Dibutyl Phthalate → Phthalic Anhydride

HRID 654241

Reaction equation

HRID 654241 reaction equation
C=CC.C1OC1.[C:7]([O:22]CCCC)(=[O:21])[C:8]1[C:9](=[CH:17][CH:18]=[CH:19][CH:20]=1)[C:10]([O:12]CCCC)=[O:11]>C1(C)C(C)=CC=CC=1>[CH2:7]([OH:21])[CH2:8][CH2:9][CH2:10][OH:11].[C:10]1(=[O:12])[O:22][C:7](=[O:21])[C:8]2=[CH:20][CH:19]=[CH:18][CH:17]=[C:9]12

Participants

6

Reactant 3

HCID 3026Dibutyl PhthalateHCID 6354Ethylene OxideHCID 8252Propylene

Product 2

HCID 6811Phthalic AnhydrideHCID 80641,4-Butanediol

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

320 parts of a 40% xylene solution of dihydroxyethylenepropylene copolymer (molecular weight; 8,000, propylene content; 50%, prepared by hydroxyethylating both terminals of the ethylene-propylene copolymer as produced by known living anionic polymerization with ethyleneoxide) and 460 parts of a 40% dibutyl phthalate solution of polyester obtained from 1,4-butanediol and phthalic anhydride (equivalent weight ratio; 41/40, molecular weight; 8,000) were fed into a four-mouthed reaction vessel fitted with a powerful stirrer, a temperature sensor, a condenser and a material charging inlet and stirred for one hour at 100° C. for homogenization. Afterwards, 4.3 parts of hexamethylene diisocyanate was added thereto and stirred for one hour at 120° C., and 0.02 part of dibutyl tin dilaurate was further added thereto and reacted until the NCO content became 0.05 or less (generally, for five hours) to obtain a 40% solvent solution of component (2)(i).

Workup

  1. custom50%, prepared
  2. customas produced

Sources & evidence

ORD record
ord-45beeec7efef45469c6d040426e9f5a4
Source dataset
uspto-grants-1992_07
Patent number
US05130359

Linked notes

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