GB830691A - Manufacture of terephthalic acid-glycol esters suitable for polycondensation - Google Patents

Manufacture of terephthalic acid-glycol esters suitable for polycondensation

Info

Publication number
GB830691A
GB830691A GB11860/56A GB1186056A GB830691A GB 830691 A GB830691 A GB 830691A GB 11860/56 A GB11860/56 A GB 11860/56A GB 1186056 A GB1186056 A GB 1186056A GB 830691 A GB830691 A GB 830691A
Authority
GB
United Kingdom
Prior art keywords
impurities
terephthalic acid
salt solution
salt
glycol
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
GB11860/56A
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.)
ROTTWELLER KUNSTSEIDEFABRIK AG
Original Assignee
ROTTWELLER KUNSTSEIDEFABRIK 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 ROTTWELLER KUNSTSEIDEFABRIK AG filed Critical ROTTWELLER KUNSTSEIDEFABRIK AG
Publication of GB830691A publication Critical patent/GB830691A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation

Landscapes

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

Abstract

The process of the parent Specification for the production of terephthalic acid glycol esters is modified in that the crude reaction product, with or without preliminary purification with hot water, is purified by treatment with a hot salt solution in which the monomeric glycol ester, but not the impurities dissolves, whereupon the salt solution is isolated from the impurities and the monomeric glycol ester is crystallized from the salt solution by cooling. Suitable salt solutions are those of alkali metals or ammonia primary phosphates and chlorides. The purification is preferably conducted continuously with recirculation of the salt mother liquor to the charging vessel and recirculation of the impurities for further leaching out. Details are given of the relative solubility of the bis-glycol and bis-diglycol ester in various salt solutions at 10 DEG and 98 DEG C.
GB11860/56A 1955-04-19 1956-04-18 Manufacture of terephthalic acid-glycol esters suitable for polycondensation Expired GB830691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE830691X 1955-04-19

Publications (1)

Publication Number Publication Date
GB830691A true GB830691A (en) 1960-03-16

Family

ID=6750912

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11860/56A Expired GB830691A (en) 1955-04-19 1956-04-18 Manufacture of terephthalic acid-glycol esters suitable for polycondensation

Country Status (1)

Country Link
GB (1) GB830691A (en)

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