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Production method for improving pyrithione zinc whiteness

A technology of zinc pyrithione and production method, applied in directions such as organic chemistry, can solve the problems such as not introducing a method for improving the whiteness of zinc pyrithione, and achieve the effects of easy operation, stable quality and high product purity

Inactive Publication Date: 2016-07-13
BINHAI COUNTY MINGHONG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method only introduces the purification method of zinc pyrithione, but does not introduce the method of improving the whiteness of zinc pyrithione

Method used

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  • Production method for improving pyrithione zinc whiteness

Examples

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Embodiment 1

[0021] Example 1: In the first step of zinc sulfate purification, 4 kg of zinc powder is added to 5000 kg of 30% zinc sulfate solution at a temperature of 60 ° C, and the heavy metal ions of iron, nickel, copper, chromium and cobalt are removed by filtration with a 0.45 μm filter membrane , so that the heavy metal content is less than 1PPM; through sampling and detection, use atomic absorption spectroscopy equipment to detect whether the heavy metal content is 1PPM. In the second step acid stripping reaction, adding concentration to 5000kg of sodium pyrithione is 30% hydrochloric acid, the pH value is adjusted to 3, and the intermediate SPT solution after the reaction is filtered and washed to remove impurities; in the third step In the salt-forming reaction, adding a concentration of 30% sodium hydroxide solution to the intermediate SPT solution dissolves, and generates sodium pyrithione solution again, so that the concentration of sodium pyrithione is 15%, and the pH value is...

Embodiment 2

[0023] Example 2: In the first step of zinc sulfate purification, add 3kg of zinc powder to 3000kg of zinc sulfate solution with a concentration of 15%, at a temperature of 50°C, and remove iron, nickel, copper, chromium, and cobalt heavy metal ions by filtering through a 0.45 μm filter membrane , so that the heavy metal content is less than 1PPM; in the second step acid stripping reaction, adding concentration to 3000kg sodium pyrithione is 15% hydrochloric acid, the pH value is adjusted to 4, and the intermediate SPT solution after the reaction is filtered and washed, Remove impurities; in the third step of salt-forming reaction, add a sodium hydroxide solution with a concentration of 15% to the intermediate SPT solution to dissolve, and generate sodium pyrithione solution again, so that the concentration of sodium pyrithione is 15%, and the pH value At 9; the sodium pyrithione solution obtained in the third step is adjusted to a pH value of 6 with hydrochloric acid of 15% co...

Embodiment 3

[0025] Example 3: In the first step of zinc sulfate purification, 5 kg of zinc powder is added to 10000 kg of 32% zinc sulfate solution at a temperature of 80 ° C, and the heavy metal ions of iron, nickel, copper, chromium and cobalt are removed by filtration with a filter membrane of 0.45 μm , so that the heavy metal content is less than 1PPM; in the second step acid stripping reaction, adding concentration to 10000kg of sodium pyrithione is 32% hydrochloric acid, the pH value is adjusted to 2, and the intermediate SPT solution after the reaction is filtered and washed. Remove impurities; in the third step of salt-forming reaction, add 50% sodium hydroxide solution to the intermediate SPT solution to dissolve, and generate sodium pyrithione solution again, so that the concentration of sodium pyrithione is 20%, and the pH value At 11; the sodium pyrithione solution obtained in the third step is adjusted to a pH value of 8 with the hydrochloric acid of 32% concentration or the l...

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Abstract

The invention provides a production method for improving pyrithione zinc whiteness.The method comprises the first step of zinc sulfate purification, wherein 3-5 kg of zinc powder is added into 3,000-10,000 kg of a 15-32% zinc sulfate solution, and the temperature ranges from 50 DEG C to 80 DEG C; the second step of peel acid reaction, wherein 15-32% hydrochloric acid is added into 3,000-10,000 kg of sodium pyrithione, the PH value is adjusted to 2-4; the third step of salt forming reaction, wherein a 15-50% sodium hydroxide solution is added to an intermediate SPT solution for dissolution; the fourth step of adjusting the PH value of the sodium pyrithione solution obtained in the third step to 6-8 through 15-32% hydrochloric acid or 15-50% liquid caustic soda; the fifth step of increasing the temperature of the sodium pyrithione solution obtained in the fourth step to 50-80 DEG C, dropping the zinc sulfate solution obtained in the first step to the sodium pyrithione solution until the PH value reaches 5-6 and keeping the temperature of 60-80 DEG C for 3-5 h.

Description

technical field [0001] The invention relates to a production method for improving the whiteness of zinc pyrithione. Background technique [0002] Zinc pyrithione forms insoluble precipitates with cationic and nonionic surfactants, is unstable to light and oxidants, and is unstable to acids and alkalis at higher temperatures. It is not compatible with EDTA, and non-ionic surfactants will partially inactivate it. In the presence of heavy metals, chelation or anti-chelation occurs, and these chelates are poorly soluble in water. Zinc pyrithione is a chelate, which is a very effective anti-fungal and anti-bacterial compound, and its anti-dandruff activity is very strong. [0003] The whiteness of zinc pyrithione is an important indicator of the product. If it is used in shampoo, it will directly affect the appearance of the shampoo. At present, most zinc pyrithione sold in the market is yellowish, and its L value is measured by a whiteness meter. Less than 98, b value great...

Claims

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Application Information

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IPC IPC(8): C07D213/70
CPCC07D213/70
Inventor 赵忠勇郑兆金曹阳谢宇健赵胜王鹏冯启华莫东成涛
Owner BINHAI COUNTY MINGHONG FINE CHEM
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