US525826A - Process of making white lead - Google Patents
Process of making white lead Download PDFInfo
- Publication number
- US525826A US525826A US525826DA US525826A US 525826 A US525826 A US 525826A US 525826D A US525826D A US 525826DA US 525826 A US525826 A US 525826A
- Authority
- US
- United States
- Prior art keywords
- lead
- solution
- white lead
- carbon dioxide
- making white
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000004 White lead Inorganic materials 0.000 title description 11
- 238000000034 method Methods 0.000 title description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 10
- 229940046892 lead acetate Drugs 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/14—Compounds of lead
- C09C1/16—White lead
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G21/00—Compounds of lead
- C01G21/14—Carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
Definitions
- This invention relates to precipitation processes of making white lead for use as a pigment, and particularly to that method wherein a solution of basic lead acetate is treated with carbon dioxide which latter precipitates a portion of the lead in the form of hydrocarbonate,
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
NITED STATES ELWVYN WALLER AND CHARLES A. SNIFFIN, OF NEW YORK, N. Y., ASSIGNORS TO THE AMORPHOUS WHITE LEAD COMPANY, OF NEW JERSEY.
PROCESS OF MAKING WHITE LEAD.
SPECIFICATION forming part of Letters Patent No. 525,826, dated September 11, 1894.
To aZZ whom it may concern.-
Be it known that we, ELWYN WALLER and CHARLES A. SNIFFIN, citizens of the United States, and residents of the city, county, and State of New York, have invented an Improved Process of Making White Lead, of which the following is a specification.
This invention relates to precipitation processes of making white lead for use as a pigment, and particularly to that method wherein a solution of basic lead acetate is treated with carbon dioxide which latter precipitates a portion of the lead in the form of hydrocarbonate,
the white lead of commerce.
It is essential to the usefulness of white lead as a pigment that it shall be highly amorphous in character, and this quality has not, so far, been attained in a satisfactory degree by the passing of carbon dioxide, in a gaseous state, into a solution of the basic lead acetate.
We have discovered that when a solution of basic lead and a solution of carbon dioxide in water are mixed together preferably under pressure above the atmosphere, the carbon dioxide taken up by the water acts on the lead in the solution and precipitates it in the form of highly amorphous lead hydrocarbonate.
In carrying out our invention in the preferred way, we prepare a solution of basic lead acetate by any of the methods known in the arts, and a solution of carbon dioxide in water under pressure, and then force one of these solutions into the other, preferably the basic solution into the carbonated water contained in a precipitating vessel. The carbon dioxide held in solution in the water acts on the lead, (or some part thereof) in the solution of basic acetate, and precipitates it in the form of white lead which is removed and dried. The liquid remaining in the vessel contains neutral lead acetate in solution, and this solution may be employed in preparing a fresh charge of the basic acetate in a way well understood in the arts.
We may employ the carbonated water under atmospheric pressure; that is, in an open vessel; but as the volume of carbon dioxide which is taken up and held in solution under the pressure of the atmosphere is only equal, approximately, to that of the water, the percentage of the precipitate proportional to the Volume of water in the residual solution of neutral acetate, is very small, and where this solution is to be employed in preparing a new charge, the necessity of reducing the volume by evaporation renders the process less economical than where the carbonated water is under pressure and contains a much larger Volume of carbon dioxide.
Having thus described our invention, we claim- 1. The herein described method of making white lead, which consists in preparing an aqueous solution of basic lead acetate and a solution of carbon dioxide in water under pressure, and then forcing one of said solutions into the other, whereby lead is precipitated from the lead solution in the form of amorphous hydrocarbonate, and then separating said precipitate from the residual liquid.
2. The herein described method of making white lead, which consists in forcing a solution of basic lead acetate into water charged with carbon dioxide, under pressure, whereby lead from said solution is precipitated in the form of white lead or lead hydrocarbonate.
In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.
ELWYN WALLER. CHAS. A. SNIFFIN.
Witnesses:
SELAH L. BENNETT, SAM. S. CAMPBELL.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US525826A true US525826A (en) | 1894-09-11 |
Family
ID=2594616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US525826D Expired - Lifetime US525826A (en) | Process of making white lead |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US525826A (en) |
-
0
- US US525826D patent/US525826A/en not_active Expired - Lifetime
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