Oxalic Acid

1.Material Overview

Oxalic acid is an organic acid with the chemical formula C₂H₂O₄. It is a colorless crystal at room temperature and is soluble in water and ethanol. In the pharmaceutical field, oxalic acid is used to treat hepatitis, kidney stones, urinary tract infections, and other diseases. In the chemical industry, oxalic acid is used to prepare dyes, pharmaceuticals, plastics, and other chemicals. In the food industry, oxalic acid is used as a food acidifier and preservative to increase the acidity of food, improve its taste, and maintain its freshness.

2.Process Introduction

The drying system uses two-stage vibrating fluidized bed dryer for the drying and cooling of oxalic acid, with two fluidized bed dryers operating in series.

Wet oxalic acid from the vacuum filter is fed into the primary vibrating fluidized bed dryer. Under the combined action of hot air fluidization and motor vibration, the wet oxalic acid moves at high speed and irregularly. At the same time, the material is maintained in fluidization sate by hot air to exchange heat and evaporate moisture. The material then is fed into the secondary vibrating fluidized bed dryer to remove residual moisture and cooling down before being discharged from the dryer.

3. Technical Advantages

1) By utilizing vibration-assisted fluidization, the material is protected from strong airflow impacts, resulting in an extremely low crystal breakage rate. Coupled with uniform air distribution and segmented temperature control, the uniformity of drying is high.

2) Fully enclosed continuous structure, with low heat loss, high thermal efficiency, and no dust spillage.

3) The equipment has a simple and reliable structure. The material residence time can be precisely adjusted by the vibration frequency and the dryer inclination angle. It is easy to maintain and has strong adaptability to working conditions.

4. Technical Benefit

1） Higher product quality

Thanks to the use of low-impact vibration fluidization, the crystals remain intact with reduced dust and stable moisture content. Consequently, both the pass rate of finished products and the utilization rate of raw materials have seen a substantial increase.

2)Lower operating costs

Due to the reduction in fan power consumption caused by fluidization at low wind speeds, the utilization rate of hot air is higher, resulting in significant energy savings. Additionally, the equipment has no complex rotating parts and fewer wearing parts, leading to lower labor and maintenance costs.