Manufacturing method of potassium oxalate
I. Introduction
Potassium oxalate is an important raw material for the production of chemicals, which is widely used in many fields such as medicine, food, printing and dyeing. In this paper, the manufacturing method of potassium oxalate will be introduced in detail, including raw material preparation, reaction process, post-treatment and precautions.
II. Raw material preparation
1. Oxalic acid: oxalic acid is the main raw material for the preparation of potassium oxalate, and oxalic acid with high purity and low water content should be selected to ensure the quality of products.
2. Potassium hydroxide: Potassium hydroxide is used as alkali source to react with oxalic acid to produce potassium oxalate.
3. Water: For dissolving raw materials and washing products, deionized or distilled water should be used to avoid introducing impurities.
3. Reaction process
1. Dissolve oxalic acid: add oxalic acid into the reactor, add appropriate amount of water and stir to dissolve, get oxalic acid solution.
2. Add potassium hydroxide: Dissolve potassium hydroxide in water and slowly add it into oxalic acid solution while stirring to make the two react fully.
3. Control pH: control the pH of the reaction system within a suitable range by adding potassium hydroxide solution dropwise to ensure the production of potassium oxalate.
4. Heating reaction: Heat the reactor at appropriate temperature to promote the reaction. Meanwhile, the reaction temperature needs to be controlled to avoid decomposition of potassium oxalate.
4. Post-treatment
1. Filtration: After the reaction, filter to remove unreacted solid impurities.
2. Washing: Wash the filter cake with a small amount of water to recover unreacted oxalic acid and potassium oxalate.
3. Drying: The filtrate and washings were combined and concentrated by evaporation to obtain potassium oxalate crystals. Dry the crystals to obtain the final potassium oxalate product.
V. Precautions
1. Control the reaction temperature: Potassium oxalate is easy to decompose at high temperature, so it is necessary to control the reaction temperature within a suitable range.
2. Control pH value: pH value has an important influence on the generation and stability of potassium oxalate, so it is necessary to strictly control the pH value within the appropriate range.
3. Avoid introduction of impurities: In the process of raw material preparation and post-treatment, the introduction of impurities should be avoided to ensure product quality.
6. Conclusion
The manufacturing method of potassium oxalate includes the steps of raw material preparation, reaction process and post-treatment. During the preparation process, parameters such as reaction temperature and pH value need to be strictly controlled to avoid introducing impurities to ensure product quality. Through the manufacturing method introduced in this paper, potassium oxalate products with high purity and good stability can be prepared to provide high-quality raw materials for the production of chemicals.
