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A method for improving the quality of industrial sodium hexametaphosphate

An industrial technology of sodium hexametaphosphate, which is applied in the field of improving the quality of industrial sodium hexametaphosphate by reverse osmosis membrane filtration, can solve the problems of high desalination rate and large water production volume, and achieve safe and simple operation, stable product quality and remarkable effect Effect

Active Publication Date: 2015-07-29
SHANGHAI WOKAI BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of using reverse osmosis to produce pure water are high desalination rate, large water production, less consumption of chemical reagents, stable water quality, long life of ion exchange resin and long life of terminal filter. At present, there is no use of reverse osmosis technology to improve Related reports and technical research on the quality method of sodium hexametaphosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 1000g of industrial sodium hexametaphosphate into 5000ml of high-purity water with a specific impedance of 17MΩ·cm, stir and dissolve at room temperature, and carry out secondary filtration through a quartz sand filter and a precision filter in turn, and the obtained filtrate is kept at a temperature of 25 ℃, separated by a plate and frame reverse osmosis device, the concentrated solution was evaporated to dryness under normal pressure, and the obtained solid was vacuum-dried at 40-50 ℃ for 8-10 hours to obtain 945g of sodium hexametaphosphate with improved quality.

[0017] The quality-improved industrial sodium hexametaphosphate product was analyzed and tested (the analysis and testing method is the same as the GB1890-2005 quality standard, the same below), and the test results are as follows (the product index column is the standard specified in GB1890-2005):

[0018] project

[0019] pH value

[0020] Note: The GB1890-2005 standard is the nat...

Embodiment 2

[0022] Add 800g of industrial sodium hexametaphosphate into 8000ml of high-purity water with a specific impedance of 17MΩ·cm, stir and dissolve at room temperature, and carry out secondary filtration through a quartz sand filter and a precision filter in turn, and the obtained filtrate is passed through a heat exchanger at a constant temperature to 35 °C, separated by a tubular reverse osmosis device, the concentrated solution was evaporated to dryness under normal pressure, and the obtained solid was vacuum-dried at 40-50 °C for 8-10 hours to obtain 746 g of sodium hexametaphosphate with improved quality.

[0023] The quality-improved sodium hexametaphosphate product was analyzed and tested, and the test results are as follows:

[0024] project

Embodiment 3

[0026] Add 1000g of industrial sodium hexametaphosphate into 7000ml of high-purity water with a specific impedance of 17MΩ·cm, stir and dissolve at room temperature, and carry out secondary filtration through a quartz sand filter and a precision filter in turn, and the obtained filtrate is passed through a heat exchanger at a constant temperature to 40 °C, separated by a spiral reverse osmosis device, the concentrated solution was evaporated to dryness under normal pressure, and the obtained solid was vacuum-dried at 40-50 °C for 8-10 hours to obtain 836 g of sodium hexametaphosphate with improved quality.

[0027] The quality-improved sodium hexametaphosphate product was analyzed and tested, and the test results are as follows:

[0028] project

[0029] As can be seen from the data in the examples, the sodium hexametaphosphate obtained by the method for improving the quality of industrial sodium hexametaphosphate of the present invention has an index measured value ...

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Abstract

The invention discloses a method for enhancing the quality of industrial sodium hexametaphosphate. The method comprises the following steps of: dissolving the industrial sodium hexametaphosphate as a raw material into high-purity water; carrying out secondary filtration, and then keeping constant temperature through a heat exchanger; separating through a reverse osmosis device; reducing the content of impurity ions to obtain a sodium hexametaphosphate product with the quality enhanced. Compared with the prior art, the method can be used for preparing the sodium hexametaphosphate product with the quality enhanced and the total phosphate content (in terms of P2O5) more than 68.5%, and effectively reducing the content of water-insoluble substances and the foreign ions, such as Fe and F, in the sodium hexametaphosphate product which is superior to the quality standard of GB1890-2005. The method for enhancing the quality of the industrial sodium hexametaphosphate, which is disclosed by the invention, has the advantages of safety, easiness and convenience for operation, stable product quality and suitability for industrial production.

Description

technical field [0001] The invention relates to a method for improving the quality of industrial sodium hexametaphosphate, in particular to a method for improving the quality of industrial sodium hexametaphosphate by reverse osmosis membrane filtration. Background technique [0002] Sodium phosphate is the product with the largest output and consumption in fine phosphorus chemical products. Its technology development and market development are relatively mature, mainly including sodium orthophosphate, sodium pyrophosphate, sodium polyphosphate, and sodium metaphosphate. Among them, sodium hexametaphosphate is the most widely used functional phosphate in the market, and can be widely used in industrial production such as washing, water treatment, food, ore dressing, and metallurgy. According to different application directions, sodium hexametaphosphate can be divided into food grade sodium hexametaphosphate and industrial grade sodium hexametaphosphate. [0003] Because sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/445
Inventor 张文栋蒲国龙杜志友王勇飞
Owner SHANGHAI WOKAI BIOTECH
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