Method for recycling sodium formate and sodium sulfite from waste sodium hydrosulfite liquid with sodium formate method

A recovery method and sodium sulfite technology are applied in the preparation of alkali metal sulfites, chemical instruments and methods, separation/purification of carboxylic acid compounds, etc., which can solve problems such as material waste and environmental pollution, and achieve simple process and high purity. , easy to achieve effect

Inactive Publication Date: 2011-05-11
YANTAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering sodium formate and sodium sulfite in sodium formate hydrosulfite waste liquid, which is used to solve the waste of materials and serious environmental pollution problems caused by the discharge of sodium formate hydrosulfate waste liquid

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  • Method for recycling sodium formate and sodium sulfite from waste sodium hydrosulfite liquid with sodium formate method
  • Method for recycling sodium formate and sodium sulfite from waste sodium hydrosulfite liquid with sodium formate method

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Embodiment 1

[0022] The recovery method of sodium formate and sodium sulfite in the sodium formate method hydrosulfite waste liquid of embodiment 1 comprises the following steps:

[0023] (1) Sodium formate method hydrosulfite waste liquid is firstly filtered through a precision filter and an ultrafiltration device to remove particulate impurities; the molecular weight cut-off of the ultrafiltration membrane of the ultrafiltration device is 5000, and the ultrafiltration temperature is 20°C.

[0024] (2) The waste liquid after removing particulate impurities enters the nanofiltration system for nanofiltration separation; the nanofiltration membrane of the nanofiltration system has a molecular weight cut-off of 150-300, an operating temperature of 20° C., and an operating pressure of 4.0 MPa.

[0025] (3) the nanofiltration permeate liquid returns to the sodium formate production section as the raw material of sodium hydrosulfite or through evaporation, crystallization, filtration, obtains th...

Embodiment 2

[0027] Example 2 The recovery method of sodium formate and sodium sulfite in the sodium formate method hydrosulfite waste liquid, the steps are the same as in Example 1, but the ultrafiltration temperature in the step (1) is 50°C; the operating temperature in the step (2) is 50°C °C, the operating pressure is 1.0MPa.

Embodiment 3

[0028] Example 3 The recovery method of sodium formate and sodium sulfite in the sodium formate method hydrosulfite waste liquid, the steps are the same as in Example 1, but the molecular weight cut-off of the ultrafiltration membrane of the ultrafiltration device in the step (1) is 10000, and the ultrafiltration temperature is 40 ° C; The operating temperature of the step (2) is 40° C., and the operating pressure is 2.0 MPa.

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Abstract

The invention relates to a method for recycling sodium formate and sodium sulfite from waste sodium hydrosulfite liquid with a sodium formate method. The method comprises the following steps of: carrying out precise filtration and ultrafiltration on waste sodium hydrosulfite liquid with the sodium formate method to remove insoluble substances and granular impurities in the liquid; and then introducing the liquid into a nanofiltration device for nanofiltration separation, wherein after being evaporated and concentrated, an obtained nanofiltration permeate solution can be used as a raw material of the sodium hydrosulfite and returned to a sodium hydrosulfite production station, and can also be continuously evaporated, concentrated, crystallized, centrifuged and filtered to obtain a sodium formate product of which the purity is higher than 95 percent; and an obtained nanofiltration concentrated solution can be introduced into an evaporator for concentrating and then is crystallized, centrifuged and filtered to obtain a crude sodium sulfite product. The method has the technical advantages of no secondary pollution, high purity of the sodium formate, simple process and easiness for industrial realization, wherein the purity can be up to higher than 95 percent.

Description

technical field [0001] The invention relates to a method for recovering sodium formate and sodium sulfite in sodium formate method sodium formate waste liquid, in particular to a method for producing high-purity sodium formate and crude sodium sulfite by using nanofiltration technology to separate and purify sodium hydrosulfite waste liquid. Background technique [0002] At present, there are two domestic production processes of hydrosulfite: zinc powder method and sodium formate method. The product quality of the sodium formate method is stable, the production capacity is high, and the manufacturing cost is low. The output of hydrosulfite produced by this method accounts for about 90% of the total output of the country. The sodium formate method is further divided into the caustic soda method and the sodium metabisulfite method. The former is used more. This method produces a large amount of mother liquor while obtaining the hydrosulfite product. After the mother liquor is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14C07C53/06C07C51/42C02F9/10C02F9/02
Inventor 冯咏梅王文华韩晓丽赵旗刘庚鑫匡洪恩
Owner YANTAI UNIV
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