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Preparation method of sodium tetraborate as pH standard reagent

A sodium tetraborate and reagent technology, which is applied in the field of preparation of sodium tetraborate as a pH reference reagent, can solve problems such as difficulty in control, failure to meet crystal water standards, failure to achieve accuracy, etc., and achieve accurate pH value and uniform particle size , the effect of content balance

Inactive Publication Date: 2013-01-09
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The PH reference reagent sodium tetraborate is used as a quantity and quality transfer reagent for chemical analysis standard solutions in various industries. It is an indispensable working variable reference in analysis and detection. control, causing a lot of inconvenience to use
[0003] At present, the preparation method of pH standard reagent sodium tetraborate is as follows: under the condition that the temperature is not higher than 60°C, dissolve 140g-150g of industrial borax in 300g of water, adjust the pH with sodium hydroxide and boric acid, filter, and stir continuously with a glass rod Solution, crystallization, drying, and drying in the air for 2-3 days to obtain the finished product of sodium tetraborate. The disadvantage of this preparation method is that the finished product of sodium tetraborate still has metal impurities, so it cannot reach the precise pH requirement. Do not lose water in air drying so as not to meet the standard of crystal water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of pH standard reagent sodium tetraborate, the step of its preparation method is:

[0023] 1. Dissolve 40kg of industrial borax in 180kg of deionized water and heat to dissolve;

[0024] 2. Add 228g of sodium carbonate to the borax solution, the reaction temperature is 60°C, react for 1 hour, keep warm for 1 hour, and filter to obtain a primary solution;

[0025] 3. Add 120ml of hydrogen peroxide to the primary solution, the reaction temperature is 60°C, the reaction time is 1 hour, keep the temperature for 1 hour, and filter the concentrated solution to crystallize naturally to form crystals;

[0026] 4. Put the crystals into the reaction kettle, add 120kg of ionized water, heat to the dissolution temperature of 60°C, adjust the pH to 9.187 with boric acid, react for 1 hour, keep the temperature for 1 hour, and filter with activated carbon;

[0027] 5. Pour the solution into the crystallization tank to cool and stir to crystallize, dehydra...

Embodiment 2

[0033] A kind of preparation method of pH standard reagent sodium tetraborate, the step of its preparation method is:

[0034] 1. Dissolve 50kg of industrial borax in 200kg of deionized water and heat to dissolve.

[0035] 2. Add 286g of sodium carbonate to the borax solution, react at a temperature of 60°C, react for 1 hour, keep warm for 1.5 hours, and filter to obtain a primary solution.

[0036] 3. Add 150ml of hydrogen peroxide to the borax filtrate, the reaction temperature is 60°C, the reaction time is 1 hour, the heat preservation is still for 1 hour, and the concentrated solution obtained by filtration crystallizes naturally. Crystallines formed.

[0037] 4. Put the crystals into the reaction kettle, add 150kg of ionized water, heat to the dissolution temperature of 60°C, adjust the pH to 9.187 with boric acid, react for 1 hour, keep the temperature for 1 hour, and filter with activated carbon.

[0038] 5. Pour the solution into the crystallization tank to cool and ...

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Abstract

The invention relates to a preparation method of sodium tetraborate as a pH standard reagent. The preparation method comprises the following steps of: (1) dissolving industrial borax in deionized water, and heating for dissolving to form a boric acid solution; (2) adding sodium carbonate to the borax solution, reacting for 0.5-1.5 hours at 50-60 DEG C and filtering to obtain a primary solution; (3) adding diclofenac water to the primary filter liquor, reacting for 0.5-1.5 hours at 50-60 DEG C and then filtering; (4) washing and filtering; and (5) recrystallizing and drying to obtain a finished sodium tetraborate product as a pH standard reagent. The prepared finished sodium tetraborate product as a pH standard reagent forms granule shapes, and has uniform particle size and balanced content. In the preparation process, a moisturizing drying agent is used to ensure that crystal water in crystals is stable, water does not exist in the crystals, and the optimum content of the crystal water is realized.

Description

technical field [0001] The invention belongs to the field of chemical reagents, in particular to a preparation method of sodium tetraborate, a pH standard reagent. Background technique [0002] The PH reference reagent sodium tetraborate is used as a quantity and quality transfer reagent for chemical analysis standard solutions in various industries. It is an indispensable working variable reference in analysis and detection. control, causing a lot of inconvenience to use. [0003] At present, the preparation method of pH standard reagent sodium tetraborate is as follows: under the condition that the temperature is not higher than 60°C, dissolve 140g-150g of industrial borax in 300g of water, adjust the pH with sodium hydroxide and boric acid, filter, and stir continuously with a glass rod Solution, crystallization, drying, and drying in the air for 2-3 days to obtain the finished product of sodium tetraborate. The disadvantage of this preparation method is that the finishe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/12
Inventor 杨青
Owner TIANJIN CHEM REAGENT RES INST
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