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A pharmaceutical company did some calculations. Judging from the data, although switching to dry screw pumps requires capital investment, once applied to the production line, the investment can be recovered in less than three months (Note: The plans and products used by each pharmaceutical company are not necessarily the same, so the costs vary. ； This article takes an investment of 150,000 yuan in the transformation of dry screw vacuum pumps and related devices as an example). Let’s look at it in detail. 1 In the organic solvent suction filtration process, it has been proven in practice that the dry screw vacuum pump can meet the process requirements of the organic solvent suction filtration in the pharmaceutical process. The economic benefits of dry screw vacuum pump application come from two aspects:: Organic solvent recycling and water conservation. ①Condensation recovery of organic solvents: After distillation, it can be returned to production and use, which can correspondingly reduce the use of industrial acetonitrile and achieve cost savings. Specifically - using this dry screw vacuum pump: The suction filtration runs for 5 hours a day, and an average of 67 liters of organic solvent can be recovered per hour. The average content of acetone in the recovered organic solvents is 92.5% (industrial acetone purchase price is 8.5 yuan/kg, distillation recovery cost is 1.5 yuan/kg, distillation recovery rate is about 90%, acetone density is 0.785g/mL). cost saving: 67 liters/hour × 5 hours × 92.5% × 90% × 0.785 kg/liter × (8.5-1.5) yuan/kg = 1532 yuan/day ② Save water: Dry screw vacuum pumps basically consume no water. The water ring vacuum pump consumes 1.5 tons of water per hour, 5 hours per day ； Tap water is calculated at 4.5 yuan/ton and sewage treatment fee is calculated at 30 yuan/ton, which means a daily water consumption saving of 259 yuan. Payback period: 150,000 yuan ÷ (1532+259) yuan/day = 84 days. In addition, the application of dry screw vacuum pumps can also bring huge environmental benefits.: Most of the volatile organic solvent gas is condensed and recovered, which can * * Reduce gas emissions ； Using circulating water cooling technology, * * Reduce wastewater discharge. 2 In the vacuum drying process, the economic benefits of dry screw vacuum pumps in the drying process come from two aspects:: Organic solvent recycling and water conservation. ①Condensation recovery of organic solvents: The organic solvent can be returned to production for use after distillation and recovery, which accordingly reduces the use of industrial solvents and saves costs. Specifically - the vacuum drying process runs for an average of 12 hours per batch, one batch per day ； The average amount of organic solvent that can be condensed and recovered per batch is 295 liters ； Among them, the average content of propylene glycol is 92.7% (the related costs of propylene glycol are as mentioned above) cost saving: 295 liters/day × 92.7% × 90% × 0.785 kg/liter × (8.5-1.5) yuan/kg = 1352 yuan/day ② Save water: Dry screw vacuum pumps basically consume no water. The water ring vacuum pump consumes 1.5 tons of water per hour, 1 batch per day for 12 hours ； The tap water fee is 4.5 yuan/ton and the sewage treatment fee is 30 yuan/ton. This saves 621 yuan in water consumption every day. Payback period: 150,000 yuan ÷ (1352+621) yuan/day = 76 days Environmental benefits are the same as above: Reduce waste gas and waste water emissions. Conclusion The application of dry screw vacuum pumps in the pharmaceutical process can not only save costs and improve economic benefits, but also improve environmental benefits and thus social benefits. Therefore, in the pharmaceutical/chemical industry, dry screw vacuum pumps have received more and more attention and application from manufacturing and application units.