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Centrifugal extraction solvent extraction to extract caffeine from tea

by:Deyuan      2020-09-14
Caffeine is in nature, there are 100 species of plant leaves, roots and fruit. Mainly exists in: coffee, cocoa, tea tea, Holly, etc. Tea contains caffeine, accounts for about 1% ~ 5%, also contains 11 - 12% of tannin ( Tannic acid) , 0. 6% of the pigment, cellulose, protein, etc.
in the past industrial synthesis of caffeine production methods are:
1, urea method: from chloroacetic acid by neutralization; Cyanide; Get cyanoacetic acid acidification, then with urea. 。 。







caffeine is in nature, there are 100 species of plant leaves, roots and fruit. Mainly exists in: coffee, cocoa, tea tea, Holly, etc. Tea contains caffeine, accounts for about 1% ~ 5%, also contains 11 - 12% of tannin ( Tannic acid) , 0. 6% of the pigment, cellulose, protein, etc.
in the past industrial synthesis of caffeine production methods are:
1, urea method: from chloroacetic acid by neutralization; Cyanide; Get cyanoacetic acid acidification, condensation, then with urea melamine acetyl urea, then through cyclization; Acidification; Nitrosation; Reduction; Acylation. Methylation is caffeine.
2, dimethyl urea method: by urea and methylamine condensation into dimethyl urea, cyanoacetic acid condensation of 1, 3 - again Dimethyl acetyl urea, then via cyclization; Nitrosation; Reduction; Formylation. Cyclization; Methylation is caffeine. High yield; The cost is low; Consumption; Period is short; Equipment requirements is not high; Easy to operate; Easy to control, is suitable for industrial production.
3 and a half, synthesis, extraction of theobromine, then get caffeine methylation, this is half a synthesis of earlier. From the bird droppings or uric acid preparation of caffeine also belong to this type of synthesis.
DE source extraction with solvent extraction method to extract caffeine from tea: 1, containing a large number of alkaloids in tea with caffeine is given priority to, so we choose from tea extract. 2, caffeine in ethanol solubility is larger, and non-toxic, easy recycling so choose ethanol as the solvent. 3,CWL - M type centrifugal extraction machine has the extraction time is short, saving solvent and higher extraction efficiency, so choose. cwl - M type centrifugal extraction machine to extract caffeine. 4, easy sublimation, because caffeine and other ingredients in the tea not easy sublimation, so after the ethanol extraction distillation, evaporation and caffeine in addition to water and sublimation.
using 95% ethanol as solvent, extracting caffeine from tea, with cellulose and protein separation, insoluble in ethanol extract of in addition to caffeine, contains impurities such as chlorophyll, tannic acid. Steamed to solvent, stir in lime in the coarse caffeine, make its acid and tannic acid to generate calcium salt. Get purification free of caffeine by sublimation.
centrifugal extraction machine to extract caffeine from tea plant USES the solvent to extract features:
(1) to adapt to the strong performance - — Compared with the traditional van and extraction tower equipment, under the effect of centrifugal force, the remaining time is short, split phase quickly, to adapt to the wide range of flow ratio, and processing power; By changing the weir plate and frequency control of motor speed can meet the different density and viscosity of liquid materials;
2 material stock of small - — Two-phase material stock in the equipment is small, short contact time, more suitable for processing because of long time volatile activity and variability of materials such as antibiotics, etc. , of course, individual system needs two phase together contact time long also can operate separately.
(3) high extraction efficiency - — Phase equilibrium set up fast, easy to implement series single stage or multistage counter-current or wrong washing and extraction, high mass transfer efficiency and grade efficiency approaching 100%, stop not to undermine the established after concentration distribution at different levels, can at any time at all levels of sampling, facilitate testing.
(4) to take up the space is little, — Motor direct drive, no transmission attachments, compact structure, save area and operating space, less auxiliary equipment.
5] adaptable - — Not because of the change of the material influence extraction effect, can deal with small difference in density between the viscosity of the system, and has a strong ability of demulsification.
[6] equipment easy to enlarge - — Practices prove that small equipment in lab scale and mass production with large equipment effect is exactly the same, unnecessary to consider the amplification effect.
once investment costs low - — Content of small machine, extraction solvent, solvent or detergent consumption minimum
being sealed performance is good, — Meet the explosion-proof, and the application of the poisonous and harmful and volatile medium environment and the requirements of GMP.








DE source extraction recommend the centrifugal extraction machine, solvent extraction method to extract caffeine from tea help you understand the extraction equipment and production capacity, technological process, characteristics of the equipment, such as detailed specification, at the same time can also see the relevant customer case and extraction equipment solution, the research trend, you can also browse all extraction equipment.
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