Water → Propylene Glycol

HRID 1645412Notes

Reaction equation

[C:1]([OH:5])(C)([CH3:3])[CH3:2].[OH2:6]>>[CH2:2]=[CH:1][CH3:3].[CH2:2]1[O:5][CH:1]1[CH3:3].[CH2:2]([OH:6])[CH:1]([OH:5])[CH3:3]

Participants

Reactant 2

HCID 962Water

HCID 6386tert-Butanol

Product 3

HCID 1030Propylene Glycol

HCID 6378Propylene Oxide

HCID 8252Propylene

Procedure

The epoxidation step of the process produces a product stream comprising propylene, propylene oxide, propylene glycol, tertiary butyl alcohol, and water. The product stream components are purified by a distillation process comprising three steps. The product stream may contain some residual hydrogen peroxide from the epoxidation reaction, however, if present, the residual hydrogen peroxide will decompose to water during the distillation steps. First, the product stream is distilled to produce a first overhead stream comprising propylene and a first bottoms stream comprising propylene oxide, propylene glycol, tertiary butyl alcohol, and water. In the first distillation, preferably at least 98% of the propylene (more preferably, at least 99.5%) is taken overhead.

Sources & evidence

ORD record: ord-1abfcb04d87d4c029a4660b8482746ac
Source dataset: uspto-grants-2012_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08124797B2

Reaction notes

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