JPH0611076Y2 - Pervaporation separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pervaporative separation device. For more details,
The present invention relates to a pervaporative separation device in which modules connected in series or in parallel are housed in a container, and a permeate fluid chamber is connected by a ventilation pipe.

[Prior Art] A mixed liquid is supplied to the primary side (supply side) across a separation membrane and the secondary side (permeation side) is depressurized, or a carrier gas is caused to flow to separate the substances to be separated in a gaseous state. The so-called pervaporation separation method for permeation has been studied since about 1950.
The pervaporative separation method is considered to be suitable for separating an azeotropic mixture or a mixture having a small boiling point difference, which is difficult or difficult to be separated by ordinary distillation, but there are still few examples that have been industrialized in earnest. This is mainly due to the fact that the permeability of the membrane, that is, the separation coefficient and the permeation rate of the components to be separated is not large, and various studies have been made to improve the permeability of these membranes (for example, JP-A-62-62). -186907, 62-210008
No. 62-250906, 63-7803, 63-12304, 63-28409
No. 63-44904, etc.).

[Problems to be Solved by the Invention] In order to industrially utilize the pervaporation separation method, it is not enough to simply study the improvement of the membrane itself. That is, even if permeation vaporization separation is performed using a separation membrane having excellent permeability, permeation vaporization separation cannot be industrially advantageously performed unless the apparatus can be upsized.

In a module in which a bundle of hollow fibers is mounted in a housing, when pervaporative separation is performed by reducing the inner surface side of the hollow fibers, especially when a fine hollow fiber membrane is used as a separation membrane, the inner surface of the hollow fiber There is a tendency that the pressure loss at 2 becomes large and the desired depressurized state cannot be maintained, so that pervaporation separation cannot be carried out efficiently. This tendency becomes more remarkable as the hollow fiber length is made longer, and becomes an important problem when pervaporation separation is industrially carried out on a large scale.

Conventionally, there have been almost no examples in which the pervaporation separation apparatus has been studied from such a viewpoint, and therefore the object of the present invention is to provide an industrially advantageous pervaporation separation with good separation efficiency without the above problems. To provide a device.

[Means for Solving the Problems] The inventors of the present invention have earnestly studied to obtain an efficient pervaporative separation device as described above, and have arrived at the present invention. That is, according to the present invention, a plurality of modules in which hollow fiber bundles are attached to a tubular casing are stored in a container having a liquid inlet for treatment, a liquid inlet for heating or cooling, and a permeate outlet.
It is a pervaporative separation device characterized in that the permeate fluid chamber is connected by a ventilation pipe.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view of an example of the pervaporative separation device of the present invention. 1 is an inlet for a liquid to be treated, 2 and / or 3 is an outlet for a membrane-permeating fluid, 4 is an outlet for a membrane-impermeable fluid, 5 and 6 are inlets or outlets for a fluid for heating or cooling, 7 is a bundle of hollow fibers, 8 is a fixing A flange, 9 is a bundle sheet, 10 is a supporting member at the end of the hollow fiber element, 11 is a baffle plate, and 12 is a ventilation pipe. 2 and / or 3 are usually connected to a vacuum line through a cooler.

The hollow fibers constituting the hollow fiber bundle contained in the liquid mixture separating module of the present invention are commonly used as, for example, cellulose-based, cellulose acetate-based, polyvinyl alcohol-based, polyacrylonitrile-based, polysulfone-based,
A hollow fiber made of a material such as polypropylene is used. The open end of the hollow fiber bundle is supported by a supporting member made of a potting material such as epoxy resin, unsaturated epoxy resin, urethane resin, or silicone resin, and housed in a casing.

To fix the hollow fiber bundle to the casing, form the hollow fiber bundle with such potting material and, for example, as shown in the drawing, fix it to the bundle sheet with a fastener such as a bolt or nut. Good. The open end of the hollow fiber bundle may be open at one end or open at both ends.

In this way, the modules each composed of the hollow fiber bundle are connected in series or in parallel by the connecting pipe 17 and housed in a container.

In the present invention, the permeate fluid chamber is connected by a ventilation pipe. The size of the ventilation pipe is not particularly limited, but is usually about 1/10 to 1/2 of the diameter of the container, which is practical and preferable.
Further, the length is preferably such that the permeate fluid chamber is communicated, and usually the length is about the same as the module. Since the device according to the present invention has such a ventilation pipe, the pressure loss in the hollow fiber of each module is small when the permeated fluid side is depressurized, and the desired depressurized state can be maintained extremely efficiently. . Therefore, the device of the present invention can be easily multi-staged and can be utilized as a pervaporative separation device of various scales as required. FIG. 2 is a schematic diagram showing an example of such a multi-stage apparatus.

A heating medium such as steam, hot water, or oil is usually used for heating the liquid to be treated, and the temperature inside the module can be prevented from being lowered by applying heat to the liquid to be treated from the heating medium. It is free to flow a cooling fluid such as hot water or cold water to 5 or 6 to control the separation. The materials of the modules, the pipes connecting the modules, the ventilation pipes, and the container for storing them are not particularly limited, and materials that are not attacked by the liquid to be treated may be appropriately selected and used.

The liquid to be processed is often an organic liquid aqueous solution, but an organic-organic liquid mixture or a liquid mixture in which a plurality of these are mixed is also processed. Further, not only the liquid but also the vapor may be processed.

In the liquid mixture separating module of the present invention, it is preferable to put a baffle inside or to improve the fluid flow by various means to improve the separation efficiency, as shown at 11 in FIG. .

To carry out the separation of a liquid mixture using the device of the invention,
It may be carried out by circulating the heating fluid from 5 or 6 in advance to set it to a desired temperature, supplying the liquid to be treated, and controlling the permeate side to a prescribed pressure with a vacuum pump or the like.

[Advantage of the Invention] According to the present invention, it is possible to provide a pervaporative separation device in which a permeate fluid chamber is connected by a ventilation pipe. Since such a pervaporative separation device can reduce the pressure from both ends of the module, the pressure on the permeate side can be easily maintained at a desired reduced pressure state, and thus the device of the present invention can be easily multi-staged. And is useful as a device for industrially performing pervaporative separation.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of the pervaporation separation apparatus of the present invention, and FIG. 2 is a schematic view showing an example in which such a state is multistaged. FIG. 3 is a schematic view showing a cross section of the inside of the apparatus shown in FIG. 1 ... Liquid inlet for treatment 2, 3 ... Membrane permeating fluid outlet 4 ... Membrane non-permeating fluid outlet 5 ... Heating or cooling fluid inlet / outlet port 6 ... Heating or cooling fluid outlet / inlet port 7 ... Hollow fiber element 8 ... Fixing flange 9 ... Bundle sheet 10 ... Support member 11 ... Baffle plate 12 ... Vent pipe 13, 14 ... Permeate fluid chamber 15 ... Container 16 ... O-ring 17 ...... Connection pipe

Claims (1)

[Scope of utility model registration request] 1. A container provided with an inlet for introducing a liquid to be treated, an inlet for introducing a fluid for heating or cooling, and an outlet for a permeated fluid contains a plurality of modules in which hollow fibers are mounted in a cylindrical casing, and the permeated fluid is contained in the container. A pervaporative separation device characterized in that the chambers are connected by a ventilation pipe.