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Purification method for butyl acrylate crude product

The technology of a butyl acrylate and a purification method is applied in the field of purification of crude butyl acrylate products, and can solve the problems of high price, difficulty in large-scale industrial production, complicated processes, etc., and achieves the reduction of dosage, shortening of washing link time, and saving. effect used

Active Publication Date: 2015-07-08
PINGHU PETROCHEM
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Problems solved by technology

The main disadvantages of this method are: polyol and water are selected as the extraction agent, the extraction phase is rectified and separated to obtain the polyol, the process is cumbersome, a large amount of organic solvent is used in the extraction process, the price is expensive, and it is not easy for large-scale industrial production

Method used

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  • Purification method for butyl acrylate crude product

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Embodiment 1

[0026] Embodiment 1 A kind of purification method of butyl acrylate crude product, its process flow diagram is as figure 1 As shown, it specifically includes the following steps:

[0027] 1) extraction

[0028] With desalinated water as extraction agent, the crude product of butyl acrylate enters the extraction tower C1 with an average flow rate of 10000kg / h and carries out continuous countercurrent extraction in the extraction tower C1; the organic acid catalyst in the crude product of butyl acrylate enters the water phase, and The desalinated water is countercurrently contacted to recover the organic acid catalyst in the water phase, and the recovered organic acid catalyst is sent back to the reactor from the bottom of the extraction tower C1; butyl acrylate and by-products enter the raffinate organic phase, and are collected from the top of the extraction tower C1 Outflow, continuously enter the static mixer M1;

[0029] The by-products in the described butyl acrylate cru...

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Abstract

The invention discloses a purification method for a butyl acrylate crude product. The purification method comprises the following steps: with water as an extractant, carrying out continuous counter-current extraction on the butyl acrylate crude product, adequately mixing an extraction raffinate organic phase containing the butyl acrylate crude product with caustic soda liquid in a static mixer to have a neutralization reaction, discharging the separated salts, then removing impurities, light components and heavy components, and finally obtaining butyl acrylate with purity of 99.6% or above. The purification process disclosed by the invention is simple, the purity of butyl acrylate is high, and a one-pass yield can reach 98.5% or above; compared with the traditional process, the method disclosed by the invention has the advantages that 20% of the caustic soda liquid is saved averagely in the production of one ton of the butyl acrylate product, and the influence of neutralization and washing links on the purification system is reduced to the minimum. The purification method is remarkable in practicability and economic benefits and can be put into large-scale industrialized production easily.

Description

technical field [0001] The invention belongs to the field of butyl acrylate production, in particular to a method for purifying crude butyl acrylate. Background technique [0002] As the main monomers of polymer emulsions, adhesives, pressure-sensitive adhesives, water-absorbent resins and other products, acrylates are favored in the chemical market. Butyl acrylate (BA) is the most important variety of acrylates. In the existing continuous production process, the direct esterification method of butyl acrylate is the main production method in the world at this stage. The main process flow is: raw material acrylic acid and normal Butanol is esterified in two series reactors, using organic acid as a catalyst, and adopts the method of dehydration while reacting, so that the reversible esterification equilibrium reaction can be carried out in the direction of butyl ester formation as far as possible. The crude butyl acrylate product discharged from the reactor enters the extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/48
CPCC07C67/48C07C69/54
Inventor 张兴兴范昌海贾红军陈玉丰杨卫东向永前屠亚
Owner PINGHU PETROCHEM
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