Regeneration system of acetone waste liquid containing trace formaldehyde

Abstract

The utility model discloses a regeneration system for waste liquid containing trace formaldehyde and acetone. The regeneration system comprises a first filter, a reactor feeding pump, a fixed bed reactor, a second filter, a first rectification device and a second rectification device, the first filter is connected with an external acetone-containing waste liquid raw material through a pipeline, the first filter is connected with the fixed bed reactor through the reactor feeding pump, the fixed bed reactor is connected with the second filter, the second filter is connected with the first rectification device, and the second rectification device is connected with the second rectification device. The first rectification device is connected with the second rectification device; the acetone waste liquid purification device can effectively remove trace formaldehyde in the acetone waste liquid and purify and refine high-purity acetone, so that cyclic utilization of acetone is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of acetone waste liquid recovery, in particular to a regeneration system for acetone waste liquid containing trace formaldehyde. Background Art

[0002] Clopidogrel bisulfate can be used to prevent atherothrombotic events in patients with myocardial infarction, ischemic stroke, acute coronary syndrome, and other conditions. During the production of clopidogrel bisulfate by pharmaceutical companies, acetone, due to its strong solubility and volatility, is used as a solvent and detergent. This introduces impurities such as formaldehyde, dichloromethane, methanol, water, and toluene. The resulting acetone wastewater must undergo purification and refining before it can be recycled. However, recycled acetone has certain requirements for purity and impurities, particularly formaldehyde content at the ppm level, which is difficult to achieve using conventional distillation separation methods. Therefore, solving the problem of removing trace formaldehyde from acetone wastewater is key to achieving its recycling. Utility Model Content

[0003] The purpose of the utility model is to provide a regeneration system for acetone waste liquid containing trace formaldehyde, which can effectively remove the trace formaldehyde content in the acetone waste liquid.

[0004] To achieve the above object, a regeneration system for waste liquid containing trace formaldehyde and acetone is provided, comprising a first filter, a reactor feed pump, a fixed-bed reactor, a second filter, a first distillation device, and a second distillation device; the first filter is connected to an external acetone-containing waste liquid feedstock via a pipeline, the first filter is connected to the fixed-bed reactor via the reactor feed pump, the fixed-bed reactor is connected to the second filter, the second filter is connected to the first distillation device, and the first distillation device is connected to the second distillation device.

[0005] Furthermore, the first distillation device includes a first distillation tower, a first reboiler, a first condenser, a first reflux tank, a first reflux pump, a first top discharge pump and a first bottom discharge pump; the second filter is connected to the first distillation tower through a pipeline, the upper end of the first distillation tower is connected to the first condenser, the first condenser is connected to the upper end of the first reflux tank, the lower end of the first reflux tank is connected to the first reflux pump and the first top discharge pump, the first reflux pump is connected to the upper part of the first distillation tower, one end of the first reboiler is connected to the lower part of the first distillation tower, and the other end is respectively connected to the bottom pipeline of the first distillation tower and the first bottom discharge pump, and the first bottom discharge pump is connected to the second distillation device.

[0006] Furthermore, the second distillation device includes a second distillation tower, a second reboiler, a second condenser, a second reflux tank, a second reflux pump, a second top discharge pump and a second bottom discharge pump; the lower end of the first distillation tower is connected to the second distillation tower through the first bottom discharge pump, the upper end of the second distillation tower is connected to the second condenser, the second condenser is connected to the upper end of the second reflux tank, the lower end of the second reflux tank is connected to the second reflux pump and the top discharge pump, the second reflux pump is connected to the upper part of the second distillation tower, one end of the second reboiler is connected to the lower part of the second distillation tower, and the other end is respectively connected to the bottom pipeline of the second distillation tower and the second bottom discharge pump.

[0007] Furthermore, the fixed bed reactor is filled with a solid inorganic strong base.

