Hydrogenation treatment method for high-acid hydrocarbon oil

Abstract

The invention discloses a hydrogenation treatment method for high-acid crude oil, which is characterized in that the high-acid crude oil is conveyed to a fixed bed reactor with heat accumulation bodies after being mixed with hydrogen gas for hydrogenation reaction, and reaction products flow out of the reactor to obtain products with qualified acid values. When the operation is started, a hot mixture of clean oil and hydrogen gas is firstly introduced for heating the heat accumulation bodies, after the heat accumulation bodies reach the reaction temperature, the materials are switched into acid-containing crude oil, reaction effluents accumulate heat for the other heat accumulation body, and the two heat accumulation bodies are alternately switched for being used. The method has the advantages that the heat released by high-acid crude oil hydrogenation and the accumulated heat of the heat accumulation bodies can be used for maintaining the temperature required by the hydrogenation reaction, an external heat source is not needed, a heating furnace is omitted, the corrosion of the high-acid crude oil on high-temperature equipment is avoided, the equipment investment and the operation cost are saved, and simultaneously, the heat sources are also reasonably utilized.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of high-acid hydrocarbon oil, in particular to a method for hydrogenation treatment of fixed-bed high-acid hydrocarbon oil. Background technique [0002] Petroleum usually contains acid compounds, mainly in the form of naphthenic acid. The concentration or content of acid is generally expressed by total acid value. The total acid value refers to the number of milligrams of potassium hydroxide (KON) required to neutralize all acidic components of 1 gram of crude oil or petroleum fractions, and the unit is mgKOH / g. Generally, when the acid value in crude oil exceeds 0.5mgKOH / g, the crude oil will cause corrosion during processing. The corrosion of naphthenic acid has a great relationship with temperature. Before 220℃, there is almost no corrosion effect. As the temperature increases, the corrosion effect of naphthenic acid gradually increases. In terms of temperature, 225-320°C is the tempe...

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Problems solved by technology

[0004] There are many ways to remove acidic substances in crude oil. One method is to neutralize the acidic components in petroleum with various alkaline compounds, but the soap formed by the reaction of petroleum carboxylic acid and alkali can emulsify viscous crude oil and give crude oil The desalting and dehydration of the acid will cause difficulties, which will increase the salt content in the crude oil after deacidification, which will affect the subsequent processing of crude oil

Another way is to use corrosion-resistant metal materials in high-temperature refining equipment, but these materials are more expensive and increase the cost of refining

The third way is to add corrosion inhibitor to crude oil, but the corrosion inhibitor will affect the subsequent processing and reduce the activity and life of the catalyst

It will eventually cause damage to equipment, increase the accident rate and affect safe production, and will increase the number of shutdowns and maintenance costs

If the reaction is carried out below 200°C, although strong corrosion can be avoided, the reaction temperature is too low and the reaction rate is slow, which is not conducive to the deacidification reaction, the deacidification efficiency is reduced, the product is unqualified, and the subsequent processing process still exists. acid corrosion problem

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