KR101838815B1 - Apparatus and method for recovery unreacted monomer - Google Patents

Abstract

The present invention provides an apparatus for recovering unreacted monomers. According to an embodiment of the present invention, the apparatus for recovering unreacted monomers comprises: a stripping column in which unreacted monomers are absorbed from polymers containing unreacted monomers into steam to generate saturated steam; a first condenser for condensing the saturated steam by using cooling water; a decanter for separating the saturated steam condensed by the first condenser into water and monomers; and a compressor for increasing temperature and pressure of the cooling water used in the first condenser, wherein the water is supplied as the cooling water, and the cooling water whose temperature and pressure are raised through the first condenser and the compressor is supplied as the steam.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for recovering unreacted monomers,

The present invention relates to an unreacted monomer recovery apparatus and recovery method, and more particularly, to an unreacted monomer recovery apparatus and recovery method with improved unreacted monomer recovery efficiency.

The competition in the plastics industry is intensifying due to relatively low entry barriers relative to other petrochemical industries. Until now, many companies in Korea have been leading the market with high quality competitiveness, but the difference in quality competitiveness is disappearing due to the rapid development of the latter countries, resulting in a decrease in the quality level gap.

Therefore, it is considered to develop high value-added materials with special functions and to secure cost competitiveness of existing products as a way to gain product competitiveness.

In the case of general-purpose products, which occupy an absolute share of the plastics industry, it is very important to secure cost competitiveness of existing products.

On the other hand, in the case of plastics, the unreacted monomers remaining in the product after the polymerization reaction may adversely affect the quality of the product, and may be recovered through a separate process to improve the quality of the product and reuse the recovered monomers, Saving.

As a method of recovering unreacted monomers, the most commonly applied techniques are steam stripping and air stripping. Among them, manufacturing costs are increased due to the use of a large amount of steam and cooling water used in steam stripping .

Disclosure of Invention Technical Problem [8] The present invention provides an unreacted monomer recovery apparatus and recovery method which are excellent in recovery efficiency of unreacted monomers.

According to an embodiment of the present invention, there is provided a method for recovering saturated steam from a polymer containing unreacted monomers, the method comprising: a deodorization tower in which the unreacted monomer is absorbed in steam to generate saturated steam, A decanter for separating the saturated steam condensed by the first condenser into water and monomers and a condenser for increasing the temperature and pressure of the cooling water used in the first condenser, Wherein the water is supplied as the cooling water, and the cooling water whose temperature and pressure have been increased through the first condenser and the compressor is supplied to the steam, thereby providing an unreacted monomer recovery device.

And a second condenser located between the first condenser and the decanter for further cooling the saturated steam condensed by the first condenser.

And a third condenser located between the second condenser and the decanter for further condensing the monomer.

And a reservoir for separately storing the water and the monomer.

The reservoir may include a vacuum pump.

And a valve for controlling the pressure of the water supplied to the first condenser and the compressor, the valve being located between the reservoir and the first condenser.

The polymer may be ABS (acrylonitrile butadiene styrene) polymer, and the unreacted monomer may be styrene.

According to another embodiment of the present invention, there is provided a method for producing a polymer electrolyte membrane, which comprises the steps of forming a saturated steam by absorbing the unreacted monomer from a polymer containing an unreacted monomer in steam, Separating the saturated steam condensed by the first condenser into water and monomers using a decanter and using the compressor to adjust the temperature and the temperature of the cooling water used in the first condenser, Wherein the water is supplied as the cooling water, and the cooling water whose temperature and pressure are raised through the first condenser and the compressor is supplied to the steam.

The location between the first condenser and the decanter may further comprise the step of further cooling the saturated steam condensed by the first condenser using a second condenser.

As described above, in the unreacted monomer recovery apparatus and the recovery method according to the embodiment of the present invention, the recovered water can be recycled as cooling water and recycled as steam using a compressor to increase the recovery efficiency of unreacted monomers.

1 is a process diagram of an unreacted monomer recovery apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, since the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to those shown in the drawings. In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

Also, throughout the specification, when an element is referred to as "including" an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Hereinafter, an unreacted monomer recovery apparatus and a recovery method according to an embodiment of the present invention will be described in detail with reference to FIG.

1 is a process diagram of an unreacted monomer recovery apparatus according to an embodiment of the present invention.

