US1462840A - Method of determining free-phosphoric-acid content - Google Patents

Method of determining free-phosphoric-acid content Download PDF

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Publication number
US1462840A
US1462840A US553739A US55373922A US1462840A US 1462840 A US1462840 A US 1462840A US 553739 A US553739 A US 553739A US 55373922 A US55373922 A US 55373922A US 1462840 A US1462840 A US 1462840A
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Prior art keywords
acid
phosphoric
acid content
determining
determining free
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US553739A
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James F Wilkinson
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/15—Inorganic acid or base [e.g., hcl, sulfuric acid, etc. ]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/16—Phosphorus containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
    • Y10T436/25375—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
    • Y10T436/255—Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.] including use of a solid sorbent, semipermeable membrane, or liquid extraction

Definitions

  • This invention relates to methods of determining the free phosphoric acid content of acid phosphate, and more particularly to a method. of direct determination in-which precipitation of the free acid is unnecessary.
  • the free phosphoric acid is extracted from the acid phosphate by means of an alcoholic solution and is then titrated with an alkalim'etal hydroxide such as caustic soda or caustic potash.
  • an alkalim'etal hydroxide such as caustic soda or caustic potash.
  • phenolphthalein is used as an indicator.
  • a hydroxide of known strength is used in order to obtain the percentage of phosphoric acid present in the acid phosphate as free phosphoric acid.
  • a gram of the fresh made acid phosphate is placed in a metallic flask with one hundred cubic centimeters of 95 per cent alcohol.
  • 'Steel-balls of about live eighths of an inch diameter are used in the flask to aid in the digestion.
  • the flask is closed with a rubber stopper and the contents are given a whirling motion for about five minutes.
  • the solution then filtered and twentycubic centimeters titrated with caustic soda The number of cubic centimeters is divided by two in order to reduce the determination to a. one tenth gram basis.
  • caustic soda or caustic potash of 3.11 normal strength is employed.
  • the strength of the solution may be 3.11 normal strength.
  • Phenolphthalein is used as indicator.
  • the free phosphoric acid content of acid phosphate may be readily and quickly determined.
  • the process of determining the free phosphoric acid content of acid phosphate which comprises extracting the acid from a known amount of acid phosphate with a known quantity of alcohol, and tili'ating the solution obtained with caustic soda.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Description

' or caustic potash.
Patented July 24, 192
"1? A A T E FlCE- No Drawing.
To all whom it may concern:
Be it known that 1, JAMES F. IVrLKINsoN, a citizen of the United States, residing at Savannah; in the county of Chatham and State of Georgia, have invented certain new and useful Improvements in Methods of Determining Free-Phosphoric-Acid Content, of which the following is a specification.
This invention relates to methods of determining the free phosphoric acid content of acid phosphate, and more particularly to a method. of direct determination in-which precipitation of the free acid is unnecessary.
The free phosphoric acid is extracted from the acid phosphate by means of an alcoholic solution and is then titrated with an alkalim'etal hydroxide such as caustic soda or caustic potash. In determining the acidity phenolphthalein is used as an indicator.
In titrating the acid a hydroxide of known strength is used in order to obtain the percentage of phosphoric acid present in the acid phosphate as free phosphoric acid.
In practice of the process, a gram of the fresh made acid phosphate is placed in a metallic flask with one hundred cubic centimeters of 95 per cent alcohol. 'Steel-balls of about live eighths of an inch diameter are used in the flask to aid in the digestion. The flask is closed with a rubber stopper and the contents are given a whirling motion for about five minutes.
The solution then filtered and twentycubic centimeters titrated with caustic soda The number of cubic centimeters is divided by two in order to reduce the determination to a. one tenth gram basis.
In the titration caustic soda or caustic potash, of 3.11 normal strength is employed. The strength of the solution, however, may
be varied, but in varying the strength the" number of cubic centimeters of the alkali hydroxid is varied accordingto the strength;
if the strength of the solutionisdoubled the METHOD or DETERMINING nnnE-rHosrHoRIc-Acm CONTENT.
A ncauommea April 17, 1922. s an No. 553,739.
number of cubic centimeters used is doubled to obtain the proper percentage of tree phosphoric acid. Phenolphthalein is used as indicator.
By means of the present process the free phosphoric acid content of acid phosphate may be readily and quickly determined.
In the manufacture of acid phosphate thereis always a certain amountof tree phosphoric acid present depending upon the amount of sulphuric acid used in the manufacture. The present process may be used as a guide to proper acidulation in the process of manufacturing acid phosphate.
IVhile I have described, in detail, the preferred practice of my process, it is to be understood that the details of the procedure, and the proportions of ingredients may be widely varied, and that known chemical equivalents may be used in place of the ma terials mentioned, without departing from the spirit of the invention or, the scope of the subjoined claims.
, Having described any invention, I claim l. The process of determining the frephosphoric acid content of acid phosphate which comprises extracting the acid from a known amount of acid phosphate with a known quantity of alcohol, and titrat-ing the solution obtained with an alkali-metal hydroxid.
The process of determining the free phosphoric acid content of acid phosphate which comprises extracting the acid from a known amount of acid phosphate with a known quantity of alcohol, and tili'ating the solution obtained with caustic soda.
In testimonywhereot' I afiix my signature in presence of two Witnesses.
JAMES F. WILKINSON.
Witnesses:
W. W. CONNELL, J. C. PETERS.
US553739A 1922-04-17 1922-04-17 Method of determining free-phosphoric-acid content Expired - Lifetime US1462840A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937930A (en) * 1956-01-25 1960-05-24 Geld Isidore Compositional control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937930A (en) * 1956-01-25 1960-05-24 Geld Isidore Compositional control method

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