CZ46994A3 - Method of prolonging service life of electrolyte by eliminating organic impurities - Google Patents

Description

Method of extending the life of an electrolyte by eliminating organic pollutants mot

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WHAT IS IT EXTENDED?

It has been found that the semiconductor is primarily an operating technique where chemical autocatalytic and galvanic working solutions are preferably used in gastronomy solutions for coating metals, non-conductive impurity substrates.

and conductive plates by eliminating organic

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Electrolyte solutions containing heavy metals are used in the production of galvanic metal coatings and metal foils. to which they can achieve special surface properties, such as gloss. ductility, tensile strength and the like, to add selected organic compounds. These organic substances are subject to chemical changes during the deposition process. so that impurities are produced which lead to process disturbances in the lossless production line, the production-dependent electrolyte line. Enrichment of solution in the production electrolyte of impurities.

organic necismors of man can be set ^- lanesenrm

They consist in adsorption of hydrogen, eventually re:

Removal of organic impurities

in activated carbon and in the oxidation by means of a proxide in potassium permanganate, as is apparent from 0 560. However, in this way not all the impurities of these organic impurities can be removed from the active bath.

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The disadvantages of using activated carbon are also the large ones. η heavy metal losses as well as adsorbent losses of up to 80% during regeneration. Due to the heavy metal content, the spent activated carbon is a special hardly recoverable waste.

The use of oxidizing agents in many cases even promotes enrichment of impurities.

Another variant of the process of elimination of organic impurities from the electrolyte solution for galvanizing plants is based on the creation of an inner circuit of the circulation of substances and includes the steps of precipitation of heavy metals in the rinsing water in the form of hydroxides, sedimentation of heavy metal hydroxide sludge. electrolyte solution to a galvanic production bath or to an electrolytic production.

cathodic deposition of heavy electrolytic production, anodic metals and recovery in the deposition of sulfuric acid for dissolving sludge. The organic impurities remain after the precipitation of the heavy metals and separation of the sludge in the filtrate, so that enrichment in the galvanic electrolyte can be prevented. This is described in Galvanotechnik 71, 1980, 7, pp. 718-780.

Another variant of the process is also based on the formation of an internal circuit of the circulation of substances and involves a combination with ion exchange in electrolytic deposition. In the flushing water containing the electrolyte, separation of organic materials and heavy metal wash water is achieved by ion exchange. The organic materials remain in and thereby separate from the electrolyte solution, while the heavy metal ion exchange eluate is either recycled to the electrolyte solution or treated by electrolytic deposition to the metal (Acta Hydrochim et Hydrobiol. 18 (1984) 8, 183.802). All the mentioned regeneration variants have the disadvantage that they lead to much higher substance loss and do not represent a solution to the problem in terms of production techniques with minimizing pollutants.

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The essence, I invent

It is an object of the present invention to provide a method of eliminating organic impurities from electrolyte solutions to extend their lifetime and minimize wastewater and waste. The removal of impurities must be carried out with a regenerable adsorbent polymer, while organic diluents are excluded as regenerants for the adsorbent polymers used.

SUMMARY OF THE INVENTION The object of the present invention is to provide a process for extending the life of an electrolyte solution by eliminating organic impurities with a regenerable adsorbent polymer. After the adsorption elimination of the impurities, the electrolyte solution must be unrestrictedly usable. The decisive prerequisite for the application of the method is the complete regeneration of the adsorbent polymers with an aqueous solution.

This object is solved by the teachings of the claims. Surprisingly, it has been found that by oxidative treatment of the adsorbent polymer, for example with a dilute hydrogen peroxide solution, the aasorption allows the regenerative structure to be altered accordingly. The process according to claim 1, wherein the alcohol solution is reliably linked to it in one regeneration step. for example dilute sodium hydroxide. The treatment can also occur in one step by contact with an alkaline aqueous solution of the oxidizing agent. In addition to the hydrogen peroxide solution, water-dilutable persulfate or persulfate can also be used as the oxidizing agent.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

Nickel-plated electrolyte highly contaminated with organic substances

4dirt with a nickel concentration of 95.9 g / l and a carbon concentration

85.5 g / l, which was not functional due to the high concentration of organic matter, was regenerated using an adsorbent polymer. The adsorption regeneration of the galvanic nickel electrolyte is carried out with an anasorocic polymer. in ethynylbenzene divinylbenzene copolymer. Co-ordinate procedure p

