Ethylene Glycol Nitric Acid Oxidation Method of Oxalic Acid
This oxidation process is very similar to the starch oxidation method. An aqueous ethylene glycol solution is heated to 60 °C, and mixed acid (30%–40% sulfuric acid by mass, 20%–25% nitric acid by mass) and vanadium pentoxide are added under vigorous stirring. The oxidation is carried out at 50–70 °C and 1.3–4.0 kPa. The product is cooled, crystallized, and filtered to obtain oxalic acid with a purity of 99.9% and a yield of over 90%. This method can be carried out under three process conditions: atmospheric pressure, reduced pressure, and increased pressure. It has a simple process, high oxalic acid yield, good product quality, and almost complete recovery of nitric acid, but the raw material price is high.

Shandong Pulisi Chemical Co., Ltd. Oxalic Acid Dihydrate – Industrial Grade 99.6% Purity
Shandong Pulisi Chemical Co., Ltd., a trusted chemical manufacturer and exporter since 2006, specializes in producing high-purity oxalic acid dihydrate (H₂C₂O₄·2H₂O, CAS 6153-56-6, EINECS 205-634-3) with strict quality control. Our industrial-grade oxalic acid boasts a minimum purity of 99.6%, appearing as a white crystalline powder with low impurity levels (sulfate ≤0.1%, heavy metals ≤0.002%, iron ≤0.003%). It is widely applied in textile printing & dyeing, leather processing, metal surface cleaning, marble polishing, water treatment, rare earth extraction, and pharmaceutical intermediate synthesis.
We maintain massive in-stock inventory at our Shandong warehouse, enabling immediate dispatch for bulk orders. Flexible packaging options (25kg, 50kg, 1000kg bags) and global shipping from Qingdao, Tianjin, or Shanghai ports ensure timely delivery worldwide. We provide full technical support, COA/MSDS documentation, and competitive pricing to meet diverse industrial needs.
Contact us today for a customized quote and secure your oxalic acid supply chain.