A kind of water-in-oil hydroquinone emulsion, preparation method and application thereof
A hydroquinone emulsion, water-in-oil type technology, applied in the field of medicine, can solve problems such as easy to break emulsion, easy to change color, easy to oxidize, etc., to achieve the effect of reducing production cost, shortening production cycle, and easy operation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0071] Example 1 The preparation of hydroquinone of the present invention
[0072] The preparation method of hydroquinone, comprises the steps:
[0073] 1) MnO 2 Add 280g, 430g of 98% sulfuric acid, and 2.0L of water into the reaction flask, slowly add 100g of aniline dropwise at 5-10°C, stir, and gradually raise the temperature to about 25°C until the reaction is complete. The reaction liquid is steam distilled at 60-90°C, and the collected p-benzoquinone condensate is introduced into another reaction flask;
[0074] 2) Under the conditions of shading and nitrogen protection, add 42g of iron powder to the collected p-benzoquinone condensate, stir and react for 3-4 hours at 90-100°C, until the reaction is complete, filter, and depressurize the collected filtrate Concentrated to the hydroquinone content in the concentrated solution is 35%;
[0075] 3) Add 550mg of sodium metabisulfite, 2.2g of activated carbon, and 330mg of zinc powder to the concentrated solution, heat ...
Embodiment 2
[0076] Example 2 The preparation of hydroquinone of the present invention
[0077] The preparation method of hydroquinone, comprises the steps:
[0078] 1) MnO 2 Add 350g, 500g of 98% sulfuric acid, and 2.0L of water into the reaction flask, slowly add 100g of aniline dropwise at 5°C-8°C, stir, and gradually raise the temperature to about 25°C until the reaction is complete. The reaction liquid is steam distilled at 60-90°C, and the collected p-benzoquinone condensate is introduced into another reaction flask;
[0079] 2) Under the conditions of shading and nitrogen protection, add 60g of iron powder to the collected p-benzoquinone condensate, stir and react for 2-3 hours at 90-100°C, until the reaction is complete, filter, collect the filtrate and concentrate under reduced pressure To the hydroquinone content in the concentrated solution is 25%;
[0080] 3) Add 750mg of sodium pyrosulfite, 3.1g of activated carbon, and 500mg of iron powder to the concentrated solution,...
Embodiment 3
[0081] Example 3 The preparation of hydroquinone of the present invention
[0082] The preparation method of hydroquinone, comprises the steps:
[0083] 1) MnO 2 Add 250g, 370g of 98% sulfuric acid, and 2.5L of water into the reaction flask, slowly add 100g of aniline dropwise at 6-10°C, stir, and gradually raise the temperature to about 25°C until the reaction is complete. The reaction liquid is steam distilled at 70-95°C, and the collected p-benzoquinone condensate is introduced into another reaction flask;
[0084] 2) Under the conditions of shading and nitrogen protection, add 31g of iron powder to the collected p-benzoquinone condensate, stir and react at 90-100°C for 2-3 hours, until the reaction is complete, filter, collect the filtrate and concentrate it under reduced pressure to The content of hydroquinone in the concentrated solution is 30%;
[0085] 3) Add 550 mg of sodium pyrosulfite, 2.20 g of activated carbon, and 350 mg of zinc powder to the concentrated ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More