JPS58159803A - Evaporating and distilling device - Google Patents

Abstract

PURPOSE:To improve the rate of recovering low b.p. components by circulating working fluid between a concentration vessel and an evaporator for the working fluid, and conducting the evaporated low b.p. components in the vapor of the liquid to be concd. into the evaporator and condensing the same. CONSTITUTION:The liquid to be concd., which is supplied into a concentration vessel 1 through its liquid inlet 12, is heated by the vapor of working fluid, and the concd. liquid is discharged through a liquid outlet 13. At the same instant, the evaporated vapor is supplied into a distillation column 2, where low b.p. components are distilled and the distillate is supplied to the heating side of an evaporator 3 for the working fluid. The distillate is subjected to heat exchange with the working fluid there and is thereby condensed. The condensed distillate is recovered as condensate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an evaporation/distillation apparatus for concentrating a liquid to be concentrated, and for distilling and recovering low-boiling components separated by evaporation.

Substances that dislike bulk and airiness, such as fruit juice and coffee, need to be concentrated at low temperatures, and conventionally single-effect evaporators have been used for concentration at low temperatures.

There has been almost no recovery of low boiling point components in the generated steam.

However, low-boiling components with aromas such as flavors and AcI-w contained in fruit juice, coffee, and fragrances volatilize together with the generated steam during the concentration process, so it is necessary to recover these aromatic components. . Furthermore, these liquids to be concentrated generally undergo denaturation and deterioration in high-temperature air F, impairing their quality, so the concentration ζ process dislikes high @. Furthermore, since volatile components increase at high temperatures, it is preferable to avoid high temperatures.

For this reason, it has become necessary to perform concentration at low temperatures and recovery of low-boiling components. Here.

To recover the low boiling point components, the gas of the low boiling point components obtained by distillation is guided to the heating side of the evaporator, condensed, and recovered as a condensate. However, in order to evaporate - group - at low temperature in the concentrator, it is necessary to reduce the pressure, and in order to perform one pressure reduction, a vacuum pump is used to remove the non-condensing from the heated side chamber of the evaporator, which is connected to the evaporation measurement of the concentrator. I have to let the gas out. At this time, the low boiling point component gas is also extracted, resulting in large losses and poor recovery of the low boiling point components.

To prevent this, it is necessary to lower the extraction temperature below the evaporation saturation temperature to sufficiently condense uncondensed low-boiling components.

However, this requires a particularly low-temperature source for cooling, which requires energy to produce this low @11 (for example, cold water produced by a refrigerator).

Further, the energy required for heating in the #II compactor was wasted in the cooling water, resulting in a large amount of wasted energy.

The present invention overcomes the above-mentioned drawbacks of conventional products, allows high-quality products to be obtained through low-temperature concentration, recovers low-boiling components such as S-emitted 7-levers and aromas, and saves energy. The purpose is to provide evaporation/distillation equipment.

The present invention is a pressurized type % type % type (% type) using a refrigeration cycle.
2) By combining an evaporator and a distillation column for recovering low-boiling components, it is possible to effectively perform concentration, distillation, and condensation of low-boiling components at low temperatures, and also to save energy.

That is, the present invention comprises a concentrating can for a liquid to be concentrated and an evaporator for a working fluid, and the working fluid is evacuated between the heating side of the concentrating can and the evaporating side of the evaporator via a compressor. A working fluid cycle is formed in which the phase and liquid phase are repeatedly circulated to perform indirect pressurized evaporation, and the vapor generated from the liquid to be concentrated on the evaporation side of the concentrator is guided to the distillation column. This evaporation*distillation apparatus is characterized in that the low-boiling point components obtained in step 1 are guided to the heating side of the evaporator, condensed, and recovered.

Embodiments of the present invention will be described using the drawings.

In the figure, first, the working fluid system will be explained. The working fluid evaporated on the evaporation side of the evaporator 3.

The produced fluid is led to the compressor 4 through the steam piping, where it is adiabatically compressed to increase its enthalpy and saturation pressure. Here, the produced fluid vapor gives ζ heat to the concentrated liquid, which itself condenses to become a saturated liquid and is discharged from the outlet pipe, passes through the expansion valve 1 and the pipe 11v, and evaporates (Mg).
Returns to the source side and forms a refrigeration cycle.

A low boiling point refrigerant such as Freon or ammonia is used as the working fluid, and on the heating side of the compression can, the saturation temperature is 40 to 6
5°C, and the temperature on the evaporation side of IIs from S is 0 to 20°C.

Next, talking about the negative process system, the liquid to be concentrated is supplied from the liquid inlet 13 of the isomote can l, and heat is supplied from the heating side of the isomote can l, a part of which evaporates and is condensed. The liquid is discharged from the liquid outlet 1s.

