CN105293801B - A kind of method for removing acetaldehyde in starch sugar evaporation condensed water - Google Patents
A kind of method for removing acetaldehyde in starch sugar evaporation condensed water Download PDFInfo
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- CN105293801B CN105293801B CN201510709391.9A CN201510709391A CN105293801B CN 105293801 B CN105293801 B CN 105293801B CN 201510709391 A CN201510709391 A CN 201510709391A CN 105293801 B CN105293801 B CN 105293801B
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- condensed water
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- starch sugar
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- removing acetaldehyde
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Abstract
The present invention discloses a kind of method for removing acetaldehyde in starch sugar evaporation condensed water, and feature is to comprise the following steps that：（1）Condensed water pre-treatment, 70 90 DEG C are warming up to using heat exchanger by condensed water；（2）Water acetaldehyde after absorption, leaf-type filter filter activity charcoal is less than 10mg/kg；（3）Vacuum flashing, flash tank goes out water colorless, and tasteless, electrical conductivity is less than 10 μ s/cm, pH 6.0 8.0, and acetaldehyde is less than 5mg/kg.（4）Cooling, from heat exchanger leaving water temperature at 30 60 DEG C, advantage is that technological process is simple, production cost is low, the effect for removing acetaldehyde is obvious, and the condensed water after the processing of above process reaches drinking water standard GB5749 2006, and final acetaldehyde is less than 5mg/kg.
Description
Technical field
The invention belongs to food chemistry technical field, acetaldehyde in starch sugar evaporation condensed water is removed more particularly, to a kind of
Method.
Background technology
Acetaldehyde is a kind of carbonyl complex, the colourless liquid at normal temperatures and pressures with pungent fruity odours, density ratio
Water is small, can be mixed with water, ether etc. with arbitrary proportion, easily oxidation or reduces.The boiling point of acetaldehyde is 20.8 DEG C, can release stimulation
Property steam, highly volatile and burning, place voluntarily to aoxidize in atmosphere and generate unstable peroxide.Starch sugar was produced
The approach of acetaldehyde is produced in journey mainly 3：One is the stoke degraded of alanine, few 1 carbon atom of producing ratio alanine
Acetaldehyde；Two be without alcohol oxidation caused by maillard reaction product melanoid and polyphenol substance；Three be the biochemical reaction of microorganism.Its
Influence of the middle microbial metabolism approach to starch sugar quality is maximum.In the production of starch sugar, due to having microorganism and some
The presence of enzyme, glucose is broken down into ethanol, oxidation of ethanol production acetaldehyde.In the evaporation process of starch sugar, acetaldehyde is from starch
It is transferred in sugar in condensed water, causes acetaldehyde to be enriched with condensed water, concentration reaches as high as 1200mg/kg, is produced pungent
Smell, condensed water is not suitable for being back to again in production as industrial water, it is necessary to passes through proper treatment, removes in condensed water
Acetaldehyde and other peculiar smell, otherwise as directly recycling can influence the mouthfeel and related physical and chemical index of starch sugar final products.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method for removing acetaldehyde in starch sugar evaporation condensed water, should
Acetaldehyde in condensed water effectively can be down to 5mg/kg by method, so as to reach that recycling condensing water, in production, reaches water-saving consumption-reduction
Purpose.
The present invention solve the technical scheme that is used of above-mentioned technical problem for：One kind removes second in starch sugar evaporation condensed water
The method of aldehyde, is comprised the following steps that：
(1) condensed water pre-treatment：By the condensation water collection after evaporator evaporation in starch sugar preparation process in a condensation
In water pot, heated using plate type heat exchanger and steam, condensate temperature is risen to 70-90 DEG C；
(2) adsorb：The condensed water that step (1) is obtained is with activated carbon by weight 1000：0.5-1.5 ratio mixing
Afterwards, it is 1h-4h to control adsorption time, is then filtered to remove activated carbon by scribbling diatomaceous leaf-type filter, during filtering,
Input and output material pressure difference≤4bar of leaf-type filter；
(3) vacuum flashing：In condensed water feeding flash tank after the adsorption treatment that step (2) is obtained, control flash distillation is true
Reciprocal of duty cycle carries out vapor-liquid separation, fixed gas is discharged by vavuum pump in -70kPa to -31.2kPa after flash-off steam is condensed, and condenses
Liquid is flowed into bottom water sealed tank by pipeline；
(4) cool：Condensed water in water sealed tank is cooled to 30-50 DEG C and stored.
Starch sugar described in step (1) is fructose syrup, glucose syrup or malt syrup.
