CN218451886U - Mercaptopropionic acid mother liquor treatment system - Google Patents

Abstract

Mercaptopropionic acid mother liquor processing system includes that the mother liquor receives jar, tubular static mixer, acidizing buffer tank, centrifugal extraction device, neutralization tank, waste water rectifying column, evaporimeter, condenser, the export that the jar was received to the mother liquor is linked together through the pipeline with tubular static mixer's import, tubular static mixer is equipped with the hydrochloric acid feed inlet, and hydrochloric acid gets into tubular static mixer from the hydrochloric acid feed inlet, tubular static mixer's export and acidizing buffer tank feed inlet are linked together through the pipeline, the discharge gate of acidizing buffer tank is linked together through the pipeline with centrifugal extraction device's import, centrifugal extraction device is equipped with the extractant feed inlet, and the extractant gets into centrifugal extraction device from the extractant feed inlet, centrifugal extraction device is equipped with the aqueous phase export, and centrifugal extraction device's aqueous phase export passes through the pipeline with the import of neutralization tank and communicates.

Description

Mercaptopropionic acid mother liquor treatment system

Technical Field

The utility model relates to a chemical industry technical field especially relates to mercaptopropionic acid mother liquor processing system.

Background

Mercaptopropionic acid is an intermediate of the pharmaceutical fenamic acid, and is also used as a stabilizer for polyvinyl chloride. It can be used in transparent products like thioglycolic acid, and has good thermal stability, superior to other stabilizers. Also useful as antioxidants, catalysts and biochemicals. One method for preparing mercaptopropionic acid is to obtain mercaptopropionic acid through acidification reaction of beta-sodium mercaptopropionate and hydrochloric acid. The preparation method comprises the steps of carrying out addition reaction on acrylic acid, hydrochloric acid and water to generate thioureidopropionic acid, crystallizing and hydrolyzing the thioureidopropionic acid to obtain sodium mercaptopropionate, adding hydrochloric acid to acidify the thioureidopropionic acid, obtaining a sodium mercaptopropionate solution, carrying out centrifugal extraction to purify the thioureidopropionic acid, wherein in the centrifugal extraction process, high-speed friction and impact of fluid can generate static electricity, and potential safety hazards such as fire hazard, explosion and the like can be generated under the condition of high oxygen concentration.

Disclosure of Invention

In view of the above, there is a need to provide a mercaptopropionic acid mother liquor treatment system for safe separation and extraction.

Mercaptopropionic acid mother liquor processing system includes that the mother liquor receives jar, tubular static mixer, acidizing buffer tank, centrifugal extraction device, neutralization tank, waste water rectifying column, evaporimeter, condenser, the export of mother liquor receipt jar is linked together through the pipeline with the import of tubular static mixer, tubular static mixer is equipped with the hydrochloric acid feed inlet, and hydrochloric acid gets into tubular static mixer from the hydrochloric acid feed inlet, the export of tubular static mixer and acidizing buffer tank feed inlet are linked together through the pipeline, the discharge gate of acidizing buffer tank and the import of centrifugal extraction device are linked together through the pipeline, centrifugal extraction device is equipped with the extractant feed inlet, and the extractant gets into centrifugal extraction device from the extractant feed inlet, centrifugal extraction device is equipped with the aqueous phase export, and the aqueous phase export of centrifugal extraction device and the import of neutralization tank pass through the pipeline intercommunication, and the export of waste water rectifying column and the evaporimeter pass through the pipeline intercommunication, the centrifugal extraction device still is equipped with nitrogen gas import and export, and during operation, and the export of centrifugal extraction device and the condenser are filled into through the nitrogen gas intercommunication.

Preferably, the centrifugal extraction device is a first-stage centrifugal extractor, a second-stage centrifugal extractor or a third-stage centrifugal extractor, the discharge port of the acidification buffer tank is connected with the light phase feed port of the first-stage centrifugal extractor through a pipeline, the light phase discharge port of the first-stage centrifugal extractor is connected with the light phase feed port of the second-stage centrifugal extractor through a pipeline, the light phase discharge port of the second-stage centrifugal extractor is connected with the light phase feed port of the third-stage centrifugal extractor through a pipeline, the light phase discharge port of the third-stage centrifugal extractor is connected with the feed port of the neutralization tank through a pipeline, the heavy phase discharge port of the third-stage centrifugal extractor is connected with the heavy phase feed port of the second-stage centrifugal extractor through a pipeline, and the heavy phase discharge port of the second-stage centrifugal extractor is connected with the heavy phase feed port of the first-stage centrifugal extractor through a pipeline.

