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Method for continuously extracting glycerinum from sweet water

A technology of sweet water and glycerin, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as high energy consumption and operating costs, poor quality and instability of distilled glycerin, and reduce production costs and save Energy, good quality effect

Inactive Publication Date: 2016-05-25
江苏金洲粮油食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glycerol batch distillation method has the disadvantages of relatively poor and unstable distilled glycerin quality, as well as high energy consumption and high operating costs in the production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Put "sweet water" in a reaction pot, add water to dilute the "sweet water" by 1.5 times as mother liquor, heat the mother liquor to 55°C, stir at a constant speed for 3 minutes, and add 15% sodium carbonate solution to it and to a pH value of 8, then add 0.5% aluminum sulfate in the mother liquor to purify the mother liquor. % sodium carbonate solution to adjust the pH value to 8, filter out the resulting flocculent precipitate, concentrate and dehydrate the mother liquor, cool to room temperature to separate the salt, and rectify the obtained crude glycerin at a vacuum degree of 2000Pa and a temperature of 163°C , to obtain pure glycerol.

Embodiment 2

[0010] Example 2: Put "sweet water" in a reaction pot, add water to dilute the "sweet water" by 2 times as mother liquor, heat the mother liquor to 60°C, stir at a constant speed for 4 minutes, and add 20% sodium carbonate solution to it and to a pH value of 8.5, then add 0.5% aluminum sulfate in the mother liquor to purify the mother liquor. % sodium carbonate solution to adjust the pH value to 8.5, filter out the resulting flocculent precipitate, concentrate and dehydrate the mother liquor, cool to room temperature to separate the salt, and rectify the obtained crude glycerin at a vacuum degree of 2000Pa and a temperature of 164°C , to obtain pure glycerol.

Embodiment 3

[0011] Example 3: Put "sweet water" in a reaction pot, add water to dilute the "sweet water" twice as mother liquor, heat the mother liquor to 65°C, stir at a constant speed for 5 minutes, and add 20% sodium carbonate solution to it and to a pH value of 9, then add 0.5% aluminum sulfate in the mother liquor to purify the mother liquor. % sodium carbonate solution to adjust the pH value to 9, filter out the resulting flocculent precipitate, concentrate and dehydrate the mother liquor, cool to room temperature to separate the salt, and rectify the obtained crude glycerin under the condition of vacuum degree of 2000Pa and temperature of 165°C , to obtain pure glycerol.

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PUM

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Abstract

The invention discloses a method for continuously extracting glycerinum from sweet water. The method comprises the following steps: putting the sweet water into a reaction pan, and adding water to dilute the sweet water into 1-2fold as a mother liquid; heating the mother liquid to 55-65 DEG C, and stirring the mother liquid at a constant speed for 3-5 minutes; adding a 15%-20% sodium carbonate solution to neutralize until the pH value is 8-9; adding 0.5% pure aluminum sulfate mother liquid to the mother liquid and carrying out immediate filtration when the color of the mother liquid gradually becomes light and sediments are generated; adding a 15%-20% sodium carbonate solution to neutralize the mother liquid until the pH value is 8-9, filtering out generated flocculent sediments, concentrating and dewatering the mother liquid, cooling the mother liquid to a room temperature and separating a saline matter; and rectifying the obtained crude glycerinum under the conditions that the vacuum degree is 2,000Pa and the temperature is 163-165 DEG C to obtain a pure glycerinum product. An original intermittent distillation technology is replaced; by a continuous production technology, the production cost is reduced; energy sources are saved; and the produced glycerinum is relatively good in quality.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to a method for continuously extracting glycerin from sweet water. Background technique [0002] In the process of oleochemical production, such as oil cracking, saponification, transesterification (oil alcoholysis), etc., in addition to obtaining natural fatty acids, fatty acid salts, and fatty acid methyl esters as the main components, there are also about 10% glycerin sweet water. . Glycerin sweet water is one of the important products in the oleochemical production process and is the main source of natural glycerin. More than 90% of natural glycerin production comes from oil products. [0003] Glycerin has excellent solubility and wetting properties, and can be widely used in medicine, chemical industry, food and other fields. In order to refine the glycerol sweet water produced in the oleochemical production process into medicinal glycerin that meets the pharmaceutica...

Claims

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Application Information

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IPC IPC(8): C07C29/88C07C29/80C07C31/22
CPCC07C29/88C07C29/80C07C31/22
Inventor 徐剑
Owner 江苏金洲粮油食品有限公司
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