Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy... – Treating gas – emulsion – or foam
Patent
1993-03-29
1996-01-09
Beisner, William H.
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
Treating gas, emulsion, or foam
4352941, 4352971, 95129, 96 5, 96 8, 2611221, 423235, 422168, C12S 500, C12M 112, C12M 104
Patent
active
054828597
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Frequently, especially for biological processes, gaseous substances have to be fed into liquid media. During such process the substance to be converted is at equilibrium between the two phases, which depends on the concentration of the respective substance in the gaseous phase. In many cases the concentrations of the gaseous substances are, however, that low that a sufficient conversion into the liquid phase is not or only insufficiently possible. This applies mostly to those cases where the solubility of the gas cannot be improved by increasing the pressure.
SUMMARY OF THE INVENTION
The conversion of gaseous substances into liquid media is especially important for biological systems. When supplying microorganisms such as bacteria or eucaryotic cells with gaseous substances, the substances have to be dissolved first in the watery medium containing the microorganisms. Only from this stage the substances can reach the microorganisms directly. Such systems, however, represent another difficulty; together with the gaseous substances unwanted foreign germs and toxic compounds are often transferred.
Object of the present invention is to provide a device for feeding gaseous substances into liquid media eliminating the disadvantages described above.
According to the invention the problem is solved by the arrangement of a number of hollow membrane bodies which are permeable to gas and contain the liquid media. These membranes are arranged with a distance between them in such a way that the gaseous substances can reach them.
BRIEF DESCRIPTION OF THE DRAWINGS
Further embodiments of the invention are described by the subclaims and are detailed below using the preferred embodiments shown in the drawings. It shows:
FIG. 1a Schematic side view of the device according to the invention
FIG. 1b Schematic cross-section of the device taken along 1b--1b of FIG. 1a
FIG. 2a Perspective side view of the arrangement of the individual hollow membrane bodies
FIG. 2b Detail A, enlarged
FIG. 3a Schematic side view of a hollow membrane body
FIG. 3b Schematic longitudinal section of a hollow membrane body taken along lines 3b--3b of FIG. 3a
FIG. 3c Schematic cross-section of a hollow membrane body taken along lines 3c--3c of FIG. 3a
FIGS. 4a and 4b Schematic longitudinal section of a hollow membrane body
FIG. 4c Schematic cross-section of a hollow membrane body
FIG. 4d Detail B of a hollow membrane body
FIG. 4e Detail C of a hollow membrane body
FIG. 5 Cross-section of the arrangement of individual devices combined with each other
DETAILED DESCRIPTION OF THE INVENTION
The device shown in FIG. 1 for carrying out the process according to the invention shows a preferred embodiment with the appearance of a reactor with a closed housing 2, where a number of hollow membrane bodies 1 is arranged with a distance between them. These hollow membrane bodies 1 form a membrane module, which is connected either fixed or detachable to housing 2. The individual hollow membrane bodies 1 are filled with a watery medium and a gaseous substance is streaming towards them. Preferably the medium flows parallel to the outer surfaces of the hollow membrane bodies so as to diffuse the gases as well as possible over the entire membrane surface. At the lower end 13 of housing 2 a bottom 20 with gas inlet openings 15 may be arranged. The medium streams via these gas inlet openings 15 to the hollow membrane bodies 1. To obtain a flow resistance as low as possible, bottom 20 can be omitted. Depending on the application the device may be directly installed in an existing gas stream. On the other hand, the medium to be cleaned may be transferred via transfer lines 21 to be fed into the device. After the gaseous medium has passed the hollow membrane bodies 1, the medium escapes at the top end 14 of housing 2. For this, cover 22 is provided with outlet openings. Alternatively, a central gas outlet 16 may be arranged.
Depending on the condition of the media to be converted it is advisable to provide an air conditioned environment for
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Biller Edmund
Bock Eberhard
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