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Method for preparing sodium acetate from acetic acid waste gas through alkaline absorption
CN103664573A
China
Worldwide applications
2012
CN
Application CN201210355758.8A events
2012-09-24
2014-03-26
2016-06-01
Application granted
2016-06-01
Status
Active
2032-09-24
Anticipated expiration
Description
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Technical field
Field of waste treatment in the present invention relates to that medicine is synthetic and producing, is specifically related to the processing method that acetic acid waste gas recovery and treatment method and acetic acid waste gas in Glucuronic acid .gamma.-lactone production process are prepared sodium acetate.
Background technology
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In Glucuronic acid .gamma.-lactone production process, esterification is used acetic acid, when centrifugal drying material, produce a large amount of acetic acid gas, acetic acid gas has intense stimulus smell, affect production environment and atmospheric environment, take simple water spray-absorption in producing early stage, absorbs not exclusively, and part acetic acid gas still enters atmosphere, operating environment of pollution and atmospheric environment, must thoroughly administer.
Waste gas pollution control and treatment must have certain input, consumes new material, likely produces new pollution simultaneously.With acetic acid waste gas alkali absorption preparation sodium acetate trihydrate and anhydrous sodium acetate, be broad-spectrum product, it has good shock-absorbing capacity, applies to electroplate and dyeing; There is antiseptic property, as the sanitas of food and feed; As water purifying assistant and stopping agent; In chemosynthesis, use wider.It is a kind of fine chemical product being of wide application.
Summary of the invention
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The object of the invention is the defect of processing for acetic acid waste gas absorption in Glucuronic acid .gamma.-lactone production process, improve acetic acid waste gas absorption treatment process, utilize acetic acid waste gas to prepare sodium acetate for raw material production, solve acetic acid exhaust emission problem and provide a kind of acetic acid waste gas alkali that utilizes to absorb the method for preparing sodium acetate
The technical scheme that realizes the object of the invention is:
Provide a kind of acetic acid waste gas alkali to absorb the method for preparing sodium acetate, it is characterized in that: it consists of following steps:
1, the acetic acid waste gas that in chemical industry or pharmaceutical production, (as Glucuronic acid .gamma.-lactone is produced in centrifugal drying material process) produces is inputted to alkali absorption tower by producing induced draft fan, as the raw material of producing sodium acetate, carry out multistage alkali circulation and absorb, the gas after absorption is emptying;
2, control alkali absorption liquid temperature between 30 to 80 ℃, use at any time pH detection paper alkali absorption liquid pH value, when pH value≤10, add solid state hydrogen sodium oxide or sodium carbonate;
When 3, cumulative calculation adds the concentration of sodium hydroxide or sodium carbonate to reach 25% to 50%, stop adding alkali, in the time of between alkali absorption liquid pH value reaches 8 to 9, by alkali absorption liquid input crystallization kettle;
4, alkali absorption liquid is cooled to-10 to 30 ℃, centrifugal rejection filter, obtains sodium acetate trihydrate, and sodium acetate trihydrate can direct marketing, also can be through 120 to 150 ℃ of dry anhydrous sodium acetates of preparing;
5, centrifuge mother liquor adds recycle in alkali absorption tower, adds superoxol or potassium permanganate solution decolouring after mother liquor its colour changed into yellow, guarantees that applying mechanically mother liquor does not affect quality product.
Acetic acid waste gas described in step 1, comprises the acetic acid waste gas producing in Glucuronic acid .gamma.-lactone production process, but is not limited to the acetic acid waste gas that produces in Glucuronic acid .gamma.-lactone production process.
Described in step 1, carry out multistage alkali absorption, comprise 1-5 level alkali absorption process.
Acetic acid waste gas alkali as above absorbs the method for preparing sodium acetate, it is characterized in that absorbing the alkali that acetic acid waste gas uses and includes but not limited to sodium hydroxide or sodium carbonate.
Control alkali absorption liquid temperature described in step 2, between 30---80 ℃, be take and is controlled at 50-65 ℃ as optimum.
Obviously, those skilled in the art also can make absorption agent by potassium hydroxide, ammoniacal liquor etc. and prepare potassium acetate, ammonium acetate by absorbing acetic acid waste gas, and the displacement of suchlike absorption agent and the acetate moiety salt that obtains do not depart from the present invention's essence place.
In the present invention, acetic acid waste gas is taked the mode that the circulation of multi-stage column alkali absorbs, and acetic acid off gas treatment is thorough; With acetic acid waste gas, substitute the raw material production sodium acetate costs such as acetic acid low; Utilize the mode that relatively-high temperature circulation alkali absorbs, gradation plus-minus improves acetic acid sodium reaction generation concentration, removed the technological process of concentrated raising sodium acetate concentration from, direct crystallization obtains sodium acetate, simplified technological process, reduce acetic acid waste gas alkali and absorbed steam consumption and the power consumption of producing in sodium acetate process, further reduced production cost; Mother liquor recirculation is applied mechanically, and does not have new waste waste water,waste gas and industrial residue to produce, be clean, the method for environmental protection, energy-conservation, High-efficient Production sodium acetate.
