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Compound crude oil decalcifying agent

A crude oil decalcifying agent and composite technology, applied in the petroleum industry, treating hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problems of increased conductivity of crude oil, increased power consumption, corrosion of heat exchange equipment, etc., to reduce interfacial tension, Increase the probability of contact and reduce the effect of corrosion

Inactive Publication Date: 2017-09-19
LUOYANG RONGHUI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Calcium is very harmful to the petroleum refining process, mainly manifested in: (1) leading to catalyst deactivation and equipment fouling used in crude oil processing, affecting the smooth operation of production equipment, reducing product quality and crude oil processing efficiency
(2) Harm to the electric desalination system: Excessive calcium content increases the conductivity of crude oil, increases the desalination current, and increases power consumption, which is not conducive to the desalination / dehydration of the electric desalination device
(3) Corrosion of the condensation system at the top of the atmospheric and vacuum unit, corrosion of heat exchange equipment and corrosion of high temperature combustion equipment
Chinese patents CN102485838A, CN 105062548 A, and CN1657594A all disclose a crude oil decalcification agent, but they are all experimentally verified on a static electric desalting device, and the decalcification effect of the static electric desalting device is greatly different from that of the dynamic electric desalting device. The difference in decalcification rate is significantly higher than that of dynamic electric desalination process; patent CN105733664A introduces a crude oil electric desalination and decalcification process, which is an experiment done on a dynamic electric desalination device, but there are few introductions to decalcification agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First configure the composite crude oil decalcifying agent of the present invention, the mass percent of each component is as follows: 60% of 1-hydroxypropylidene-1,1-diphosphonic acid, 30% of acetic acid, 2% of polypropylene Amide, 2% benzotriazole and 6% NS-9906 are mixed evenly, and then prepared into a 1.8% aqueous solution with desalinated water; the calcium content of the mixed oil A before removal is 256 μg / g.

[0019] Mixed oil A is heated to 80-90°C in the raw material tank, accurately metered by the raw material pump, and then transported to the preheating furnace to heat up to 130-140°C. Mixed oil A, equivalent to 6% of crude oil mass percentage, washing water, equivalent to The demulsifier with a crude oil quality of 15-30 μg / g, which is equivalent to a crude oil quality of 512 μg / g (the mass ratio of decalcifying agent to calcium in crude oil is 2:1), is sent to the first-stage static mixer together, and passes through the first-stage static mixer. After fu...

Embodiment 2

[0021] The mass percentage of the decalcifying agent is as follows: 65% of 1-hydroxypropylidene-1,1-diphosphonic acid, 30% of acetic acid, 0.5% of polyacrylamide, 0.5% of benzotriazole and 4% of NS -9906 mixed evenly, and then configured into a 2% aqueous solution with desalinated water; the calcium content of the mixed oil B before descaling was 243 μg / g, and the amount of decalcifying agent added was equivalent to 486 μg / g of crude oil (the ratio of decalcifying agent to calcium in crude oil The mass ratio is 2:1), and other conditions are the same as in Example 1. After secondary desalting, the decalcification rate of crude oil after desalination is shown in Table 1.

Embodiment 3

[0023] The mass percentage of the decalcifying agent is as follows: 1% of 1-hydroxypropylidene-1,1-diphosphonic acid, 19% of acetic acid, 1% of polyacrylamide+1% of hydroxypropyl acrylate, 2% of benzotri Mix azoles and 6% NS-9906 evenly, and then use desalinated water to prepare an 8% aqueous solution; the calcium content of the mixed oil C before removal is 1538 μg / g. The amount of decalcifying agent added is equivalent to 6152 μg / g of crude oil (the mass ratio of calcium decalcifying agent to crude oil is 4:1), and other conditions are the same as in Example 1. After two-stage desalination, the decalcification of crude oil Rates are shown in Table 1.

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PUM

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Abstract

The invention relates to a compound crude oil decalcifying agent. The compound crude oil decalcifying agent is prepared from, in percentage by mass, 90%-95% of a chelating agent, 0.5%-2% of a surfactant, 0.5%-2% of a corrosion inhibitor and 4%-6% of a demulsifier through mixing. The compound crude oil decalcifying agent is mainly used for decalcification and magnesium removal of high-acid heavy-viscous crude oil. The components have good compatibility, have little corrosion to equipment and can be easily mixed with the heavy-viscous crude oil, and the de-calcification rate can reach 80% or above.

Description

technical field [0001] The invention belongs to the technical field of crude oil pretreatment, and mainly relates to a composite crude oil decalcifying agent. Background technique [0002] With the continuous heaviness and inferiority of crude oil, the calcium content in crude oil has an obvious upward trend. Calcium in crude oil is divided into two categories: inorganic calcium and organic calcium. Inorganic calcium exists in the form of calcium chloride, calcium carbonate, calcium sulfate, etc.; Most of them exist in the form of organic calcium such as oil-soluble calcium naphthenate, calcium phenate, and fatty acid calcium. [0003] Calcium is very harmful to the petroleum refining process, mainly in the following aspects: (1) It leads to catalyst deactivation and equipment fouling used in crude oil processing, affects the smooth operation of production equipment, and reduces product quality and crude oil processing efficiency. (2) Harm to the electric desalination syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G29/20
CPCC10G29/20C10G2300/1033C10G2300/205
Inventor 王晓丽李昕
Owner LUOYANG RONGHUI CHEM TECH CO LTD