2results about How to "High extraction yield" patented technology

This invention discloses a method for extracting the intermediate ACH, belonging to the field of fine chemicals. The method involves passing a layered acid containing acesulfame potassium (DCM) and a dichloromethane solution into a rotary extraction tower for extraction. The temperature of the layered acid entering the tower is 30-31°C. The extraction pressure and the temperature of the dichloromethane entering the tower are controlled. The extracted dichloromethane layer enters a vibrating extraction tower for back-extraction with deionized water. The back-extracted DCM is neutralized, concentrated, crystallized, and dried to obtain the finished product, potassium acesulfame potassium. Using this method, the ACH content in the extracted acid is reduced to below 0.1%, and the ACH extraction yield reaches over 98%. Because the rotary extraction tower effectively reduces the acid carryover in the DCM, it lowers the back-extraction load, ensuring the product quality of potassium acesulfame potassium. Simultaneously, it simplifies the process conditions, reduces energy consumption, and saves production costs.

An artemisinin continuous gradient forward and reverse flow forward and reverse rotation extraction device belongs to the technical field of artemisinin extraction equipment and comprises a forward flow charging tank, a first reverse flow transition extraction tank, a reverse flow extraction tank, a second reverse flow transition extraction tank, a forward flow extraction tank, a third reverse flow transition extraction tank and a reverse flow slag discharge tank which are communicated with one another in a welding manner; stirring shafts are arranged in the downstream charging tank, the countercurrent extraction tank, the downstream extraction tank and the countercurrent deslagging tank; spiral stirring propelling blades and positive and negative rotation driving motors are arranged on the stirring shafts; a material inlet, a slag outlet, a solvent injection pipe and a liquid taking and collecting pipe are arranged; three solvent bridge tubes and an ultrasonic transducer are additionally arranged; the device has the beneficial effects that the components form a four-stage continuous gradient forward and reverse flow forward and reverse rotation and ultrasonic extraction system, so that the artemisinin extraction yield can be effectively improved, the whole extraction period is shortened, and the production efficiency is improved.