CN100564367C - Triethylamine recovery processing method during acesulfame potassium is produced - Google Patents
Triethylamine recovery processing method during acesulfame potassium is produced Download PDFInfo
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- CN100564367C CN100564367C CNB2007101128820A CN200710112882A CN100564367C CN 100564367 C CN100564367 C CN 100564367C CN B2007101128820 A CNB2007101128820 A CN B2007101128820A CN 200710112882 A CN200710112882 A CN 200710112882A CN 100564367 C CN100564367 C CN 100564367C
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Abstract
The present invention relates to triethylamine recovery processing method and device in a kind of acesulfame potassium production, it is characterized in that may further comprise the steps: a. is placed on aqueous crude product triethylamine in the still kettle (1), be heated in 38 ℃ of-42 ℃ of scopes, time was about 20-40 minute, steam and collect the methylene dichloride and other lower-boiling impurity that contain in the crude product triethylamine earlier, collect by condenser (3) condensation; B. continue to be heated to about 83 ℃, insulation made water and triethylamine standing demix more than 30 minutes, and lower floor is a water, and the upper strata is a triethylamine, drain water at the bottom of the still after, collect the triethylamine on upper strata.At last with in the triethylamine of collecting with solid potassium hydroxide or molecular sieve drying, triethylamine moisture content is reached below 0.1%.The invention has the advantages that: the equipment of use is simple, and is easy to operate, safe and reliable, and cost is low, and product recovery rate improves, and running cost reduces significantly.
Description
Technical field:
The present invention relates to triethylamine recovery processing method and device in a kind of acesulfame potassium production.
Background technology:
Acesulfame potassium, chemical name acesulfame potassium are commonly called as AK sugar, are synthetic the 4th generation sweeting agents, and sugariness is 200 times of sucrose.Be ideal safety, heat-resisting, mouthfeel well in vivo not metabolism do not put aside the sweeting agent that physico-chemical property is stable.Be widely used in food, beverage, medicine, makeup, daily necessities.
The synthetic method of acesulfame potassium is more, select for use both at home and abroad at present be more advanced, raw material is easy to get, nontoxic, synthetic route that step is short; At first do catalyzer and ketene dimer condensation reaction at triethylamine and produce acetyl, acetamide sulfonic, use the sulphur trioxide dehydration condensation, make acesulfame potassium with the potassium hydroxide neutralization again with thionamic acid, through concentrated, decolouring, crystallization, dry finished product packing.
The main chemical reactions process
Condensation:
Cyclization:
Neutralization:
Reclaim the crude product triethylamine in the original production process spent acid, moisture approximately at normal temperatures about 25%, general by repeatedly distillation or compression rectification (0.5Mpa) are removed large quantity of moisture, further dry again use.Repeatedly distillation technique falls behind, and loss of material is big, and inferior separating effect is superseded.The complicated operation though compression rectification is feasible, facility investment is big, working cost, energy consumption height (a large amount of evaporations, condenser heat).Extensively retrieve at the problems referred to above, do not find relevant solution as yet.
Summary of the invention:
Purpose of the present invention be exactly to overcome that the loss of material that exists in the prior art is big, inferior separating effect, energy consumption height, complicated operation and the high shortcoming of cost and a kind of triethylamine recovery processing method and the device that propose.
To achieve these goals, the present invention has adopted following technical scheme:
Triethylamine recovery processing method during a kind of acesulfame potassium is produced is characterized in that may further comprise the steps:
A, aqueous crude product triethylamine is placed in the still kettle, aqueous crude product triethylamine is heated in 38 ℃ of-42 ℃ of scopes, the time steamed and collected the methylene dichloride and other lower-boiling impurity that contain in the crude product triethylamine earlier at 20-40 minute;
B, continue heating then aqueous crude product triethylamine temperature is risen in 80 ℃ of-85 ℃ of scopes, keep this temperature more than 25 minutes, make water and triethylamine standing demix, lower floor is a water, and the upper strata is a triethylamine, drain water at the bottom of the still after, collect the triethylamine on upper strata.
