GB793766A - Preparation of alkylene glycols - Google Patents

Preparation of alkylene glycols

Info

Publication number
GB793766A
GB793766A GB31184/56A GB3118456A GB793766A GB 793766 A GB793766 A GB 793766A GB 31184/56 A GB31184/56 A GB 31184/56A GB 3118456 A GB3118456 A GB 3118456A GB 793766 A GB793766 A GB 793766A
Authority
GB
United Kingdom
Prior art keywords
catalyst
copper
phosphate
mixture
glycols
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
GB31184/56A
Inventor
David Johnston Pye
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Priority to GB31184/56A priority Critical patent/GB793766A/en
Publication of GB793766A publication Critical patent/GB793766A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/09—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis
    • C07C29/10—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of ethers, including cyclic ethers, e.g. oxiranes
    • C07C29/103—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of ethers, including cyclic ethers, e.g. oxiranes of cyclic ethers
    • C07C29/106—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of ethers, including cyclic ethers, e.g. oxiranes of cyclic ethers of oxiranes

Landscapes

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

Abstract

Glycols are obtained from C2-C4 alkylene oxides (having the oxygen atom attached to adjacent carbon atoms) by passing the vapour with more than an equimolar proportion of water over a catalyst comprising a normal calcium phosphate below 500 DEG C. Preferably more than 6 equivalents of water are used, and desirably more than 17 if the reactor has a stationary bed of catalyst. The reaction temperature may be 200-400 DEG C., e.g. 275-325 DEG C. the contact time being 1-25 seconds for a temperature of 250-350 DEG C. when the mixture is passed through a fluid bed of catalyst. The latter should consist preponderantly of tricalcium phosphate, promoted if desired with copper phosphate. A suitable catalyst is composed of Ca3(PO4)2 and CaHPO4 with a mol. ratio CaO/P2O5 of 2.7-2.8 and containing 0.1-1 per cent of copper. The vapour issuing from the catalyst is condensed to give a strong aqueous solution of glycol containing very little polyglycols. Examples are given of the production of ethylene glycol and it is stated that 1:2-propylene glycol and 1:2- and 2:3-butylene glycols may also be obtained from the corresponding alkylene oxides.ALSO:A catalyst for the vapour phase hydration of alkylene oxides to glycols consists essentially of a normal calcium phosphate, promoted if desired with copper. A suitable catalyst is composed of Ca3(PO4)2 and CaHPO4 with a mol. ratio CaO/P2O4 of 2.7-2.8 and containing 0.1-1.0 per cent of copper, e.g. as phosphate. Such a mixture can be obtained by adding phosphoric acid and ammonia (or other alkali) to a solution of calcium and copper chlorides, separating, washing and drying the precipitate. It may if desired be mixed in powdered or granular form with a lubricant, such as graphite, and pressed into tablets, the lubricant then being removed by oxidation. The catalyst may also be made by grinding together an aqueous mixture of calcium and copper phosphates and drying the resultant mixture.
GB31184/56A 1956-10-12 1956-10-12 Preparation of alkylene glycols Expired GB793766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB31184/56A GB793766A (en) 1956-10-12 1956-10-12 Preparation of alkylene glycols

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31184/56A GB793766A (en) 1956-10-12 1956-10-12 Preparation of alkylene glycols

Publications (1)

Publication Number Publication Date
GB793766A true GB793766A (en) 1958-04-23

Family

ID=10319258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31184/56A Expired GB793766A (en) 1956-10-12 1956-10-12 Preparation of alkylene glycols

Country Status (1)

Country Link
GB (1) GB793766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8309771B2 (en) 2008-08-05 2012-11-13 Dow Technology Investments Llc Two-stage, gas phase process for the manufacture of alkylene glycol

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8309771B2 (en) 2008-08-05 2012-11-13 Dow Technology Investments Llc Two-stage, gas phase process for the manufacture of alkylene glycol

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