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Process for refining medicinal ethanol

An ethanol and process technology, applied in the field of refined pharmaceutical ethanol, to achieve the effects of high permeation rate, high membrane flux and simple operation

Inactive Publication Date: 2018-08-21
HUNAN XIANGYIKANG PHARMA
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Problems solved by technology

Even if atmospheric distillation is replaced by vapor pressure distillation, although the total energy consumption is reduced, it is still 4000 KJ / L ethanol

Method used

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  • Process for refining medicinal ethanol
  • Process for refining medicinal ethanol
  • Process for refining medicinal ethanol

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Experimental program
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Embodiment

[0027] Such as figure 1 As shown, the medicinal ethanol refining process mainly consists of 1-fermenter, 2-alcohol-permeable membrane separator, 3-distillation tower, 4-condenser, 5-reboiler, 6-water-permeable membrane separator and 7-collecting tower and other unit equipment.

[0028] (1) The raw material liquid with an ethanol content of 5% to 10% enters the permeable membrane separator 2, and after pervaporation and separation, the waste liquid is discharged from the tower kettle and sent to the fermentation tank 1 for treatment. The operating pressure of the tower is 0.8 Kpa , the operating temperature is 80 ℃;

[0029] (2) The ethanol with a content of 60% to 70% extracted from the top of the alcohol-permeable membrane separator 2 is sent to the distillation tower 3, and after rectification and concentration, the waste liquid is treated by the reboiler 5 and then returned to the distillation tower for recovery again , the decompression operating pressure of the tower is...

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Abstract

The invention discloses a process for refining medicinal ethanol. A double-membrane method and a distillation method are cooperatively used for refining medicinal ethanol. The process is characterizedby comprising the following steps: coupling a modified pervaporation ethanol-permseletive membrane with a fermentation device to realize in-situ separation of ethanol in fermentation liquid and reduce the inhibition of ethanol on a fermentation reaction, which enables continuous operation and the improvement of fermentation speed and yield to be realized; then subjecting the obtained ethanol permeation solution with a high concentration to common rectification and concentration so as to obtain ethanol with a mass fraction of 90% to 95%; dehydrating ethanol with a mass fraction of 90% to 95% by using the modified pervaporation ethanol-permseletive membrane so as to obtain anhydrous ethanol with a mass fraction of more than 99%; and then carrying out sterilization and filtration so as to obtain the medicinal ethanol. The process of the invention is low in production cost and resource consumption and high in raw material utilization rate, and the prepared medicinal ethanol conforms to standards prescribed in the Chinese Pharmacopoeia.

Description

technical field [0001] The invention discloses a process for refining pharmaceutical ethanol, which specifically belongs to the field of medicine and chemical industry. Background technique [0002] Ethanol is an important basic chemical raw material and solvent, which is widely used in national defense industry, medical and health care, organic synthesis, food industry, and industrial and agricultural production. [0003] The concentration of ethanol obtained by fermentation is generally only about 10%. The traditional refining and concentration method is multi-tower rectification, which is not only complicated in process but also high in energy consumption. It is measured that the energy consumption of the distillation part is 50% to 70% of the total energy consumption of ethanol production. [0004] At present, the rectification process adopts chemical method, adsorption method, etc., such as CN1417183A discloses an ultra-pure ethanol refining process, which is mainly co...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80C07C31/08
CPCC07C29/76C07C29/80C07C31/08
Inventor 帅放文王向峰章家伟
Owner HUNAN XIANGYIKANG PHARMA
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