Determination method for K<2>O content in production of potassium dichromate

A potassium dichromate and determination method technology, applied in the field of chemical engineering, can solve problems such as large errors in analysis results and difficulty in controlling the precipitation of potassium tetraphenylborate, etc., achieving high accuracy, good reproducibility of results, and simple operation methods Effect

Active Publication Date: 2019-01-15
HUBEI ZHENHUA CHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

[0005] However, in the actual inspection process, the conditions for the precipitation of potassium tetraphenylborate are difficult to control. During parallel determination, the amount of potassium tetraphenylborate precipitate produced is different, and the error of the analysis results is very large.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 50g (accurate to 0.0001g) of standard potassium dichromate in a 250ml beaker, add an appropriate amount of water, and heat to dissolve on an electric furnace. After cooling, transfer to a 250ml volumetric flask, add water to dilute to the mark, shake well, at this time K 2 The O content is about 63.9g / L.

[0022] Take 25.00ml respectively in four 250ml beakers of A, B, C and D. Add 10ml of hydrochloric acid (1+1) and appropriate amount of ethanol and water respectively, and place in a water bath at 100°C for 1-2 hours until Cr 6+ After the reduction is complete (detected with diphenylcarbazide indicator), add liquid alkali to adjust the solution to neutral, keep it in a boiling water bath for 1 hour, filter with slow quantitative filter paper, wash with hot water until there is no K + So far (tested with sodium tetraphenylborate solution), the filtrate was collected in a 250ml beaker.

[0023] Among them, A and B are carried out according to the traditional met...

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Abstract

The invention discloses a determination method for K<2>O content in the production of potassium dichromate, comprising the following steps of: taking V of the potassium dichromat reaction liquid to bedetected, adding reducing agents to reduce the hexavalent chromium to trivalent chromium under acidic conditions, adding alkali to neutralize until the solution is neutral, keeping the temperature at90-100 DEG C for 1-2 h, filtering and washing to be free of K<+>, and collecting the washing solution; heating the obtained washing solution to boiling, adding sodium tetraphenylborate solution dropwise under stirring to generate potassium tetraphenylborate precipitates, and cooling and standing; transferring the cooled solution obtained in the step 2 to a G4 glass sand core hopper dried to a constant weight at 120 DEG C to carry out the suction filtration, washing the obtained precipitations with the potassium tetraphenylborate solution, and finally placing into a dryer to dry to the constant weight W; and calculating the K<2>O content as A = 0.1314W1000 / V.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, in particular to a kind of potassium dichromate production process 2 Determination method of O content. Background technique [0002] In the industrialized production of potassium dichromate, in order to ensure that KCl100% is utilized, the addition of KCl is 98% of the theoretical amount, and Na 2 Cr 2 o 7 Slightly overdose. After a period of production according to this ratio, there will be a "loss" K in the system + Phenomenon, or due to measurement and other reasons also lead to K + / Cr 6+ The ratio is out of balance, which affects production. Therefore, it is necessary to regularly check the K in the production system 2 Cr 2 o 7 、K 2 The content of O is determined to guide production. [0003] K in the system 2 Cr 2 o 7 The determination of the content is carried out by the redox determination of ammonium ferrous sulfate, which is a relatively classic method, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04G01N31/02G01N1/28G01N1/34G01N1/38G01N1/44G01N1/42
CPCG01N1/28G01N1/34G01N1/38G01N1/42G01N1/44G01N5/04G01N31/02G01N2001/386
Inventor 卢国美廖荣黄国强马丹段静李超雄苏晓亮曹嵩商琴王松
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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