[0008] Beneficial effects:

[0009] 1. The utility model provides a regeneration system for acetone waste liquid containing trace formaldehyde. Through a fixed bed reactor, the principle of the reaction between formaldehyde and strong alkali is utilized to convert the trace formaldehyde that is difficult to remove into other impurities that are easy to separate under normal temperature and pressure conditions, thereby achieving the removal of trace formaldehyde in acetone.

[0010] 2. The utility model provides a regeneration system for acetone waste liquid containing trace formaldehyde. It couples the reaction with the distillation process. The reaction is first used to remove trace formaldehyde, and then the difference in volatility between acetone and new and old impurities is used to finally separate high-purity acetone. The system operates continuously under normal pressure, with a simple process and a high recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a regeneration system for waste liquid containing trace amounts of formaldehyde and acetone according to the present invention;

[0012] Legend:

[0013] 1. First filter; 2. Reactor feed pump; 3. Fixed-bed reactor; 4. Second filter; 5. First distillation tower; 6. First condenser; 7. First reflux tank; 8. First reflux pump; 9. First top discharge pump; 10. First reboiler; 11. First bottom discharge pump; 12. Second distillation tower; 13. Second condenser; 14. Second reflux tank; 15. Second reflux pump; 16. Second top discharge pump; 17. Second reboiler; 18. Second bottom discharge pump. DETAILED DESCRIPTION

[0014] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0015] Reference Figure 1 The utility model embodiment provides a regeneration system for waste liquid containing trace formaldehyde and acetone, comprising a first filter 1, a reactor feed pump 2, a fixed bed reactor 3, a second filter 4, a first distillation device and a second distillation device.

[0016] The first distillation device includes a first distillation tower 5, a first condenser 6, a first reflux tank 7, a first reflux pump 8, a first top discharge pump 9, a first reboiler 10 and a first bottom discharge pump 11.

[0017] The second distillation device includes a second distillation tower 12 , a second condenser 13 , a second reflux tank 14 , a second reflux pump 15 , a second top discharge pump 16 , a second reboiler 17 and a second bottom discharge pump 18 .

[0018] The first filter 1 is connected to the external acetone-containing waste liquid raw material through a pipeline. The first filter 1 is connected to the fixed bed reactor 3 through the reactor feed pump 2. The fixed bed reactor 3 is connected to the second filter 4. The second filter 4 is connected to the first distillation tower 5 through a pipeline.

[0019] The upper end of the first distillation tower 5 is connected to the first condenser 6, the first condenser 6 is connected to the upper end of the first reflux tank 7, the lower end of the first reflux tank 7 is connected to the first reflux pump 8 and the first top discharge pump 9, the first reflux pump 8 is connected to the upper part of the first distillation tower 5, one end of the first reboiler 10 is connected to the lower part of the first distillation tower 5, and the other end is respectively connected to the bottom pipeline of the first distillation tower 5 and the first bottom discharge pump 11, and the first bottom discharge pump 11 is connected to the second distillation device.

[0020] The lower end of the first distillation tower 5 is connected to the second distillation tower 12 through the first bottom discharge pump 11, the upper end of the second distillation tower 12 is connected to the second condenser 13, the second condenser 13 is connected to the upper end of the second reflux tank 14, the lower end of the second reflux tank 14 is connected to the second reflux pump 15 and the top discharge pump 16, the second reflux pump 15 is connected to the upper part of the second distillation tower 12, one end of the second reboiler 17 is connected to the lower part of the second distillation tower 12, and the other end is respectively connected to the bottom pipeline of the second distillation tower 12 and the second bottom discharge pump 18.

[0021] The fixed bed reactor 3 is filled with a solid inorganic strong base.