Preferably, the condenser is a graphite condenser and comprises a first-stage graphite condenser, a second-stage graphite condenser and a third-stage graphite condenser, wherein an outlet of the first-stage graphite condenser is communicated with an inlet of the second-stage graphite condenser through a pipeline, an outlet of the second-stage graphite condenser is connected with an inlet of the third-stage graphite condenser through a pipeline, and an outlet of the third-stage graphite condenser is communicated with an inlet of the heat accumulating type thermal combustion device through a pipeline.

Preferably, the evaporator is a triple-effect evaporator, the triple-effect evaporator is also provided with a steam heating interlayer, and steam is introduced into the steam interlayer.

Has the advantages that: the utility model discloses mercaptopropionic acid mother liquor processing system is through treating mercaptopropionic acid separator through centrifugal extraction device separation, organic phase and water phase mixture in the result, need extract out with the extractant, need separate organic phase and water phase among the extraction process, be equipped with nitrogen gas import and export on the centrifugal extraction device, the acidizing reaction material that produces after the separation, mercaptopropionic acid, water, sodium chloride, a small amount of hydrochloric acid gets into neutralization tank, liquid caustic soda gets into in the neutralization tank and goes into three effect evaporator after the neutralization, through the decontamination water treatment after the evaporation condensation of the salt-containing waste water of light impurity in with reaction material through steam heating, centrifugal extraction device is at the during operation, fill nitrogen gas in to the inner chamber, the air of replacement the inside, thereby make oxygen concentration maintain within the safety range, eliminate the potential safety hazard.

Drawings

FIG. 1 is a schematic diagram of a mercaptopropionic acid mother liquor treatment system.

In the figure: the system comprises a mother liquor receiving tank 1, a tubular static mixer 2, a hydrochloric acid feed inlet 201, an acidification buffer tank 3, a centrifugal extraction device 4, an extracting agent feed inlet 401, a water phase outlet 402, a nitrogen inlet 403, a nitrogen outlet 404, a neutralization tank 5, a liquid caustic feed inlet 501, a wastewater rectification tower 6, a heat accumulating type combustion device 601, a salt-containing wastewater discharge outlet 602, an evaporator 7, a steam interlayer 701, a sewage treatment tank 702, an industrial waste salt discharge outlet 703, a condenser 8, a frozen brine interlayer 801 and a heat accumulating type combustion device discharge outlet 802.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Referring to fig. 1, the mercaptopropionic acid mother liquor treatment system comprises a mother liquor receiving tank 1, a tubular static mixer 2, an acidification buffer tank 3, a centrifugal extraction device 4, a neutralization tank 5, a wastewater rectification tower 6, an evaporator 7 and a condenser 8, wherein an outlet of the mother liquor receiving tank 1 is communicated with an inlet of the tubular static mixer 2 through a pipeline, the tubular static mixer 2 is provided with a hydrochloric acid feed port 201, hydrochloric acid enters the tubular static mixer 2 from the hydrochloric acid feed port 201, an outlet of the tubular static mixer 2 is communicated with a feed port of the acidification buffer tank 3 through a pipeline, a discharge port of the acidification buffer tank 3 is communicated with an inlet of the centrifugal extraction device 4 through a pipeline, the centrifugal extraction device 4 is provided with an extractant feed port 401, the extractant enters the centrifugal extraction device 4 from the extractant feed port 401, the centrifugal extraction device 4 is provided with a water phase outlet 402, the water phase outlet 402 of the centrifugal extraction device 4 is communicated with an inlet of the neutralization tank 5 through a pipeline, the neutralization tank 5 is further provided with a liquid alkali feed port 501, liquid alkali enters the neutralization tank 5 from the liquid alkali feed port 501, an outlet of the neutralization tank 5 is communicated with an inlet of the wastewater rectification tower 6, an outlet of the centrifugal rectification tower 6 is communicated with an inlet of the centrifugal extraction tower 6, and an outlet of the nitrogen gas inlet of the centrifugal extraction device 403 is communicated with the centrifugal extraction device 4, and a nitrogen gas inlet of the centrifugal extraction device 403 is communicated with the extraction device 403, and the nitrogen gas inlet of the extraction device 404.

