The process of preparing ferrous fumarate using sodium carbonate and fumaric acid mainly includes the following steps:

Ⅰ. Raw Material Preparation

Fumaric Acid: Serves as the primary acid source for the reaction.

Sodium Carbonate: Used to adjust the acidity and alkalinity of the reaction system and to react with fumaric acid to generate corresponding salts.

Ferrous Sulfate Heptahydrate: Provides ferrous ions to react with fumaric acid to produce ferrous fumarate.

Sodium Bisulfite (optional): Acts as a reducing agent to prevent the oxidation of ferrous ions during the reaction, ensuring product purity and stability.

Ⅱ.Reaction Process

1. Mixing and Heating:

·Place fumaric acid and sodium carbonate in a reaction vessel (such as an enamel reactor) and heat to a certain temperature (e.g., 80°C), while stirring to ensure uniform mixing.

·Heat ferrous sulfate heptahydrate, sodium bisulfite (if used), and water to an appropriate temperature (e.g., 60-80°C) and then slowly add to the reaction vessel.

2. Reaction Condition Control:

·Maintain the temperature in the reactor between 60-80°C and adjust the stirring speed as needed.

Adjust the pH of the reaction system to a suitable range (e.g., 8.5-9.5) by adding an appropriate amount of ammonia solution or other alkaline solutions.

3. Completion and Post-Treatment:

·After the reaction is complete (which can be monitored by detecting the concentration of ferrous ions), centrifuge the reaction mixture to remove excess moisture and impurities.

·Dry the wet material obtained from centrifugation using methods such as vacuum drying or oven drying to eliminate residual moisture.

·Grind and sieve the dried material to obtain the desired ferrous fumarate product, typically controlling the particle size within a specific range (e.g., passing through an 80 mesh sieve).

Ⅲ.Process Optimization and Precautions

·Nitrogen Protection: To prevent the oxidation of ferrous ions during the reaction, introduce nitrogen gas into the reactor for protection.

·Purity Control: Strictly control the purity of raw materials and reaction conditions to ensure the final product's purity and stability.

·Safety Production: Pay attention to safety during operations, following relevant operational procedures and safety regulations to prevent accidents.

By following these steps, ferrous fumarate can be efficiently prepared using sodium carbonate and fumaric acid. In practical production, adjustments and optimizations of process parameters may be necessary based on specific conditions to achieve the ultimate production effect.