CN105198702B - A kind of method for reducing butylene aldehyde in polyvinyl alcohol production process - Google Patents
A kind of method for reducing butylene aldehyde in polyvinyl alcohol production process Download PDFInfo
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- CN105198702B CN105198702B CN201510682376.XA CN201510682376A CN105198702B CN 105198702 B CN105198702 B CN 105198702B CN 201510682376 A CN201510682376 A CN 201510682376A CN 105198702 B CN105198702 B CN 105198702B
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- methanol
- crotonaldehyde
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- butylene
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/88—Separation; Purification; Use of additives, e.g. for stabilisation by treatment giving rise to a chemical modification of at least one compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F116/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F116/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F116/04—Acyclic compounds
- C08F116/06—Polyvinyl alcohol ; Vinyl alcohol
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Abstract
The invention discloses a kind of method for reducing butylene aldehyde in methanol, this method is to use the reaction distillation method under alkalescence condition to reduce the butylene aldehyde for entering solvent methanol in polyvinyl alcohol production process；Specially：The strong base solution that concentration expressed in percentage by volume is 20% is added into the methanol containing crotonaldehyde, percentage by weight≤0.008% of the distillation to crotonaldehyde in methyl alcohol under the conditions of 65-70 DEG C；The addition of the sodium hydroxide is 0.01-the 0.5% of methanol weight.The inventive method process is simple, and will not produce pollution.
Description
Technical field
The invention belongs to chemical technology field, is related to the method for reducing butylene aldehyde in methanol.
Background technology
Polyvinyl alcohol（PVA）It is a kind of important water-soluble high-molecular compound to grow up early 1950s.
It using quite varied, can be used to produce fiber, can also serve as chemical ＆ blended fabric slurry, coating, adhesive, emulsifying agent, papermaking processing
Auxiliary agent etc..
Polyvinyl alcohol（PVA）The synthesis of production process including vinyl acetate resin (VAC), vinyl acetate resin（VAC）Essence
System, vinyl acetate resin（VAC）Polymerization, the alcoholysis of polyvinyl acetate (PVAC) and five portions such as recovery of methanol and acetic acid
Point,
Producing polyvinyl alcohol as raw material using acetylene and acetic acid mainly has three chemical reaction processes：
（1）Acetylene and acetic acidreaction generation vinyl acetate resin (VAC)
C2H2+7 L* C- ]5 Uj p0 |5 TCH3COOH 4 R, {7 U9 w6 Y' s'==CH3COOCHCH2
（2）Vinyl acetate resin (VAC) polymerization generation polyvinyl acetate (PVAC)（Using methanol as solvent）
n CH3COOCHCH2===（CH3COOCHCH2）n
（3）Polyvinyl acetate (PVAC) alcoholysis generates polyvinyl alcohol（PVA）(using sodium hydroxide as catalyst, methanol is
Solvent)
（CH3COOCHCH2）n + CH3OH=== （CH2CHOH）n + nCH3COOCH
In addition to above three main chemical reactions, also there occurs a series of side reaction, the caused impurity of side reaction
Have, acetaldehyde, acetone, vinylacetylene, benzene, methyl acetate, oxalic acid Asia second fat, crotonaldehyde, acetic anhydride etc..These impurity are in essence
Largely it is removed during system, but still the impurity such as some crotonaldehyde enters solvent（Methanol）In.Bring into methanol
Crotonaldehyde is difficult to separate with the method for distillation.And constantly accumulated in production system.
On the one hand crotonaldehyde is the inhibitor of vinyl acetate resin (VAC) polymerisation, another aspect crotonaldehyde brings product into
In can influence polyvinyl alcohol（PVA）Degree of staining.So the crotonaldehyde in methanol is strictly controlled in polyvinyl alcohol production process
Content, it is desirable to which butylene aldehyde is less than 0.008%.
Patent 200910069254.8 discloses a kind of purification process of methanol, at a certain temperature by methanol and peroxide
Change hydrogen（Or potassium permanganate）Reaction distillation is carried out, then adds the excessive hydrogen peroxide of hydrogenation calcium reduction（Or potassium permanganate）, obtain
To the methanol of high-purity.Wang Zhongyin etc. have studied the method that impurity in methanol is removed with potassium permanganate.Xue Yunlian etc. have studied use
The method of Low Molecular Weight Aldehydes ketone in cationic exchange resin adsorption methanol.These methods can preferably remove the acetaldehyde third in methanol
The materials such as ketone, it can be difficult to removing the crotonaldehyde in methanol.
The content of the invention
A kind of it is contemplated that overcome the deficiencies in the prior art, there is provided method for reducing butylene aldehyde in methanol.
