GB232392A - Improvements in the manufacture of hydroxy benzaldehydes - Google Patents

Improvements in the manufacture of hydroxy benzaldehydes

Info

Publication number
GB232392A
GB232392A GB705724A GB705724A GB232392A GB 232392 A GB232392 A GB 232392A GB 705724 A GB705724 A GB 705724A GB 705724 A GB705724 A GB 705724A GB 232392 A GB232392 A GB 232392A
Authority
GB
United Kingdom
Prior art keywords
sulphuric
acid
salicylaldehyde
hydroxybenzaldehyde
distillate
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
GB705724A
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.)
Imperial Chemical Industries Ltd
Original Assignee
British Dyestuffs Corp 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 British Dyestuffs Corp Ltd filed Critical British Dyestuffs Corp Ltd
Priority to GB705724A priority Critical patent/GB232392A/en
Publication of GB232392A publication Critical patent/GB232392A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
    • C07C45/64—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by introduction of functional groups containing oxygen only in singly bound form

Landscapes

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

Abstract

Salicylaldehyde and m-hydroxybenzaldehyde are prepared by reducing crude nitrated benzaldehyde with hydrosulphite and, without boiling off the sulphur dioxide, diazotizing and distilling the diazo product in a current of steam, the m-compound being extracted from the residue and the o-compound from the distillate. In an example benzaldehyde is nitrated at low temperature with nitric and sulphuric acids, the mixture poured on to ice, washed with water and dilute soda, reduced with sodium hydrosulphite, the reduction mixture treated with sulphuric or hydrochloric acid and sodium nitrite and the diazo solution decomposed by dropping into dilute sulphuric acid through which a current of steam is passing. Salicylaldehyde and some anthranil are recovered from the distillate by extraction with a solvent and the aldehyde separated by solution in alkali, filtering and reprecipitation by acid. The m-hydroxybenzaldehyde is separated from the residue in the still by filtering off the tar and extracting with ether. Specification 22398/09 is referred to.
GB705724A 1924-03-19 1924-03-19 Improvements in the manufacture of hydroxy benzaldehydes Expired GB232392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB705724A GB232392A (en) 1924-03-19 1924-03-19 Improvements in the manufacture of hydroxy benzaldehydes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB705724A GB232392A (en) 1924-03-19 1924-03-19 Improvements in the manufacture of hydroxy benzaldehydes

Publications (1)

Publication Number Publication Date
GB232392A true GB232392A (en) 1925-04-23

Family

ID=9825792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB705724A Expired GB232392A (en) 1924-03-19 1924-03-19 Improvements in the manufacture of hydroxy benzaldehydes

Country Status (1)

Country Link
GB (1) GB232392A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111707653A (en) * 2020-05-15 2020-09-25 上海应用技术大学 Method for rapidly detecting sulfur dioxide in tremella on site and sampling paper chip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111707653A (en) * 2020-05-15 2020-09-25 上海应用技术大学 Method for rapidly detecting sulfur dioxide in tremella on site and sampling paper chip

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