Condensed water pre-treatment described in step (1) is warming up to 80 DEG C.Raise after temperature, reach 70-90 DEG C of activated carbon
Optimal adsorption temperature, is that the adsorption effect of activated carbon creates conditions.
Activated carbon used is craboraffin, humidity≤10% in step (2).The weight of condensed water and activated carbon when using
Amount is than being 1000:Adsorption time is 1-4h after 0.5-1.5, mixing, and the acetaldehyde of water outlet is less than 10mg/kg.
Water sealed tank is more than 9m apart from vavuum pump vertical height in step (3).
Compared with prior art, the advantage of the invention is that：It is cold that starch sugar evaporation is removed present invention firstly discloses one kind
The method of acetaldehyde in solidifying water, condensed water heating, charcoal absorption and vacuum flashing processing, its simple production process is produced into
This is low, removes acetaldehyde and other smell substance effects substantially, and with the condensed water colorless and odorless obtained by the present invention, conductance is less than 10
μ s/cm, pH value is between 6-7, and acetaldehyde is less than 5mg/kg, and all indexs reach standards for drinking water quality GB5749-
2006 requirement, can use as deionized water (reverse osmosis water), be fed intake for starch, clean of tank wagon, and ion exchange column is again
Give birth to and clean, the technological operation such as chemicals dispensing, reduction factory water consume.
Embodiment
The present invention is described in further detail with reference to embodiments.
Embodiment 1
A kind of method for removing acetaldehyde in starch sugar evaporation condensed water, specifically includes following steps：
(1) condensed water pre-treatment：Collect 1 ton of condensed water after starch sugar evaporation to deposit in head tank, the condensation after testing
Acetaldehyde is 1100mg/kg in water.Exchanged heat using saturated vapor, the condensed water that will be stored in head tank passes through heat exchanger liter
Temperature is to 70 DEG C；
(2) adsorb：The condensed water of condensed water pre-treatment is mixed with activated carbon, activated carbon weight is 0.5kg, after mixing
Adsorption time control 1h, then by being precoated through diatomite after leaf-type filter, remove condensed water in activated carbon；
(3) vacuum flashing：Condensed water through adsorption treatment enters in flash tank, and control flash vacuum degree dodges in -70kPa
Vapor-liquid separation after steam condensation is steamed, fixed gas is discharged by vavuum pump, and condensate liquid is flowed into bottom water sealed tank by pipeline, water seal
Tank is 10m apart from vavuum pump vertical height；
(4) cool：The condensed water after vacuum flashing is cooled to 30 DEG C using heat exchanger and stored.
After testing, the acetaldehyde in condensed water be 4.8mg/kg, colorless and odorless, the μ s/kg of electrical conductivity 7.2, pH value 6.7,
All indexs reach standards for drinking water quality GB5749-2006 requirement, can make as deionized water (reverse osmosis water)
With being fed intake for starch, clean of tank wagon, ion exchange column regeneration and cleaning, the technological operation such as chemicals dispensing reduces plant water
Consumption.
Embodiment 2
(1) condensed water pre-treatment：Collect 1 ton of condensed water after starch sugar evaporation to deposit in head tank, the condensation after testing
Acetaldehyde is 1100mg/kg in water.Exchanged heat using saturated vapor, the condensed water that will be stored in head tank passes through heat exchanger liter
Temperature is to 80 DEG C；
(2) adsorb：The condensed water of condensed water pre-treatment is mixed with activated carbon, activated carbon weight is 1kg, mixed
Adsorption time control 2h, then by being precoated through diatomite after leaf-type filter, remove condensed water in activated carbon；
(3) vacuum flashing：Condensed water through adsorption treatment enters in flash tank, controls flash vacuum degree in -53.9kPa,
Vapor-liquid separation after flash-off steam condensation, fixed gas is discharged by vavuum pump, and condensate liquid is flowed into bottom water sealed tank by pipeline；Water
Sealed cans are 10m apart from vavuum pump vertical height；
(4) cool：The condensed water after vacuum flashing is cooled to 40 DEG C using heat exchanger and stored.
After testing, the acetaldehyde in condensed water be 3.1mg/kg, colorless and odorless, the μ s/kg of electrical conductivity 8.6, pH value 6.5,
All indexs reach standards for drinking water quality GB5749-2006 requirement, can make as deionized water (reverse osmosis water)
With being fed intake for starch, clean of tank wagon, ion exchange column regeneration and cleaning, the technological operation such as chemicals dispensing reduces plant water
Consumption.
