CN106045163A - Method of adopting MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater - Google Patents
Method of adopting MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater Download PDFInfo
- Publication number
- CN106045163A CN106045163A CN201610432097.2A CN201610432097A CN106045163A CN 106045163 A CN106045163 A CN 106045163A CN 201610432097 A CN201610432097 A CN 201610432097A CN 106045163 A CN106045163 A CN 106045163A
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- Prior art keywords
- benzyl alcohol
- mvr
- waste water
- saline
- vaporizer
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Removal Of Specific Substances (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a method of adopting a MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater. The method includes following steps: delivering wastewater generated by a benzyl alcohol reaction system into a neutralizing kettle for neutralization to enable pH of the wastewater to be 6.5-7; delivering saline after going through neutralization into an adsorption tower for adsorption; enabling saline after adsorption to enter the MVR evaporator for evaporation, enabling generated steam after being compressed by a compressor to return into the MVR evaporator, obtaining MVR recycling water after heat exchange of an evaporation steam phase, delivering the MVR recycling water into the benzyl alcohol reaction system to participate in benzyl alcohol preparation reaction, and subjecting salt after being evaporated and concentrated to centrifugal drying to obtain industrial salt. By using the method, the problem of the benzyl alcohol wastewater, which cannot be solved for a long time, is solved thoroughly. The method is low in energy consumption and has dual effect on economy and environment protection, and emission of treated wastewater is almost zero.
Description
Technical field
The present invention relates to a kind of method using MVR vaporizer to process benzyl alcohol waste water, belong to chemical field.
Background technology
Benzyl alcohol is also referred to as benzylalcohol, be the simplest fatty alcohol containing phenyl it be the water white transparency having faint aromatic odor
Thick liquid, polarized, low toxicity, the feature that steam forces down, therefore it is widely used as solvent and is applied to daily use chemicals, coating, macromolecule
Industry, has environmental protection, the feature that nontoxic, solubility property is good.
The most domestic demand to benzyl alcohol remains a certain degree of stable increment the most every year.2007 domestic
The consumption figure of benzyl alcohol is 8000 tons, and within 2013, domestic consumption amount has reached 25000 tons, and average growth rate per annum, close to 20%, increases
Amount major part is to be pulled by epoxy resin coating and diluent industry；In international market, experienced by the painting peculiar to vessel of 2008-2012 years
After material low ebb, the recovery sign of ship coatings in 2013 and epoxy resin coating is day by day obvious, and demand increases the most increasingly, in advance
Meter benzyl alcohol will maintain the average growth rate per annum of 10% 20% in the coming years.
The main technique of domestic production benzyl alcohol is, with benzyl chloride as raw material, under the catalytic action of alkali, add pyrohydrolysis and
?.This technique can produce substantial amounts of waste water, and this waste water is light brown liquid, has dense aldehyde taste and benzyl chloride abnormal smells from the patient, mainly pollutes
The content of thing benzylalcohol is 3-5%, pH value 9-11, and the comprehensive COD value of waste water is about 50,000, and the pollution of this wastewater in waters
Property very big, aromatic ring is difficult to degraded, is typical difficult waste water, and its processing method is domestic rarely has report.Anticipated current domestic often
The generation amount of year this waste water is 80-100 ten thousand tons, and in cumulative year after year trend.All the time, the process of this waste water is that each benzylalcohol is raw
Produce producer and the important problem of environmental administration, though there being a lot of unit to use chemical method to process with biological method, but these
Processing method cost is the highest or treatment effect is bad and finally abandons.
In alkaline hydrolysis benzylalcohol technique, the processing mode of benzylalcohol waste water is mainly at present: first by waste water resin absorption, then use
Methanol resolves, and reclaims the part benzylalcohol being dissolved in water, and the waste water after absorption send sewage treatment plant directly to discharge after processing.This skill
Art emphasis is to reclaim after benzylalcohol, and resin absorption in waste water containing methanol, soda and other partial organic substances, solves the most at all
Certainly wastewater problem, the addition of methanol has increased the weight of the intractability of sewage, causes the sewage of discharge to cause environment greatly dirty
Dye.
It is therefore desirable to design a kind of method using MVR vaporizer to process benzyl alcohol waste water, to overcome the problems referred to above.
Summary of the invention
It is an object of the invention to overcome the defect of prior art, it is provided that a kind of employing MVR vaporizer processes benzyl alcohol
The method of waste water, the method solves this long-term unsolved problem of benzylalcohol waste water up hill and dale, and the energy consumption of the method is low, place
After reason, wastewater discharge is almost nil, has economy, environmental protection double effects.