1, the apparatus for recovering unreacted monomer according to an embodiment of the present invention includes a stripping tower 200, a first condenser 210, a second condenser 213, a third condenser 216, a decanter 220 A reservoir 230, and a compressor 240.

First, the polymer 110 and the steam 115 are supplied to the stripping tower 200.

Here, the polymer 110 may be a polymer in the form of a latex including unreacted monomers.

As an example, the polymer 110 may be an ABS (acrylonitrile butadiene styrene) polymer, wherein the unreacted monomer may be styrene.

Inside the stripping tower 200, the polymer 110 and the steam 116 are countercurrently contacted.

The steam 116 absorbs the unreacted monomer contained in the polymer 110 to generate the saturated steam 120 and is discharged to the upper part of the deodorization tower 200. The unreacted monomer- 200).

The polymer 130 from which the unreacted monomer discharged to the lower part of the stripping tower 200 is removed can be produced as a final product after dehydration and drying.

The operation temperature of the stripping tower 200 can be operated in various temperature ranges depending on the type of the polymer 110 to be introduced.

The saturated steam 120 is sent to the first condenser 210 to separately separate unreacted monomers in a gaseous state and may undergo a first condensation process in the first condenser 210.

The saturated steam 120 which has undergone the first condensation process in the first condenser 210 is transferred to the second condenser 213 and undergoes a second condensation process in the second condenser 213 so that the saturated steam 120 It can be further cooled.

The saturated steam 120 passing through the first condenser 210 and the second condenser 213 is introduced into a decanter 220 and centrifuged by the water 125 and the monomer 127 to be supplied to the reservoir 230 ). ≪ / RTI >

At this time, the monomer 127 may undergo additional condensation through the third condenser 216, and the reservoir 230 may further include a vacuum pump 235.

The monomer 127 separated and stored in the reservoir 230 may be separately recovered and recycled to the polymer 110 manufacturing process.

Some of the separated water 125 stored in the reservoir 230 may be treated as wastewater and at least a portion may be re-supplied to the first condenser 210 to be used as cooling water.

The first condenser 210 and the compressor 240 may further include a valve 245 between the reservoir 230 and the first condenser 210 to adjust the pressure of the water 125 supplied to the first condenser 210 and the compressor 240 .

In the process of being supplied to the first condenser 210 and used as cooling water, the water 125 whose temperature has been raised due to the latent heat of the saturated steam 120 is further raised in temperature and pressure by using the compressor 240 And the steam 115 used in the stripping tower 200.

Generally, due to the low pressure and temperature of the latent heat of the saturated steam 120 passing through the first condenser 210, the water 125 is difficult to be used as the steam 115 supplied to the deodorizer 200, The unreacted monomer recovery apparatus according to the present invention can provide a proper pressure and temperature condition for reuse with the steam 115 by using the compressor 240.

In general, since the water 125 recovered through the first condenser 210 is somewhat higher in temperature to be recycled as the cooling water, the second condenser 213 is additionally disposed so that the water 125 is cooled Because additional cooling steps are carried out at appropriate temperature levels to be used, appropriate temperature conditions for re-use as cooling water can be achieved.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

Example

An ABS polymer containing unreacted styrene was injected into an unreacted monomer recovery apparatus according to an embodiment of the present invention and centrifuged with water and styrene.

The results of measurement of constituent components, temperature, pressure, vapor fraction, and enthalpy at each position are shown in Tables 1 and 2 below.

Here, the enthalpy is a value calculated by setting the element at 25 ° C and 1 bar at the reference state of enthalpy 0 according to the Aspenplus method.

The input polymer Saturated steam First condenser passing steam Second condenser passing steam First condenser feed water matter
(kmol / h) water 1,087.7 208.1 208.1 208.1 201.1 Styrene 3.4 1.8 1.8 1.8 0.0 utility
(ton / h) cooling water - - - - - Temperature (℃) 65.0 62.7 57.9 30.0 30.0 Pressure (bara) 2.94 0.18 0.18 0.18 0.14 Evaporation fraction 0 One 0 0 0 Enthalpy (MJ / h) - -49,790 -58,765 -59,213 -57,387

The first condenser passing water Compressor passing water
(steam) The recovered styrene Wastewater The second condenser matter
(kmol / h) water 201.0 201.0 0.036 7.0 - Styrene 0.00 0.00 1.8 0.0 - utility
(ton / h) cooling water - - - - 3.2 Temperature (℃) 55.8 84.9 30.0 30.0 18 Pressure (bara) 0.14 0.18 0.18 0.18 4.41 Evaporation fraction One One 0 0 0 Enthalpy (MJ / h) -48,412 -48,214 0.172 -1998 -50,857

Comparative Example

The ABS polymer containing unreacted styrene as the upper part of the stripping tower is condensed by using a single condenser and then centrifuged with water and styrene as a decanter Respectively.

