Device for continuously producing dibutyl carbonate

Abstract

The utility model discloses a device for continuously producing dibutyl carbonate. The device comprises a reactive distillation tower, a reactive distillation tower reboiler, a reactive distillation tower condenser, a reactive distillation tower reflux tank, a reactive distillation tower reflux pump, a reactive distillation tower kettle pump, a falling film evaporation system, a refining tower, a refining tower reboiler, a refining tower condenser, a refining tower reflux tank, a refining tower reflux pump, a product tank and a vacuum system. The method is high in continuous degree, and fully continuous production of dibutyl carbonate is realized.

Description

Technical Field

[0001] The utility model belongs to the field of fine chemical industry, and relates to a device for continuously producing dibutyl carbonate, which is applicable to the device for producing dibutyl carbonate by the transesterification method. Background Art

[0002] Dibutyl carbonate (abbreviated as DBC) is an organic compound with unique chemical properties and a wide range of application fields. It plays an important role as a solvent, raw material and substitute in the chemical industry. Dibutyl carbonate has high stability and heat resistance, and can react under high temperature conditions without easy decomposition. Dibutyl carbonate has a high solubility, can dissolve a variety of organic solvents, and has low toxicity. It belongs to a green chemical product and can be used as an excellent organic solvent in the chemical and medical fields. It can effectively dissolve solid pigments and resins, making coatings and inks have good fluidity and adhesion. It is also used as a plasticizer for plastics, which can improve the softness, flexibility and low-temperature resistance of plastics. Dibutyl carbonate has an aromatic smell and can be used as a fragrance additive. In addition, dibutyl carbonate can also be used as a raw material for synthetic polymer materials. It can react with a variety of monomers, such as alcohols, acids and amines, etc., to form polymers through polymerization reactions. These polymers have good mechanical properties, chemical resistance and heat resistance, and are widely used in fields such as plastics, fibers and coatings.

[0003] At present, the main method for producing dibutyl carbonate is the batch method. After the raw materials react in the reaction kettle, the crude dibutyl carbonate is obtained, and then the crude product is subjected to batch distillation to obtain a qualified product. This production method has cumbersome operations, a long production cycle and a small production scale. Summary of the Invention

[0004] The purpose of the utility model is to provide a device for continuously producing dibutyl carbonate to realize the continuous production of dibutyl carbonate. The raw materials dimethyl carbonate, n-butanol and catalyst directly enter the reactive distillation column for reactive distillation. The light components are condensed by the condenser of the reactive distillation column and then enter the reflux tank. Part of them is refluxed through the reflux pump and part goes to the tank farm. The bottom material of the column is transported to the falling film evaporation system by the bottom pump of the column. The separated catalyst returns to the reactive distillation column to continue to participate in the reaction. The crude dibutyl carbonate enters the refining column for vacuum distillation to obtain a qualified product. The residue at the bottom of the refining column is regularly discharged through the bottom pump of the refining column. The process flow is continuous, realizing the recycling of the catalyst, reducing the production cost and increasing the economic benefit.

[0005] To achieve the above object, the technical solution adopted by the present utility model is as follows: A device for continuously producing dibutyl carbonate, comprising a reactive distillation column, a reactive distillation column reboiler, a reactive distillation column condenser, a reactive distillation column reflux drum, a reactive distillation column reflux pump, a reactive distillation column bottom pump, a falling film evaporation system, a refining column, a refining column bottom pump, a refining column reboiler, a refining column condenser, a refining column reflux drum, a refining column reflux pump, a product tank, and a vacuum system; characterized in that: the top of the reactive distillation column is connected to the reactive distillation column condenser, the reactive distillation column condenser is connected to the reactive distillation column reflux drum, the reactive distillation column reflux drum is connected to the inlet of the reactive distillation column reflux pump, the outlet of the reactive distillation column reflux pump is respectively connected to the reactive distillation column and the tank farm, the bottom of the reactive distillation column is connected to the inlet of the reactive distillation column bottom pump, the outlet of the reactive distillation column bottom pump is connected to the falling film evaporation system, the falling film evaporation system is respectively connected to the reactive distillation column and the refining column, the top of the refining column is connected to the refining column condenser, the refining column condenser is respectively connected to the vacuum system and the refining column reflux drum, the refining column reflux drum is connected to the inlet of the refining column reflux pump, the outlet of the refining column reflux pump is respectively connected to the refining column and the product tank, and the refining column bottom pump is connected to the bottom of the refining column.

[0006] The reboilers of the reactive distillation column and the refining column are thermosyphon reboilers, which have a high vaporization rate and good fractionation effect, and are simple in structure and convenient for maintenance.

[0007] The feed inlets for dimethyl carbonate, n-butanol and catalyst are at the 1st - 4th trays of the reactive distillation column. This feeding method couples the reaction process with the distillation process, improves production efficiency, simplifies the production process, and reduces production costs.

[0008] The bottom material of the reactive distillation column passes through the falling film evaporation system to separate and recover the catalyst, and the recovered catalyst is returned to the reactive distillation column for recycling, realizing the recycling of the catalyst and reducing production costs.