The utility model discloses a mercaptopropionic acid mother liquor processing system is when the operation, mercaptopropionic acid sodium solution gets into mother liquor and receives jar 1, later get into and turn into mercaptopropionic acid through the acidizing reaction in tubular static mixer 2, the main reaction of acidizing reaction takes place acidizing reaction for beta-mercaptopropionic acid sodium and hydrochloric acid and generates mercaptopropionic acid, the composition of the mixed liquid that comes out from tubular static mixer 2 is mainly mercaptopropionic acid, water, sodium chloride, a small amount of hydrochloric acid, need to extract out the mercaptopropionic acid in the mixed liquid with the extractant, and through centrifugal extraction device 4 with organic phase and water phase separation, the water phase includes the water phase, sodium chloride, a small amount of extractant and hydrochloric acid enter into in with jar 5, get into waste water rectifying tower 6 after adding liquid alkali, the mixed liquid that gets into waste water rectifying tower 6 is through the separation, the extractant is recycled, noncondensable gas goes heat accumulation formula combustion apparatus 601, remaining salt-containing waste water enters into evaporimeter 7, heat through steam 701 heating, the sewage treatment 702 device is removed to the comdensation that forms after the salt-containing evaporation condensation.

In a preferred embodiment, the extractant is 1,2-dichloroethane.

Preferably, the centrifugal extraction device 4 is a first-stage centrifugal extractor, a second-stage centrifugal extractor or a third-stage centrifugal extractor, the discharge port of the acidification buffer tank 3 is connected with the light phase feed port of the first-stage centrifugal extractor through a pipeline, the light phase discharge port of the first-stage centrifugal extractor is connected with the light phase feed port of the second-stage centrifugal extractor through a pipeline, the light phase discharge port of the second-stage centrifugal extractor is connected with the light phase feed port of the third-stage centrifugal extractor through a pipeline, the light phase discharge port of the third-stage centrifugal extractor is connected with the feed port of the neutralization tank through a pipeline, the heavy phase discharge port of the third-stage centrifugal extractor is connected with the heavy phase feed port of the second-stage centrifugal extractor through a pipeline, and the heavy phase discharge port of the second-stage centrifugal extractor is connected with the heavy phase feed port of the first-stage centrifugal extractor through a pipeline.

The centrifugal extraction device 4 is also provided with a nitrogen inlet 403 and a nitrogen outlet 404, when the centrifugal extraction device 4 works, nitrogen is filled into the inner cavity to replace the air inside, so that the oxygen concentration is maintained within a safe range, after the nitrogen is discharged from the centrifugal extraction device 4, part of the extractant is taken out, the nitrogen carrying the extractant enters the condenser 8, the frozen brine 801 is used as a cooling medium to condense most of the extractant in the nitrogen, and the residual gas is used as process waste gas and sent to the heat accumulating type thermal combustion device 802 for processing.

The working principle of the centrifugal extractor is as follows: the mixed liquid is fully mixed in a centrifugal force field to promote solute transfer, then two-phase liquid is separated and discharged, the centrifugal extraction device 4 mainly comprises two working processes, namely mixing mass transfer and centrifugal separation, the centrifugal extraction device 4 can automatically and continuously complete the mixing and separating processes, the mixed liquid formed by mixing the water phase and the organic phase enters the rotary drum, the mixed liquid and the rotary drum synchronously rotate at high speed to generate centrifugal force under the drive of the rotary drum and a radial plate thereof, the light-phase liquid is fed from the vicinity of the wall of the drum, the heavy-phase liquid is fed from the center of the drum to form two-phase dispersed countercurrent contact in the drum, and finally, when the two phases reach the other end of the drum, the heavy-phase liquid is respectively concentrated on the center and the inner wall of the drum.

