During the production of antibiotics, many processes in the post-process refinement process use organic solvents for crystallization, washing, suction filtration, and vacuum drying. In this process, a large amount of organic solvent is volatilized and discharged in a vacuum state, which not only causes an increase in costs, but also pollutes the environment, causing hidden dangers to the health and safety of employees. Solvent consumption analysis Organic solvents are generally used as solvents or detergents during the process and do not participate in the reaction process. Therefore, the consumption of solvents is mainly due to the loss of entrainment of the residue in the process of recovery distillation and the loss of volatiles in the process. The volatilization of acetone in Huabei Pharmaceutical Co., Ltd. is listed in the table. Through the analysis of the status of acetone in the various processes of the shop, the consumption of solvent in the liquid state accounts for only a small proportion, while the loss in the gaseous state is more. The loss of gas phase during the vacuum pump exhaust process is particularly serious, so we have determined the use of new methods to recover the solvent in the exhaust gas. Improved scheme absorption method Recovery of acetone in off-gas Using the characteristics that acetone is easily soluble in water, the acetone in the off-gas is recovered by means of water washing and absorption. The absorption tower is used for absorption first, and then it is recovered by distillation. Determination of the content of gas in the exhaust gas The content of solvent in the gas can be determined by chromatography, but it is difficult to determine the sample collection and sample standards. We have established a method for determining the content of solvents in tail gas. There are many factors that influence the absorption effect of the absorber, and the physical and chemical properties of the gas and absorbent, the size of the absorber, and the filler properties all affect the absorption. In the production process of antibiotics, the process of suction filtration, drying, etc., contains a large amount of organic solvent in the vacuum exhaust, and the absorption method is used for recycling. The effect is good. With the exhaust of the vacuum pump exhaust condenser condensing is not complete, the solvent with the vacuum pump exhaust loss of the project, is the growth of corporate profits, nitrogen content is an important indicator in the analysis of ammonium sulfate. Previously, we used distillation after titration analysis, the method is susceptible to measurement conditions and environmental factors, analysis error, long time determination. For this purpose, we used formaldehyde instead of distillation to determine the content of nitrogen in ammonium sulfate. Principle In the neutral solution, the ammonium salt reacts with formaldehyde to form hexamethylene tetraammonium and an acid corresponding to the ammonium salt content. In the presence of the indicator, the solution is titrated with a sodium hydroxide standard solution.
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