Making the optimum temps of aqueous crude product triethylamine heating among the step b is 83 ℃, keeps this temperature 25-35 minute.At last with in the triethylamine of collecting with solid potassium hydroxide or molecular sieve drying, triethylamine moisture content is reached below 0.1%.
The present invention also comprises a kind of used device of realizing in the described acesulfame potassium production of triethylamine recovery processing method, it is characterized in that this device adopts a kind of still kettle, the still kettle top is carried out the refrigerative brine condenser by one of pipe connection to methylene dichloride and other lower-boiling impurity, and the brine condenser bottom is by the collector of pipe connection methylene dichloride and other lower-boiling impurity.
On the basis of said apparatus, can arrive the still kettle top by pipe connection in the brine condenser bottom, so that make the refrigerative triethylamine be back to still kettle; Perhaps be provided with the water cooling plant that makes the triethylamine cooling for reflux at the still kettle top.
The invention has the advantages that: the equipment of use is simple, and is easy to operate, safe and reliable, and cost is low, and product recovery rate improves, and running cost reduces significantly.
Description of drawings:
Fig. 1 is the system diagram that the still kettle top is provided with the recycling and processing device of water cooling plant;
Fig. 2 is the system diagram that the still kettle top does not have the recycling and processing device of water cooling plant;
Embodiment
Embodiment one: as shown in Figure 1, still kettle adopts 5000 liters of separation column stills (1), and its top is provided with slender neck (2), establishes a water condenser (2a) at the top of neck (2), is cooled with circulating water, and it only just opens the condensation triethylamine in the time of 80 ℃-85 ℃.Lower-boiling impurities such as methylene dichloride are earlier with brine condenser (3) condensation, and brine condenser (3) is following with a collector of pipe connection (4).
Before the crude product triethylamine of operation at 30 ℃, it is about about 25% to be dissolved with moisture, in the suction separation column still (1), crude product triethylamine liquid heat is heated up about 40 ℃, about 30 minutes, steam lower-boiling impurities such as methylene dichloride earlier, with salt water condensation (3) condensation, then collect by collector (4).Then be warming up to 83 ℃ again, open the water condenser at the top of neck (2) simultaneously, the triethylamine of part vaporization refluxes 40 minutes said process times spent through the top of tower condenser condenses., leave standstill be incubated 83 ℃ half an hour more than thereafter, water and the obvious layering of triethylamine in the separation column still (1), lower floor is a water, the upper strata is a triethylamine.Observe from the bottom visor, divide water-yielding stratum earlier, regather the organic phase triethylamine, water content reaches below 1.5%, with triethylamine send into drying installation with solid potassium hydroxide or molecular sieve drying suction after, moisture content drops to below 0.1%, the charging feed groove is standby.
Example example two: as shown in Figure 2, the recirculated water cooling condenser is not established at the top of the slender neck (2) of separation column (1), and the vaporization material is all used brine condenser (3) condensation, and brine condenser (3) is following with a collector of pipe connection (4).Outlet at condenser (3) connects return line to slender neck (2) in addition.
Before about 30 ℃ of the crude product triethylamine of operation, it is about about 20% to be dissolved with water, in the suction heating kettle, heat temperature raising about 40 ℃, about 30 minutes of time spent, during steam lower-boiling impurity such as methylene dichloride earlier, with brine condenser (3) condensation, and collect with collector (4).Close then and collect valve F, open reverse flow valve H, continue to be warming up to 83 ℃ again, 28 minutes times spent, the triethylamine of part vaporization therebetween is back to the slender neck (2) of separation column (1) after with salt water condensation (3) condensation.When 83 ℃ of temperature, insulation was left standstill more than half an hour, the obvious layering of water and triethylamine, and lower floor is a water, the upper strata is a triethylamine.Observe from the bottom visor and to divide water-yielding stratum earlier, regather the organic phase triethylamine, its water content reaches below 1.5%, enter drying installation with solid potassium hydroxide or molecular sieve drying suction after, moisture content drops to below 0.1%, the charging feed groove is standby.
