Method for preparing anhydrous oxalic acid from oxalic acid and production device using method

Abstract

The invention relates to a method for preparing anhydrous oxalic acid from oxalic acid and a production method using the method. The method includes the steps of placing the oxalic acid in a closed container, heating, maintaining the temperature which rises to 50-60 DEG C for 55-65 minutes, continuing heating, and maintaining the temperature which rises to 101-105 DEG C for 10-15 minutes. The production device comprises a hot air chamber (2) fixedly connected above a support (1). A drying chamber (5) is fixedly connected to the upper end of the hot air chamber. Inclined porous boards (9) are disposed in the drying chamber. A multi-orifice board (10) is disposed above the inclined porous boards. Filter bags (11) are connected to the multi-orifice board. The top end of the drying chamber is provided with an air outlet (4) above the multi-porous board. By the aid of the production device and the preparation method, drying of the anhydrous oxalic acid is more accurate and scientific, and the dried anhydrous oxalic acid is purer, pollution-free and emission-free, and meets the requirement on environment friendliness.

Description

technical field [0001] The invention relates to a method for preparing anhydrous oxalic acid from oxalic acid. [0002] The invention also relates to a production device for preparing anhydrous oxalic acid. Background technique [0003] Oxalic acid, oxalic acid, is one of the simplest organic dibasic acids. It is generally colorless and transparent crystal, oxalic acid plays an important role in industry, and oxalic acid can remove rust. Anhydrous oxalic acid is obtained by drying common industrial oxalic acid to remove the surface moisture and crystal crystal moisture. The existing method for preparing anhydrous oxalic acid is to use dry frying in a reactor, oven drying, and external discharge type vibrating fluidized bed to produce and process anhydrous oxalic acid. The yield is low, the output is small, the energy consumption is high, and the product quality fluctuates greatly. , It is easy to cause environmental pollution, and it is not suitable for personnel to work ...

AI Technical Summary

Problems solved by technology

The existing method for preparing anhydrous oxalic acid is to use dry frying in a reactor, oven drying, and external discharge type vibrating fluidized bed to produce and process anhydrous oxalic acid. The yield is low, the output is small, the energy consumption is high, and the product quality fluctuates greatly. , It is easy to cause environmental pollution, and it is not suitable for personnel to work on site for a long time

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