Process and apparatus for the production of calcium bromide by liquid-liquid extraction

A production method and technology of calcium bromide are applied in directions such as magnesium bromide, calcium/strontium/barium bromide, magnesium chloride, etc., and can solve problems such as not considering problems

Inactive Publication Date: 2004-08-18
BROMINE COMPOUNDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the references actually describe laboratory experiments rather than industrially valid methods and do not take into account problems that arise in industrial operations

Method used

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  • Process and apparatus for the production of calcium bromide by liquid-liquid extraction
  • Process and apparatus for the production of calcium bromide by liquid-liquid extraction
  • Process and apparatus for the production of calcium bromide by liquid-liquid extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The following is based on figure 1 Representative results of the summer run (August) of the process flow diagram. The obtained parameters are as follows:

[0078] Brine composition: 0.90% Br - , 26.2% Cl - .

[0079] Flow rate: raw brine 43m 3 / hr, solvent 85m 3 / hr, washing water 3.6m 3 / hr.

[0080] Yield: 1110 1t / hr of 18.5% CaBr 2(490kg 52% CaBr 2 , 0.7% Cl in this 52% product - ).

[0081] Br - Extraction rate: 37%.

[0082] Representative concentration:

[0083] Depleted brine: 0.53% Br - , 24.4% Cl - .

[0084] Extract: 1.2% Br - , 1.2% Cl - .

[0085] Washed Solvent 0.03% Br 2 .

[0086] Percentages here and thereafter are by weight unless otherwise indicated.

[0087] liquid flow

Embodiment 2

[0089] liquid flow

Embodiment 3

[0091] This example refers to a summer operation (temperature 50° C.) carried out in an intermediate plant consisting of a nine-stage mixer-clarifier, where 45 l / h of specific Dead Sea brine meets 85 l / h of washed solvent. The extract was washed with 6 l / h of distilled water without any purification. Stage five is used for extraction and stage four is used for washing.

[0092] The introduced brine contained 26.7 wt% Cl, 0.92 wt% Br and 4.08 wt% Ca ++ and 6.8 wt% Mg ++ . The product has 5.2 wt% Br - and 17.1 wt% Cl - . 85% by weight of Br in the raw brine - is extracted.

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Abstract

A process for the production of calcium bromide from feed brines, particularly from Dead Sea End Brine (EB), is described. The process comprises extracting the feed brine in countercurrent with a composite organic solvent; optionally, purifying the extract to increase the ratio Br:Cl by contacting it with a part of the product; and washing the purified extract with water to yield the product, that is an aqueous solution of CaBr2. The composite solvent comprises an anionic extractant, such as an amine or a mixture of amines; a cationic extractant, such as a carboxylic phosphoric or sulphonic acid or a mixtures of said acids; and diluent / modifier, which is an organic solvent. An apparatus for the production of calcium bromide is also described, which comprises: an extraction battery; optionally, a purification battery; and a washing battery, wherein at least one of the batteries comprises a plurality of stages.

Description

field of invention [0001] The present invention relates to the production of CaBr from brines containing it 2 (Calcium bromide) solution, especially from specific Dead Sea brine (hereinafter denoted EB). Background of the invention [0002] The term "brine" here means a concentrated saline solution of sodium chloride and other salts. Concentrated solutions without sodium chloride are not referred to herein as "brines", although the literature sometimes refers to them as such. Specific Dead Sea brine (hereinafter simply "EB") is the brine remaining after the final concentration stage in the process of producing carnallite from Dead Sea water. It contains 20-27 wt% Cl - , 0.75-0.95% by weight Br - , 2-5% by weight Ca ++ and 5-7 wt% Mg ++ . A solution of any of the above-mentioned salts, regardless of its origin, provided that the concentration of the salt is substantially within the above-mentioned range, is a brine included in this application, and what is hereinafter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C01F5/36C01F11/24
CPCC01F11/24C01F5/36C01F5/30
Inventor B·格林鲍姆L·科根E·巴恩亚G·哈雷尔R·塞米亚特S·瓦赫曼恩
Owner BROMINE COMPOUNDS
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