GB588717A - Improvements in or relating to the preparation of lead salts of phthalic acid - Google Patents

Improvements in or relating to the preparation of lead salts of phthalic acid

Info

Publication number
GB588717A
GB588717A GB17302/44A GB1730244A GB588717A GB 588717 A GB588717 A GB 588717A GB 17302/44 A GB17302/44 A GB 17302/44A GB 1730244 A GB1730244 A GB 1730244A GB 588717 A GB588717 A GB 588717A
Authority
GB
United Kingdom
Prior art keywords
lead
phthalic acid
coo
relating
preparation
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
Application number
GB17302/44A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NAT LEAD CO
NL Industries Inc
Original Assignee
NAT LEAD CO
NL Industries Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NAT LEAD CO, NL Industries Inc filed Critical NAT LEAD CO
Publication of GB588717A publication Critical patent/GB588717A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/41—Preparation of salts of carboxylic acids
    • C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part

Abstract

Lead phthalates are made by reacting phthalic acid or anhydride with lead monoxide in the presence of water. A solution of phthalic acid or anhydride may be added to a hot suspension of lead monoxide in water at a rate slightly slower than the reaction rate. A temperature range of between 15 DEG and 100 DEG C. and preferably 75 DEG to 95 DEG C. is used. When the pH of the reaction mixture drops from 9.2 to 8.5, dibasic lead phthalate hemihydrate, 2PbOC6H4(COO)2Pb 1/2 H2O, is separable; a further drop to 6.5 indicates the formation of monobasic lead phthalate, PbOC6H4 (COO)2Pb and a further drop to 5.1 indicates normal lead phthalate, C6H4(COO)2Pb. The basic phthalates are suitable for use as pigments. A catalyst such as nitric or formic acid may be used if desired in amounts between 0.10 and 0.15 pounds per 100 pounds of lead monoxide.
GB17302/44A 1943-09-11 1944-09-11 Improvements in or relating to the preparation of lead salts of phthalic acid Expired GB588717A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US588717XA 1943-09-11 1943-09-11

Publications (1)

Publication Number Publication Date
GB588717A true GB588717A (en) 1947-06-02

Family

ID=22019422

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17302/44A Expired GB588717A (en) 1943-09-11 1944-09-11 Improvements in or relating to the preparation of lead salts of phthalic acid

Country Status (1)

Country Link
GB (1) GB588717A (en)

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