GB686045A - Improvements in the production of crotonaldehyde - Google Patents

Improvements in the production of crotonaldehyde

Info

Publication number
GB686045A
GB686045A GB24837/50A GB2483750A GB686045A GB 686045 A GB686045 A GB 686045A GB 24837/50 A GB24837/50 A GB 24837/50A GB 2483750 A GB2483750 A GB 2483750A GB 686045 A GB686045 A GB 686045A
Authority
GB
United Kingdom
Prior art keywords
crotonization
crotonaldehyde
electrolyte solution
aldol
via pipe
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
GB24837/50A
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.)
BASF SE
Original Assignee
BASF SE
Badische Anilin and Sodafabrik AG
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 BASF SE, Badische Anilin and Sodafabrik AG filed Critical BASF SE
Publication of GB686045A publication Critical patent/GB686045A/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
    • C07C45/65—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 splitting-off hydrogen atoms or functional groups; by hydrogenolysis of functional groups
    • C07C45/66—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 splitting-off hydrogen atoms or functional groups; by hydrogenolysis of functional groups by dehydration

Landscapes

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

Abstract

<PICT:0686045/IV (b)/1> Crotonaldehyde is prepared by leading aldol into a hot aqueous electrolyte solution under conditions of incomplete crotonization and distilling off at least part of the crotonaldehyde formed, separating the non-aqueous layer in the electrolyte solution and leading it into a separate hot electrolyte solution under crotonizing conditions while distilling off the crotonaldehyde therefrom. Thus, as shown, aldol is fed via pipe 2 into a tower 1 about two-thirds filled with an aqueous electrolyte solution maintained at crotonization temperature by means of circulation heater 3. Acetaldehyde, water and at least part of the crotonaldehyde formed distil off via pipe 4 and are fractionated to obtain pure crotonaldehyde. Meanwhile, part of the contents of tower 1 flow into a separator 6 where layer formation occurs; the lower layer of spent crotonization liquor is removed at 10 while the upper layer of aldol flows into the second crotonization chamber 8 charged with hot crotonization solution and from which crotonaldehyde distils off. Spent crotonization liquor is removed via pipe 11. The process is preferably continuous. Suitable crotonization solutions contain non-volatile mineral acids or their acid salts, e.g. sulphuric acid, phosphoric acid, sodium bisulphate or mono-sodium phosphate; mixtures of such salts with free acids which have a buffering action and mixtures of alkali phosphates with phosphoric acid may be used. The solution preferably has a pH of about 2 to 6. Suitable operating temperatures are between 60 DEG and 110 DEG C. Reduced, atmo spheric or superatmospheric pressures may be used. An example is given.
GB24837/50A 1949-10-17 1950-10-11 Improvements in the production of crotonaldehyde Expired GB686045A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE686045X 1949-10-17

Publications (1)

Publication Number Publication Date
GB686045A true GB686045A (en) 1953-01-14

Family

ID=6597977

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24837/50A Expired GB686045A (en) 1949-10-17 1950-10-11 Improvements in the production of crotonaldehyde

Country Status (1)

Country Link
GB (1) GB686045A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3468957A (en) * 1967-01-17 1969-09-23 Celanese Corp Process for dehydrating an aldol

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3468957A (en) * 1967-01-17 1969-09-23 Celanese Corp Process for dehydrating an aldol

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