Acrylic acid recombination and depolymerization system

Abstract

The utility model discloses an acrylic acid recombination and depolymerization system which comprises a depolymerization reaction kettle, a third condenser, a catalyst solution tank, a polymerization inhibitor solution tank, a diluent solution tank, a receiving tank, a second rectifying tower and a fourth condenser, the pretreatment device is introduced, reactants are separated and purified, the influence of impurities in the depolymerization reaction is reduced, and the production efficiency and the product conversion rate of the depolymerization reaction are improved by introducing equipment such as the polymerization inhibitor solution tank, the catalyst solution tank and the diluent solution tank; equipment such as a second rectifying tower is introduced, so that the purity of the product is further improved; by introducing a residual liquid collecting kettle, an incinerator and an emptying catcher, the problem of three wastes generated by a depolymerization reaction is preliminarily solved.

Description

Technical Field

[0001] The utility model relates to the technical field of acrylic acid ester cracking engineering, in particular to an acrylic acid recombination and decomposition polymerization system. Background Art

[0002] The main components of acrylic acid recombinant are acrylic acid, acrylic acid dimer, butanol, butyl acrylate, and butyl butoxypropionate. After the butyl acrylate and butyl butoxypropionate are mixed and depolymerized, acrylic acid dimer can be converted into acrylic acid, and butyl butoxypropionate can be converted into butanol and butyl acrylate.

[0003] Existing technologies for the depolymerization and recovery of butyl acrylate dimer are incomplete. The heavy components of acrylic acid contain numerous impurities, including acetic acid, maleic anhydride, furfural, benzaldehyde, and p-methoxyphenol. The associated equipment and purification and separation processes are insufficient to allow the acrylic acid obtained from the depolymerization of butyl acrylate dimer to be used in the production of butyl acrylate. Furthermore, the depolymerization process presents complex environmental challenges that must be addressed. Utility Model Content

[0004] The purpose of the utility model is to provide an acrylic acid recombination and depolymerization system to improve the depolymerization efficiency of acrylic acid heavy components, further separate and purify the products, and treat the three wastes generated by the acrylic acid recombination and depolymerization reaction;

[0005] To achieve the above-mentioned object, the utility model provides a technical solution: a depolymerization system for acrylic acid heavy components, comprising a depolymerization reactor, a third condenser, a catalyst solution tank, an inhibitor solution tank, a diluent solution tank, a receiving tank, a second distillation tower, and a fourth condenser. The depolymerization reactor is connected to the third condenser, and the depolymerization reactor is also connected to the catalyst solution tank, the inhibitor solution tank, and the diluent solution tank. The third condenser is also sequentially connected to the receiving tank, the second distillation tower, the fourth condenser, and the product tank.

[0006] In order to improve the depolymerization efficiency of acrylic acid heavy components, the technical solution provided by the utility model includes: adding a pretreatment device, the pretreatment device is connected to the depolymerization reactor, and the pretreatment device includes: a heavy component solution tank, a heater, a first distillation tower, a first condenser, a fractional distillation tower, and a second condenser connected in sequence, and the second condenser is connected to the depolymerization reactor.

[0007] In order to treat the wastewater generated during the recombination and depolymerization of acrylic acid, the technical solution provided by the utility model includes: a residual liquid collection kettle is further provided, and the depolymerization reaction kettle is connected to the residual liquid collection kettle.

[0008] Furthermore, the first distillation tower is connected to a residual liquid collecting kettle.

[0009] Furthermore, the fractional distillation tower is connected to a residual liquid collecting kettle.

[0010] Furthermore, the second distillation tower is connected to a residual liquid collecting kettle.

[0011] In order to treat the solid waste generated during the recombination and decomposition of acrylic acid, the technical solution provided by the utility model includes: an incinerator is further provided, and the incinerator is connected to the residual liquid collection kettle.

[0012] In order to treat the waste gas generated during the recombination and decomposition of acrylic acid, the technical solution provided by the utility model includes: a venting collector is further provided, and the venting collector is connected to the incinerator.

[0013] Furthermore, the first distillation tower is connected to a vent trap.

[0014] Furthermore, the fractional distillation tower is connected to a vent trap.

[0015] Furthermore, the second distillation tower is connected to a vent trap.

[0016] Furthermore, the vent trap is connected to a collection tank.

