Production process and production system of 1,3-butanediol

Abstract

The invention provides a production process of 1,3-butanediol. The production process comprises the following steps of firstly feeding an acetaldehyde solution and a catalyst into a micro-channel reactor for performing a condensation reaction, and then adding an acidic substance for regulating a reaction system to be neutral, thereby obtaining an intermediate product; and secondly carrying out a hydrogenation reaction on the intermediate product obtained in the above step to obtain the 1,3-butanediol. By adoption of the production process of the 1,3-butanediol, the selectivity of 3-hydroxybutyraldehyde and the single-pass conversion rate of acetaldehyde in the acetaldehyde condensation reaction process are highly improved, and the selectivity and yield indexes of the 1,3-butanediol as thefinal product are improved; and meanwhile, the production cost of the 1,3-butanediol is lowered and a process route used for producing the 1,3-butanediol and capable of being industrially applied is provided.

Description

technical field

[0001] The invention belongs to the technical field of 1,2-propanediol synthesis, and in particular relates to a production process and a production system of 1,3-butanediol. Background technique

[0002] 1,3-Butanediol, referred to as 1,3-BDO, the molecular formula is C 4 h 10 o 2 , It is a colorless, odorless liquid at room temperature, non-corrosive, with little irritation to the skin, low toxicity, and widely used. 1.3-Butanediol has the characteristics of diol reactivity, odorless, low toxicity, and good water solubility. It is mainly used in organic synthesis. It is the raw material of polyester resin and alkyd resin, the raw material of plasticizer, and polyurethane The raw material of coatings can be made into unsaturated polyester resins, wetting agents and softeners, intermediates of medicines and dyes, surfactants, plasticizers, coupling agents, solvents, etc. Food additive and flavoring agent, it can also be used as moisturizer and softener fo...

Examples

Embodiment 1

[0121] see figure 2 , figure 2 A simplified process flow diagram of the 1,3-butanediol production system provided in Example 1 of the present invention. Wherein, a is an acetaldehyde solution, b is a catalyst, c is an acidic substance, and d is hydrogen; 1, a pipeline reactor; 2, a pipeline neutralization reactor, 3, a hydrogenation reactor, 4, an acetaldehyde removal tower, 5 1. Filtration and separation device, 6. Light component removal rectification tower, 7. Thin film evaporator, 8. Product packing rectification tower.

[0122] Reaction unit: The specification of the pipe reactor is a fixed tube-sheet shell-and-tube reactor with a shell diameter of 159mm, an internal reaction tube of Φ19×2mm, and a length of 10,000mm. The raw materials acetaldehyde and liquid caustic soda are mixed in the pipeline mixer, and react in the reaction tube, and the shell side is fed with a low-temperature aqueous solution of 15°C to keep the reaction temperature not higher than 20°C. Acet...

Embodiment 2

[0135] Response unit: according to figure 2 In the process method shown, the pipeline reactor adopts a casing structure, the inner pipe is a Φ19×2 casing with a length of 18000mm, and low-temperature water is passed into the jacket to control the reaction temperature below 20 degrees. After the raw material acetaldehyde and liquid caustic soda are mixed in the pipeline mixer, they react in the pipeline reactor. The concentration of the raw material acetaldehyde is 40%, the concentration of the lye sodium hydroxide is 0.1%, and the flow rate of the acetaldehyde solution is 1kg / h , the flow rate of lye is 0.05kg / h. The pH value of the material at the outlet of the reactor is detected first, and then 36% acetic acid solution is added dropwise to adjust the pH value of the reaction product to about 7.0.

[0136] Acetaldehyde separation unit: the above-mentioned acetaldehyde-condensed material contains acetaldehyde, 3-hydroxybutyraldehyde, crotonaldehyde, water and other material...

technical field

[0001] The invention belongs to the technical field of 1,2-propanediol synthesis, and in particular relates to a production process and a production system of 1,3-butanediol. Background technique

[0002] 1,3-Butanediol, referred to as 1,3-BDO, the molecular formula is C 4 h 10 o 2 , It is a colorless, odorless liquid at room temperature, non-corrosive, with little irritation to the skin, low toxicity, and widely used. 1.3-Butanediol has the characteristics of diol reactivity, odorless, low toxicity, and good water solubility. It is mainly used in organic synthesis. It is the raw material of polyester resin and alkyd resin, the raw material of plasticizer, and polyurethane The raw material of coatings can be made into unsaturated polyester resins, wetting agents and softeners, intermediates of medicines and dyes, surfactants, plasticizers, coupling agents, solvents, etc. Food additive and flavoring agent, it can also be used as moisturizer and softener fo...

Examples

Embodiment 1

[0121] see figure 2 , figure 2 A simplified process flow diagram of the 1,3-butanediol production system provided in Example 1 of the present invention. Wherein, a is an acetaldehyde solution, b is a catalyst, c is an acidic substance, and d is hydrogen; 1, a pipeline reactor; 2, a pipeline neutralization reactor, 3, a hydrogenation reactor, 4, an acetaldehyde removal tower, 5 1. Filtration and separation device, 6. Light component removal rectification tower, 7. Thin film evaporator, 8. Product packing rectification tower.

[0122] Reaction unit: The specification of the pipe reactor is a fixed tube-sheet shell-and-tube reactor with a shell diameter of 159mm, an internal reaction tube of Φ19×2mm, and a length of 10,000mm. The raw materials acetaldehyde and liquid caustic soda are mixed in the pipeline mixer, and react in the reaction tube, and the shell side is fed with a low-temperature aqueous solution of 15°C to keep the reaction temperature not higher than 20°C. Acet...

Embodiment 2

[0135] Response unit: according to figure 2 In the process method shown, the pipeline reactor adopts a casing structure, the inner pipe is a Φ19×2 casing with a length of 18000mm, and low-temperature water is passed into the jacket to control the reaction temperature below 20 degrees. After the raw material acetaldehyde and liquid caustic soda are mixed in the pipeline mixer, they react in the pipeline reactor. The concentration of the raw material acetaldehyde is 40%, the concentration of the lye sodium hydroxide is 0.1%, and the flow rate of the acetaldehyde solution is 1kg / h , the flow rate of lye is 0.05kg / h. The pH value of the material at the outlet of the reactor is detected first, and then 36% acetic acid solution is added dropwise to adjust the pH value of the reaction product to about 7.0.

[0136] Acetaldehyde separation unit: the above-mentioned acetaldehyde-condensed material contains acetaldehyde, 3-hydroxybutyraldehyde, crotonaldehyde, water and other material...

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