Further, the condenser 8 is a graphite condenser and comprises a first-level graphite condenser, a second-level graphite condenser and a third-level graphite condenser, wherein an outlet of the first-level graphite condenser is communicated with an inlet of the second-level graphite condenser through a pipeline, an outlet of the second-level graphite condenser is connected with an inlet of the third-level graphite condenser through a pipeline, and an outlet of the third-level graphite condenser is communicated with an inlet of the heat accumulating type thermal combustion device 802 through a pipeline.

Through the gradual cooling of condenser 8 for the extractant that contains in the nitrogen gas is by the abundant cooling liquefaction, thereby can effectively retrieve the extractant.

Further, the evaporator 7 is a triple-effect evaporator, the triple-effect evaporator is further provided with a steam heating interlayer 701, and steam is introduced into the steam interlayer 701.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (4)

1. A mercaptopropionic acid mother liquor processing system which characterized in that: including mother liquor receiving tank, tubular static mixer, acidizing buffer tank, centrifugal extraction device, neutralization tank, waste water rectifying column, evaporimeter, condenser, the export of mother liquor receiving tank is linked together through the pipeline with tubular static mixer's import, tubular static mixer is equipped with the hydrochloric acid feed inlet, and hydrochloric acid gets into tubular static mixer from the hydrochloric acid feed inlet, tubular static mixer's export and acidizing buffer tank feed inlet are linked together through the pipeline, the discharge gate of acidizing buffer tank and centrifugal extraction device's import are linked together through the pipeline, centrifugal extraction device is equipped with the extractant feed inlet, and the extractant gets into centrifugal extraction device from the extractant feed inlet, centrifugal extraction device is equipped with the aqueous phase export, and the aqueous phase export of centrifugal extraction device passes through the pipeline with the import of neutralization tank and communicates, and the neutralization tank still is equipped with the liquid caustic soda feed inlet, and the liquid caustic soda feed inlet entering neutralization tank from the liquid caustic soda feed inlet, and the import of waste water rectifying column pass through the pipeline intercommunication, and the export and the evaporimeter of waste water rectifying column pass through the pipeline intercommunication, centrifugal extraction device still is equipped with nitrogen gas import and nitrogen gas outlet, and the centrifugal extraction device fills in the operation, and passes through the gas inlet of condenser and communicates.

2. The mercaptopropionic acid mother liquor treatment system according to claim 1, wherein: the centrifugal extraction device comprises a first-stage centrifugal extractor, a second-stage centrifugal extractor and a third-stage centrifugal extractor, wherein a discharge port of an acidification buffer tank is connected with a light phase feed port of the first-stage centrifugal extractor through a pipeline, a light phase discharge port of the first-stage centrifugal extractor is connected with a light phase feed port of the second-stage centrifugal extractor through a pipeline, a light phase discharge port of the second-stage centrifugal extractor is connected with a light phase feed port of the third-stage centrifugal extractor through a pipeline, a light phase discharge port of the third-stage centrifugal extractor is connected with a feed port of a neutralization tank through a pipeline, a heavy phase discharge port of the third-stage centrifugal extractor is connected with a heavy phase feed port of the second-stage centrifugal extractor through a pipeline, and a heavy phase discharge port of the second-stage centrifugal extractor is connected with a heavy phase feed port of the first-stage centrifugal extractor through a pipeline.

3. The mercaptopropionic acid mother liquor treatment system according to claim 1, wherein: the condenser is a graphite condenser and comprises a first-stage graphite condenser, a second-stage graphite condenser and a third-stage graphite condenser, wherein an outlet of the first-stage graphite condenser is communicated with an inlet of the second-stage graphite condenser through a pipeline, an outlet of the second-stage graphite condenser is connected with an inlet of the third-stage graphite condenser through a pipeline, and an outlet of the third-stage graphite condenser is communicated with an inlet of the heat accumulating type thermal combustion device through a pipeline.

4. The mercaptopropionic acid mother liquor treatment system according to claim 1, wherein: the evaporator is a triple-effect evaporator, the triple-effect evaporator is also provided with a steam heating interlayer, and steam is introduced into the steam interlayer.

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