[0017] The advantages and beneficial effects of the utility model are as follows: the impurities in the acrylic acid recombinant component are separated and purified before the reaction by the pre-treatment device, thereby effectively reducing the influence of the impurities on the production process and the product quality; the efficiency of the acrylic acid recombinant decomposition polymerization and the product yield are improved by adding an inhibitor solution tank, a diluent solution tank and a catalyst solution tank; and the treatment of the three wastes in the acrylic acid recombinant decomposition polymerization production process is achieved by adding a residual liquid collection kettle, an incinerator and a venting trap. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This utility model provides an acrylic acid recombination and decomposition polymerization system;

[0019] Figure numerals: 1-heavy component solution tank, 2-first distillation tower, 3-first condenser, 4-fractional distillation tower, 5-second condenser, 6-depolymerization reactor, 7-inhibitor solution tank, 8-diluent solution tank, 9-catalyst solution tank, 10-third condenser, 11-receiving tank, 12-second distillation tower, 13-fourth condenser, 14-product tank, 15-residue collection tank, 16-incinerator, 17-venting trap, 18-collecting tank, 19-heater. DETAILED DESCRIPTION

[0020] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] A depolymerization system for acrylic acid heavy components, comprising a depolymerization reactor 6, an inhibitor solution tank 7, a diluent solution tank 8, a catalyst solution tank 9, a third condenser 10, a receiving tank 11 and a product tank 14; the depolymerization reactor 6 is connected to the inhibitor solution tank 7, the diluent solution tank 8, the catalyst solution tank 9, the depolymerization reactor 6 is further connected to the third condenser 10, the third condenser 10 is connected to the receiving tank 11, the receiving tank 11 is connected to the product tank 14 via a second distillation tower 12 and a fourth condenser 13; a pre-treatment device is also provided, the pre-treatment device comprising: a heavy component solution The tank 1, the heater 19, the first distillation tower 2, the first condenser 3, the fractional distillation tower 4 and the second condenser 5 are connected in sequence, and the second condenser 5 is further connected to the depolymerization reactor 6; a residual liquid collection kettle 15, an incinerator 16, and a venting trap 17 are also provided, which are connected in sequence, and the depolymerization reactor 6 is connected to the residual liquid collection kettle 15; the gas phase outlets of the first distillation tower 2, the fractional distillation tower 4 and the second distillation tower 12 are also connected to the venting trap 17, and the liquid phase outlets of the first distillation tower 2, the fractional distillation tower 4 and the second distillation tower 12 are also connected to the residual liquid collection kettle 15.

[0022] The function of the vent trap 17 is to cool the gas phase that cannot be cooled in the condenser through a refrigerant with a lower temperature. Two types of materials will be output. The condensed liquid can be collected and reused, so the vent trap 17 is also connected to the collection tank 18 for collection and recycling. The gas that cannot be cooled will enter the incinerator 16 for incineration.

[0023] A large amount of high-viscosity liquid is stored in the heavy component solution tank 1, which needs to be heated into steam by the heater 19 to avoid clogging the first distillation tower 2. The high-viscosity liquid also contains substances such as acetic acid, maleic anhydride, furfural, benzaldehyde, and p-methoxyphenol. Among them, acetic acid, maleic anhydride, etc. can be separated by the first distillation tower 2, but the boiling points of furfural and benzaldehyde are relatively close to those of butyl acrylate dimer. The effect of direct separation by the first distillation tower is limited. Furfural and benzaldehyde can be separated and removed by further separation and purification through the graded distillation tower 4.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, making several improvements and modifications without departing from the technical principles of the present invention should also be regarded as within the scope of protection of the present invention.

Claims

1. An acrylic acid recombination and depolymerization system, comprising a depolymerization reactor, a third condenser, a catalyst solution tank, an inhibitor solution tank, a diluent solution tank, a receiving tank, a second distillation tower, and a fourth condenser; The depolymerization reactor is connected to the third condenser, which is connected to a receiving tank; the depolymerization reactor is also connected to a catalyst solution tank, an inhibitor solution tank, and a diluent solution tank, and the third condenser is also sequentially connected to a receiving tank, a second distillation tower, a fourth condenser, and a product tank; Its characteristics are: The depolymerization reactor is further connected to a pre-treatment device, which includes: a heavy component solution tank, a heater, a first distillation tower and a first condenser connected in sequence, and the first condenser is connected to the depolymerization reactor.

2. The acrylic acid recombination and decomposition system according to claim 1, characterized in that: The pretreatment device further comprises a fractional distillation tower and a second condenser connected in sequence, wherein the first condenser is connected to the fractional distillation tower, and the second condenser is connected to the depolymerization reactor.

3. The acrylic acid recombination and decomposition system according to claim 2, characterized in that: The depolymerization reaction kettle is also sequentially connected with: a residual liquid collection kettle, an incinerator, and an air discharge collector.

4. The acrylic acid recombination and decomposition system according to claim 3, characterized in that: At least one of the first distillation tower, the fractional distillation tower, and the second distillation tower is connected to the residual liquid collecting kettle.

5. The acrylic acid recombination and decomposition system according to claim 3, characterized in that: At least one of the first distillation tower, the fractional distillation tower, and the second distillation tower is connected to the vent trap.

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