Embodiment 3
(1) condensed water pre-treatment：Collect 1 ton of condensed water after starch sugar evaporation to deposit in head tank, the condensation after testing
Acetaldehyde is 1100mg/kg in water.Exchanged heat using saturated vapor, the condensed water that will be stored in head tank passes through heat exchanger liter
Temperature is to 90 DEG C；
(2) adsorb：The condensed water of condensed water pre-treatment is mixed with activated carbon, activated carbon weight is 1.5kg, after mixing
Adsorption time control 3h, then by being precoated through diatomite after leaf-type filter, remove condensed water in activated carbon；
(3) vacuum flashing：Condensed water through adsorption treatment enters in flash tank, controls flash vacuum degree in -31.2kPa,
Vapor-liquid separation after flash-off steam condensation, fixed gas is discharged by vavuum pump, and condensate liquid is flowed into bottom water sealed tank by pipeline；Water
Sealed cans are 10m apart from vavuum pump vertical height；
(4) cool：The condensed water after vacuum flashing is cooled to 50 DEG C using heat exchanger and stored.
After testing, the acetaldehyde in condensed water be 2.1mg/kg, colorless and odorless, the μ s/cm of electrical conductivity 9.5, pH value 6.2,
All indexs reach standards for drinking water quality GB5749-2006 requirement, can make as deionized water (reverse osmosis water)
With being fed intake for starch, clean of tank wagon, ion exchange column regeneration and cleaning, the technological operation such as chemicals dispensing reduces plant water
Consumption.
Described above not limitation of the present invention, the present invention is also not limited to the example above.The art it is common
Technical staff is in the essential scope of the present invention, and change, remodeling, addition or the replacement made should also belong to the protection of the present invention
Scope.
Claims (5)
1. a kind of method for removing acetaldehyde in starch sugar evaporation condensed water, it is characterised in that comprise the following steps that：
(1) condensed water pre-treatment：By the condensation water collection after evaporator evaporation in starch sugar preparation process in a condensate water pot
It is interior, heated using plate type heat exchanger and steam, condensate temperature is risen to 70-90 DEG C；
(2) adsorb：The condensed water that step (1) is obtained is with activated carbon by weight 1000：After 0.5-1.5 ratio mixing, control
Adsorption time processed is 1h-4h, is then filtered to remove activated carbon by scribbling diatomaceous leaf-type filter, during filtering, blade
Input and output material pressure difference≤4bar of filter；
(3) vacuum flashing：In condensed water feeding flash tank after the adsorption treatment that step (2) is obtained, flash vacuum degree is controlled
In -70kPa to -31.2kPa, vapor-liquid separation is carried out after flash-off steam is condensed, fixed gas is discharged by vavuum pump, condensate liquid leads to
Piping is flowed into bottom water sealed tank；
(4) cool：Condensed water in water sealed tank is cooled to 30-50 DEG C and stored.
2. a kind of method for removing acetaldehyde in starch sugar evaporation condensed water according to claim 1, it is characterised in that：Step
(1) starch sugar described in is fructose syrup, glucose syrup or malt syrup.
3. a kind of method for removing acetaldehyde in starch sugar evaporation condensed water according to claim 1, it is characterised in that：Step
(1) the condensed water pre-treatment described in is warming up to 80 DEG C.
4. a kind of method for removing acetaldehyde in starch sugar evaporation condensed water according to claim 1, it is characterised in that：Step
(2) activated carbon used is craboraffin, humidity≤10% in.
5. a kind of method for removing acetaldehyde in starch sugar evaporation condensed water according to claim 1, it is characterised in that：Step
(3) water sealed tank is more than 9m apart from vavuum pump vertical height in.
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| CN107495084B (en) * | 2017-09-08 | 2020-08-18 | 宁波大学 | Method for removing isovaleraldehyde in F55 high fructose corn syrup |
| CN110342656A (en) * | 2018-04-02 | 2019-10-18 | 无锡甜丰食品有限公司 | A kind of condensation water treatment technology for syrup technique |
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| JPH08291091A (en) * | 1995-04-20 | 1996-11-05 | Fuji Photo Film Co Ltd | Purification of recovered methanol and purified methanol |
| US20070284310A1 (en) * | 2006-06-12 | 2007-12-13 | Van Leeuwen Johannes | Method and system for purifying ethanol |
| CN101186347A (en) * | 2007-11-22 | 2008-05-28 | 山东东昌精细化工科技有限公司 | Method for reclaiming low boiling point organic solvent from waste water |
| CN102219660B (en) * | 2011-04-21 | 2013-08-07 | 石家庄新宇三阳实业有限公司 | Method for separating and recycling acetaldehyde |
| CN103724193A (en) * | 2012-10-12 | 2014-04-16 | 北京先锋创新科技发展有限公司 | Technology for producing high-purity acetic acid methyl ester |
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