The evaporation temperature here is 30 degrees centigrade, which does not affect the quality of the liquid to be concentrated, so that a high quality product concentrate can be obtained. - The reduced condensate is pumped out of the system using a pump, etc. - During evaporation, the steam containing low-boiling components that volatilized together is transferred to pipe 1.
After passing 4v, it is supplied from the distillation column 30F side. Steam containing low boiling point components passes through each distillation stage upward from F in the distillation column 3 and is concentrated in one distillation, while water vapor, which is a high boiling point component, is condensed and moved to the distillation stage on the F side.6- Distillation Column The condensed water remains at the bottom of the tube 3, and is discharged from the lowest end through the outlet pipe 1b to the outside of the system by the condensed water pump i.

On the other hand, the low-boiling components to be recovered move to the upper distillation stage, and steam containing a large amount of low-boiling components is supplied to the heating side of the evaporator 3 through one pipe. Here, the steam imparts heat to the working fluid to become a condensate, which is extracted from the heating side F end of the evaporator 3 through an outlet pipe 18 by a pump.

This condensate containing a large amount of low-boiling components is recovered in one recovery device, or all or part of it is supplied to the upper stage of the distillation column 2 via a pipe with a volume of 0.0 to reflux.

Distillation efficiency can be further improved.

In the evaporator 3, the evaporation temperature of the working fluid on the evaporation side is 0.
The temperature is around 20 degrees Celsius, which is sufficiently low.

There is no need to prepare a special low-temperature source (low-temperature water) in order to condense all the steam on the heating side, and the heat transfer area of the evaporator 3 can be kept as much as necessary for cooling the extracted gas.
Condensation and recovery of low boiling point components becomes easier and more reliable.

This embodiment is constructed and operates as described above.

The following effects can be achieved.

(1) Low-temperature concentration is possible and high quality product #brain fluid can be obtained.

(2) Energy can be saved because the refrigeration cycle is used repeatedly without emitting heat outside the system.

(3) At the same time, low-boiling components in steam can be efficiently recovered at low temperatures. It is particularly suitable for recovering aromatic volatile components such as 7 raper and aroma.

(4) Since the heat recovery cycle and the 111 condensation and low boiling point component recovery cycles are completely separated, there is little loss.

(5) Since the vapor containing many low-boiling components discharged from the distillation column can be condensed in the evaporator at a temperature lower than the saturated evaporation temperature, the amount of low-boiling components contained in the bleed air to the vacuum generator can be reduced. , losses can be reduced and low-boiling components can be well recovered.

16) A special low a source for 15) is not required and 1
Because it can be processed in the evaporator of an indirect pressure evaporator,
I want to save energy and save equipment! I4 In the above embodiments, the concentrate can is of a single effect type, but it may be of a multiple effect type.

In that case, conduct the condensed liquid vapor generated in the first concentrator to the distillation column, and guide the vapor containing many low-boiling components that is collected from the upper part of the distillation column to the heating side of the next concentrator. O Space below - 〇 1. The present invention makes it possible to obtain high quality through low-temperature concentration, to easily and accurately recover useful low-boiling components such as evaporated flavors and aro-I, and to save energy. It is possible to provide an evaporation/distillation device, and it is possible to achieve extremely great effects in terms of practical use and energy saving.

[Brief explanation of the drawing]

The drawing is a 70-view of an embodiment of the invention. 1...concentrator, g...distillation column, 3...evaporator. 4... Compressor, G... Condensed water pump,... Bon, P, M... Working fluid steam pipe, 1... Working fluid steam pipe, 1... Outlet pipe, 10... Expansion valve, i
i...Piping, 13...Liquid inlet1. l [...Liquid output 0
．． 14...Piping, l[...outlet pipe, lma...piping, 1@...outlet pipe, 11...recovery device, 16.
··Piping. Patent applicant: Ebara Corporation Ajinomoto Co., Ltd.

Claims (1)

[Claims] 1. A device comprising a concentrator for a liquid to be concentrated and an evaporator for a working fluid;
An operation in which the working fluid is repeatedly circulated through a gas phase and a liquid phase between the heating of the concentrator and the evaporation side of the evaporator via a compressor to perform contact pressure evaporation. A fluid cycle is formed, and the vapor generated from the atomization on the evaporation side of the concentrator is guided to a distillation column, and the low boiling point components obtained in the distillation column are guided to the heating of the evaporator. An evaporation/distillation device characterized by condensation and recovery. 2. The apparatus according to claim 1, wherein part or all of the condensate containing a large amount of low-boiling components condensed in the heating side chamber of the evaporator is supplied to the upper stage of the distillation column and refluxed. .