The present invention relates to a preparation technique of a
tranquilizer, in particular to the improvement of the preparation technique of the
tranquilizer, which relates to the technical field of Chinese
medicine preparation. The improved preparation technique includes the following steps: in the process of the preparation of
tranquilizer extract, extract solution is filtered by an ultramicro filter membrane with a
pore diameter between 20mm and 200mm, and after being collected, clear solution is concentrated, so that the tranquilizer extract is finally obtained; in the process of the preparation of the tranquilizer, the mixed liquor is filtered by a tubular
ultrafiltration membrane device, the molecular weight cutoff of the membrane
pore diameter is between 5000 and 200000, the filtering pressure is between 0.1MPa and 0.4 MPa, the filtering temperature is between 0 DEG C and 40 DEG C, and the
membrane flux is between 50L / m<2>h and 300L / m<2>h. The adoption of the ultramicro filter membrane reduces the usage of
ethanol and even can realize non-
ethanol production, the production period is shortened, and the production cost and the
energy consumption are reduced. At the same time, since the filtering technique of the tubular
ultrafiltration membrane is adopted to terminally filter the prepared liquor, the
clarity of the liquor is improved, the product quality is increased, and the stability of the product quality is ensured.