Improvements in the Production of Basic Lead Salts for Use as Pigments, and for other Purposes.
Year: 1888

page_text: Improvements in the Production of Basic Lead Salts for Use as
Pigments, and for other Purposes.
I, FARNHAM MAXWELL LYTE of 60, Finborough Road in the County of Middlesex,
Analytical Chemist, do hereby declare the nature of this invention to be as
follows:-
This Invention relates to the production of basic lead carbonate, chloride, phosphate,
or other basic insoluble or sparingly soluble salt of lead by the double decomposition
of basic lead sulphate (for instance, that produced by the process or processes for
which I have obtained Letters Patent dated the 11th day of August 1886,
No. 10298 and September 18th 1886, No. 11,889) with the necessary amount
of a solution of a carbonate, chloride, phosphate, or other soluble salt, the
acid of which is capable of combining with lead and forming an insoluble
or sparingly soluble salt of lead. Heating or boiling as in the production
of the basic sulphate seems to accelerate the operation and render it more complete.
The basic chloride and other insoluble or sparingly soluble basic salts of lead may be
converted in a similar manner. I further find that mixtures of similar salts of
different degrees of basicity and mixtures of different salts (e.g. chloride and
carbonate) whether of the same or different degrees of basicity may be used with
advantage.
D
11
& Wahnua 1988
F. MAXWELL LYTE.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: Improvements in the Production of Basic Lead Salts for Use as
Pigments, and for other Purposes.
I FARNHAM MAXWELL LYTE, of 60 Finborough Road in the County of Middlesex,
Analytical Chemist 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 :-
This Invention relates to the production of basic lead carbonate, basic lead chloride,
basic lead phosphate, or other basic insoluble or sparingly soluble salt of lead by the
double decomposition of basic lead sulphate (for instance that produced by the process
or processes for which 1 have obtained Letters Patent dated the 11th day of August
1886 and numbered 10,298 and the 18th day of September 1886 and numbered 11,889)
or other basic salt of lead as hereafter mentioned with the necessary amount of a 1
soluble carbonate, chloride, or phosphate or other soluble salt the acid of which
is capable of combining with lead (i.e. of displacing the sulphuric acid of
the basic lead sulphate) to form an insoluble or sparingly soluble salt of that
metal.
The reaction is not limited to the treatment of the particular basic lead sulphate 1
produced by the process or processes previously patented by me as other basic lead
sulphates (e.g. the Lewis-Bartlett White Lead) may also be converted in the same
way.
The operation seems to be considerably accelerated by boiling the basic lead
sulphate with the solution of the soluble salt, but it may be performed (although 2
less rapidly and completely) by heating to a less degree or even perhaps in the
cold.
If sodic carbonate be used to convert basic lead sulphate into basic lead carbonate,
it is well to employ 5% (by weight) more of the sodic carbonate than corresponds
to the sulphuric acid contained by the basic sulphate. This amount appears to be 2
sufficient, but I do not confine myself to that quantity.
The basic chloride and the other insoluble or sparingly soluble basic lead salts
or mixtures thereof, may be converted in like manner into another basic salt of
lead.
The process of my invention is limited to the treatment of basic lead salts, and does
not include the conversion of normal salts of lead.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The production of an insoluble or sparingly soluble basic salt of lead by the
double decomposition of basic lead sulphate with a soluble carbonate, phosphate, or

page_text: other salt whose acid is capable of displacing the sulphuric acid of the basic lead
sulphate to form an insoluble or sparingly soluble salt of lead, as specified.
2. The conversion of basic lead chloride or other insoluble or sparingly soluble,
salt of lead into another basic salt of lead by the double decomposition of the salt or
mixture of salts to be converted with a soluble salt, whose acid is capable of combining
with lead, as specified.
D11 1: 011 1
AT
1000
F. MAXWELL LYTE.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.