An Improved Process for Pasteurising and Sterilising Milk and other Liquids.
Year: 1899

page_text: Date of Application, 21st Dec., 1899
Complete Specification Left, 18th Sept., 1900-Accepted, 24th Nov., 1900
PROVISIONAL SPECIFICATION.
An Improved Process for Pasteurising and Sterilising Milk and other
Liquids.
I, EMIL VON BÜHLER, of Westend-Charlottenburg, Germany, Merchant, do
hereby declare the nature of this invention to be as follows:-
This invention consists in heating the liquid as milk for instance, in two
batteries, one of the batteries serving to heat, for instance by means of steam,
the milk which has been preliminarily heated by means of the milk heated
in the other battery. Each battery is composed of two or more pasteurising or
sterilising apparatus connected with each other.
By distributing the milk and the two heating mediums (steam and
heated milk) into a number of apparatus, the milk gets gradually heated and
the two heating mediums are gradually cooled off, so that great differences in
the temperature between the milk and the heating walls, touched by the milk,
cannot take place, and that the milk cannot adhere to the heating walls, or get
burned. The danger of an insufficient pasteurisation or sterilisation of certain
parts of the milk is obviated, since, though it may happen that single parts of
the milk are discharged from one apparatus into the other with too great a speed,
it is improbable that this will also be the case in the second or third apparatus.
A further advantage of this process consists in the easy manufacture and the
convenient mounting of the apparatus. Instead of building apparatus of different
sizes, only small standard types are made, of which so many are connected with
each other that their total output corresponds with the required output. The
packing, transport and mounting of the small apparatus requires less trouble
than large ones; besides the small apparatus being more handy for cleaning,
which is of great advantage especially in dairies.
1800
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C.,
Agent for the Applicant.
An Improved Process for Pasteurising
Liquids.
I, EMIL VON BÜHLER, of Westend-Charlottenburg, Germany, Merchant, do
hereby declare the nature of this invention, and in what manner the same is
077

page_text: to be performed to be particularly described and ascertained in and by the
following statement:-
The process of heating milk, by means of a single apparatus, for the purpose
of pasteurising and sterilising, has the following defects:-The steam which is
almost exclusively used as a heating medium, introduced into the heating space,
under pressure, gives the heating walls an almost uniform temperature, so that
the cold milk, entering the apparatus, is suddenly brought into contact with the
highly heated walls, and experience has shown that in spite of the stirring device
this will cause the milk either to adhere to the heating walls, or even to burn.
Another disadvantage is that the pressure, with which the milk is forced into the
apparatus, produces a current, which, by action of the stirring device, will cause
certain parts of the milk to pass the apparatus so quickly as to prevent it from
being sufficiently pasteurised or sterilised. By employing regenerators by means
of which the inducted milk is being previously heated by the heated milk that
flows off, the disadvantage that the milk adheres to the heating walls or that
it gets burned, is somewhat diminished, but no means are provided for removing
the danger of an imperfect pasteurisation or sterilisation.
By the present invention, these two drawbacks are entirely obviated. The
invention consists in heating the milk in two batteries joined to each other, each
battery formed of two or several apparatus, connected with one another, one of
the batteries serving to complete the heating of the previously heated milk by
an independent heating medium, and the other to previously heat the cold milk
by means of the milk heated in the first battery.
In the accompanying drawing are shown, as an example, two batteries, each
consisting of three apparatus connected with each other. In the battery A,
consisting of the regenerators 1, 2, 3, the cold milk is previously heated by means
of the milk already heated, whilst in the battery B, consisting of the appa-
ratus I, II, III, the milk which is previously heated in the battery A is heated
by means of any independent heating medium. The inner circles represent the
heated space, and the outer ring-shaped spaces the heating space of the single
apparatus. Both the previous heating and the subsequent heating are effected
according to the counter current principle.
By distributing the milk and the two heating mediums (steam, for instance, and
heated milk) into a number of apparatus, the milk gets gradually heated and
the two heating mediums are gradually cooled off, so that great differences in
the temperature between the milk and the heating walls, touched by the milk,
cannot take place, and that the milk cannot adhere to the heating walls, or get
burned. The danger of an insufficient pasteurisation or sterilisation of certain
parts of the milk is obviated, since, though it may happen that single parts, of
the milk are discharged from one apparatus into the other too quickly, it is
improbable that this will also be the case in the second or third apparatus.
A further advantage of my invention consists in the easy manufacture and the
convenient mounting of the apparatus. Instead of building apparatus of different
sizes, only small standard types need be made, of which so many are connected
with each other that their total output corresponds with the required output.
The packing; transport and mounting of the small apparatus requires less trouble
than large ones: besides the small apparatus being more handy for cleaning,
which is of great advantage especially in dairies.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
The process for pasteurising or sterilising milk and other liquids, consisting
in gradually heating the liquid in two batteries joined to each other, according
to the counter current principle, each battery being composed of two or several
pasteurising or sterilising apparatus, connected one to another, one of the two

page_text: batteries serving for heating the previously heated liquid by means of an inde-
pendent heating medium and the other battery serving to preliminarily heat the
liquid by means of the liquid heated in the first named battery, as and for the
purpose specified.
Dated this 18th day of September 1900.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C.,
Agent for the Applicant.