The inner diameter of the boxes was about 3 polymer was about 70 cm.

in this case, without polar groups, an outlet with a flow rate of approximately 8.5 m / h.

cm, height of adsorption layer

It has been tested diluted in water at a ratio of 1 proveaeno ri to fill undiluted electrolyte and electrolyte

5. The adsorption column load was total volumetric capacity. The total volume capacity is the amount of adsorbent polymer for all organic formed organic

Determination of the penetration substance, that is, the sum of the organic substance introduced, or any foreign organic substance introduced, expressed as carbon in grams per liter of adsorber. The total volumetric capacities are performed by evaluating the curve on condition that the load of the adsorption column remains the same, i.e. the introduced organically bound carbon is identical to the organically bound carbon withdrawn.

The following results were achieved:

when regenerating undiluted electrolyte when regenerating electrolysis diluted 57 g / l adsorber.

the total volumetric capacity was about 63 g / l adsorber the total volumetric capacity with water in the ratio of 1: 5 was

Electrolyte regeneration decreased from 85.5 g / l to 10.4 g / l.

content of organically bound carbon

The electrolyte regeneration is followed by correction of the inserted organic substance according to the company's recipe. Subsequent verification in the Hull chamber shows that the electrolyte was reusable indefinitely.

EXAMPLE 2 An adsorbent polymer having an inner diameter of 0.9 cm, a height of 16 cm, filled with an asorbent polymer of ethyl tinybenzene-divinylbenzene copolymer without polar groups.

was introduced by a dysfunctional galvanic nickel electrolyte with a nickel concentration of 78.1 g / l and an organically bound carbon concentration of 4.8 g / l. Loading takes place at the outlet with a flow rate of approximately 3.5 m / h to reach the total volume capacity.

Regeneration of the introduced adsorbent polymers occurs in the same columns according to the following regeneration scheme:

1. Countercurrent washing of the box with water,. until there is no evidence of nickel in the wash water. The piercing speed is 3 m / h.

2. Treatment of the adsorbent polymer with five volumes of its charge of hydrogen peroxide solution at runoff and in a circular choo. with a flow velocity of approximately i.7 m / h. for a maximum of i h.

Wash with water until hydrogen peroxide is not detectable in the wash water.

Treatment of the adsorption polymer with five volumes of its charge with about 6% sodium hydroxide in the outflow and in a circular run, with a flow rate of about 1.7 m / h, for a maximum of 1 h.

Wash with water until the wash water is non-alkaline. Subsequently, the adsorption polymer is recharged. The total volumetric capacity remained constant during the five cycles tested, amounting to about 16 g of carbon per liter of adsorber.

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Claims (3)

PATENTOVÉ - O 7JÍ > r-j- r ~ ” it O _ O O ÍC f> ‘ 73 CC ^r > cx I C V ‘ - r * i ₍ - WHAT O t c ·. rn. «.ÍO '* - · and ί - ~ χ) (OF A method for extending the life of electrolytes by eliminating organic impurities characterized in that. in that the electrolyte solution containing the organic impurities is contacted with the regenerable adsorbent polymer. whereupon optionally the adsorbent polymer is rinsed with water. further treating the adsorbent polymer with an aqueous solution of the oxidizing agent, optionally washing the adsorbent polymer with water, further treating the adsorbent polymer with an aqueous alkaline solution and optionally washing the adsorbent polymer with water. A method of extending the life of electrolytes by eliminating organic impurities, characterized in that a solution containing organic impurities is introduced into a regenerable adsorbent polymer, followed by contacting the electrolyte with an optionally adsorbent polymer with an adsorbent polymer of the composition, followed by water. rinsing with water, treatment with an alkaline aqueous oxidizing solution is optionally rinsed with adsorbent polymer Method according to claims 1 and 3, characterized in that the regenerate containing organic substances is treated with a redox process, for example UV radiation and an oxidizing agent. The process according to claims 1 and 3, characterized in that the alkaline aqueous solution is sodium or potassium hydroxide with a concentration of 3 to 10%,