Method for extracting purple yam red colouring matter using membrane separation method

A technology for purple sweet potato and red pigment, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of pigment destruction, complex production process, less resources, etc., and achieve good pigment stability and high recovery rate. , the effect of high safety

Inactive Publication Date: 2006-07-26
吴仲贤 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of resources and the high extraction cost of traditional production techniques, it is difficult to produce on a large scale
[0004] The traditional pigment extraction process mostly uses old processes such as leaching, evaporation concentration, and solvent purification, which have problems such as high energy consumption, difficult solvent recovery, complicated production process, damaged pigment, and low product purity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to one of the technological processes, take 200 kg of fresh purple sweet potatoes, slice them after washing, and put them in a volume of 2m 3 In the immersion tank, inject the citric acid aqueous solution that concentration is 5%, adjust immersion temperature to 40 ℃, after 1.5 hours, extract red pigment solution from immersion tank, filter with pumping filter press, filter out granular impurities, after filtering The pigment liquid is pumped into the cross-flow ultrafiltration membrane module at a pressure of 0.4MPa. After pretreatment and separation, the acid solution containing part of the pigment is obtained, and the remaining pump pressure is used to return the soaking tank for reuse; the obtained enriched red The pigment solution, still under the action of the remaining pump pressure, enters the cation exchange tower to remove water-soluble impurities that will cause pollution and blockage of the nanofiltration and reverse osmosis membranes; pump it into ...

Embodiment 2

[0026] According to the second process, 200 kg of fresh purple sweet potatoes, washed and sliced, put in a volume of 2m 3 In the immersion tank, inject the citric acid aqueous solution that concentration is 5%, adjust immersion temperature to 40 ℃, after 1.5 hours, extract red pigment solution from immersion tank, filter with pumping filter press, filter out granular impurities, after filtering The pigment liquid is pumped into the cation exchange tower at a pressure of 0.1MPa to remove impurities that will cause pollution and blockage of the nanofiltration and reverse osmosis membranes; pumped into the cross-flow nanofiltration membrane (NF) at a pressure of 0.6MPa ) component to separate out more than 95% of the non-pigmented part in the solution, and the concentration of the pigmented solution at this time is about 20% to 30%, and the remaining acid solution after separation is returned to the soaking tank for recycling; The pigment solution, under the effect of 2.0MPa pump...

Embodiment 3

[0028] According to one of the technological processes, 200 kg of fresh purple sweet potatoes, washed and sliced, put into a volume of 2m 3In the immersion tank, inject the citric acid aqueous solution that concentration is 5%, adjust immersion temperature to 40 ℃, after 1.5 hours, extract red pigment solution from immersion tank, filter with pumping filter press, filter out granular impurities, after filtering The pigment liquid is pumped into the fluidized bed cation exchange tower at a pressure of 0.1MPa to remove impurities that will cause pollution and blockage of the nanofiltration and reverse osmosis membranes; pumped into the cross-flow nanofiltration at a pressure of 0.6MPa Membrane (NF) module, which separates more than 95% of the non-pigmented part of the solution, the concentration of the pigmented solution at this time is about 50% to 60%, and the remaining acid solution after separation is returned to the soaking tank for recycling; nanofiltration separation The ...

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Abstract

This invention is related to a kind of method for barrier separation extrating red colouring matter from sweet potato. It extrat red colouring matter solution from acidificated solution of the purple sweet potato's root tuber and other organs, segregation with purify multi-stage separation film and remove impurities to get concentrating liquid end product. The raw materials used in this invention has extensive source and can be operated at normal temperatureits energy consumption is little and has no hazardous or harmful solvent; it is non-polluted, healthy and safe, low cost; extrating recovery ratio of colouring matter is high, which is up to more than 80%. The stability of colouring matter is good, and the tone of the product is high; the secial resource purple sweet potato can be used to prepare newly drug, daily chemical industry and food stain.

Description

technical field [0001] The invention relates to a method for membrane separation and extraction of purple sweet potato red pigment. Background technique [0002] Pigment is an important product that has been widely used in the pharmaceutical industry, food processing, cosmetics production and other industries, but most of them are chemical pigments produced by artificial synthesis. It has been found that many varieties of synthetic pigments are extremely toxic to the human body, and many synthetic pigments are also carcinogenic to the human body. Countries around the world, especially developed countries, have removed many synthetic pigments from the list of permitted pigments. Worldwide, about 70% of the synthetic pigments that were originally allowed to be added to food have been banned. The Ministry of Health of my country promulgated in May 1978 that the only synthetic pigments allowed to be used are four kinds of synthetic pigments such as cochineal, carmine, tartrazin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00B01D61/58
Inventor 吴仲贤邓卉戎李芃王文哲
Owner 吴仲贤
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