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Method for preparing large grain anhydrous sodium sulfate

A technology of sodium sulfate and large particles, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve problems such as complicated operation, increased cost, and inability to meet industrial requirements, and achieve The effect of small dosage and wide application range

Inactive Publication Date: 2007-08-01
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technical improvements have increased the particle size of sodium sulfate to a certain extent, but none of them can meet the industrial requirements, and the above technical transformations have changed the original production process and equipment, which increases the cost and complicates the operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Prepare 1000mL of 320g / L sodium sulfate solution, add it to a small simulated generator, and start heating at a stirring speed of 5m / s; add dodecyl phosphate and dodecylbenzenesulfonic acid accounting for 0.02% by weight of sodium sulfate The sodium mixture is 0.064g, and the mass ratio of the two is 1:1; the temperature is kept constant at 60°C. During the reaction process, water was continuously added to keep the concentration of the solution constant; after 1.5 hours of reaction, the heating was stopped, the solution was discharged, suction filtered, and dried to obtain the product.

Embodiment 2

[0014] Prepare 1000mL of 320g / L sodium sulfate solution, add it to a small simulated generator, start heating at a stirring speed of 2m / s; add 3.2g of styrene and polyethylene glycol mixture accounting for 1% by weight of sodium sulfate, the two The mass ratio was 10:1; the temperature was kept constant at 150°C. During the reaction process, water is continuously added to keep the concentration of the solution constant; after 2 hours of reaction, the heating is stopped, the solution is discharged, suction filtered, and then dried to obtain the product.

Embodiment 3

[0016] Prepare 1000 mL of 320 g / L sodium sulfate solution, add it to a small simulated generator, and start heating at a stirring speed of 0.5 m / s; add 1.6 g of dodecyl dimethyl amine oxide accounting for 0.5% by weight of sodium sulfate; The temperature was kept constant at 260°C. During the reaction process, water is continuously added to keep the concentration of the solution constant; after 2 hours of reaction, the heating is stopped, the solution is discharged, suction filtered, and then dried to obtain the product.

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Abstract

The invention discloses a making method of large-particle anhydrous sodium sulfate, which comprises the following steps: adding 0.01%-10% surface activator with one or more of dodecyl phosphate ester, dodecyl sodium benzosulfonate, dodecyl dimethyl amine oxide, phenylethene or carbowax; adding water under 60-260 deg.c; keeping the constant density of solution to react 1.5-3.0h; stopping heating; filtering; drying; obtaining 80% product over 40 order.

Description

technical field [0001] The invention relates to a preparation method of large-grain sodium sulfate, and belongs to the technical field of chemical synthesis and refining. Background technique [0002] The scientific name of sodium sulfate anhydrous is mainly used in detergent, soda sulfide, natron, papermaking, glass, textile, printing and dyeing vinylon, laxative and antidote for barium salt poisoning in the pharmaceutical industry. There is a great demand for it both at home and abroad, but in recent years, the general particle size sodium sulfate has been oversupplied, and the price has been declining. The large particle sodium sulfate (anhydrous sodium sulfate) has high purity and low solubility. , easy electrolysis and other advantages, used as solar heat storage materials, the preparation of cement early strength agent, and the production of potassium sulfate, etc., but the supply is in short supply, and the price is higher than that of ordinary granular sodium sulfate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/18
Inventor 申世刚张海兵李志远田超
Owner HEBEI UNIVERSITY
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