[0022] Working principle:

[0023] The acetone-containing waste liquid feedstock enters a first filter 1. After solid impurities are filtered out by the first filter 1, it is then fed by a reactor feed pump 2 into a fixed-bed reactor 3. The fixed-bed reactor 3 is filled with a solid inorganic strong base. The trace formaldehyde in the acetone waste liquid reacts with the strong base to produce methanol and formate, removing the trace formaldehyde in the acetone waste liquid. The formaldehyde-free acetone waste liquid is filtered by a second filter 4 and then enters a first distillation tower 5. Within this tower 5, gas-liquid exchange occurs. The gaseous light components are condensed by a first condenser 6 and enter a first reflux tank 7. A portion of the gaseous light components is then returned to the top of the first distillation tower 5 as reflux via the first reflux pump 7. The remainder is discharged from the system via a first overhead discharge pump 9. The liquid heavy components and acetone are heated and vaporized in a first reboiler 10 and then returned to the first distillation tower 5. The remainder is fed to a second distillation tower 12 via a first bottom discharge pump 11. The liquid phase heavy components and acetone undergo gas-liquid exchange in the second distillation tower 12. The gaseous acetone is condensed by the second condenser 13 and enters the second reflux tank 14. Then, part of it is returned to the second distillation tower 12 from the top of the second distillation tower 12 as reflux liquid through the second reflux pump 15, and the remaining part is output from the system as acetone product through the second tower top discharge pump 16; the liquid phase heavy components are partially heated and vaporized by the second reboiler 17 and returned to the second distillation tower 12, and the remaining part is discharged from the system through the second tower bottom discharge pump 18.

[0024] The utility model provides a regeneration system for acetone waste liquid containing trace formaldehyde. The utility model uses a fixed bed reactor 3 and utilizes the principle of the reaction between formaldehyde and a strong base to convert trace formaldehyde that is difficult to remove into other impurities that are easy to separate under normal temperature and pressure conditions, thereby achieving the removal of trace formaldehyde in acetone. The reaction is coupled with a distillation process, first utilizing the reaction to remove trace formaldehyde, and then utilizing the difference in volatility between acetone and new and old impurities to finally separate high-purity acetone. The system operates continuously under normal pressure, has a simple process, and a high recovery rate.

[0025] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A regeneration system for waste liquid containing trace formaldehyde and acetone, characterized in that: The invention comprises a first filter, a reactor feed pump, a fixed-bed reactor, a second filter, a first distillation device and a second distillation device; the first filter is connected to an external acetone-containing waste liquid raw material through a pipeline, the first filter is connected to the fixed-bed reactor through the reactor feed pump, the fixed-bed reactor is connected to the second filter, the second filter is connected to the first distillation device, and the first distillation device is connected to the second distillation device.

2. A regeneration system for waste liquid containing trace formaldehyde and acetone according to claim 1, characterized in that: The first distillation device includes a first distillation tower, a first reboiler, a first condenser, a first reflux tank, a first reflux pump, a first top discharge pump and a first bottom discharge pump; the second filter is connected to the first distillation tower through a pipeline, the upper end of the first distillation tower is connected to the first condenser, the first condenser is connected to the upper end of the first reflux tank, the lower end of the first reflux tank is connected to the first reflux pump and the first top discharge pump, the first reflux pump is connected to the upper part of the first distillation tower, one end of the first reboiler is connected to the lower part of the first distillation tower, and the other end is respectively connected to the bottom pipeline of the first distillation tower and the first bottom discharge pump, and the first bottom discharge pump is connected to the second distillation device.

3. A regeneration system for waste liquid containing trace formaldehyde and acetone according to claim 2, characterized in that: The second distillation device includes a second distillation tower, a second reboiler, a second condenser, a second reflux tank, a second reflux pump, a second top discharge pump and a second bottom discharge pump; the lower end of the first distillation tower is connected to the second distillation tower through the first bottom discharge pump, the upper end of the second distillation tower is connected to the second condenser, the second condenser is connected to the upper end of the second reflux tank, the lower end of the second reflux tank is connected to the second reflux pump and the top discharge pump, the second reflux pump is connected to the upper part of the second distillation tower, one end of the second reboiler is connected to the lower part of the second distillation tower, and the other end is respectively connected to the bottom pipeline of the second distillation tower and the second bottom discharge pump.

4. A regeneration system for waste liquid containing trace formaldehyde and acetone according to claim 3, characterized in that: The fixed bed reactor is filled with a solid inorganic strong base.

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