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Method for reducing metal ion concentration in brain solution

A brine solution and brine technology, applied in the direction of separation methods, alkali metal compounds, alkali metal halides, etc., can solve problems such as reducing the concentration

Inactive Publication Date: 2002-01-16
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods addresses the problem of reducing the concentration of multivalent metal ions in brine solutions derived from the polycondensate production process and containing water-soluble metal chelating agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] A saline solution derived from the polycarbonate manufacturing process and containing about 300 ppm sodium gluconate had the following polyvalent metal cation concentrations: about 3.1 ppm calcium, about 1.5 ppm magnesium and about 1.9 ppm iron. The pH of the brine solution was adjusted to above 10 with sodium hydroxide and exposed to about 10 g / l sodium carbonate. After filtering the precipitated solids, the recovered brine solution contained the following polyvalent metal cation concentrations: about 1.2 ppm calcium, about 0.03 ppm magnesium and about 0.6 ppm iron. Example 2

example 2

[0043] Take the Rohm and Haas Duolite  C467 resin, made into a column with a chelating ion exchange resin with aminophosphonic acid functionalities. A brine containing approximately 250 ppm sodium gluconate and 10-13.2 ppm iron was passed through the column at a feed pH of 2.5 at a rate of 8 resin bed volumes per hour. The iron removal efficiency was at least 99.4% (10-13.2 ppm inlet; <0.06 ppm outlet) and the iron breakthrough point occurred at 120 hours when the outlet iron concentration exceeded about 0.06 ppm. Example 3

example 3

[0044] This example illustrates the effect of feed pH on iron removal efficiency. The procedure of Example 2 was repeated except that the brine solution contained about 0.29 ppm iron and 300 ppm sodium gluconate, the feed pH was 10-11, and a resin bed volume rate of 8 per hour was passed through the column. The iron removal efficiency is generally 41% (0.29ppm inlet; 0.17ppm outlet), and the iron breakthrough point (where no more iron is complexed by the resin) occurs at 32 hours. Example 4

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PUM

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Abstract

The method reduces the concentration of multivalent metal cations such as calcium, magnesium, iron, nickel, and chromium in brine solution containing a water-soluble metal chelating agent such as sodium gluconate. The method comprises subjecting the brine to primary brine treatment, and then readjusting the brine solution to a pH ranging from about 1.5 to about 5.5, and contacting the brine solution with at least one resin bed comprising a chelating ion exchange resin, typically at a temperature ranging from about 10 DEG C to about 90 DEG C and at a flow rate ranging from about 4 to about 32 resin bed volumes per hour; and recovering the brine solution.

Description

Background of the invention [0001] The present invention relates to a method for reducing the concentration of polyvalent metal cations in aqueous brine solutions containing metal chelating agents. In particular, the present invention relates to a method for reducing the concentration of metal ions, such as iron, chromium and nickel ions, in brine solutions containing water-soluble metal chelating agents, such as sodium gluconate, from the polycondensate manufacturing process. [0002] The manufacture of polycondensates often produces brine solutions as a by-product. For example, saline solutions are produced in the manufacture of polycarbonate resins from the reaction of phosgene and at least one bisphenol compound in an organic solvent in the presence of aqueous sodium hydroxide. A common example is the reaction of bisphenol A and phosgene in dichloromethane in the presence of aqueous sodium hydroxide to produce a bisphenol A polycarbonate and sodium chloride solution. [...

Claims

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Application Information

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IPC IPC(8): B01D19/00C01D3/14C02F1/20C02F1/28C02F1/42C02F1/58C02F1/62C02F1/64C02F9/00C25B15/08
CPCC01D3/145C01D3/14
Inventor J·M·斯尔瓦
Owner SABIC INNOVATIVE PLASTICS IP BV
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