[Chemical Knowledge]：Production method and process of ethyl benzoate

Manufacturing Method
of Ethyl Benzoate
Ethyl benzoate is a colorless transparent liquid with fruit flavor, which is widely used in food, medicine, cosmetics and other fields. In the field of raw materials for chemical production, the production methods of ethyl benzoate mainly include esterification, transesterification and reduction. This article will introduce the manufacturing method of esterification in detail.

1. esterification

esterification is a commonly used method for the manufacture of ethyl benzoate, and the main raw materials are benzoic acid and ethanol. The reaction principle is that under the action of acidic catalyst, benzoic acid and ethanol are esterified to produce ethyl benzoate and water.

1. Process
The process flow of
esterification method mainly includes the following steps: ingredients, esterification, distillation, cooling, fractionation and refining.

2. Key points of operation

(1) Ingredients: Benzoic acid and ethanol are added into the reactor according to a certain proportion, and an appropriate amount of acid catalyst is added at the same time.

(2) Esterification: At a certain temperature, the esterification reaction is carried out to generate ethyl benzoate and water.

(3) Distillation: The reaction solution was distilled to separate unreacted ethanol and water.

(4) Cooling: The distilled ethyl benzoate was cooled to room temperature.

(5) Fractionation: The cooled ethyl benzoate is fractionated to obtain a product with higher purity.

(6) Refining: Refining the fractionated ethyl benzoate to further improve the purity and quality of the product.

3. Precautions

(1) In the batching process, the proportion of raw materials and the amount of catalyst should be strictly controlled to ensure the smooth progress of the reaction.

(2) In the esterification reaction, an appropriate temperature and stirring speed should be maintained to promote the reaction.

(3) During the distillation process, attention should be paid to controlling the distillation temperature and pressure to avoid product decomposition and loss.

(4) During the cooling process, the cooling rate should be controlled to avoid crystallization and stratification of the product.

(5) During the fractionation and refining process, attention should be paid to controlling the operating conditions to obtain a higher purity product.

2. Transesterification

Transesterification is a method of manufacturing ethyl benzoate from methyl benzoate and ethanol. The reaction principle is that under the action of acidic catalyst, the transesterification reaction between methyl benzoate and ethanol produces ethyl benzoate and methanol. This method has the advantages of easy availability of raw materials and mild reaction conditions, but the yield is low.

1. Process
The process flow of
ester exchange method mainly includes the following steps: ingredients, ester exchange, distillation, fractionation and refining.

2. Key points of operation

(1) Ingredients: Add methyl benzoate and ethanol into the reactor according to a certain proportion, and add an appropriate amount of acidic catalyst at the same time.

(2) Transesterification: At a certain temperature, the transesterification reaction is carried out to generate ethyl benzoate and methanol.

(3) Distillation: The reaction solution was distilled to separate unreacted methyl benzoate and methanol.

(4) Fractionation: The distilled ethyl benzoate is fractionated to obtain a higher purity product.

(5) Refining: Refining the fractionated ethyl benzoate to further improve the purity and quality of the product.

3. Precautions

(1) In the batching process, the proportion of raw materials and the amount of catalyst should be strictly controlled to ensure the smooth progress of the reaction.

(2) In the transesterification reaction, an appropriate temperature and stirring speed should be maintained to promote the reaction.

(3) During the distillation process, attention should be paid to controlling the distillation temperature and pressure to avoid product decomposition and loss.

(4) During the fractionation and refining process, attention should be paid to controlling the operating conditions to obtain a higher purity product.

3. reduction method

reduction method is a kind of benzoic acid as raw material, through the reduction reaction to produce ethyl benzoate method. This method has the advantages of single raw material and high yield, but the operation is more complicated.

1. Process
The process flow of
reduction method mainly includes the following steps: ingredients, reduction, distillation, fractionation and refining.

2. Key points of operation

(1) Ingredients: Benzoic acid is added into the reactor, and an appropriate amount of reducing agent and catalyst are added at the same time.

(2) Reduction: At a certain temperature, a reduction reaction is carried out to generate ethyl benzoate.

(3) Distillation: The reaction solution was distilled to separate unreacted benzoic acid and the reducing agent.

(4) Fractionation: The distilled ethyl benzoate is fractionated to obtain a higher purity product.

(5) Refining: Refining the fractionated ethyl benzoate to further improve the purity and quality of the product.

3. Precautions

(1) In the batching process, the proportion of raw materials and the amount of catalyst should be strictly controlled to ensure the smooth progress of the reaction.

(2) In the reduction reaction, an appropriate temperature and stirring speed should be maintained to promote the reaction. At the same time, attention should be paid to controlling the amount and addition rate of reducing agent to avoid excessive reduction and formation of by-products.

(3) During the distillation process, attention should be paid to controlling the distillation temperature and pressure to avoid product decomposition and loss. At the same time, attention should be paid to collecting unreacted benzoic acid and reducing agent for recycling.

(4) During the fractionation and refining process, attention should be paid to controlling the operating conditions to obtain a higher purity product. At the same time, attention should be paid to the maintenance and maintenance of the equipment to ensure the normal operation and service life of the equipment.