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Vitamine C refining process

A vitamin and process technology, applied in the fields of medicine and chemical industry, can solve the problems of increasing industrial production costs, high control parameters, and inconvenient control, and achieve the effects of reducing industrial production costs, high product purity, and low production costs.

Inactive Publication Date: 2007-10-24
徐建涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process either has high purity and low yield; or high yield and low purity, which cannot achieve both and cannot meet the requirements
Moreover, the process control parameters are relatively high, the control is inconvenient, and the industrial production cost is increased.

Method used

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  • Vitamine C refining process
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the vitamin C refining process described in the present invention, 1 part by weight of crude VC solute is added to 1.8 parts by weight of solvent, the temperature is raised to 45±3°C, and 0.01 part by weight of 767 type medicinal powder activated carbon is added to the completely dissolved VC solution, stirred for decolorization and filtration, and then passed the filtrate through a layer of activated carbon with a thickness of 0.6m for gradient filtration. Then pass the filtrate successively through a flat filter layer composed of polypropylene filter membranes with a precision of 0.5um and 0.2um and 5 layers of filter paper, and then filter through a nylon membrane with a precision of 0.22um, and then cool the filtrate to 35±2°C instantaneously, inject In the crystallization tank.

[0029] Add 200 fine VC seed crystals through a mesh sieve to the filtrate in the crystallization tank to reach a concentration of 50ppm, then cool down to 25±2°C at a rate of 10±2°C per...

Embodiment 2

[0035] In the vitamin C refining process described in the present invention, 1 part by weight of crude VC solute is added to 1.5 parts by weight of solvent, the temperature is raised to 50 ± 2 ° C, and 0.01 part by weight of 767 type medicinal powder activated carbon is added to the completely dissolved VC solution, stirred for decolorization and filtration, and then passed the filtrate through a layer of activated carbon with a thickness of 1m for gradient filtration. Then pass the filtrate successively through the polypropylene filter membrane with a precision of 0.3um and 0.1um and a flat filter layer composed of 6 layers of filter paper, and then filter through a nylon membrane with a precision of 1um, and then cool the filtrate to 30±1°C instantaneously, inject crystallization inside the tank.

[0036] Add 250 fine VC seed crystals through a mesh sieve to the filtrate in the crystallization tank to reach a concentration of 100ppm, then cool down to 20±2°C at a rate of 12±...

Embodiment 3

[0041] In the vitamin C refining process described in the present invention, 1 part by weight of crude VC solute is added to 1.2 parts by weight of solvent, the temperature is raised to 55 ± 2 ° C, and 0.012 parts by weight of 767 type medicinal powder activated carbon is added to the completely dissolved VC solution, stirred for decolorization and filtration, and then passed the filtrate through a layer of activated carbon with a thickness of 3m for gradient filtration. Then pass the filtrate successively through a flat filter layer composed of polypropylene filter membranes with a precision of 1um and 0.3um and 8 layers of filter paper, and then filter through a nylon membrane with a precision of 2um, then cool the filtrate to 30±1°C instantaneously, and pour it into a crystallization tank Inside.

[0042] Add 220 mesh sieve fine VC seed crystals to the filtrate in the crystallization tank to reach a concentration of 180ppm, then cool down to 22±2°C at a rate of 8±1°C per ho...

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Abstract

The invention relates to a refining process of vitamin C for extracting refined vitamin C from rough vitamin C. It can be aquired by dissolving vitamin C in pure water, after the process of decolouration by active carbon, filtering it, and cooling and crystallizing the filtrate, then centrifugal dehydrating and vacuum drying it, and then getting the product, characterizing in filtering the filtering medium decolourized by active carbon by an active carbon layer of 0.5m-15m thickness, and then according to secondary filtering, cooling immediately the filtrate to 40- 20 Deg.C, to crystallizing it. The refining process of the invention is easy to industrial operate and of high yield, with improvement from 95 percent to 97-98 percent and the impurity content escalation from 20-100g / t to 0.1-20g / t, and of high purity and good quality, which settled the long-standing contradiction of purified vitamin C between recovery ratio and quality, and the produce cost is low. It is good for spreading and adaptation.

Description

technical field [0001] The invention relates to a vitamin C refining process, which is used for obtaining refined vitamin C from crude vitamin C, and belongs to the technical fields of chemical industry and medicine. Background technique [0002] In industry, obtaining refined vitamin C (hereinafter referred to as refined VC) from crude vitamin C (hereinafter referred to as crude VC) usually all dissolves crude VC and pure water at a temperature above 69° C. with a weight ratio of 1: 1.05, and then Decolorize and filter with 767 activated carbon, cool the filtrate to -2°C for 7 hours, centrifuge and dehydrate, and vacuum dry at a temperature of 55-62°C to obtain the product. The primary mother liquor after dehydration is evaporated and concentrated, then cooled, and the dried crystalline product after centrifugation is mixed with crude VC for reuse. The same process as the first mother liquor can be repeated for the second mother liquor. The block diagram of the process flo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/62
Inventor 徐建涛
Owner 徐建涛