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Method for extracting bromine from chloride-calcium type oil field water

A technology of oilfield water and calcium chloride, which is applied in chemical instruments and methods, oxidized water/sewage treatment, bromine/hydrogen bromide, etc., can solve the problems of increasing the production cost of bromine extraction, reducing the extraction rate of bromine, etc. The effect of bromine cost, convenient operation and simple process

Inactive Publication Date: 2009-12-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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AI Technical Summary

Benefits of technology

This patented technology allows for efficient production of bioremediation agents that can be used on various types of oily wastewater such as seafood or other organic matter containing heavy metals like lead (Pb)

Problems solved by technology

The technical problem addressed in this patented text relates to improving the efficiency and effectiveness of biodiesel manufacturing processes through various techniques like air injection and vacuum evaporation. Specifically, there currently exist challenges related to efficiently separating bromoic acids during processing of crude oils derived from these sources without generating excessive waste streams.

Method used

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  • Method for extracting bromine from chloride-calcium type oil field water

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Effect test

Embodiment 1

[0036] (1) Acidification treatment: add hydrochloric acid to the oilfield water after sun drying and concentration, and acidify to PH=0.1 at room temperature.

[0037] The amount of hydrochloric acid added is: add 3.0L of industrial concentrated hydrochloric acid per cubic meter of sun-dried and concentrated oilfield water.

[0038] (2) Oxidation treatment: Sodium hypochlorite is used as an oxidant to oxidize acidified oilfield water to convert bromide ions in oilfield water into elemental bromine. The amount of sodium hypochlorite added is to add 20.0L of sodium hypochlorite per cubic meter of concentrated oilfield water; the available chlorine in the sodium hypochlorite is more than or equal to 10%. Control the oxidation potential at 1000-1016mv. The oxidation rate was 93.7%.

[0039] (3) Air blowing out of bromine: the acidified and oxidized oilfield water is sent into the air blowing tower, and the free elemental bromine in the solution is blown out by air convection. C...

Embodiment 2

[0045] (1) Acidification treatment: add hydrochloric acid to the oilfield water after sun drying and concentration, and acidify to pH=2.0 at room temperature.

[0046] The amount of hydrochloric acid added is: add 1.6L of industrial concentrated hydrochloric acid per cubic meter of sun-dried and concentrated oilfield water.

[0047] (2) Oxidation treatment: Sodium hypochlorite is used as an oxidant to oxidize acidified oilfield water to convert bromide ions in oilfield water into elemental bromine. The amount of sodium hypochlorite added is to add 30L of sodium hypochlorite per cubic meter of concentrated oil field water; the available chlorine in the sodium hypochlorite is more than or equal to 10%. Control the oxidation potential at 1000-1016mv. The oxidation rate was 95.6%.

[0048] (3) Air blowing out bromine: Send the acidified and oxidized oilfield water into the air blowing tower, use air convection to blow out the free elemental bromine in the solution, control the t...

Embodiment 3

[0054] (1) Acidification treatment: add hydrochloric acid to the oilfield water after sun drying and concentration, and acidify to pH=0.8 at room temperature.

[0055] The amount of hydrochloric acid added is: add 2.1L of industrial concentrated hydrochloric acid per cubic meter of sun-dried and concentrated oilfield water.

[0056] (2) Oxidation treatment: Sodium hypochlorite is used as an oxidant to oxidize acidified oilfield water to convert bromide ions in oilfield water into elemental bromine. The amount of sodium hypochlorite added is to add 25L of sodium hypochlorite per cubic meter of concentrated oil field water; the available chlorine in the sodium hypochlorite is more than or equal to 10%. Control the oxidation potential at 1000-1016mv. The oxidation rate was 97.3%.

[0057] (3) Air blowing out bromine: send the acidified and oxidized oil field water into the air blowing tower, use air convection to blow out the free elemental bromine in the solution, control the ...

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Abstract

The invention provides a method for extracting bromine from chloride-calcium type oil field water. The method comprises the following steps: taking concentrated solution of the chloride-calcium type oil field water after naturally solarization in a salt field as stock solution; acidifying and oxidizing the chloride-calcium type oil field water to transform free bromine ions into elementary bromine; then blowing the elementary bromine out by an air blowing process and absorbing the elementary bromine by alkali liquor or sodium sulfite solution; acidifying and oxidizing absorption liquid, then separating the absorption liquid by a wet distillation method to obtain liquid bromine, and filtering the liquid bromine to obtain a bromine product. Purity of the bromine is 97.6-99.0% and yield of the bromine is 89.5-95.5%. The method helps overcome the disadvantages of low bromine extraction rate in the prior art, is a new method found for extracting the bromine from the oil field water containing a large amount of NH4<+> and achieves high bromine yield and high purity bromine product.

Description

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Claims

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Application Information

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Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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