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New method for the exact determination of phenols in low-temperature tar and tar oils

Journal Article:

Abstract

A 3-gram sample of water-free tar or tar oil containing approximately 50% phenols is dissolved in a mixture of benzene and xylene and a known excess of a 20% KOH solution of known normality saturated with benzene and xylene is added. Weight of the KOH is determined by difference. This mixture is shaken repeatedly in a 300-milliliter separatory funnel. After standing for 0.5 h, the dark or almost black phenolate solution containing the major portion is separated and weighed. Care must be taken to prevent the induction of solids. The phenolate in the residue is extracted with hot water and titrated with 0.2N HCl and 1 ml. Congo red (1:100). If water is present in the tar or tar oil, 100 ml of xylene is added immediately after weighing and the water separated by distillation the weight of which must be determined. Any phenols carried over are dissolved in the small quantity of xylene in the distillate. This quantity is added to the bulk of the xylene. After any remaining phenols are extracted from the tar residue with boiling benzene, the benzene-xylene mixture is treated with KOH as above. The accuracy of the method is estimated to be +-1% as  More>>
Publication Date:
Jan 01, 1949
Product Type:
Journal Article
Reference Number:
EDB-80-032330
Resource Relation:
Journal Name: Erdoel Kohle; (Germany, Federal Republic of); Journal Volume: 2
Subject:
01 COAL, LIGNITE, AND PEAT; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COAL TAR; CHEMICAL ANALYSIS; COAL TAR OILS; PHENOLS; QUANTITATIVE CHEMICAL ANALYSIS; AROMATICS; HYDROXY COMPOUNDS; OILS; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; TAR; 010600* - Coal, Lignite, & Peat- Properties & Composition; 400102 - Chemical & Spectral Procedures
OSTI ID:
5751377
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: ERKOA
Submitting Site:
TIC
Size:
Pages: 238-240
Announcement Date:

Journal Article:

Citation Formats

Lambris, G, and Haferkorn, H. New method for the exact determination of phenols in low-temperature tar and tar oils. Germany: N. p., 1949. Web.
Lambris, G, & Haferkorn, H. New method for the exact determination of phenols in low-temperature tar and tar oils. Germany.
Lambris, G, and Haferkorn, H. 1949. "New method for the exact determination of phenols in low-temperature tar and tar oils." Germany.
@misc{etde_5751377,
title = {New method for the exact determination of phenols in low-temperature tar and tar oils}
author = {Lambris, G, and Haferkorn, H}
abstractNote = {A 3-gram sample of water-free tar or tar oil containing approximately 50% phenols is dissolved in a mixture of benzene and xylene and a known excess of a 20% KOH solution of known normality saturated with benzene and xylene is added. Weight of the KOH is determined by difference. This mixture is shaken repeatedly in a 300-milliliter separatory funnel. After standing for 0.5 h, the dark or almost black phenolate solution containing the major portion is separated and weighed. Care must be taken to prevent the induction of solids. The phenolate in the residue is extracted with hot water and titrated with 0.2N HCl and 1 ml. Congo red (1:100). If water is present in the tar or tar oil, 100 ml of xylene is added immediately after weighing and the water separated by distillation the weight of which must be determined. Any phenols carried over are dissolved in the small quantity of xylene in the distillate. This quantity is added to the bulk of the xylene. After any remaining phenols are extracted from the tar residue with boiling benzene, the benzene-xylene mixture is treated with KOH as above. The accuracy of the method is estimated to be +-1% as shown by experiments with phenol; o-, m-, and p-cresol; cresol mixture; and pyrocatechol. The weight of the dissolved phenols X is determined by X = c - a + cd/(ab - d) where a = weight of KOH, b = HCl used per gram of KOH, C = weight of major portion of phenolate solution, which is formed by shaking the phenol solution with KOH, d = HCl used for titration of phenolate residue.}
journal = {Erdoel Kohle; (Germany, Federal Republic of)}
volume = {2}
journal type = {AC}
place = {Germany}
year = {1949}
month = {Jan}
}