IMPROVEMENTS IN THE MANUFACTure of MAGNESIUM CHLORIDE
Year: 1885

page_text: We EDMUND KNOWLES MUSPRATT of Seaforth Hall near Liverpool in the
County of Lancaster Manufacturing Chemist and GEORGE ESCHELLMANN Ph.D. of
Widnes in the County of Lancaster for "IMPROVEMENTS IN THE MANUFACTure of
MAGNESIUM CHLORIDE" to be as follows:-
=
In Specification of Letters Patent N° 5168 of 1883 granted to us we describe
a treatment of the Mother liquor resulting from crystallization of the Chlorate of
Potassium with Hydrochloric Acid and Steam to decompose the small quantity of
Chlorate into chlorine and Potassium Chloride, and after being neutralized by.
Magnesia it is boiled down in iron pans to solidify the magnesium chloride and
render it available for sale This magnesium chloride in boiling is found to dissolve
a small quantity of iron from the pan which colours the magnesium chloride red,
by formation of Iron Oxide.
This is owing to the presence of magnesium Chlorate or Hypochlorite either of
which is formed by the small quantity of Chlorine left in solution after the
treatment with Hydrochloric acid and Steam and the subsequent neutralization.
of Magnesia.
Our present Invention has for its object to obviate this objectionable colouring
of the magnesium chloride by removing the cause of such colouring This may be
effected by adding to the liquor a sufficient quantity of Caustic Magnesia, Caustic
Lime, or Caustic Soda, either of which prevents the magnesium chlorate or Hypo-
chlorite from acting on the iron of the pan or by adding to the liquor to decompose
the magnesium Chlorate or Hypochlorite an equivalent quantity of Sulphurous
acid arsenious acid, Hyposulphite or any other suitable reducing or deoxidizing
Agent or the desired result may be attained by adding to the liquor before
neutralizing a certain quantity of either Potassium or Sodium Chloride thus
converting the magnesium Chlorate or Hypochlorite into Potassium or Sodium
Chlorate or Hypochlorite neither of which will act upon the iron of the boiling
pans in small quantities, as does magnesium chlorate or Hypochlorite.
Dated the 11th day of February 1885,
J. HENRY JOHNSON,
Agent for the said Edmund Knowles Muspratt
and Geo. Eschellmann.

page_text: Improvements in the Manufacture of Magnesium Chloride.
We, EDMUND KNOWLES MUSPRATT, of Seaforth Hall near Liverpool in. the
County of Lancaster, Manufacturing Chemist, and GEORGE ESCHELLMANN Ph.D.
of Widnes in the County of Lancaster do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
- described and ascertained in and by the following statement:-
--
In the Specification of Letters Patent No 5168 of 1883 granted to us, we describe
a treatment of the mother liquor resulting from the Crystallization of the Chlorate
of Potassium with Hydrochloric Acid and Steam to decompose the small quantity
of Chlorate into Chorine and Potassium Chloride, and after being neutralized by
magnesia, it is boiled down in iron pans to solidify the magnesium chloride and
render it available for sale. This magnesium Chloride in boiling is found to
dissolve a small quantity of Iron from the pan, which colours the magnesium
chloride red, by formation of Iron oxide.
This is owing to the presence of magnesium chlorate or Hypochlorite either of
which is formed by the small quantity of chlorine left in solution after the
treatment with Hydrochloric acid and steam and the subsequent neutralization by
magnesia.
Our present Invention has for its object to obviate this objectionable colouring
of the magnesium chloride by removing the cause of such colouring. This may be
effected by adding to the liquor, during the process of neutralization, a sufficient
quantity of caustic magnesia, caustic lime or caustic soda (we find 11 lbs of caustic
magnesia to every 100 gallons of liquor to give good results) either of which
prevents the magnesium, chlorate, or Hypochlorite froni acting on the iron of the
pan, or by adding to the liquor to decompose the magnesium chlorate or Hypo-
chlorite, an equivalent quantity of Sulphurous acid, arsenious acid, Hyposulphite
or any other suitable reducing or deoxidizing agent, (we find 2 quarts of sulphurous
acid to every 100 gallons of liquor to give good results) or the desired result may
be attained by adding to the liquor before neutralizing, a certain quantity of either
potassium or sodium chloride (we find 11 lbs potassium or sodium chloride to every
100 gallons of the liquor to be sufficient) thus converting the magnesium chlorate
or Hypochlorite into potassium or Sodium Chlorate or Hypochlorite, neither of
which will act in small quantities upon the iron of the boiling pans, as does
magnesium chlorate or Hypochlorite. It is preferred to use cast iron vessels for
the purpose of concentrating the liquor after treatment, to prevent any slight
traces of iron from colouring the solid magnesium chloride.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
In the manufacture of magnesium Chloride the employment of means to prevent
objectionable colouring of the product substantially as hereinbefore described.
Did thin 11th day of November 190K