[0009] The crude dibutyl carbonate contains 90% - 99.5% of dibutyl carbonate, and the product with a content ≥ 99.5% is obtained after vacuum distillation in the refining column.

[0010] The present utility model has the following advantages:

[0011] (1) This device is a continuous production device with high production efficiency;

[0012] (2) The catalyst is recycled, reducing production costs;

[0013] (3) The product yield is greatly improved, increasing economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the device of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present utility model will be further described below in conjunction with embodiments. The following embodiments are intended to illustrate the present utility model rather than limit it.

[0016] A device for continuously producing dibutyl carbonate, comprising a reactive distillation column, a reactive distillation column reboiler, a reactive distillation column condenser, a reactive distillation column reflux drum, a reactive distillation column reflux pump, a reactive distillation column bottom pump, a falling film evaporation system, a refining column, a refining column bottom pump, a refining column reboiler, a refining column condenser, a refining column reflux drum, a refining column reflux pump, a product tank, and a vacuum system; characterized in that: the top of the reactive distillation column is connected to the reactive distillation column condenser, the reactive distillation column condenser is connected to the reactive distillation column reflux drum, the reactive distillation column reflux drum is connected to the inlet of the reactive distillation column reflux pump, the outlet of the reactive distillation column reflux pump is respectively connected to the reactive distillation column and the tank farm, the bottom of the reactive distillation column is connected to the inlet of the reactive distillation column bottom pump, the outlet of the reactive distillation column bottom pump is connected to the falling film evaporation system, the falling film evaporation system is respectively connected to the reactive distillation column and the refining column, the top of the refining column is connected to the refining column condenser, the refining column condenser is respectively connected to the vacuum system and the refining column reflux drum, the refining column reflux drum is connected to the inlet of the refining column reflux pump, the outlet of the refining column reflux pump is respectively connected to the refining column and the product tank, and the refining column bottom pump is connected to the bottom of the refining column.

[0017] The reactive distillation column reboiler and the refining column reboiler are thermosyphon reboilers. Dimethyl carbonate, n-butanol and a catalyst are fed between the 1st and 2nd trays of the reactive distillation column. The light components are condensed by the reactive distillation column condenser and enter the reflux drum (reflux ratio 2:1, reflux temperature controlled at 40 - 50 °C). The liquid in the reflux drum is partly refluxed and partly sent to the tank farm through the reflux pump. The bottom material is transported to the falling film evaporation system by the bottom pump (pressure controlled within 10 kpaA). The separated catalyst returns to the reactive distillation column to continue participating in the reaction. The crude dibutyl carbonate (dibutyl carbonate content ≥ 95%) enters the refining column for vacuum distillation (pressure controlled within 10 kpaA, reflux ratio 3:1, reflux temperature controlled at 50 - 60 °C) to obtain a qualified product with a dimethyl carbonate product content ≥ 99.9%.

[0018] The above embodiments are only one implementation form of the present utility model. Other variations according to the solutions provided by the present utility model, adding or reducing components and steps therein, or applying the present utility model to technical fields similar to the present utility model all fall within the protection scope of the present utility model.

Claims

1. A device for continuously producing dibutyl carbonate, comprising a reaction distillation tower, a reaction distillation tower reboiler, a reaction distillation tower condenser, a reaction distillation tower reflux tank, a reaction distillation tower reflux pump, a reaction distillation tower kettle pump, a falling film evaporation system, a refining tower, a refining tower kettle pump, a refining tower reboiler, a refining tower condenser, a refining tower reflux tank, a refining tower reflux pump, a product tank, and a vacuum system; characterized in that: The top of the reaction distillation tower is connected to the condenser of the reaction distillation tower, the condenser of the reaction distillation tower is connected to the reflux tank of the reaction distillation tower, the reflux tank of the reaction distillation tower is connected to the inlet of the reflux pump of the reaction distillation tower, the outlet of the reflux pump of the reaction distillation tower is respectively connected to the reaction distillation tower and the tank area, the kettle of the reaction distillation tower is connected to the inlet of the kettle pump of the reaction distillation tower, the outlet of the kettle pump of the reaction distillation tower is connected to the falling film evaporation system, the falling film evaporation system is respectively connected to the reaction distillation tower and the refining tower, the top of the refining tower is connected to the condenser of the refining tower, the condenser of the refining tower is respectively connected to the vacuum system and the reflux tank of the refining tower, the reflux tank of the refining tower is connected to the inlet of the reflux pump of the refining tower, the outlet of the reflux pump of the refining tower is respectively connected to the refining tower and the product tank, and the kettle pump of the refining tower is connected to the kettle of the refining tower.

2. A device for continuously producing dibutyl carbonate according to claim 1, characterized in that The reboilers of the reaction distillation tower and the refining tower are thermal syphon reboilers.

3. A device for continuously producing dibutyl carbonate according to claim 1, characterized in that The feed inlets for dimethyl carbonate, n-butanol and catalyst are located at the 1st to 4th plates of the reaction distillation tower.

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