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

An oilfield water, calcium chloride technology, applied in chemical instruments and methods, oxidized water/sewage treatment, bromine/hydrogen bromide, etc., can solve the problems of reducing the extraction rate of bromine, increasing the production cost of extracting bromine, etc., and achieving convenient operation. , The effect of reducing the cost of bromine extraction and high yield

Inactive Publication Date: 2011-05-25
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the extraction rate of bromine is reduced, which increases the production cost of bromine extraction

Method used

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

Examples

Experimental program
Comparison scheme
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 concentrated in the sun, and acidify to pH=2.0 at room temperature.

[0046] The amount of hydrochloric acid added is: 1.6L of industrial concentrated hydrochloric acid is added to the oilfield water after sun exposure and concentration per cubic meter.

[0047] (2) Oxidation treatment: The acidified oilfield water is oxidized with sodium hypochlorite as an oxidant, so that the bromide ion in the oilfield water is converted into elemental bromine. The amount of sodium hypochlorite added is 30L of sodium hypochlorite per cubic meter of concentrated oilfield water; the available chlorine in the sodium hypochlorite is ≥10%. Control the oxidation potential at 1000 ~ 1016mv. The oxidation rate was 95.6%.

[0048] (3) Air blowing bromine: the acidified and oxidized oil field water is sent to the air blowing tower, the free elemental bromine in the solution is blown out by air convection, and the temper...

Embodiment 3

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

[0055] The amount of hydrochloric acid added is: 2.1L of industrial concentrated hydrochloric acid is added to the oilfield water after sun exposure and concentration per cubic meter.

[0056] (2) Oxidation treatment: The acidified oilfield water is oxidized with sodium hypochlorite as an oxidant, so that the bromide ion in the oilfield water is converted into elemental bromine. The amount of sodium hypochlorite added is 25L of sodium hypochlorite per cubic meter of concentrated oilfield water; the available chlorine in the sodium hypochlorite is ≥10%. Control the oxidation potential at 1000 ~ 1016mv. The oxidation rate was 97.3%.

[0057] (3) Air blowing bromine: the acidified and oxidized oil field water is sent to the air blowing tower, the free elemental bromine in the solution is blown out by air convection, and the temper...

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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

technical field [0001] The invention belongs to the technical field of inorganic salt chemical industry, and relates to a method for extracting bromine from calcium chloride-type oil field water, in particular to a method for extracting bromine from calcium chloride-type oil field water by air blowing. Background technique [0002] Bromine is an active halogen element. So far, no solid minerals containing bromine have been seen in nature, but it mainly occurs in ocean water, underground brine in oil and gas fields, and brine in salt lakes. The raw material for bromine production in my country is mainly concentrated brine after salt production. [0003] The methods for producing bromine from brine mainly include steam distillation, air blowing, resin exchange, solvent extraction, precipitation, and membrane. The main industrial production methods are air blowing method and steam distillation method. The steam distillation method uses bittern to prepare potassium chloride as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/09C02F9/04C02F1/66C02F1/76C02F1/20
Inventor 张志宏李武张永德马艳芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI