An environment-friendly crude oil decalcifier

Abstract

The invention discloses an environment-friendly crude oil decalcifying agent. The decalcifying agent is an uniform transparent mixture with the solid content being 20-40 wt.% formed by mixing water and an organic compound at the room temperature. The organic compound is formed by mixing 30-50 wt.% of a chelating agent, 5-20 wt. / % of organic acid, 5-20 wt.% of a dispersing agent and 10-30 wt.% of a neutralizing agent at the room temperature. The prepared environment-friendly crude oil decalcifying agent is applicable to crude oil with the middle and high calcium content, calcium in crude oil can be effectively removed, and the decalcifying agent contains no phosphate and is environmentally friendly.

Description

technical field [0001] The invention relates to an environment-friendly crude oil decalcifier, belonging to the field of petroleum processing, and is a phosphorus-free and environment-friendly crude oil decalcifier suitable for removing metal elements such as calcium and iron in medium-high calcium crude oil. Background technique [0002] At present, the development of many domestic oil fields has gradually entered the middle and late stages, and the crude oil is becoming more and more heavy, which makes the metal content in the output crude oil higher and higher. The representative metal components are calcium and iron. with Ca 2+ For example, the mass fraction of calcium ions in Liaohe heavy oil has reached 348 μg / g; foreign Sudan Fula-North-3 oil Ca 2+ The mass fraction is astonishingly 1990μg / g, which makes the decalcification of crude oil very necessary. [0003] Calcium in crude oil is divided into two categories: inorganic calcium and organic calcium. Inorganic cal...

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Problems solved by technology

Chemical chelation, such as the methods disclosed in Chinese patents CN1076473, CN87105863, and CN10366981, this type of method uses aminocarboxylic acids, dicarboxylic acids, hydroxycarboxylic acids and their salts that can generate water-soluble chelates with Ca to carry out crude oil decalcification Chemical acid treatment method, such as the method disclosed in Chinese patents CN1055552, CN1454967, CN1267707, CN1521239, utilizes the principle of strong acid hydrogen ions in organic or inorganic medium strong acid and calcium petroleum acid in crude oil to be replaced by weak acid, and calcium petroleum acid is reduced to petroleum The disadvantage is that strong acid will seriously corrode the equipment, and at the same time, it has the disadvantages of large pungent odor, poor adaptability to crude oil, and large amount of decalcifying agent; chemical precipitation decalcification, such as Chinese patents CN1120575, CN1054261 , the disclosed method of CN1760338, this type of method adopts the calcium petroleum acid in water-soluble sulfate, phosphate and crude oil to react to generate slightly soluble or water-insoluble calcium sulfate, calcium phosphate precipitate, under the effect of surfactant, deposition The purpose of decalcification is achieved in the water phase. The disadvantage of this method is firstly that the phosphate decalcification agent contains phosphorus, which will cause water pollution and have a great impact on the environment. Secondly, the removal rate of calcium is not high, and the resulting sediment It is easy to block the equipment pipeline, and the industrial waste generated at the same time needs to be treated

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