Dilute phosphoric acid solution distribution device for hydrogen peroxide production

Abstract

The invention relates to a dilute phosphoric acid solution distribution device for hydrogen peroxide production. The distribution device consists of a concentrated phosphoric acid storage tank, a concentrated phosphoric acid pump and a dilute phosphoric acid preparation tank. The concentrated phosphoric acid pump is provided with an inlet valve, an outlet valve and a by-pass valve. The top of the dilute phosphoric acid preparation tank is in connection with a pure water valve and an air valve respectively, the bottom is provided with a perforated round air distribution pipe, the dilute phosphoric acid preparation tank outlet pipeline is connected to a working solution storage tank through a fast acid adding valve, the dilute phosphoric acid preparation tank outlet pipeline is in connection with a hydrogenation liquid pump inlet pipeline through a front acid adding valve and acid adding sight glass, the dilute phosphoric acid preparation tank outlet pipeline is connected to an acid water mixer on a pure water pipeline through a dilute acid intermediate valve, a dilute acid intermediate tank and a dilute acid metering pump, and the dilute phosphoric acid preparation tank outlet pipeline is connected to a preparation kettle through a preparation acid adding valve. The dilute phosphoric acid solution distribution device provided by the invention can be applied to dilute phosphoric acid solution preparation and use in hydrogen peroxide production, effectively acoids direct contact of the operation staff with phosphoric acid, improves the automation degree of acid preparation and acid use process, and is conducive to safe and stable operation of the device.

Description

technical field [0001] The invention belongs to the technical field of chemical solution preparation and use, and in particular relates to the preparation of dilute phosphoric acid solution in hydrogen peroxide production and its use in acid addition to pure water, acid addition to hydrogenation reaction working fluid, acid addition to storage tanks, and acid addition to preparation tanks. s installation. Background technique [0002] In the production of hydrogen peroxide, it is necessary to add dilute phosphoric acid (mass fraction 40%~50%) at different positions to make the system acidic to prevent hydrogen peroxide from being decomposed by alkali and causing accidents, such as hydrogenation liquid before entering the oxidation tower, pure water before entering the extraction tower, Dilute phosphoric acid must be added during cleaning of the working fluid, when the temperature of the storage tank of the hydrogenation working fluid or oxidation working fluid rises sharply,...

AI Technical Summary

Problems solved by technology

At present, it is generally adopted to set up a small-volume high-level tank in the acid-using part, transfer phosphoric acid to the high-level tank through a small bucket, and then add pure water to prepare the acid. Frequent preparation is required, and the operation is labor-intensive and has certain risks.

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