Claims (4)
1, the triethylamine recovery processing method during a kind of acesulfame potassium is produced is characterized in that may further comprise the steps:
A, aqueous crude product triethylamine is placed in the still kettle, is heated in 38 ℃ of-42 ℃ of scopes, the time steamed and collected the methylene dichloride and other lower-boiling impurity that contain in the crude product triethylamine earlier at 20-40 minute;
B, continue heating then aqueous crude product triethylamine temperature is risen in 80 ℃ of-85 ℃ of scopes, keep this temperature more than 25 minutes, make water and triethylamine standing demix, lower floor is a water, and the upper strata is a triethylamine, drain water at the bottom of the still after, collect the triethylamine on upper strata.
2, the triethylamine recovery processing method during acesulfame potassium according to claim 1 is produced is characterized in that making in claim 1 step b aqueous crude product triethylamine temperature to rise to 83 ℃, keeps this temperature more than 25 minutes.
3, the triethylamine recovery processing method during acesulfame potassium according to claim 1 and 2 is produced, it is characterized in that may further comprise the steps: the triethylamine of collection solid potassium hydroxide drying reaches below 0.1% triethylamine moisture content.
4, the triethylamine recovery processing method during acesulfame potassium according to claim 1 and 2 is produced, it is characterized in that may further comprise the steps: the triethylamine molecular sieve drying of collection reaches below 0.1% triethylamine moisture content.
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| CNB2007101128820A CN100564367C (en) | 2007-09-12 | 2007-09-12 | Triethylamine recovery processing method during acesulfame potassium is produced |
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| CNB2007101128820A CN100564367C (en) | 2007-09-12 | 2007-09-12 | Triethylamine recovery processing method during acesulfame potassium is produced |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11718594B2 (en) | 2016-09-21 | 2023-08-08 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11724994B2 (en) | 2016-09-21 | 2023-08-15 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11724993B2 (en) | 2016-09-21 | 2023-08-15 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11731948B2 (en) | 2016-09-21 | 2023-08-22 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
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| CN101643420B (en) * | 2008-08-07 | 2013-01-30 | 比亚迪股份有限公司 | Method for reclaiming halogen acid salt of triethylamine in residue of synthesized vinylene carbonate |
| CN102079712A (en) * | 2010-12-31 | 2011-06-01 | 大连联化化学有限公司 | Method for recycling anhydrous organic amine from organic amine salt |
| US9024016B2 (en) | 2012-06-08 | 2015-05-05 | Nutrinova Nutrition Specialists & Food Ingredients GmbH | Process for producing acesulfame potassium |
| CN104193625B (en) * | 2014-09-27 | 2015-12-09 | 安徽金禾实业股份有限公司 | The recovery method of catalyst of triethylamine in acesulfame potassium production |
| CN106349009B (en) * | 2016-08-30 | 2018-11-06 | 安徽金禾实业股份有限公司 | Dichloromethane rectifying condensation method in a kind of synthesis of acesulfame potassium |
| CN107417545B (en) * | 2017-04-20 | 2019-08-16 | 浙江中山化工集团股份有限公司 | The aftertreatment technology of condensation liquid in a kind of Bentazon preparation process |
| CN112142602B (en) * | 2019-06-27 | 2023-02-03 | 南通醋酸化工股份有限公司 | Continuous treatment method for acesulfame potassium waste acid |
| CN111624195A (en) * | 2020-05-26 | 2020-09-04 | 杉杉新材料（衢州）有限公司 | Method for analyzing acidity of electrolyte of lithium ion battery |
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2007
- 2007-09-12 CN CNB2007101128820A patent/CN100564367C/en active Active
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11718594B2 (en) | 2016-09-21 | 2023-08-08 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11724994B2 (en) | 2016-09-21 | 2023-08-15 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11724993B2 (en) | 2016-09-21 | 2023-08-15 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
| US11731948B2 (en) | 2016-09-21 | 2023-08-22 | Celanese International Corporation | Acesulfame potassium compositions and processes for producing same |
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| CN101157666A (en) | 2008-04-09 |
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