticorrosion technology of refinery fractionation units. Background technique [0002] With the deterioration and deep exploitation of crude oil, and the further application of oil recovery additives in the process of crude oil extraction, the proportion of high-acid, high-sulfur, high-nitrogen heavy crude oil processed by refineries is getting higher and higher, resulting in refinery equipment including towers The problem of ammonium salt scaling and corrosion of plates, pipelines, etc. is becoming more and more serious. During the processing of raw materials in refineries, elements containing chlorine, nitrogen and sulfur will be converted into NH 4 Cl, NH 4 HS, these ammonium salt scale substances that are easy to scale, not only make the production impossible, but also adhere to the metal ...

AI Technical Summary

Problems solved by technology

At present, refineries generally use water washing to remove salt scale, but there are the following problems: (1) The operation fluctuates greatly during water washing, which will cause the circulating oil pump at the top of the tower to vacuum, which cannot fundamentally solve the problem of salt accumulation

(2) Washing consumes a lot of energy and produces a lot of sewage

(3) Ammonium salt is easy to harden at high temperature, it is not easy to completely remove, and the interval between secondary washing is short

However, there are still some deficiencies in this type of product: the initial effect of use is relatively obvious, but because it can only transfer NH 4 The crystallization position of salts such as Cl, instead of converting them into oil-soluble substances and taking them away with the stream, the effect of preventing salt in the later stage is getting worse; for the formed NH 4 Cl, NH 4 The removal effect of HS scale is poor or ineffective, and it cannot effectively inhibit the under-deposit corrosion of ammonium salts, etc.

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