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[Chemical Knowledge]：Production and manufacturing method and process flow of phthalic acid

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Phthalic acid (Phthalic Acid) is an important organic chemical raw material, which is widely used in plastics, dyes, pharmaceuticals, pesticides and other fields. This article will introduce the manufacturing method of phthalic acid, including raw materials, process flow, operation points and so on.

1. raw material

phthalic acid manufacturing raw materials are mainly phthalic anhydride (Phthalic Anhydride) and alkali. Among them, phthalic anhydride can be obtained by benzene oxidation method, and alkali can use sodium hydroxide or potassium hydroxide and other strong alkali.

2. Process
There are two main manufacturing processes for
phthalic acid: acid solution and alkali solution. Among them, the acid solution method is widely used, the following acid solution method as an example to introduce the manufacturing process of phthalic acid.

1. Ingredient

Phthalic anhydride and concentrated sulfuric acid are added into the batching tank according to a certain proportion and stirred evenly.

2. Acidolysis

The mixture in the batching tank is pumped into the acidolysis device, and the acidolysis reaction is carried out at a certain temperature and pressure to generate phthalic acid and sulfuric acid.

3. Crystallization

The reaction solution in the acidolysis device is pumped into a crystallizer, and crystallization is cooled to obtain phthalic acid crystals.

4. Centrifugal Separation

The crystals in the crystallizer were pumped into a centrifuge and centrifuged to obtain phthalic acid solid and mother liquor.

5. Washing

The phthalic acid solid was washed with pure water to remove surface impurities.

6. Drying

The washed phthalic acid solid is sent to a dryer for drying to obtain a final phthalic acid product.

3. operation points

1. Control the reaction temperature and pressure to ensure the smooth progress of the acidolysis reaction.

2. Control the crystallization temperature and cooling rate to obtain phthalic acid crystals with uniform particle size and high purity.

3. It is necessary to control the centrifugal speed and time during centrifugal separation to avoid crystal breakage and mother liquor residue.

4. During the washing and drying process, it is necessary to control parameters such as water temperature, washing time and drying temperature to ensure product quality.

4. safety production and environmental protection requirements

1. In the production process, it is necessary to strictly abide by the safety production regulations to ensure the safety of employees and equipment.

2. The waste gas, waste water and solid waste and other pollutants need to be treated and disposed to meet environmental protection requirements. Summary and Prospect of

5.

As an important organic chemical raw material, phthalic acid has a wide range of applications in plastics, dyes, pharmaceuticals and other fields. This paper introduces the process flow and operation points of phthalic acid production by acid hydrolysis with phthalic anhydride and concentrated sulfuric acid as raw materials. In the actual production process, it is necessary to strictly control the parameters to ensure product quality and production safety. At the same time, also need to pay attention to environmental protection requirements to take effective measures to reduce the impact of production on the environment. Looking to the future, with the progress of science and technology and the expansion of application fields, the production process and product quality of phthalic acid are expected to be further improved.

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