The present invention is achieved in that
The present invention provides a kind of method using MVR vaporizer to process benzyl alcohol waste water, comprises the following steps: reacted by benzyl alcohol
The waste water that system produces is delivered to neutralize in still, is neutralized reaction so that it is pH is 6.5-7；By the saline through neutralizing reaction
It is delivered in adsorption tower adsorb；Saline after absorption enters MVR vaporizer and is evaporated, and the steam of generation is through compressor pressure
Returning again in described MVR vaporizer after contracting, evaporation vapour phase obtains MVR recycle-water after heat exchange, and MVR recycle-water is delivered to benzyl alcohol
Response system participates in benzyl alcohol preparation reaction, and the salt after evaporation and concentration is dried by centrifugation, obtains Nacl.
Further, after neutralizing reaction, reclaiming upper strata Organic substance, lower floor's saline is delivered to adsorption tower.
Further, in adsorption tower, use resin absorption benzyl alcohol, use methanol to resolve, by distillation and rectification
Obtaining finished product benzyl alcohol, methanol then recycles.
Further, the saline entering MVR vaporizer need to be heated to more than 80 DEG C.
Further, in MVR vaporizer, saline, under vacuum to 40KPa-50KPa, is evaporated under reduced pressure.
The method have the advantages that
Saline after absorption enters MVR vaporizer and is evaporated, and the steam of generation returns again in described MVR after compressor compresses
Vaporizer, the MVR recycle-water that evaporation vapour phase obtains after heat exchange is delivered to benzyl alcohol response system and participates in benzyl alcohol preparation reaction,
Salt after evaporation and concentration is dried by centrifugation, obtains commodity Nacl.The employing MVR vaporizer that the present invention provides processes benzyl alcohol
The method of waste water solves this long-term unsolved problem of benzylalcohol waste water up hill and dale, and the energy consumption of this method is low, useless after process
Water discharge capacity is almost nil, has economy, environmental protection double effects.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
The flow chart of a kind of method using MVR vaporizer to process benzyl alcohol waste water that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of not making creative work all its
Its embodiment, broadly falls into the scope of protection of the invention.
Such as Fig. 1, the embodiment of the present invention provides a kind of method using MVR vaporizer to process benzyl alcohol waste water, including following
Step:
It is delivered to neutralize in still by the waste water that benzyl alcohol response system produces, is neutralized reaction so that it is pH is 6.5-7, at this
In preferred embodiment, using technical hydrochloric acid to be neutralized, after neutralizing reaction, reclaim upper strata Organic substance, lower floor's saline is delivered to inhale
Attached tower.
By being delivered in adsorption tower adsorb through the saline of neutralization reaction, reclaim benzyl alcohol.In adsorption tower, use
Resin absorption benzyl alcohol, uses methanol to resolve, obtains finished product benzyl alcohol by distillation and rectification, and methanol then carries out reclaiming profit
With.
Saline after absorption enters MVR vaporizer and is evaporated, enter the saline of MVR vaporizer need to be heated to 80 DEG C with
On, in MVR vaporizer, saline, under vacuum to 40KPa-50KPa, is evaporated under reduced pressure.The steam produced is through compressor pressure
Return again to after contracting in described MVR vaporizer, thus reach thermal balance.Evaporation vapour phase obtains MVR recycle-water after heat exchange, and MVR returns
Receiving water and be delivered to the participation benzyl alcohol preparation reaction of benzyl alcohol response system, the salt after evaporation and concentration is dried by centrifugation, obtains work
Industry salt.
First benzylalcohol (benzyl alcohol) waste water hydrochloric acid is neutralized, removes the soda of reaction excess, the saline after neutralizing
Benzylalcohol in adsorption tower recycle-water, then be evaporated delivering to MVR vaporizer after waste water preheating, the steam that evaporation produces is through pressure
Contracting machine is the most anticaustic in the evaporation of system after compressing, thus reaches thermal balance.Evaporation vapour phase is recycled water, these times after heat exchange
Receive water for choline.Salt after concentration machine by centrifugation is centrifuged, then is dried to obtain commodity Nacl with exsiccator, and mother solution goes back to MVR system
System recycles.Present invention achieves the recycling of wastewater zero discharge and benzyl alcohol.
Low-pressure steam concentrated by the compressor of MVR vaporizer, heats to saline after being changed to above steam again, and saline produces
Steam enters back into compressor cycle, and ordinary circumstance compression function is maintained the heat balance of system, and system temperature can keep stable.
But when winter, system heat losses was bigger, suitable steam that saline is reheated, maintain heat balance.
The present invention provide employings MVR vaporizer process benzyl alcohol waste water method solve up hill and dale benzylalcohol waste water this
Long-term unsolved problem, the energy consumption of this method is low, and processed waste water discharge capacity is almost nil, has economy, environmental protection dual
Effect.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. one kind uses the method that MVR vaporizer processes benzyl alcohol waste water, it is characterised in that comprise the following steps:
It is delivered to neutralize in still by the waste water that benzyl alcohol response system produces, is neutralized reaction so that it is pH is 6.5-7；
To be delivered in adsorption tower adsorb through the saline of neutralization reaction；
Saline after absorption enters MVR vaporizer and is evaporated, and the steam of generation returns again in described MVR after compressor compresses
Vaporizer, evaporation vapour phase obtains MVR recycle-water after heat exchange, and MVR recycle-water is delivered to benzyl alcohol response system and participates in benzyl alcohol
Preparation reaction, the salt after evaporation and concentration is dried by centrifugation, obtains Nacl.
