# Commission Implementing Decision (EU) 2017/2117 of 21 November 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of large volume organic chemicals (notified under document C(2017) 7469) (Text with EEA relevance), Division BAT 55:: In order to reduce the amount of organic waste being sent for disposal from the EO and EG plant, BAT is to use a combination of the techniques given below.

Extent: E+W+S+N.I.

Technique
Description
Applicability
a.
Hydrolysis reaction optimisation
Optimisation of the water to EO ratio to both achieve lower co-production of heavier glycols and avoid excessive energy demand for the dewatering of glycols. The optimum ratio depends on the target output of di- and triethylene glycols
Generally applicable
b.
Isolation of by-products at EO plants for use
For EO plants, the concentrated organic fraction obtained after the dewatering of the liquid effluent from EO recovery is distilled to give valuable short-chain glycols and a heavier residue
Only applicable to new plants or major plant upgrades
c.
Isolation of by-products at EG plants for use
For EG plants, the longer chain glycols fraction can either be used as such or further fractionated to yield valuable glycols
Generally applicable

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Source: https://www.legislation.gov.uk/eudn/2017/2117/annex/division/6/division/6.4/division/BAT+55 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-2117/annex/division-6/division-6.4/division-BAT+55
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.