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[Chemical Knowledge]：Production method and process of dimethyl phthalate

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Dimethyl phthalate (Dimethyl Phthalate, referred to as DMP) is a commonly used chemical production raw materials, widely used in plastics, solvents, spices and other fields. This article will introduce the manufacturing method of dimethyl phthalate in detail, including raw material preparation, esterification reaction, distillation purification and other steps, aiming to provide readers with comprehensive production process guidance.

1. Raw Material Preparation

The following raw materials need to be prepared for the production of dimethyl phthalate: phthalic acid (Phthalic Acid, abbreviation PA), methanol (Methanol acid, abbreviation MeOH) and catalyst sulfuric acid (Sulfuric Acid).

2. Esterification Reaction

1. Phthalic acid and methanol are added into an esterification reactor according to a certain molar ratio. Generally, the molar ratio of phthalic acid to methanol is 1:2-3.
2. Add an appropriate amount of sulfuric acid as a catalyst, the amount of sulfuric acid is generally 1-3% of the quality of phthalic acid.
3. At a certain temperature, the esterification reaction. The reaction temperature is generally controlled at 180-220°C and the reaction time is about 4-6 hours. During this time, constant stirring is required to ensure a homogeneous reaction. Purification of

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3. Distillation 1. After the esterification reaction is completed, the reaction solution is cooled to room temperature, and then an appropriate amount of alkaline absorbent is added to neutralize the remaining sulfuric acid.
2. The neutralized reaction solution is distilled to separate dimethyl phthalate and methanol. The temperature and pressure should be controlled during the distillation process to ensure the purity of the product.
3. A fraction of dimethyl phthalate is collected and further cooled to solidify to obtain a dimethyl phthalate product.
Precautions for
4.

1. During the esterification reaction, it is necessary to strictly control the temperature and time to avoid deepening the color of the product and affecting the yield.
2. In the process of distillation, it is necessary to ensure good tightness of the equipment to prevent the pollution of the environment caused by methanol volatilization.
3. In the production process, safety protection measures should be taken to avoid harm to human body caused by raw materials and products.

5. environmental protection and sustainable development

With the increasing concern of the society for environmental protection and sustainable development, the production of dimethyl phthalate also needs to consider environmental factors. In the production process, effective measures should be taken to reduce exhaust gas emissions, improve the utilization rate of raw materials, and reduce energy consumption to reduce the impact on the environment. In addition, the waste generated in the production process should be treated and recycled reasonably to realize the effective use of resources.

6. Quality Control and Testing

In order to ensure the quality of dimethyl phthalate products, strict quality control and testing of raw materials, semi-finished products and finished products are required during the production process. By testing the purity, color, acidity and other indicators of the product, to ensure that the product meets the relevant standards and regulations. At the same time, the abnormal situation in the production process should be analyzed and dealt with in time to prevent the occurrence of product quality problems.

summary:

dimethyl phthalate as an important chemical production raw material, its manufacturing method involves raw material preparation, esterification reaction, distillation purification and other links. In the production process, it is necessary to strictly control the process parameters of each link to ensure product quality and production safety. At the same time, we also need to pay attention to environmental protection and sustainable development, and improve the environmental protection and economy of the production process. Through the introduction of this article, I hope to provide readers with useful reference and guidance, and promote the healthy development of the phthalate manufacturing industry.

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