A kind of method using MVR vaporizer to process benzyl alcohol waste water the most as claimed in claim 1, it is characterised in that: neutralize
After reaction, reclaiming upper strata Organic substance, lower floor's saline is delivered to adsorption tower.
A kind of method using MVR vaporizer to process benzyl alcohol waste water the most as claimed in claim 1 or 2, it is characterised in that: inhale
In attached tower, use resin absorption benzyl alcohol, use methanol to resolve, obtain finished product benzyl alcohol, methanol by distillation and rectification
Then recycle.
A kind of method using MVR vaporizer to process benzyl alcohol waste water the most as claimed in claim 3, it is characterised in that: enter
The saline of MVR vaporizer need to be heated to more than 80 DEG C.
A kind of method using MVR vaporizer to process benzyl alcohol waste water the most as claimed in claim 4, it is characterised in that: at MVR
In vaporizer, saline, under vacuum to 40KPa-50KPa, is evaporated under reduced pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610432097.2A CN106045163A (en) | 2016-06-17 | 2016-06-17 | Method of adopting MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610432097.2A CN106045163A (en) | 2016-06-17 | 2016-06-17 | Method of adopting MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater |
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| CN106045163A true CN106045163A (en) | 2016-10-26 |
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| CN201610432097.2A Pending CN106045163A (en) | 2016-06-17 | 2016-06-17 | Method of adopting MVR (mechanical vapor recompression) evaporator to treat benzyl alcohol wastewater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108130188A (en) * | 2018-01-12 | 2018-06-08 | 潜江新亿宏有机化工有限公司 | A kind of process for purification of fragrance benzyl acetate |
| CN109516622A (en) * | 2018-11-16 | 2019-03-26 | 山东聊城中盛蓝瑞化工有限公司 | The treatment process of high-salt wastewater in a kind of benzyl alcohol production system |
| CN111675414A (en) * | 2020-06-24 | 2020-09-18 | 潜江新亿宏有机化工有限公司 | Wastewater treatment method for benzyl alcohol industrial production |
| CN115536492A (en) * | 2022-09-29 | 2022-12-30 | 潜江新亿宏有机化工有限公司 | Benzyl alcohol production method and device for reducing consumption of soda ash |
Citations (2)
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| CN101973660A (en) * | 2010-09-21 | 2011-02-16 | 浙江大学 | Recycling and pretreatment methods of raw materials containing benzene thiazole alcohol pesticide industrial wastewater |
| US20130319946A1 (en) * | 2012-05-29 | 2013-12-05 | Indian Institute Of Technology Kanpur | Bi-metal nanoadsorbents and methods for their preparation and use |
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2016
- 2016-06-17 CN CN201610432097.2A patent/CN106045163A/en active Pending
Patent Citations (2)
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|---|---|---|---|---|
| CN101973660A (en) * | 2010-09-21 | 2011-02-16 | 浙江大学 | Recycling and pretreatment methods of raw materials containing benzene thiazole alcohol pesticide industrial wastewater |
| US20130319946A1 (en) * | 2012-05-29 | 2013-12-05 | Indian Institute Of Technology Kanpur | Bi-metal nanoadsorbents and methods for their preparation and use |
Non-Patent Citations (1)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108130188A (en) * | 2018-01-12 | 2018-06-08 | 潜江新亿宏有机化工有限公司 | A kind of process for purification of fragrance benzyl acetate |
| CN109516622A (en) * | 2018-11-16 | 2019-03-26 | 山东聊城中盛蓝瑞化工有限公司 | The treatment process of high-salt wastewater in a kind of benzyl alcohol production system |
| CN109516622B (en) * | 2018-11-16 | 2022-03-04 | 聊城鲁西氯苄化工有限公司 | Treatment process of high-salt wastewater in benzyl alcohol production system |
| CN111675414A (en) * | 2020-06-24 | 2020-09-18 | 潜江新亿宏有机化工有限公司 | Wastewater treatment method for benzyl alcohol industrial production |
| CN115536492A (en) * | 2022-09-29 | 2022-12-30 | 潜江新亿宏有机化工有限公司 | Benzyl alcohol production method and device for reducing consumption of soda ash |
| CN115536492B (en) * | 2022-09-29 | 2023-12-19 | 潜江新亿宏有机化工有限公司 | Benzyl alcohol production method and device for reducing sodium carbonate consumption |
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Application publication date: 20161026 |