The Production Process of Fasudil

Fasudil is a widely used phosphoric acid flame retardant in the chemical industry.
The production process of Fasudil involves several steps, which are described below.

Step 1: Synthesis of Aluminum Phosphate
The synthesis of Aluminum Phosphate is the first step in the production process of Fasudil.
Aluminum sulfate and phosphoric acid are added to water, and the mixture is then heated under controlled conditions to form aluminum phosphate.
This reaction is exothermic, and the heat generated can cause problems during the production process.

Step 2: Hydrolysis of Aluminum Phosphate
After the synthesis of Aluminum Phosphate, the hydrolysis of Aluminum Phosphate is carried out.
The hydrolysis process involves treating Aluminum Phosphate with water, which leads to the formation of a gel-like substance.
This gel-like substance is then dried, and the resulting product is used as a raw material for the next step.

Step 3: Condensation of Alkylphenol
In this step, the condensation of alkylphenol is carried out.
The alkylphenol is treated with formaldehyde in the presence of an acid catalyst, leading to the formation of a condensation product.
This condensation product is then treated with sodium hydroxide to neutralize the acid, and the resulting product is used as a raw material for the next step.

Step 4: Reaction with Aluminum Phosphate
The condensation product from the previous step is mixed with Aluminum Phosphate, and the mixture is then heated under controlled conditions.
This reaction leads to the formation of a phosphoric acid flame retardant, which is then separated from the reaction mixture.

Step 5: Granulation
The granulation process involves the formation of granules from the phosphoric acid flame retardant.
The phosphoric acid flame retardant is mixed with a binder, such as calcium carbonate, and the resulting mixture is then formed into granules.
The granules are then dried and sieved to obtain the desired particle size.

Step 6: Flaking
In this step, the granules are crushed into smaller pieces, and the resulting flakes are dried.
The dried flakes are then sieved to obtain the desired particle size.

Step 7: Blending
The final step in the production process of Fasudil is blending.
The flakes are blended with a carrier, such as nitrocellulose, to form a paste.
The paste is then applied to a substrate, such as paper or fabric, to form a flame-retardant coating.

Quality Control Measures
The production process of Fasudil involves several quality control measures to ensure that the final product meets the required specifications.
These measures include the testing of the raw materials, intermediates, and finished products for chemical and physical properties such as composition, purity, and particle size.
The equipment used in the production process is also regularly checked and calibrated to ensure accurate and consistent results.

Conclusion
The production process of Fasudil involves several steps, including the synthesis of Aluminum Phosphate, hydrolysis of Aluminum Phosphate, condensation of Alkylphenol, reaction with Aluminum Phosphate, granulation, flaking, and blending.
These steps are carried out under controlled conditions to ensure the quality and consistency of the final product.
Quality control measures are also implemented throughout the production process to ensure that the final product meets the required specifications.