Accompanying drawing explanation
Fig. 1 is that the present invention's acetic acid waste gas alkali in Glucuronic acid .gamma.-lactone is produced absorbs the process flow diagram that preparation sodium acetate trihydrate is used.
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Embodiment
Below in conjunction with accompanying drawing explanation embodiments of the invention, but be not limited to following examples:
Utilize acetic acid waste gas alkali to absorb preparation sodium acetate trihydrate and prepare example:
Technological process by Fig. 1 operates, in one-level alkali absorption tower He in secondary alkali absorption tower, add respectively 1000 liters, water, 96% 200 kilograms, sodium hydroxide, be heated to dissolve between 55-60 ℃, pump is beaten circulation absorption Glucuronic acid .gamma.-lactone workshop and is slightly got rid of the acetic acid waste gas that conveying is come, control alkali absorption temperature between 50-60 ℃, with pH test paper, measure pH in one-level alkali absorption tower at any time, when pH value approaches 10, add 96% sodium hydroxide, in one-level alkali absorption tower, add 96% sodium hydroxide total amount accumulative total and reach 400 kilograms, when liquid pH value to be absorbed reaches 8-9, absorption liquid is inputted to crystallization kettle, control-5 ℃ of crystallizations, rejection filter obtains sodium acetate trihydrate.Crystallization filtrate cover is for two-level absorption tower.
In one-level alkali absorption tower, after absorption liquid input crystallization kettle, absorption liquid in secondary alkali absorption tower is proceeded to one-level alkali absorption tower.Crystallization filtrate adds water and absorbs and join alkali solvent as secondary alkali, joins alkali at every turn and adds 200 kilograms, 96% sodium hydroxide and 15 liters of hydrogen peroxide.Carry out as stated above operate continuously successively, circulation absorbs continuous production sodium acetate trihydrate;
The technical data of continuous 5 batches of production sodium acetate trihydrate below:
| Experiment lot number | Sodium hydroxide concentration | Hydrogen peroxide consumption | Sodium acetate trihydrate output | Remarks |
| 01 | 400kg | 0 | 1170kg | Do not overlap mother liquor |
| 02 | 400kg | 0 | 1197 kg | Do not overlap mother liquor |
| 03 | 400kg | 15L | 1301 kg | Apply mechanically mother liquor |
| 04 | 400kg | 15L | 1295 kg | Apply mechanically mother liquor |
| 05 | 400kg | 15L | 1292 kg | Apply mechanically mother liquor |
Shown detailed embodiment of the present invention above, apparent, those skilled in the art, under prerequisite of the present invention, can carry out part modifications and changes; The content of mentioning in description above and accompanying drawing, only as illustrative case, is not limitation of the present invention; The acetic acid waste gas alkali with technical characterictic described herein absorbs the method for preparing sodium acetate, all falls into this patent protection domain.
Claims (5)
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Claims (5)
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1. acetic acid waste gas alkali absorbs a method of preparing sodium acetate, it is characterized in that: it consists of following steps:
1, the acetic acid waste gas producing in chemical industry or pharmaceutical production is inputted to alkali absorption tower by induced draft fan, as the raw material of producing sodium acetate, carry out multistage alkali circulation and absorb, the gas after absorption is emptying;
2, control alkali absorption liquid temperature between 30 to 80 ℃, when pH value≤10, add solid state hydrogen sodium oxide or sodium carbonate;
When 3, cumulative calculation adds the concentration of sodium hydroxide or sodium carbonate to reach 25% to 50%, stop adding alkali, when alkali absorption liquid pH value reaches between 8-to 9, by alkali absorption liquid input crystallization kettle;
4, alkali absorption liquid is cooled to-10 to 30 ℃, centrifugal rejection filter, obtains sodium acetate trihydrate, and sodium acetate trihydrate can direct marketing, also can be through 120 to 150 ℃ of dry anhydrous sodium acetates of preparing;
5, centrifuge mother liquor adds recycle in alkali absorption tower, adds superoxol or potassium permanganate solution decolouring after mother liquor its colour changed into yellow.
2. acetic acid waste gas alkali as claimed in claim 1 absorbs the method for preparing sodium acetate, it is characterized in that: the acetic acid waste gas described in step 1, comprise the acetic acid waste gas producing in Glucuronic acid .gamma.-lactone production process, but be not limited to the acetic acid waste gas that produces in Glucuronic acid .gamma.-lactone production process.
3. acetic acid waste gas alkali as claimed in claim 1 absorbs the method for preparing sodium acetate, it is characterized in that: described in step 1, carry out multistage alkali absorption, comprise 1-5 level alkali absorption process.
4. acetic acid waste gas alkali as claimed in claim 1 absorbs the method for preparing sodium acetate, it is characterized in that: the alkali that described absorption acetic acid waste gas is used includes but not limited to sodium hydroxide or sodium carbonate.
5. acetic acid waste gas alkali as claimed in claim 1 absorbs the method for preparing sodium acetate, it is characterized in that: the control alkali absorption liquid temperature described in step 2, between 30---80 ℃, be take and is controlled at 50-65 ℃ as optimum.