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Refining method of glycerin

A purification method and technology for glycerol, which are applied in chemical instruments and methods, separation/purification of hydroxyl compounds, alkali metal oxides/hydroxides, etc., can solve the problem of high energy consumption, high cost of purifying glycerol, and large amount of waste water, etc. problems, to achieve the effect of reducing production costs, simple and easy-to-obtain adsorbents, and simple operation

Inactive Publication Date: 2019-04-12
HUBEI GEDIAN HUMANWELL PHARMA EXCIPENTS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages in the prior art that the purification of glycerin by rectification method is easy to produce polymers and high energy loss; the purification of glycerol by ion exchange method is expensive, the amount of waste water is large, and the defects of easy-to-corrosion equipment are provided. A kind of refining method of glycerol

Method used

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Experimental program
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Effect test

Embodiment 1

[0025] Preparation of calcium oxide-chitin fiber nanometer mesoporous particle spherical adsorbent: add chitin fiber into dilute calcium hydroxide aqueous solution, stir thoroughly, remove excess free acid, and filter to obtain alkalized chitin fiber. Add 1kg of food-grade calcium hydroxide and 5kg of alkalized chitin fiber to 5kg of distilled water, stir well to form a paste. A spherical pelletizer was used to form 2 mm calcium hydroxide-chitin fiber pellets into pellets. Dry the spheres at 150° C. for 5 hours to remove water and form calcium oxide-chitin fiber nanometer mesoporous spheres.

Embodiment 2

[0027] Preparation of composite adsorbent of decolorizing agent and filter aid: Physically mix 1 kg of medicinal activated carbon or medicinal activated clay with 1 kg of medicinal gypsum or medicinal diatomaceous earth, dry and activate at 120°C for 2 hours. Composite adsorbent for decolorizing agent and filter aid.

Embodiment 3

[0029] Add 3000 kg of industrial grade glycerin with a water content of 4 to 5% into a 5000L reactor, heat to 90°C, and keep the temperature for 2 hours. Cool down to 50°C, add 30 kg of the calcium oxide-chitin fiber nano-mesoporous particle ball adsorbent prepared in Example 1, adsorb for 50 minutes, and filter with a 200-mesh bag filter. Add 3 kg of the activated carbon / diatomite composite adsorbent prepared in Example 2 to the filtrate, adsorb for 2 hours at 60° C., and filter with a 400-mesh plate and frame filter to obtain pharmaceutical grade glycerin.

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Abstract

The invention discloses a refining method of glycerin. The refining method of glycerin comprises the following steps that industrial-grade glycerin with the water content lower than 0.5% is subjectedto the step S1 and S2 or the step S2 and S1 so that the refined glycerin can be prepared. The glycerin content of the industrial-grade glycerin is not lower than 95% by mass; in the step S1, adsorption is conducted through a calcium oxide-chitosan fiber nano mesoporous particle ball adsorbent, and filtering is conducted; in the step S2, decoloration is conducted through a decolorizer, and filtering is conducted. The refining method is easy to operate, the adsorbent is easy to prepare, the impurities are not generated basically, the method is environmentally friendly, the production cost is reduced, and the demand for industrial production is met. Through primary purification, the purity of glycerin can reach 99.5% or above, and metal, inorganic salt, organic impurities and the like meet the officinal-grade demands.

Description

technical field [0001] The invention relates to a method for refining glycerin. Background technique [0002] Glycerin, also known as glycerin, is a chemical with a wide range of uses. It is widely used in industrial fields such as coatings, papermaking, textiles, food, medicine, tobacco, and cosmetics. It is mainly used as an excipient, humectant, and smoothing agent. , sweetener, thickener, antifreeze, emulsifier, etc., can be divided into pharmaceutical grade and industrial grade according to the purity of glycerin. The traditional sources of industrial-grade glycerol are mainly by-products of oil hydrolysis, starch fermentation and diesel production. The crude glycerol produced by synthesis is purified through filtration, concentration, chemical additives, distillation and other processes to obtain industrial-grade glycerol. However, the quality index of pharmaceutical grade glycerin is strictly controlled, and the allowable concentration requirements for chlorides, sul...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/76C07C31/22B01J20/24B01J20/28
CPCB01J20/041B01J20/24B01J20/28016B01J20/28083C07C29/74C07C29/76C07C31/225
Inventor 张阳洋李盛曹金黄虎冉文华唐玉蛟刘淦李文文朱智刚
Owner HUBEI GEDIAN HUMANWELL PHARMA EXCIPENTS
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