Method for producing magnesium sulfate from colored waste sulfuric acid in ion exchange resin production

An ion exchange resin, waste sulfuric acid technology, applied in magnesium sulfate, chemical instruments and methods, multi-stage water treatment, etc., can solve problems such as ineffective removal, complicated processes and equipment, etc.

Active Publication Date: 2017-12-15
JIANGSU JIANYA ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It cannot be effectively removed by the usual gravity natural settlement method, and the process and equipment are complicated

Method used

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  • Method for producing magnesium sulfate from colored waste sulfuric acid in ion exchange resin production
  • Method for producing magnesium sulfate from colored waste sulfuric acid in ion exchange resin production
  • Method for producing magnesium sulfate from colored waste sulfuric acid in ion exchange resin production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ① Take bitter soil powder (magnesia content 75%) and waste sulfuric acid (concentration 57%) as raw materials, and weigh them in equimolar amounts (1:1) according to the size of the reaction vessel; 15 tons of bitter soil powder. 46.9 tons of waste sulfuric acid.

[0031] ② Add waste sulfuric acid to the reaction kettle first, and under agitation, add coagulant (based on the total amount of waste sulfuric acid) by weighing respectively, so that the concentration in the total solution is: dodecyl dimethyl benzyl chloride Ammonium chloride (PAN) 5000ppm, carboxymethyl chitosan (CMTS) 3ppm, polyacrylamide 10ppm, polyaluminum chloride 50ppm, polyferric sulfate 10ppm; stir the solution evenly.

[0032] ③ When the alum flower and color of the solution remain unchanged, stand still for about half an hour, remove the precipitate through a cloth bag centrifuge or plate filter (filter for the first time), and put the filtrate (measured T%, COD) into the reaction kettle again.

...

Embodiment 2

[0037] ①With bitter soil powder (magnesia content 91%) and waste sulfuric acid (concentration 71%) as raw materials, the two are based on the size of the reaction vessel (50m 3 Reactor), the present embodiment feeds total volume by 40m 3 count. Equimolar amount (1:1) weighed; Bitter soil powder 12.5 tons. 39.3 tons of waste sulfuric acid.

[0038] ② The reaction kettle is first added with waste sulfuric acid, and under stirring, add coagulants (in terms of the total amount of waste sulfuric acid) by weighing respectively, so that the concentration in the total solution is: dimethyldienylpropyl ammonium chloride ( DMDAAL) 100ppm, carboxymethyl chitosan (CMTS) 10ppm, polyacrylamide 10PPm, polyaluminum chloride 50ppm, polyferric sulfate 50ppm (adding for the first time), stir the solution evenly.

[0039] ③ When the alum flowers and color of the solution are observed, stand still for about half an hour, remove the precipitate through a cloth bag centrifuge or plate filter (pri...

Embodiment 3

[0044] ① Take bitter soil powder (magnesia content 91%) and waste sulfuric acid with a concentration of 80.2% as raw materials, both of which are based on the size of the reaction vessel (50m 3 Reactor), the present embodiment feeds total volume by 40m 3 Equimolar amount (1:1) weighed; 12.5 tons of bitter soil powder. 34.9 tons of waste sulfuric acid.

[0045] ② The reaction kettle is first filled with waste sulfuric acid, and in the stirring state, the coagulant (based on the total amount of waste sulfuric acid) is weighed and added respectively, so that the concentration in the total solution is: dicyandiamide formaldehyde 5000ppm, dimethyl dienyl Propyl ammonium chloride (DMDAAL) 50ppm, carboxymethyl chitosan (CMTS) 10ppm, polyacrylamide 10ppm, polyaluminum chloride 50ppm, polyferric sulfate 50ppm.

[0046] ③ When the alum flowers and color of the solution are observed, stand still for about half an hour, and remove the precipitate through a cloth bag centrifuge or a plat...

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Abstract

The invention discloses a method for producing colorless or white magnesium sulfate from colored waste sulfuric acid produced in an ion exchange resin production process and magnesia powder through a reaction, wherein the waste sulfuric acid is black and yellowish-brown, the mass percentage concentration is 20%-80%, and the average chroma is 400-1000 times/water; the magnesia powder contains 75%-91% by weight of magnesia. According to the method, on the premise that the conventional magnesium sulfate production equipment and process are basically unchanged, organic and inorganic substances capable of effectively changing colloidal particle potential E of coloring substances (colloidal organic substances) of the waste sulfuric acid are introduced to form a coagulant, so that sulfuric acid coloring substances react with the coagulant, flocculation and precipitation are produced, the coloring substances are separated and removed conveniently, and the colorless or white magnesium sulfate product is produced. Sulfonated colored waste sulfuric acid in ion exchange resin production can be conveniently used for preparing the magnesium sulfate product meeting national standards, waste is changed into wealth by means of comprehensive utilization, COD in waste sulfuric acid liquid can be reduced substantially, the COD in the waste acid is reduced by 80%, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of fine chemical industry. A method for producing colorless or white magnesium sulfate by using one or more surfactants and flocculant-based coagulation decolorizers to remove the color of waste sulfuric acid in the production of ion exchange resins. Background technique [0002] Can produce a large amount of waste sulfuric acid 20-80% (percentage by weight) (black tan, average chromaticity 400-1000 times / water)) in the sulfonation process of producing cationic exchange resin, because its waste acid can be comprehensively utilized, prepares various Chemical products such as sulfates. Among them, magnesium sulfate products can be produced with magnesium-containing minerals such as bitter earth powder. Magnesium sulfate is widely used in chemical industry, medicine, construction, metallurgy, etc. It is a broad-spectrum chemical raw material. The waste sulfuric acid (20-80%) produced in the sulfonation process of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F5/40
CPCC01F5/40C02F1/001C02F1/56C02F2301/08
Inventor 戴亚平邱志荣易凯
Owner JIANGSU JIANYA ENVIRONMENTAL PROTECTION TECH CO LTD
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