GB654494A - Process for the preparation of ditolylethane - Google Patents

Process for the preparation of ditolylethane

Info

Publication number
GB654494A
GB654494A GB22464/48A GB2246448A GB654494A GB 654494 A GB654494 A GB 654494A GB 22464/48 A GB22464/48 A GB 22464/48A GB 2246448 A GB2246448 A GB 2246448A GB 654494 A GB654494 A GB 654494A
Authority
GB
United Kingdom
Prior art keywords
per cent
toluene
paraldehyde
parts
mixture
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
GB22464/48A
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.)
Shawinigan Chemicals Ltd
Original Assignee
Shawinigan Chemicals Ltd
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 Shawinigan Chemicals Ltd filed Critical Shawinigan Chemicals Ltd
Publication of GB654494A publication Critical patent/GB654494A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
    • C07C2/86—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon
    • C07C2/862—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon the non-hydrocarbon contains only oxygen as hetero-atoms
    • C07C2/867—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon the non-hydrocarbon contains only oxygen as hetero-atoms the non-hydrocarbon is an aldehyde or a ketone
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • C07C2527/02—Sulfur, selenium or tellurium; Compounds thereof
    • C07C2527/053—Sulfates or other compounds comprising the anion (SnO3n+1)2-
    • C07C2527/054—Sulfuric acid or other acids with the formula H2Sn03n+1

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for preparing 1 : 1-di-p-tolylethane comprises adding paraldehyde to a mixture of toluene and sulphuric acid of about 87 to 95 per cent strength (i.e. comprising by weight acid and water in the ratio between 87 : 13 and 93 : 7 while maintaining the temperature below 10 DEG C. and agitating the resultant mixture, the amount of toluene being more than about 25 per cent in excess of that stoichiometrically required by the paraldehyde, and the amount of sulphuric acid being such that its strength is not reduced below about 87 per cent by the water formed during the reaction. Up to 50 per cent of the total toluene may be employed as diluent for the paraldehyde added to the mixture. The best yields are obtained by conducting the reaction of 0 DEG C., using 90 per cent sulphuric acid, and preferably an excess of 35 to 50 per cent toluene is employed. In an example, 86 parts of toluene and 100 parts of paraldehyde are added to a mixture of 520 parts of toluene and 890 parts of 90 per cent sulphuric acid kept at 0 DEG C. The product is distilled at reduced pressure from the separated hydrocarbon layer. The Specification also mentions fortifying the strength of the acid by adding oleum in the course of the reaction and refers also to the use of monomeric acetaldehyde in place of the paraldehyde, but these alternatives are said to lead to undesirable results.
GB22464/48A 1947-09-08 1948-08-26 Process for the preparation of ditolylethane Expired GB654494A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA654494X 1947-09-08

Publications (1)

Publication Number Publication Date
GB654494A true GB654494A (en) 1951-06-20

Family

ID=4172079

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22464/48A Expired GB654494A (en) 1947-09-08 1948-08-26 Process for the preparation of ditolylethane

Country Status (1)

Country Link
GB (1) GB654494A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002034A (en) * 1958-12-17 1961-09-26 Gulf Research Development Co Process for producing diaryl paraffins
US4612758A (en) * 1982-08-19 1986-09-23 Schumacher Gustav Cutting finger for finger-bar cutters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002034A (en) * 1958-12-17 1961-09-26 Gulf Research Development Co Process for producing diaryl paraffins
US4612758A (en) * 1982-08-19 1986-09-23 Schumacher Gustav Cutting finger for finger-bar cutters

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