Process for the preparation of stable iodate-exchanged synthetic hydrotalcite with zero effluent discharge

A technology of hydrotalcite and zero waste liquid, which is applied in the field of hydrotalcite and can solve problems such as the final treatment of waste liquid that is not mentioned

Inactive Publication Date: 2013-06-19
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is said that part of the potassium iodate remains in the waste liquor, and in addition, all the potassium ions originally present in the potassium iodate are also present in the waste liquor, but there is no mention of the final disposal of the waste liquor

Method used

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[0024] The present invention provides a method for preparing stable iodate-exchanged hydrotalcite as an iodizing agent with zero liquid waste discharge.

[0025] Accordingly, the present invention provides a process for the preparation of stable iodate-exchanged hydrotalcites with zero liquid waste discharge, said process comprising the steps of:

[0026] a) Grinding food compatible and carbonate exchanged synthetic hydrotalcite to pass 60BSS mesh;

[0027] b) calcining the powdered hydrotalcite obtained in step (a) at a temperature of 450 to 550° C. for 30 to 75 minutes;

[0028] c) cooling the burned hydrotalcite obtained from step (b) to a temperature of 60 to 70° C.;

[0029] d) heating an aqueous iodate solution having a concentration of 0.025-0.25M to a temperature of 60 to 70°C;

[0030] e) adding the solid synthetic hydrotalcite obtained from step (c) to the warm potassium iodate solution obtained from step (d), and maintaining the temperature in the range of 60-70° ...

specific Embodiment approach

[0050] The present invention describes a process for the preparation of stable iodate-exchanged hydrotalcites with zero liquid waste discharge. The present invention also provides for recycling the filtrate obtained after the calcined synthetic hydrotalcite absorbs the iodate to eliminate waste discharge while making the process more cost-effective. This improved method does not use KIO except for initializing the method 3 to prepare the iodate solution; conversely, it utilizes the elemental iodine that consumes KOH in the spent solution, and also facilitates the recycling of residual potassium iodate remaining in the spent solution after the intercalation process.

[0051] The method for preparing iodate-exchanged hydrotalcites is described as follows:

[0052]At 450 to 500° C., hydrotalcite is calcined to remove carbon dioxide, represented by the following reaction formula (1).

[0053] [Mg (1-x) Al x (OH) 2 ] x+ CO 3(x / 2) →Mg (1-x) Al x o (1+x / 2) +x / 2CO 2 +H 2 O...

Embodiment 1

[0077] 92 grams with MgO:Al equal to 6.0 2 o 3 Molar ratio, with intensity peak (A 0 )7.77, 3.87, 2.57, 1.53, 1.50, 1.42 XRD pattern and 1370cm -1 The hydrotalcite with the sharp infrared absorption peak of interlayer carbonate ions was ground into powder to pass through a 60BSS mesh and calcined in a furnace at 500 °C for 75 min. The calcined hydrotalcite was cooled to 65°C. This was added to 500 ml of a solution prepared in distilled water containing 8.45 g (0.04 mol) of potassium iodate solution, which was heated to 70°C before the addition. The reaction mass was stirred for 5 minutes, maintaining the temperature, and allowed to stand for 1 hour with intermittent stirring for 1 minute at 30 minute intervals. The resulting slurry was filtered. The separated solid was washed with distilled water until the washed filtrate with silver nitrate did not show any silver iodate precipitation. The solid was dried at 110°C. The dried material was analyzed for iodine content by ...

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Abstract

The present invention relates to a process for the preparation of stable iodate-exchanged hydrotalcite with zero effluent discharge. The iodate-exchanged hydrotalcite produced is useful as iodizing agent. The invention further relates to utilization of alkaline effluent generated in the process of ion exchange of iodate into SHT so as to fully recycle the residual iodate anion and also utilize the alkali generated in the process for production of additional quantities of iodate through reaction with iodine crystals followed by electrochemical oxidation to obtain pure aqueous solution of iodate salt which can be reused for preparation of the stable iodizing agent. The process gives zero effluent discharge hence economical.

Description

technical field [0001] The present invention relates to a process for the preparation of stable iodate exchanged synthetic hydrotalcites with zero effluent discharge. [0002] More specifically, the present invention relates to a process for regenerating iodate from elemental iodine using the alkaline effluent produced during said iodate exchange, making this process zero effluent and thus more economical. Background technique [0003] Iodine is a very important trace element necessary for the biosynthesis of thyroid hormones. Iodine is needed to develop and maintain a healthy body. There are known iodine deficiency disorders such as goiter and cretinism. Table salt was chosen as the iodine-providing vehicle due to its consistent consumption and availability to all segments of the population independent of social or economic status. In order to provide sufficient iodine to consumers while avoiding unnecessary overdose of iodized salt in salt (which is often done to make u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/00A23L1/304C01F7/785
CPCA23L1/22C01P2002/22A23L1/304C01F7/005A23L27/00A23L33/16C01F7/785
Inventor P·K·戈施M·R·甘德希S·H·梅塔G·拉马查恩德雷亚J·R·丘纳瓦拉M·V·舍斯G·S·戈希尔
Owner COUNCIL OF SCI & IND RES
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