Bio-derived ethylene glycol compositions for polyester bottles
A bio-based diol, polyester bottle technology, applied in acyclic diols or bio-based non, the preferred diol is the field of bio-based diols, which can solve problems such as reducing the transparency of the mixture
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Embodiment 1
[0192] Example 1: Preparation of a C5-enriched liquid sugar stream
[0193] Wheat straw feedstock was used as a starting lignocellulosic feedstock to obtain a C5-rich liquid sugar stream for the production of the various diols disclosed.
[0194] The raw material was subjected to a pre-soaking step for 30 minutes in water at a temperature of 130° C. at a liquid-to-solid ratio of 5:1.
[0195] The pre-soaked lignocellulosic feedstock was subjected to a soaking step at a temperature of 155° C. for 65 minutes, and the soaked feedstock was separated by a press to produce a soaking liquid and a soaked solids stream containing the soaked biomass. The soaked solids stream was subjected to steam explosion at a temperature of 190° C. for 4 minutes to produce a steam exploded stream. Liquid is separated from the steam exploded stream by a press and added to the infusion.
[0196] The infusion was subjected to a solids separation step by means of centrifugation and straining (bag filte...
Embodiment 2
[0204] Example 2: Conversion of C5-enriched sugar streams to polyol mixtures
[0205] A C5-rich liquid sugar stream is converted to a polyol mixture according to a two-step catalytic reaction, both in the presence of hydrogen.
[0206] The C5-rich liquid sugar stream was put into a hydrogenation reactor and brought into contact with a hydrogenation catalyst (2% Ru / C catalyst, Johnson Matthey extruded type 642) and hydrogen at a pressure of 80 bar and a reaction temperature of 110°C .
[0207] The hydrogenation reaction was carried out in continuous mode, wherein a C5-rich liquid sugar stream was continuously introduced into the hydrogenation reactor at a flow rate of 6 l / h, and the hydrogenation mixture was continuously removed from the reactor. Liquid hourly space velocity (LHSV) is about 1.3h -1 , and set the hydrogen flow rate to correspond to 3 mol / mol of H 2 / total sugar ratio value.
[0208] The compositions of the C5-enriched liquid sugar stream and the hydrogenat...
Embodiment 3
[0218] Example 3 - Removal of Water and Heavy Polyols
[0219] The polyol mixture was placed into a 40 liter glass jacketed turbine agitated vacuum batch flash system. The polyol mixture (90% water content) was gradually heated to 55° C. at a pressure of 64 mbar. Under these conditions, fractions were collected (water content 99.7%). Subsequently, the liquid temperature was gradually heated to 66°C and another fraction (99.5% water content) was withdrawn when a decrease in condensate flow was observed until distillate flow became negligible. The water content of the residue at the bottom was reduced to 11.3%, and the composition of the residue on a dry basis was essentially that reported in Table 2.
[0220] The dehydrated polyol mixture is subjected to an evaporation step to separate a mixture comprising low boiling polyols from a mixture comprising high boiling polyols.
[0221] The dehydrated polyol mixture was gradually heated to 120° C. at a pressure of 1 mbar. Under ...
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