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• The hot backflow withdraws the concentration unit principle:

Will compound the prescription raw material for medicine investment will withdraw in the pot, disposable will join 5-10 time of raw material for medicine quantity the solvent (solvent nature and joins quantity after technological requirement) to soak the certain time, will open the steam valve to heat up, (will go nonstop to steam heating water will mention only withdraws when essential oil with) after the hypothesis time boils raises, then the high temperature will extract from withdraws the pot base thickly to filter the late arrival filter continuously after the mesh, will enter the concentrator. When concentration produces the steam enters the condenser, becomes the condensate, took the new solvent sprays to withdraws in the pot; Withdraws two steam which in the pot produces, becomes the condensate after the condenser condensation, recedes to withdraws in the pot. All steam which produces by the solvent, all becomes the condensate through the heat change to return to withdraw in the pot, two steam obtain the full use in the process, forms the new solvent big backflow to withdraw, therefore in the raw material for medicine the solute and the solvent maintain the high gradient mass transfer throughout, high speed dissolves. Therefore this set of equipment are extremely superior in the energy conservation and the maintenance solvent balance aspect performance.

The new solvent to withdraws the pot base from top to bottom through the raw material for medicine level dissolution raw material for medicine in solvend, also is sucked in the concentrator. Repetition above process, thus forms the solvent after withdraws -- the concentration (recycling) the big circulation after to return many times, extracts assumes the achromatic color, this time, extracts stops raising into the concentrator. The concentrator continues to carry on the concentration, until achieved needs the proportion (1.1-1.25) the class extracts, emits spare.

• The hot backflow withdraws the concentration unit characteristic:

1. Reduces the productive time 50%, after the facsimile craft withdraws many times concentrates again. But this craft concentration withdraws two working procedures to concentrate while set of equipment carries on, disposable completes only needs (4-6) the hour.
2. Saves above steam 60%, in the concentrator produces two steam may take withdraws pot direct heating the heat source, moreover liquid medicine enters in the concentrator by the high temperature, the hot loss are extremely few.
3. The solvent inputs reduce 60%, withdraws the pot raw material for medicine only to have to add time of solvent, in a set of seals equipment internal recycling use, the dregs of medical decoction and liquid medicine of the carburetion solvent basically all can recycle (attrition rate below 5%), therefore the solvent amount used are few, consumes lowly, production cost large drop.
4. Receives the paste rate to be possible to enhance compared to the traditional process 10%-20%, the drug efficacy ingredient content becomes doubles the enhancement. Because disposable pours into the solvent can realize the big backflow circulation, causes in the raw material for medicine in the solute density and the solvent the solute density maintains the very high gradient throughout. Therefore in the raw material for medicine solute fast dissolves. Receives the paste and active principle receiving rate has obviously increases, lays the good foundation for the drugs qualitative quota appraisal.
5. One machine multipurpose (alone withdraws, alone concentrates, withdraws while concentrates), structure compact, the operation is simple. A set of equipment person then may operate, area small among, saves the accumulator tank, the investment expenses is low.
6. The complete set of equipment uses imports the SUS304 stainless steel manufacture, entire seal channelization production, both reduced the environmental pollution, and eliminates the heavy metal and bacterium permeating, conforms to the GMP requirement completely.
7. Because this equipment moves under the negative pressure condition, therefore withdraws the temperature to be possible in 70-80 ℃ between to adjust wilfully, this and is easy to the heat-sensitivity medicine to have the polyreaction raw material for medicine to withdraw extremely advantageously.