Method for synergistically extracting bromine and lithium from brine of oil and gas field

By employing a synergistic approach of deep impurity removal, electro-oxidation for bromine extraction, and alkaline extraction for lithium extraction, the problems of electrode scaling and extractant poisoning in the extraction of lithium bromide from oil and gas field brine have been solved. This approach has enabled efficient and stable recovery of lithium bromide and high-purity lithium products, improving process compatibility and recovery rate.

CN122233580APending Publication Date: 2026-06-19ZHEJIANG HONGCHENG ENVIRONMENTAL PROTECTION EQUIPMENT CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202610415618.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-31
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies for extracting bromine and lithium from oil and gas field brines suffer from problems such as electrode scaling, extractant poisoning, poor process compatibility, and low recovery rates. They also lack synergistic design, and in particular, calcium and magnesium ion interference is severe, affecting the electro-oxidation and alkaline extraction processes.

Method used

A synergistic approach combining deep impurity removal, electro-oxidation for bromine extraction, and alkaline extraction for lithium extraction is employed. This approach utilizes multi-branched alkyl-substituted naphthenic acid derivatives as the main extractant and incorporates a steric hindrance modifier to construct a precise steric hindrance effect extraction environment. This is combined with three-stage adaptive potential control and multi-stage countercurrent extraction.

Benefits of technology

It achieves efficient recovery of bromine and lithium, extends electrode cleaning cycle, improves extractant stability, and produces high-purity lithium products, meeting the needs of high-end applications, adapting to different brine qualities in oil and gas fields, and significantly improving the selectivity of lithium-sodium separation.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a three-stage coupling enhanced recovery method aiming at the problems of electrode scaling, extraction agent poisoning, process mismatching and the like in the recovery process of bromine and lithium resources in oil and gas field brine. The method comprises the following steps: firstly, reducing calcium ions in the brine to below 5mg / L and magnesium ions to below 2mg / L through a deep impurity removal step; then carrying out electrooxidation bromine extraction under an acidic condition, and recovering a bromine product; and finally, adjusting the alkali of the debrominated tail water until the pH value is 10-13, and extracting lithium by adopting a synergistic extraction system containing a multi-branched alkyl substituted naphthenic acid derivative and a steric configuration regulating agent. Good conditions are created for subsequent electrooxidation and extraction through deep impurity removal, high-selectivity separation of lithium is achieved through a structured extraction system under the alkaline condition, the electrode cleaning period and the service life of an extraction agent are remarkably prolonged, and the product purity is improved. The method provided by the invention realizes high-efficiency synergistic recovery of bromine and lithium, and has a good industrial application prospect.
Need to check novelty before this filing date? Find Prior Art