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Method for preparing magnesium stearate by normal-pressure melting

A magnesium stearate, melting method, applied in the preparation of carboxylate, organic chemistry, etc., can solve the problem that magnesium oxide cannot react uniformly, and achieve the effect of small equipment investment and high product transparency

Inactive Publication Date: 2014-01-22
NANTONG XINBANG CHEM
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  • Abstract
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Problems solved by technology

[0008] The technical difficulty of producing molten magnesium stearate at normal pressure is that after the reaction temperature is reached, the reactant magnesium oxide is quickly agglomerated, so that the magnesium oxide cannot react uniformly, resulting in an incomplete reaction product entrained with magnesium oxide particles

Method used

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Embodiment

[0018] In another container, 16.8 kilograms of magnesia are stirred with 30 kilograms of water to become pasty magnesia for subsequent use.

[0019] Add 200 kilograms of stearic acid into the reaction kettle, heat to 105°C, start stirring (due to the high viscosity of molten magnesium stearate, the present invention needs to use high-torque stirring.), add 5 kilograms of 30% hydrogen peroxide, At the same time, slowly add the paste-like magnesia prepared in advance. The speed of adding the paste-like magnesia is based on the premise of controlling the reaction without overflow. Wash the magnesia container with 10 kg of water for many times, and add the washing water to the reaction system together to gradually increase the reaction. When the temperature reaches 150°C, drive out the reactants and products and the water produced by the decomposition of hydrogen peroxide. When the reaction system becomes transparent as a whole, keep it at 150°C for 0.5 hours to complete the reacti...

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Abstract

The invention belongs to the technical field of metallic soap preparation and particularly relates to a method for preparing magnesium stearate by normal-pressure melting. The method comprises the following steps: reacting stearic acid with magnesium oxide in a special feeding way at normal pressure and temperature higher than the melting point of stearic acid; granulating or slicing the material obtained after reaction, thereby obtaining magnesium stearate with very high transparency. The method is low in device investment, small in environment pollution and high in product transparency.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal soaps, and in particular relates to a preparation method of magnesium stearate by normal pressure melting method. Background technique [0002] Magnesium stearate is a white, relaxed, non-sandy fine powder with a slight peculiar smell, and the crushed magnesium stearate has a slippery feeling when in contact with the skin. This product is insoluble in water, ethanol or ether, and is mainly used as a lubricant, anti-sticking agent, and glidant. It is especially suitable for the granulation of oils and extracts, and the granules produced have good fluidity and compressibility. Used as a glidant in direct compression. Used in daily chemical and pharmaceutical industries. [0003] The main production process of magnesium stearate is double decomposition method: react stearic acid and sodium hydroxide to form sodium soap, and then form water-insoluble magnesium stearate and waste brine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/126C07C51/41
CPCC07C51/41C07C53/126
Inventor 冒圣华周松涛吴羽峰
Owner NANTONG XINBANG CHEM
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