Method for the complete anaerobic digestion of polymer mixtures

摘要

The present invention relates to a process for complete anaerobic digestion of polymer mixtures of the composition:
a) 25 to 95% by weight of a polyhydroxyalkanoate selected from the group consisting of poly-4-hydroxybutyrate, poly-3-hydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) andb) 5 to 75% by weight of an aliphatic polyester comprising:
i) 65 to 100 mol %, based on components i to ii, of succinic acid or of a succinic acid derivative;ii) 0 to 35 mol %, based on components i to ii, of an aliphatic C5-C36-dicarboxylic acid, of a corresponding acid derivative or of a mixture;iii) 98 to 100 mol %, based on components i to ii, of a C2-C8-alkylenediol or C2-C6-oxyalkylenediol;iv) 0 to 2% by weight, based on the polymer obtainable from components i to iii, of at least one polyfunctional compound comprising at least two isocyanate, isocyanurate, oxazoline or epoxide groups or at least three alcohol or carboxylic acid groups.

主权项

1. A process for disposing of biomass in a biogas plant, the process comprising:
A) collecting or dispensing the biomass into a package, the package prepared from a composition comprising a polymer mixture; B) transporting the package in a waste management vehicle to a biogas plant; and C) fermenting the package anaerobically in a biogas plant to make biogas, wherein the polymer mixture in step A) comprises: (1) a polyhydroxylalkanoate of 25 to 95% by weight; and (2) an aliphatic polyester of 5 to 75% by weight, wherein the polyhydroxylalkanoate of (1) is selected from the group consisting of poly-4-hydroxybutyrate, poly-3-hydroxybutyrate, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), and poly(3-hydroxybutyrate-co-4-hydroxybutyrate, wherein the aliphatic polyester of (2) comprises: (i) a diol/diacid component; and (ii) at least one polyfunctional compound of 0 to 2% by weight, wherein the diacid component in the diol/diacid component of (i) is of 65 to 100 mol % of succinic acid, or a derivative thereof, and 0 to 35 mol % of an aliphatic C5-C36-dicarboxylic acid, or a derivative thereof, or a mixture of the dicarboxylic acid and the derivative, wherein the diol component in the diol/diacid component of (i) is a C2-C8-alkylenediol or C2-C6-oxyalkylenediol, wherein the diol/diacid component of (i) has a diol/diacid molar ratio between 0.98:1 and 1:1, and wherein the at least one polyfunctional compound of (ii) comprises at least two isocyanate, isocyanurate, oxazoline or epoxide groups, or at least three alcohol or carboxylic acid groups.