In order to achieve the above object, technical scheme provided by the invention is：
The method of butylene aldehyde is to use the reaction distillation method under alkalescence condition to reduce polyethylene in the reduction methanol
Enter the butylene aldehyde of solvent methanol during alcohol production；Specially：Volume basis is added into the methanol containing crotonaldehyde
Concentration is 20% strong base solution, preferably sodium hydroxide or potassium hydroxide solution, more preferably sodium hydroxide solution, the butylene
Mass percentage content >=0.1% of aldehyde in methyl alcohol, weight hundred of the distillation to crotonaldehyde in methyl alcohol under the conditions of 65-70 DEG C
Divide ratio≤0.008%, preferably distill 30-60min；The addition of the sodium hydroxide is 0.01-the 0.5% of methanol weight.Institute
Distillation is carried out in reactive distillation column under the conditions of stating 65-70 DEG C, and tower top temperature is 65-70 DEG C, bottom temperature 100-108
℃。
The invention will be further described below：
When the present invention is applied in polyvinyl alcohol actual production, the hydroxide that volume percent content is 20% is first prepared
Sodium；Then solvent during polyvinyl alcohol is produced（Methanol）Some or all feeding reactive distillation columns of the distillate of destilling tower
In, while adding 20% sodium hydroxide, the addition of sodium hydroxide is 0.01-the 5.0% of methanol weight, carries out reaction distillation, makes
By the use of steam as thermal source, tower top temperature is 65-70 DEG C, 100-108 DEG C of bottom temperature（Primarily to prevent methanol from tower reactor
Outflow, methanol is set all to seethe with excitement）, make reactive distillation column distillate（Methanol）The content of middle crotonaldehyde is less than 0.008%；With anti-
The continuous progress that should be distilled, solvent（Methanol）The crotonaldehyde of system can be reduced constantly, until less than 0.008%, can now subtract
The addition of few sodium hydroxide（Mainly from the point of view of economy, the consumption of sodium hydroxide is reduced；For example, work as sodium hydroxide
Addition be 4.0%, after distillation the content of crotonaldehyde be 0.003% when, the addition of sodium hydroxide can be reduced to
2.0%, as long as the content of crotonaldehyde is no more than 0.008% can after distillation）；Finally, the discharge of reactive distillation column tower reactor is hydrogeneous
Sodium oxide molybdena waste water is neutralized to neutrality with sulfuric acid.
The inventive method is reduced in polyvinyl alcohol production process into molten by using the reaction distillation method under alkalescence condition
The butylene aldehyde of agent methanol, process is simple, and will not produce pollution.
Embodiment
Embodiment 1
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0. 146%
, 100 grams of the sample is then taken, is put into 150 milliliters of distilling flask, adds the hydroxide that volume percent content is 20%
2.5 grams of sodium water solution, 30-60min of distillation in the water-bath of 65-72 degree is placed in, collects distillate in vial, detection distillates
Butylene aldehyde 0.002% in liquid.
Test result indicates that：The content of crotonaldehyde is 0.146% before experiment, does cleanser purification reaction with sodium hydroxide and steams
The content for evaporating rear crotonaldehyde is 0.002%.
Embodiment 2
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0. 13%
, 100 grams of the sample is then taken, is put into 150 milliliters of distilling flask, adds the hydroxide that volume percent content is 20%
1.5 grams of sodium water solution, 30-60min of distillation in the water-bath of 65-72 degree is placed in, collects distillate in vial, detection distillates
Butylene aldehyde in liquid is 0.006%.
Test result indicates that：The content of crotonaldehyde is 0.13% before experiment, after doing cleanser purification reaction distillation with sodium oxide molybdena
The content of crotonaldehyde is 0.006%.
Embodiment 3
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0.11%,
Then 100 grams of the sample is taken, is put into 150 milliliters of distilling flask, adds the sodium hydroxide that volume percent content is 20%
1.5 grams of the aqueous solution, 30-60min of distillation in the water-bath of 65-72 degree is placed in, collects distillate in vial, detect distillate
In butylene aldehyde be 0.005%.
Test result indicates that：The content of crotonaldehyde is 0.11% before experiment, and cleanser purification reaction distillation is done with sodium hydroxide
The content of crotonaldehyde is 0.005% afterwards.
Embodiment 4
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0.12%,
Then 100 grams of the sample is taken, is put into 150 milliliters of distilling flask, adds 0.5 gram of potassium permanganate, is placed in the water of 65-72 degree
Distilled 30-60 minutes in bath, collect distillate in vial, it is 0.12% to detect the butylene aldehyde in distillate.
Embodiment 5
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0.12%,
Then 100 grams of the sample is taken, is put into 150 milliliters of distilling flask, adds activated good cationic ion-exchange resin 20
Gram, 30-60min of distillation in the water-bath of 65-72 degree is placed in, distillate is collected in vial, detects the crotonaldehyde in distillate
Content is 0.12%.
Embodiment 4 and 5 test result indicates that：Polyvinyl alcohol can not be reduced with potassium permanganate and cationic ion-exchange resin to give birth to
The butylene aldehyde of solvent during production.
Embodiment 6
Take the solvent of polyvinyl alcohol production scene（Methanol）Sample, use gas chromatographic detection：Butylene aldehyde is 0. 146%
, 100 grams of the sample is then taken, is put into 150 milliliters of distilling flask, adds the hydroxide that volume percent content is 20%
2.0 grams of aqueous solutions of potassium, 30-60min of distillation in the water-bath of 65-72 degree is placed in, collects distillate in vial, detection distillates
Butylene aldehyde 0.0024% in liquid.
Test result indicates that：The content of crotonaldehyde is 0.146% before experiment, does cleanser purification reaction with sodium hydroxide and steams
The content for evaporating rear crotonaldehyde is 0.0024%.
Claims (1)
- A kind of 1. method for reducing butylene aldehyde in methanol, it is characterised in that dropped using the reaction distillation method under alkalescence condition Enter the butylene aldehyde of solvent methanol during oligomerisation of ethylene alcohol production；Specially：Added into the methanol containing crotonaldehyde Concentration expressed in percentage by volume is 20% highly basic sodium hydroxide solution, weight of the distillation to crotonaldehyde in methyl alcohol under the conditions of 65-70 DEG C Measure percentage≤0.008%；The addition of the sodium hydroxide is 0.01-the 0.5% of methanol weight；65-70 DEG C of conditions Lower distillation is carried out in reactive distillation column, and tower top temperature is 65-70 DEG C, 100-108 DEG C of bottom temperature.
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