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A method for recycling crude oil decalcification discharge liquid by complexation method

A technology of discharging liquid and complex method, which is applied in the petroleum industry, processing hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problem of no removal effect, etc., and achieve good application prospects, reduced processing costs, and good economic benefits.

Active Publication Date: 2017-01-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For soluble salts and hydrophilic inorganic calcium salt particles, refineries usually use simple water washing to remove them during the electric desalination process, but for calcium petroleum acid existing in the oil phase, this method has almost no removal effect, this part The presence of calcium salts will have many negative effects on subsequent crude oil processing

Method used

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  • A method for recycling crude oil decalcification discharge liquid by complexation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 1 ton of electric desalination water from ammonium citrate crude oil decalcification, measure the calcium ion content in the water of 936ug / g, add 2.09kg of ammonium carbonate to the water, mix well, let it stand for 16 hours, and measure the calcium ion in the supernatant Content is 105ug / g, and ammonium citrate content is 3610ug / g, takes 900 kilograms of supernatant, adds ammonium citrate 1251g in this supernatant, reaches the decalcification agent injection concentration that ammonium citrate content is 5000ug / g Requirements, this liquid is the decalcifying agent required by the process, which can decalcify the crude oil and complete the recycling of the decalcified discharge liquid.

Embodiment 2

[0016] as attached figure 1 In the process shown in the figure, 1 is an electric desalination tank, 2 is a mixer, and 3 is a two-stage hydrocyclone. The flow rate of electric desalination water is 10 tons / hour, and the calcium ion content in the water is measured to be 1060ug / g. The flow rate of 10% diammonium hydrogen phosphate aqueous solution entering the mixer is 332.3kg / hour, and a precipitation reaction occurs in the mixer. The material enters the two-stage hydrocyclone, the calcium slag obtained at the bottom of the hydrocyclone is discarded, and the separated supernatant flows out from the second-stage hydrocyclone. The flow rate is 9.6 tons / hour, and the calcium ion content in the supernatant is 120ug / g, the content of ammonium citrate is 4238ug / g, inject 10% ammonium citrate decalcification agent replenishment liquid in this supernatant liquid pipeline, flow control is at 73.15kg / hour, now decalcification agent recycles the lemon of pipeline The ammonium acid cont...

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Abstract

The invention relates to a cyclic utilization method of complexation-method crude-oil decalcified discharge liquid. The method comprises the following steps: reacting waste water produced after decalcification between ammonium citrate and crude oil with an ammonium salt solution of a strong precipitant; separating calcium precipitant produced in reaction liquid; mixing the separated clear liquid with a supplementary fresh decalcifying agent to be used as the decalcifying agent for renewed cyclic utilization; abandoning the separated solid residues or further separating and utilizing, wherein the ammonium salt of the strong precipitant is selected from ammonium carbonate, ammonium phosphate or diammonium hydrogen phosphate; the input mass of the ammonium salt of the strong precipitant is 90-99 percent of the mass of calcium precipitant which is produced through theoretically complete reaction. According to the cyclic utilization method of the complexation-method crude-oil decalcified discharge liquid, the production cost of an ammonium citrate crude oil decalcifying process can be effectively reduced, and the processing cost of decalcified waste water is greatly reduced; moreover, the cyclic utilization method has a good economic benefit, can be combined with a crude oil electro-desalting process of a refinery plant, can be applied to industrial decalcifying continuous production of calcium-containing crude oil, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, and more specifically, relates to the recycling of crude oil decalcification discharge liquid of complexation process in crude oil processing technology. Background technique [0002] Part of the metallic calcium in crude oil exists in the form of water-soluble salts and slightly soluble salts such as calcium chloride, calcium sulfate and other inorganic calcium salts, and the other part exists in the form of organic calcium salts such as calcium petroleum acid. For soluble salts and hydrophilic inorganic calcium salt particles, refineries usually use simple water washing to remove them during the electric desalination process, but for calcium petroleum acid existing in the oil phase, this method has almost no removal effect, this part The presence of calcium salts will have many negative effects on subsequent crude oil processing. [0003] The chelation decalcification method, al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G29/20
CPCC10G29/20C10G2300/202C10G2300/80
Inventor 刘江华艾立江陈晓东
Owner PETROCHINA CO LTD