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Production technique of medical pure glycerin from crude glycerin by ester exchange method

A production process, crude glycerin technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve problems not suitable for large-scale industrial production, reduce alkalinity, reduce production costs, reduce side effects The effect of the reaction

Inactive Publication Date: 2003-12-03
杨宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the process of using ion exchange resin to process medicinal pure glycerin is technically effective, it is not suitable for large-scale industrial production due to the cost of resin regeneration and waste resin disposal.

Method used

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  • Production technique of medical pure glycerin from crude glycerin by ester exchange method
  • Production technique of medical pure glycerin from crude glycerin by ester exchange method

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Embodiment Construction

[0009] Such as figure 1 As shown, a production process of crude glycerin by transesterification method to produce medicinal pure glycerin, the crude glycerin by transesterification method is first acidified with concentrated sulfuric acid, the pH is 6, the acidification time is 1 hour and 10 minutes, and the temperature is controlled at 85°C .

[0010] Treat the acidified crude glycerin by transesterification with chemical agent, put the acidified crude glycerin by transesterification into the reaction tank ①, heat to 98°C, add calcium oxide or calcium hydroxide accounting for 2.5% of the mass of the raw material to remove free fatty acids and most of SO 4 2- , using the generated precipitation to adsorb and settle methyl esters, colloids, pigments, etc.; the treated substances are circulated and filtered through a filter press and sent to the reaction tank ②, heated to 98°C, and 1.2% barium hydroxide is added to account for the mass of raw materials Reagent to remove SO 4...

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Abstract

A process for preparing medical-pure glycerine from the ester exchange process crude glycerine includes such steps as acidifying by concentrated sulfuric acid, treating with medicament for removing impurities including fatty acid, methyl ester, colloid, pigment, etc., then vacuum concentrating to form crude glycerine, cyclic degassing and drying, cyclic distilling, deodoring and decoloring to obtain the medical-pure glycerine. Its advantage is high purity up to 99.5% or more.

Description

1. Technical field [0001] The invention relates to a production process for producing medicinal pure glycerin, in particular to a production process for processing medicinal pure glycerin with crude glycerin by transesterification. 2. Background technology [0002] The content of glycerol in the crude glycerin of transesterification is 40-70%, which contains a large amount of methyl esters, pigments, colloids and other impurities. The crude glycerin by transesterification is generally used as raw material to produce industrial glycerin, and the added value of the product is low. Although the process of using ion exchange resin to process medicinal pure glycerin is technically effective, it is not suitable for large-scale industrial production due to the cost of resin regeneration and waste resin treatment. [0003] The object of the present invention is to provide a production process for producing medical pure glycerin by using existing equipment and simple process of tran...

Claims

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Application Information

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IPC IPC(8): C07C29/88C07C31/22
Inventor 杨宏廖其志刘大凯苟文勋王山英
Owner 杨宏
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