In this case, the results of measurement of constituent components, temperature, pressure, vapor fraction and enthalpy at each position are shown in Table 3 below.

Here, the enthalpy is a value calculated by setting the element at 25 ° C and 1 bar at the reference state of enthalpy 0 according to the Aspenplus method.

The input polymer Input steam Saturated steam Condenser The recovered styrene matter
(kmol / h) water 1,087.7 194.2 208.1 - 0.0 Styrene 3.4 - 1.8 - 1.8 utility
(ton / h) cooling water - - - 60.0 - Temperature (℃) 65.0 135.0 63.0 18.0 23.0 Pressure (bara) 2.94 1.96 0.18 - 1.01 Evaporation fraction 0 One One 0 0 Enthalpy (MJ / h) - -46,256 -49,790 - -

As can be seen from Tables 1 to 3, the unreacted monomer collecting apparatus according to the embodiment of the present invention is different from the comparative example in that the necessary steam is produced and used. As a result, the amount of steam and the amount of cooling water As well as the fact that it has been significantly reduced. That is, unlike the comparative example, the unreacted monomer recovery device according to the embodiment does not require additional supply of steam, and the amount of the cooling water can be reduced to about 5% of that of the comparative example.

In addition, it was confirmed that the embodiment can have the same recovery rate of unreacted styrene as the comparative example while reducing the use of steam and cooling water.

As described above, in the unreacted monomer recovery apparatus and the recovery method according to the embodiment of the present invention, the recovered water can be recycled as cooling water and recycled as steam using a compressor to increase the recovery efficiency of unreacted monomers.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

200: demounting tower 210: first condenser
213: second condenser 216: third condenser
220: Decanter 230: Storage tank
235: Vacuum pump 240: Compressor
245: Valve 110: Polymer
120: Saturated steam 115: Steam
125: water 127: monomer

Claims (10)

A deasphalting tower in which unreacted monomers are absorbed from steam to generate saturated steam from a polymer containing unreacted monomers,
A first condenser for condensing the saturated steam transferred from the demixing tower using cooling water,
A decanter for separating said saturated steam condensed by said first condenser into water and monomer, and
And a compressor for raising the temperature and pressure of the cooling water used in the first condenser,
Wherein the water is supplied as the cooling water,
The cooling water whose temperature and pressure are increased through the first condenser and the compressor is supplied to the steam,
The polymer is an ABS (acrylonitrile butadiene styrene) polymer,
Wherein the unreacted monomer is styrene. The method of claim 1,
A second condenser located between the first condenser and the decanter,
Further comprising a second condenser for further cooling said saturated steam condensed by said first condenser. 3. The method of claim 2,
A second condenser disposed between the first condenser and the decanter,
Further comprising a third condenser for further condensing the monomer. 3. The method of claim 2,
Further comprising a reservoir for separately storing the water and the monomer. 5. The method of claim 4,
Wherein the reservoir comprises a vacuum pump. 5. The method of claim 4,
A second condenser located between said reservoir and said first condenser,
Further comprising a valve for regulating the pressure of the water supplied to the first condenser and the compressor. delete Absorbing said unreacted monomers from the polymer containing unreacted monomers in the stripping tower to form and discharge saturated steam,
Condensing the saturated steam using a first condenser to which cooling water is supplied,
Separating the saturated steam condensed by the first condenser into water and monomers using a decanter, and
Increasing the temperature and pressure of the cooling water used in the first condenser by using a compressor,
Wherein the water is supplied as the cooling water,
The cooling water whose temperature and pressure are increased through the first condenser and the compressor is supplied to the steam,
The polymer is an ABS (acrylonitrile butadiene styrene) polymer,
Wherein the unreacted monomer is styrene. 9. The method of claim 8,
Further comprising cooling the saturated steam condensed by the first condenser using a second condenser, the location between the first condenser and the decanter further cooling the saturated steam condensed by the first condenser using a second condenser. delete

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